Merge remote-tracking branch 'origin/main' into w2p-94060_Issue-1720_MyDSpace-support-entities

config/config.example.yml

@@ -156,9 +156,15 @@ languages:
   - code: tr
     label: Türkçe
     active: true
+  - code: kk
+    label: Қазақ
+    active: true
   - code: bn
     label: বাংলা
     active: true
+  - code: el
+    label: Ελληνικά
+    active: true
 
 # Browse-By Pages
 browseBy:
@@ -168,6 +174,27 @@ browseBy:
   fiveYearLimit: 30
   # The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
   defaultLowerLimit: 1900
+  # If true, thumbnail images for items will be added to BOTH search and browse result lists.
+  showThumbnails: true
+  # The number of entries in a paginated browse results list.
+  # Rounded to the nearest size in the list of selectable sizes on the
+  # settings menu.
+  pageSize: 20
+
+communityList:
+  # No. of communities to list per expansion (show more)
+  pageSize: 20
+
+homePage:
+  recentSubmissions:
+    # The number of item showing in recent submission components
+    pageSize: 5
+    # Sort record of recent submission
+    sortField: 'dc.date.accessioned'
+  topLevelCommunityList:
+    # No. of communities to list per page on the home page
+    # This will always round to the nearest number from the list of page sizes. e.g. if you set it to 7 it'll use 10
+    pageSize: 5
 
 # Item Config
 item:
@@ -243,7 +270,7 @@ themes:
 
 # The default bundles that should always be displayed as suggestions when you upload a new bundle
 bundle:
-  - standardBundles: [ ORIGINAL, THUMBNAIL, LICENSE ]
+  standardBundles: [ ORIGINAL, THUMBNAIL, LICENSE ]
 
 # Whether to enable media viewer for image and/or video Bitstreams (i.e. Bitstreams whose MIME type starts with 'image' or 'video').
 # For images, this enables a gallery viewer where you can zoom or page through images.

cypress/.gitignore

@@ -1,2 +1,3 @@
 screenshots/
 videos/
+downloads/

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dspace-angular",
-  "version": "0.0.0",
+  "version": "7.4.0-next",
   "scripts": {
     "ng": "ng",
     "config:watch": "nodemon",
@@ -10,7 +10,7 @@
     "start:prod": "yarn run build:prod && cross-env NODE_ENV=production yarn run serve:ssr",
     "start:mirador:prod": "yarn run build:mirador && yarn run start:prod",
     "preserve": "yarn base-href",
-    "serve": "ng serve --configuration development",
+    "serve": "ts-node --project ./tsconfig.ts-node.json scripts/serve.ts",
     "serve:ssr": "node dist/server/main",
     "analyze": "webpack-bundle-analyzer dist/browser/stats.json",
     "build": "ng build --configuration development",

scripts/serve.ts

@@ -10,6 +10,6 @@ const appConfig: AppConfig = buildAppConfig();
  * Any CLI arguments given to this script are patched through to `ng serve` as well.
  */
 child.spawn(
-  `ng serve --host ${appConfig.ui.host} --port ${appConfig.ui.port} --serve-path ${appConfig.ui.nameSpace} --ssl ${appConfig.ui.ssl} ${process.argv.slice(2).join(' ')}`,
+  `ng serve --host ${appConfig.ui.host} --port ${appConfig.ui.port} --serve-path ${appConfig.ui.nameSpace} --ssl ${appConfig.ui.ssl} ${process.argv.slice(2).join(' ')} --configuration development`,
   { stdio: 'inherit', shell: true }
 );

scripts/test-rest.ts

@@ -22,7 +22,13 @@ console.log(`...Testing connection to REST API at ${restUrl}...\n`);
 if (appConfig.rest.ssl) {
     const req = https.request(restUrl, (res) => {
         console.log(`RESPONSE: ${res.statusCode} ${res.statusMessage} \n`);
-        res.on('data', (data) => {
+        // We will keep reading data until the 'end' event fires.
+        // This ensures we don't just read the first chunk.
+        let data = '';
+        res.on('data', (chunk) => {
+            data += chunk;
+        });
+        res.on('end', () => {
             checkJSONResponse(data);
         });
     });
@@ -35,7 +41,13 @@ if (appConfig.rest.ssl) {
 } else {
     const req = http.request(restUrl, (res) => {
         console.log(`RESPONSE: ${res.statusCode} ${res.statusMessage} \n`);
-        res.on('data', (data) => {
+        // We will keep reading data until the 'end' event fires.
+        // This ensures we don't just read the first chunk.
+        let data = '';
+        res.on('data', (chunk) => {
+            data += chunk;
+        });
+        res.on('end', () => {
             checkJSONResponse(data);
         });
     });

server.ts

@@ -48,6 +48,7 @@ import { ServerAppModule } from './src/main.server';
 import { buildAppConfig } from './src/config/config.server';
 import { APP_CONFIG, AppConfig } from './src/config/app-config.interface';
 import { extendEnvironmentWithAppConfig } from './src/config/config.util';
+import { logStartupMessage } from './startup-message';
 
 /*
  * Set path for the browser application's dist folder
@@ -281,6 +282,8 @@ function run() {
 }
 
 function start() {
+  logStartupMessage(environment);
+
   /*
   * If SSL is enabled
   * - Read credentials from configuration files

src/app/access-control/epeople-registry/eperson-form/eperson-form.component.spec.ts

@@ -177,7 +177,7 @@ describe('EPersonFormComponent', () => {
 
     });
     groupsDataService = jasmine.createSpyObj('groupsDataService', {
-      findAllByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
+      findListByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
       getGroupRegistryRouterLink: ''
     });
 

src/app/access-control/epeople-registry/eperson-form/eperson-form.component.ts

@@ -265,7 +265,7 @@ export class EPersonFormComponent implements OnInit, OnDestroy {
       this.formGroup = this.formBuilderService.createFormGroup(this.formModel);
       this.subs.push(this.epersonService.getActiveEPerson().subscribe((eperson: EPerson) => {
         if (eperson != null) {
-          this.groups = this.groupsDataService.findAllByHref(eperson._links.groups.href, {
+          this.groups = this.groupsDataService.findListByHref(eperson._links.groups.href, {
             currentPage: 1,
             elementsPerPage: this.config.pageSize
           });
@@ -297,7 +297,7 @@ export class EPersonFormComponent implements OnInit, OnDestroy {
         }),
         switchMap(([eperson, findListOptions]) => {
           if (eperson != null) {
-            return this.groupsDataService.findAllByHref(eperson._links.groups.href, findListOptions, true, true, followLink('object'));
+            return this.groupsDataService.findListByHref(eperson._links.groups.href, findListOptions, true, true, followLink('object'));
           }
           return observableOf(undefined);
         })
@@ -554,7 +554,7 @@ export class EPersonFormComponent implements OnInit, OnDestroy {
    */
   private updateGroups(options) {
     this.subs.push(this.epersonService.getActiveEPerson().subscribe((eperson: EPerson) => {
-      this.groups = this.groupsDataService.findAllByHref(eperson._links.groups.href, options);
+      this.groups = this.groupsDataService.findListByHref(eperson._links.groups.href, options);
     }));
   }
 }

src/app/access-control/group-registry/group-form/members-list/members-list.component.spec.ts

@@ -53,7 +53,7 @@ describe('MembersListComponent', () => {
       activeGroup: activeGroup,
       epersonMembers: epersonMembers,
       subgroupMembers: subgroupMembers,
-      findAllByHref(href: string): Observable<RemoteData<PaginatedList<EPerson>>> {
+      findListByHref(href: string): Observable<RemoteData<PaginatedList<EPerson>>> {
         return createSuccessfulRemoteDataObject$(buildPaginatedList<EPerson>(new PageInfo(), groupsDataServiceStub.getEPersonMembers()));
       },
       searchByScope(scope: string, query: string): Observable<RemoteData<PaginatedList<EPerson>>> {

src/app/access-control/group-registry/group-form/members-list/members-list.component.ts

@@ -10,7 +10,7 @@ import {
   combineLatest as observableCombineLatest,
   ObservedValueOf,
 } from 'rxjs';
-import { map, mergeMap, switchMap, take } from 'rxjs/operators';
+import { defaultIfEmpty, map, mergeMap, switchMap, take } from 'rxjs/operators';
 import {buildPaginatedList, PaginatedList} from '../../../../core/data/paginated-list.model';
 import { RemoteData } from '../../../../core/data/remote-data';
 import { EPersonDataService } from '../../../../core/eperson/eperson-data.service';
@@ -129,7 +129,7 @@ export class MembersListComponent implements OnInit, OnDestroy {
     this.subs.set(SubKey.MembersDTO,
       this.paginationService.getCurrentPagination(this.config.id, this.config).pipe(
         switchMap((currentPagination) => {
-          return this.ePersonDataService.findAllByHref(this.groupBeingEdited._links.epersons.href, {
+          return this.ePersonDataService.findListByHref(this.groupBeingEdited._links.epersons.href, {
               currentPage: currentPagination.currentPage,
               elementsPerPage: currentPagination.pageSize
             }
@@ -144,7 +144,7 @@ export class MembersListComponent implements OnInit, OnDestroy {
         }
       }),
       switchMap((epersonListRD: RemoteData<PaginatedList<EPerson>>) => {
-        const dtos$ = observableCombineLatest(...epersonListRD.payload.page.map((member: EPerson) => {
+        const dtos$ = observableCombineLatest([...epersonListRD.payload.page.map((member: EPerson) => {
           const dto$: Observable<EpersonDtoModel> = observableCombineLatest(
             this.isMemberOfGroup(member), (isMember: ObservedValueOf<Observable<boolean>>) => {
               const epersonDtoModel: EpersonDtoModel = new EpersonDtoModel();
@@ -153,8 +153,8 @@ export class MembersListComponent implements OnInit, OnDestroy {
               return epersonDtoModel;
             });
           return dto$;
-        }));
-        return dtos$.pipe(map((dtos: EpersonDtoModel[]) => {
+        })]);
+        return dtos$.pipe(defaultIfEmpty([]), map((dtos: EpersonDtoModel[]) => {
           return buildPaginatedList(epersonListRD.payload.pageInfo, dtos);
         }));
       }))
@@ -171,10 +171,10 @@ export class MembersListComponent implements OnInit, OnDestroy {
     return this.groupDataService.getActiveGroup().pipe(take(1),
       mergeMap((group: Group) => {
         if (group != null) {
-          return this.ePersonDataService.findAllByHref(group._links.epersons.href, {
+          return this.ePersonDataService.findListByHref(group._links.epersons.href, {
             currentPage: 1,
             elementsPerPage: 9999
-          }, false)
+          })
             .pipe(
               getFirstSucceededRemoteData(),
               getRemoteDataPayload(),
@@ -274,7 +274,7 @@ export class MembersListComponent implements OnInit, OnDestroy {
           }
         }),
         switchMap((epersonListRD: RemoteData<PaginatedList<EPerson>>) => {
-          const dtos$ = observableCombineLatest(...epersonListRD.payload.page.map((member: EPerson) => {
+          const dtos$ = observableCombineLatest([...epersonListRD.payload.page.map((member: EPerson) => {
             const dto$: Observable<EpersonDtoModel> = observableCombineLatest(
               this.isMemberOfGroup(member), (isMember: ObservedValueOf<Observable<boolean>>) => {
                 const epersonDtoModel: EpersonDtoModel = new EpersonDtoModel();
@@ -283,8 +283,8 @@ export class MembersListComponent implements OnInit, OnDestroy {
                 return epersonDtoModel;
               });
             return dto$;
-          }));
-          return dtos$.pipe(map((dtos: EpersonDtoModel[]) => {
+          })]);
+          return dtos$.pipe(defaultIfEmpty([]), map((dtos: EpersonDtoModel[]) => {
             return buildPaginatedList(epersonListRD.payload.pageInfo, dtos);
           }));
         }))

src/app/access-control/group-registry/group-form/subgroup-list/subgroups-list.component.spec.ts

@@ -65,7 +65,7 @@ describe('SubgroupsListComponent', () => {
       getSubgroups(): Group {
         return this.activeGroup;
       },
-      findAllByHref(href: string): Observable<RemoteData<PaginatedList<Group>>> {
+      findListByHref(href: string): Observable<RemoteData<PaginatedList<Group>>> {
         return this.subgroups$.pipe(
           map((currentGroups: Group[]) => {
             return createSuccessfulRemoteDataObject(buildPaginatedList<Group>(new PageInfo(), currentGroups));

src/app/access-control/group-registry/group-form/subgroup-list/subgroups-list.component.ts

@@ -115,7 +115,7 @@ export class SubgroupsListComponent implements OnInit, OnDestroy {
     this.subs.set(
       SubKey.Members,
       this.paginationService.getCurrentPagination(this.config.id, this.config).pipe(
-        switchMap((config) => this.groupDataService.findAllByHref(this.groupBeingEdited._links.subgroups.href, {
+        switchMap((config) => this.groupDataService.findListByHref(this.groupBeingEdited._links.subgroups.href, {
             currentPage: config.currentPage,
             elementsPerPage: config.pageSize
           },
@@ -139,7 +139,7 @@ export class SubgroupsListComponent implements OnInit, OnDestroy {
           if (activeGroup.uuid === possibleSubgroup.uuid) {
             return observableOf(false);
           } else {
-            return this.groupDataService.findAllByHref(activeGroup._links.subgroups.href, {
+            return this.groupDataService.findListByHref(activeGroup._links.subgroups.href, {
               currentPage: 1,
               elementsPerPage: 9999
             })

src/app/access-control/group-registry/groups-registry.component.spec.ts

@@ -69,7 +69,7 @@ describe('GroupRegistryComponent', () => {
     mockGroups = [GroupMock, GroupMock2];
     mockEPeople = [EPersonMock, EPersonMock2];
     ePersonDataServiceStub = {
-      findAllByHref(href: string): Observable<RemoteData<PaginatedList<EPerson>>> {
+      findListByHref(href: string): Observable<RemoteData<PaginatedList<EPerson>>> {
         switch (href) {
           case 'https://dspace.4science.it/dspace-spring-rest/api/eperson/groups/testgroupid2/epersons':
             return createSuccessfulRemoteDataObject$(buildPaginatedList(new PageInfo({
@@ -97,7 +97,7 @@ describe('GroupRegistryComponent', () => {
     };
     groupsDataServiceStub = {
       allGroups: mockGroups,
-      findAllByHref(href: string): Observable<RemoteData<PaginatedList<Group>>> {
+      findListByHref(href: string): Observable<RemoteData<PaginatedList<Group>>> {
         switch (href) {
           case 'https://dspace.4science.it/dspace-spring-rest/api/eperson/groups/testgroupid2/groups':
             return createSuccessfulRemoteDataObject$(buildPaginatedList(new PageInfo({

src/app/access-control/group-registry/groups-registry.component.ts

@@ -213,7 +213,7 @@ export class GroupsRegistryComponent implements OnInit, OnDestroy {
    * @param group
    */
   getMembers(group: Group): Observable<RemoteData<PaginatedList<EPerson>>> {
-    return this.ePersonDataService.findAllByHref(group._links.epersons.href).pipe(getFirstSucceededRemoteData());
+    return this.ePersonDataService.findListByHref(group._links.epersons.href).pipe(getFirstSucceededRemoteData());
   }
 
   /**
@@ -221,7 +221,7 @@ export class GroupsRegistryComponent implements OnInit, OnDestroy {
    * @param group
    */
   getSubgroups(group: Group): Observable<RemoteData<PaginatedList<Group>>> {
-    return this.groupService.findAllByHref(group._links.subgroups.href).pipe(getFirstSucceededRemoteData());
+    return this.groupService.findListByHref(group._links.subgroups.href).pipe(getFirstSucceededRemoteData());
   }
 
   /**

src/app/admin/admin-search-page/admin-search-results/admin-search-result-grid-element/collection-search-result/collection-admin-search-result-grid-element.component.spec.ts

@@ -14,6 +14,14 @@ import { By } from '@angular/platform-browser';
 import { RouterTestingModule } from '@angular/router/testing';
 import { getCollectionEditRoute } from '../../../../../collection-page/collection-page-routing-paths';
 import { LinkService } from '../../../../../core/cache/builders/link.service';
+import { AuthService } from '../../../../../core/auth/auth.service';
+import { AuthServiceStub } from '../../../../../shared/testing/auth-service.stub';
+import { FileService } from '../../../../../core/shared/file.service';
+import { FileServiceStub } from '../../../../../shared/testing/file-service.stub';
+import { AuthorizationDataService } from '../../../../../core/data/feature-authorization/authorization-data.service';
+import { AuthorizationDataServiceStub } from '../../../../../shared/testing/authorization-service.stub';
+import { ThemeService } from '../../../../../shared/theme-support/theme.service';
+import { getMockThemeService } from '../../../../../shared/mocks/theme-service.mock';
 
 describe('CollectionAdminSearchResultGridElementComponent', () => {
   let component: CollectionAdminSearchResultGridElementComponent;
@@ -45,7 +53,11 @@ describe('CollectionAdminSearchResultGridElementComponent', () => {
       providers: [
         { provide: TruncatableService, useValue: mockTruncatableService },
         { provide: BitstreamDataService, useValue: {} },
-        { provide: LinkService, useValue: linkService }
+        { provide: LinkService, useValue: linkService },
+        { provide: AuthService, useClass: AuthServiceStub },
+        { provide: FileService, useClass: FileServiceStub },
+        { provide: AuthorizationDataService, useClass: AuthorizationDataServiceStub },
+        { provide: ThemeService, useValue: getMockThemeService() },
       ]
     })
       .compileComponents();

src/app/admin/admin-search-page/admin-search-results/admin-search-result-grid-element/community-search-result/community-admin-search-result-grid-element.component.spec.ts

@@ -16,6 +16,14 @@ import { CommunitySearchResult } from '../../../../../shared/object-collection/s
 import { Community } from '../../../../../core/shared/community.model';
 import { getCommunityEditRoute } from '../../../../../community-page/community-page-routing-paths';
 import { LinkService } from '../../../../../core/cache/builders/link.service';
+import { AuthService } from '../../../../../core/auth/auth.service';
+import { AuthServiceStub } from '../../../../../shared/testing/auth-service.stub';
+import { FileService } from '../../../../../core/shared/file.service';
+import { FileServiceStub } from '../../../../../shared/testing/file-service.stub';
+import { AuthorizationDataService } from '../../../../../core/data/feature-authorization/authorization-data.service';
+import { AuthorizationDataServiceStub } from '../../../../../shared/testing/authorization-service.stub';
+import { ThemeService } from '../../../../../shared/theme-support/theme.service';
+import { getMockThemeService } from '../../../../../shared/mocks/theme-service.mock';
 
 describe('CommunityAdminSearchResultGridElementComponent', () => {
   let component: CommunityAdminSearchResultGridElementComponent;
@@ -47,7 +55,11 @@ describe('CommunityAdminSearchResultGridElementComponent', () => {
       providers: [
         { provide: TruncatableService, useValue: mockTruncatableService },
         { provide: BitstreamDataService, useValue: {} },
-        { provide: LinkService, useValue: linkService }
+        { provide: LinkService, useValue: linkService },
+        { provide: AuthService, useClass: AuthServiceStub },
+        { provide: FileService, useClass: FileServiceStub },
+        { provide: AuthorizationDataService, useClass: AuthorizationDataServiceStub },
+        { provide: ThemeService, useValue: getMockThemeService() },
       ],
       schemas: [NO_ERRORS_SCHEMA]
     })

src/app/admin/admin-search-page/admin-search-results/admin-search-result-grid-element/item-search-result/item-admin-search-result-grid-element.component.spec.ts

@@ -20,6 +20,12 @@ import { getMockThemeService } from '../../../../../shared/mocks/theme-service.m
 import { ThemeService } from '../../../../../shared/theme-support/theme.service';
 import { AccessStatusDataService } from '../../../../../core/data/access-status-data.service';
 import { AccessStatusObject } from '../../../../../shared/object-list/access-status-badge/access-status.model';
+import { AuthService } from '../../../../../core/auth/auth.service';
+import { AuthServiceStub } from '../../../../../shared/testing/auth-service.stub';
+import { FileService } from '../../../../../core/shared/file.service';
+import { FileServiceStub } from '../../../../../shared/testing/file-service.stub';
+import { AuthorizationDataService } from '../../../../../core/data/feature-authorization/authorization-data.service';
+import { AuthorizationDataServiceStub } from '../../../../../shared/testing/authorization-service.stub';
 
 describe('ItemAdminSearchResultGridElementComponent', () => {
   let component: ItemAdminSearchResultGridElementComponent;
@@ -64,6 +70,9 @@ describe('ItemAdminSearchResultGridElementComponent', () => {
           { provide: BitstreamDataService, useValue: mockBitstreamDataService },
           { provide: ThemeService, useValue: mockThemeService },
           { provide: AccessStatusDataService, useValue: mockAccessStatusDataService },
+          { provide: AuthService, useClass: AuthServiceStub },
+          { provide: FileService, useClass: FileServiceStub },
+          { provide: AuthorizationDataService, useClass: AuthorizationDataServiceStub },
         ],
         schemas: [NO_ERRORS_SCHEMA]
       })

src/app/admin/admin-search-page/admin-search-results/admin-search-result-list-element/collection-search-result/collection-admin-search-result-list-element.component.spec.ts

@@ -13,6 +13,8 @@ import { RouterTestingModule } from '@angular/router/testing';
 import { getCollectionEditRoute } from '../../../../../collection-page/collection-page-routing-paths';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
 import { DSONameServiceMock } from '../../../../../shared/mocks/dso-name.service.mock';
+import { APP_CONFIG } from '../../../../../../config/app-config.interface';
+import { environment } from '../../../../../../environments/environment';
 
 describe('CollectionAdminSearchResultListElementComponent', () => {
   let component: CollectionAdminSearchResultListElementComponent;
@@ -36,7 +38,8 @@ describe('CollectionAdminSearchResultListElementComponent', () => {
       ],
       declarations: [CollectionAdminSearchResultListElementComponent],
       providers: [{ provide: TruncatableService, useValue: {} },
-        { provide: DSONameService, useClass: DSONameServiceMock }],
+        { provide: DSONameService, useClass: DSONameServiceMock },
+        { provide: APP_CONFIG, useValue: environment }],
       schemas: [NO_ERRORS_SCHEMA]
     })
       .compileComponents();

src/app/admin/admin-search-page/admin-search-results/admin-search-result-list-element/community-search-result/community-admin-search-result-list-element.component.spec.ts

@@ -13,6 +13,8 @@ import { Community } from '../../../../../core/shared/community.model';
 import { getCommunityEditRoute } from '../../../../../community-page/community-page-routing-paths';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
 import { DSONameServiceMock } from '../../../../../shared/mocks/dso-name.service.mock';
+import { APP_CONFIG } from '../../../../../../config/app-config.interface';
+import { environment } from '../../../../../../environments/environment';
 
 describe('CommunityAdminSearchResultListElementComponent', () => {
   let component: CommunityAdminSearchResultListElementComponent;
@@ -36,7 +38,8 @@ describe('CommunityAdminSearchResultListElementComponent', () => {
       ],
       declarations: [CommunityAdminSearchResultListElementComponent],
       providers: [{ provide: TruncatableService, useValue: {} },
-        { provide: DSONameService, useClass: DSONameServiceMock }],
+        { provide: DSONameService, useClass: DSONameServiceMock },
+        { provide: APP_CONFIG, useValue: environment }],
       schemas: [NO_ERRORS_SCHEMA]
     })
       .compileComponents();

src/app/admin/admin-search-page/admin-search-results/admin-search-result-list-element/item-search-result/item-admin-search-result-list-element.component.spec.ts

@@ -10,6 +10,8 @@ import { ItemAdminSearchResultListElementComponent } from './item-admin-search-r
 import { Item } from '../../../../../core/shared/item.model';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
 import { DSONameServiceMock } from '../../../../../shared/mocks/dso-name.service.mock';
+import { APP_CONFIG } from '../../../../../../config/app-config.interface';
+import { environment } from '../../../../../../environments/environment';
 
 describe('ItemAdminSearchResultListElementComponent', () => {
   let component: ItemAdminSearchResultListElementComponent;
@@ -33,7 +35,8 @@ describe('ItemAdminSearchResultListElementComponent', () => {
       ],
       declarations: [ItemAdminSearchResultListElementComponent],
       providers: [{ provide: TruncatableService, useValue: {} },
-        { provide: DSONameService, useClass: DSONameServiceMock }],
+        { provide: DSONameService, useClass: DSONameServiceMock },
+        { provide: APP_CONFIG, useValue: environment }],
       schemas: [NO_ERRORS_SCHEMA]
     })
       .compileComponents();

src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.spec.ts

@@ -18,6 +18,8 @@ import { createSuccessfulRemoteDataObject$ } from '../../../../../shared/remote-
 import { getMockLinkService } from '../../../../../shared/mocks/link-service.mock';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
 import { DSONameServiceMock } from '../../../../../shared/mocks/dso-name.service.mock';
+import { APP_CONFIG } from '../../../../../../config/app-config.interface';
+import { environment } from '../../../../../../environments/environment';
 
 describe('WorkflowItemAdminWorkflowListElementComponent', () => {
   let component: WorkflowItemSearchResultAdminWorkflowListElementComponent;
@@ -51,7 +53,8 @@ describe('WorkflowItemAdminWorkflowListElementComponent', () => {
         providers: [
           { provide: TruncatableService, useValue: mockTruncatableService },
           { provide: LinkService, useValue: linkService },
-          { provide: DSONameService, useClass: DSONameServiceMock }
+          { provide: DSONameService, useClass: DSONameServiceMock },
+          { provide: APP_CONFIG, useValue: environment }
         ],
         schemas: [NO_ERRORS_SCHEMA]
       })

src/app/admin/admin-workflow-page/admin-workflow-search-results/admin-workflow-search-result-list-element/workflow-item/workflow-item-search-result-admin-workflow-list-element.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, Inject, OnInit } from '@angular/core';
 import { ViewMode } from '../../../../../core/shared/view-mode.model';
 import { listableObjectComponent } from '../../../../../shared/object-collection/shared/listable-object/listable-object.decorator';
 import { Context } from '../../../../../core/shared/context.model';
@@ -13,6 +13,7 @@ import { SearchResultListElementComponent } from '../../../../../shared/object-l
 import { TruncatableService } from '../../../../../shared/truncatable/truncatable.service';
 import { WorkflowItemSearchResult } from '../../../../../shared/object-collection/shared/workflow-item-search-result.model';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
+import { APP_CONFIG, AppConfig } from '../../../../../../config/app-config.interface';
 
 @listableObjectComponent(WorkflowItemSearchResult, ViewMode.ListElement, Context.AdminWorkflowSearch)
 @Component({
@@ -32,9 +33,10 @@ export class WorkflowItemSearchResultAdminWorkflowListElementComponent extends S
 
   constructor(private linkService: LinkService,
               protected truncatableService: TruncatableService,
-              protected dsoNameService: DSONameService
+              protected dsoNameService: DSONameService,
+              @Inject(APP_CONFIG) protected appConfig: AppConfig
   ) {
-    super(truncatableService, dsoNameService);
+    super(truncatableService, dsoNameService, appConfig);
   }
 
   /**

src/app/browse-by/browse-by-date-page/browse-by-date-page.component.spec.ts

@@ -18,11 +18,10 @@ import { BrowseEntrySearchOptions } from '../../core/browse/browse-entry-search-
 import { toRemoteData } from '../browse-by-metadata-page/browse-by-metadata-page.component.spec';
 import { VarDirective } from '../../shared/utils/var.directive';
 import { createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.utils';
-import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
-import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { PaginationServiceStub } from '../../shared/testing/pagination-service.stub';
-import { FindListOptions } from '../../core/data/find-list-options.model';
+import { APP_CONFIG } from '../../../config/app-config.interface';
+import { environment } from '../../../environments/environment';
 
 describe('BrowseByDatePageComponent', () => {
   let comp: BrowseByDatePageComponent;
@@ -83,7 +82,8 @@ describe('BrowseByDatePageComponent', () => {
         { provide: DSpaceObjectDataService, useValue: mockDsoService },
         { provide: Router, useValue: new RouterMock() },
         { provide: PaginationService, useValue: paginationService },
-        { provide: ChangeDetectorRef, useValue: mockCdRef }
+        { provide: ChangeDetectorRef, useValue: mockCdRef },
+        { provide: APP_CONFIG, useValue: environment }
       ],
       schemas: [NO_ERRORS_SCHEMA]
     }).compileComponents();

src/app/browse-by/browse-by-date-page/browse-by-date-page.component.ts

@@ -1,9 +1,8 @@
-import { ChangeDetectorRef, Component } from '@angular/core';
+import { ChangeDetectorRef, Component, Inject } from '@angular/core';
 import {
   BrowseByMetadataPageComponent,
-  browseParamsToOptions
+  browseParamsToOptions, getBrowseSearchOptions
 } from '../browse-by-metadata-page/browse-by-metadata-page.component';
-import { BrowseEntrySearchOptions } from '../../core/browse/browse-entry-search-options.model';
 import { combineLatest as observableCombineLatest } from 'rxjs';
 import { RemoteData } from '../../core/data/remote-data';
 import { Item } from '../../core/shared/item.model';
@@ -13,12 +12,12 @@ import { BrowseService } from '../../core/browse/browse.service';
 import { DSpaceObjectDataService } from '../../core/data/dspace-object-data.service';
 import { StartsWithType } from '../../shared/starts-with/starts-with-decorator';
 import { BrowseByDataType, rendersBrowseBy } from '../browse-by-switcher/browse-by-decorator';
-import { environment } from '../../../environments/environment';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { map } from 'rxjs/operators';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
 import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
 import { isValidDate } from '../../shared/date.util';
+import { AppConfig, APP_CONFIG } from '../../../config/app-config.interface';
 
 @Component({
   selector: 'ds-browse-by-date-page',
@@ -43,14 +42,16 @@ export class BrowseByDatePageComponent extends BrowseByMetadataPageComponent {
                      protected dsoService: DSpaceObjectDataService,
                      protected router: Router,
                      protected paginationService: PaginationService,
-                     protected cdRef: ChangeDetectorRef) {
-    super(route, browseService, dsoService, paginationService, router);
+                     protected cdRef: ChangeDetectorRef,
+                     @Inject(APP_CONFIG) public appConfig: AppConfig) {
+    super(route, browseService, dsoService, paginationService, router, appConfig);
   }
 
   ngOnInit(): void {
     const sortConfig = new SortOptions('default', SortDirection.ASC);
     this.startsWithType = StartsWithType.date;
-    this.updatePage(new BrowseEntrySearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig));
+    // include the thumbnail configuration in browse search options
+    this.updatePage(getBrowseSearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig, this.fetchThumbnails));
     this.currentPagination$ = this.paginationService.getCurrentPagination(this.paginationConfig.id, this.paginationConfig);
     this.currentSort$ = this.paginationService.getCurrentSort(this.paginationConfig.id, sortConfig);
     this.subs.push(
@@ -63,7 +64,7 @@ export class BrowseByDatePageComponent extends BrowseByMetadataPageComponent {
         const metadataKeys = params.browseDefinition ? params.browseDefinition.metadataKeys : this.defaultMetadataKeys;
         this.browseId = params.id || this.defaultBrowseId;
         this.startsWith = +params.startsWith || params.startsWith;
-        const searchOptions = browseParamsToOptions(params, currentPage, currentSort, this.browseId);
+        const searchOptions = browseParamsToOptions(params, currentPage, currentSort, this.browseId, this.fetchThumbnails);
         this.updatePageWithItems(searchOptions, this.value, undefined);
         this.updateParent(params.scope);
         this.updateStartsWithOptions(this.browseId, metadataKeys, params.scope);
@@ -83,7 +84,7 @@ export class BrowseByDatePageComponent extends BrowseByMetadataPageComponent {
   updateStartsWithOptions(definition: string, metadataKeys: string[], scope?: string) {
     this.subs.push(
       this.browseService.getFirstItemFor(definition, scope).subscribe((firstItemRD: RemoteData<Item>) => {
-        let lowerLimit = environment.browseBy.defaultLowerLimit;
+        let lowerLimit = this.appConfig.browseBy.defaultLowerLimit;
         if (hasValue(firstItemRD.payload)) {
           const date = firstItemRD.payload.firstMetadataValue(metadataKeys);
           if (isNotEmpty(date) && isValidDate(date)) {
@@ -94,8 +95,8 @@ export class BrowseByDatePageComponent extends BrowseByMetadataPageComponent {
         }
         const options = [];
         const currentYear = new Date().getUTCFullYear();
-        const oneYearBreak = Math.floor((currentYear - environment.browseBy.oneYearLimit) / 5) * 5;
-        const fiveYearBreak = Math.floor((currentYear - environment.browseBy.fiveYearLimit) / 10) * 10;
+        const oneYearBreak = Math.floor((currentYear - this.appConfig.browseBy.oneYearLimit) / 5) * 5;
+        const fiveYearBreak = Math.floor((currentYear - this.appConfig.browseBy.fiveYearLimit) / 10) * 10;
         if (lowerLimit <= fiveYearBreak) {
           lowerLimit -= 10;
         } else if (lowerLimit <= oneYearBreak) {

src/app/browse-by/browse-by-metadata-page/browse-by-metadata-page.component.spec.ts

@@ -1,4 +1,8 @@
-import { BrowseByMetadataPageComponent, browseParamsToOptions } from './browse-by-metadata-page.component';
+import {
+  BrowseByMetadataPageComponent,
+  browseParamsToOptions,
+  getBrowseSearchOptions
+} from './browse-by-metadata-page.component';
 import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 import { BrowseService } from '../../core/browse/browse.service';
 import { CommonModule } from '@angular/common';
@@ -14,7 +18,7 @@ import { RemoteData } from '../../core/data/remote-data';
 import { buildPaginatedList, PaginatedList } from '../../core/data/paginated-list.model';
 import { PageInfo } from '../../core/shared/page-info.model';
 import { BrowseEntrySearchOptions } from '../../core/browse/browse-entry-search-options.model';
-import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { SortDirection } from '../../core/cache/models/sort-options.model';
 import { Item } from '../../core/shared/item.model';
 import { DSpaceObjectDataService } from '../../core/data/dspace-object-data.service';
 import { Community } from '../../core/shared/community.model';
@@ -25,6 +29,7 @@ import { createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.util
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
 import { PaginationServiceStub } from '../../shared/testing/pagination-service.stub';
+import { APP_CONFIG } from '../../../config/app-config.interface';
 
 describe('BrowseByMetadataPageComponent', () => {
   let comp: BrowseByMetadataPageComponent;
@@ -43,6 +48,13 @@ describe('BrowseByMetadataPageComponent', () => {
     ]
   });
 
+  const environmentMock = {
+    browseBy: {
+      showThumbnails: true,
+      pageSize: 10
+    }
+  };
+
   const mockEntries = [
     {
       type: BrowseEntry.type,
@@ -97,7 +109,8 @@ describe('BrowseByMetadataPageComponent', () => {
         { provide: BrowseService, useValue: mockBrowseService },
         { provide: DSpaceObjectDataService, useValue: mockDsoService },
         { provide: PaginationService, useValue: paginationService },
-        { provide: Router, useValue: new RouterMock() }
+        { provide: Router, useValue: new RouterMock() },
+        { provide: APP_CONFIG, useValue: environmentMock }
       ],
       schemas: [NO_ERRORS_SCHEMA]
     }).compileComponents();
@@ -118,6 +131,10 @@ describe('BrowseByMetadataPageComponent', () => {
     expect(comp.items$).toBeUndefined();
   });
 
+  it('should set embed thumbnail property to true', () => {
+    expect(comp.fetchThumbnails).toBeTrue();
+  });
+
   describe('when a value is provided', () => {
     beforeEach(() => {
       const paramsWithValue = {
@@ -145,14 +162,14 @@ describe('BrowseByMetadataPageComponent', () => {
       };
       const paginationOptions = Object.assign(new PaginationComponentOptions(), {
         currentPage: 5,
-        pageSize: 10,
+        pageSize: comp.appConfig.browseBy.pageSize,
       });
       const sortOptions = {
         direction: SortDirection.ASC,
         field: 'fake-field',
       };
 
-      result = browseParamsToOptions(paramsScope, paginationOptions, sortOptions, 'author');
+      result = browseParamsToOptions(paramsScope, paginationOptions, sortOptions, 'author', comp.fetchThumbnails);
     });
 
     it('should return BrowseEntrySearchOptions with the correct properties', () => {
@@ -163,6 +180,36 @@ describe('BrowseByMetadataPageComponent', () => {
       expect(result.sort.direction).toEqual(SortDirection.ASC);
       expect(result.sort.field).toEqual('fake-field');
       expect(result.scope).toEqual('fake-scope');
+      expect(result.fetchThumbnail).toBeTrue();
+    });
+  });
+
+  describe('calling getBrowseSearchOptions', () => {
+    let result: BrowseEntrySearchOptions;
+
+    beforeEach(() => {
+      const paramsScope = {
+        scope: 'fake-scope'
+      };
+      const paginationOptions = Object.assign(new PaginationComponentOptions(), {
+        currentPage: 5,
+        pageSize: comp.appConfig.browseBy.pageSize,
+      });
+      const sortOptions = {
+        direction: SortDirection.ASC,
+        field: 'fake-field',
+      };
+
+      result = getBrowseSearchOptions('title', paginationOptions, sortOptions, comp.fetchThumbnails);
+    });
+    it('should return BrowseEntrySearchOptions with the correct properties', () => {
+
+      expect(result.metadataDefinition).toEqual('title');
+      expect(result.pagination.currentPage).toEqual(5);
+      expect(result.pagination.pageSize).toEqual(10);
+      expect(result.sort.direction).toEqual(SortDirection.ASC);
+      expect(result.sort.field).toEqual('fake-field');
+      expect(result.fetchThumbnail).toBeTrue();
     });
   });
 });

src/app/browse-by/browse-by-metadata-page/browse-by-metadata-page.component.ts

@@ -1,5 +1,5 @@
 import { combineLatest as observableCombineLatest, Observable, Subscription } from 'rxjs';
-import { Component, OnInit } from '@angular/core';
+import { Component, Inject, OnInit } from '@angular/core';
 import { RemoteData } from '../../core/data/remote-data';
 import { PaginatedList } from '../../core/data/paginated-list.model';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
@@ -17,6 +17,7 @@ import { StartsWithType } from '../../shared/starts-with/starts-with-decorator';
 import { BrowseByDataType, rendersBrowseBy } from '../browse-by-switcher/browse-by-decorator';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { map } from 'rxjs/operators';
+import { APP_CONFIG, AppConfig } from '../../../config/app-config.interface';
 
 export const BBM_PAGINATION_ID = 'bbm';
 
@@ -26,9 +27,10 @@ export const BBM_PAGINATION_ID = 'bbm';
   templateUrl: './browse-by-metadata-page.component.html'
 })
 /**
- * Component for browsing (items) by metadata definition
- * A metadata definition (a.k.a. browse id) is a short term used to describe one or multiple metadata fields.
- * An example would be 'author' for 'dc.contributor.*'
+ * Component for browsing (items) by metadata definition.
+ * A metadata definition (a.k.a. browse id) is a short term used to describe one
+ * or multiple metadata fields.  An example would be 'author' for
+ * 'dc.contributor.*'
  */
 @rendersBrowseBy(BrowseByDataType.Metadata)
 export class BrowseByMetadataPageComponent implements OnInit {
@@ -51,11 +53,7 @@ export class BrowseByMetadataPageComponent implements OnInit {
   /**
    * The pagination config used to display the values
    */
-  paginationConfig: PaginationComponentOptions = Object.assign(new PaginationComponentOptions(), {
-    id: BBM_PAGINATION_ID,
-    currentPage: 1,
-    pageSize: 20
-  });
+  paginationConfig: PaginationComponentOptions;
 
   /**
    * The pagination observable
@@ -111,16 +109,31 @@ export class BrowseByMetadataPageComponent implements OnInit {
    */
   startsWith: string;
 
+  /**
+   * Determines whether to request embedded thumbnail.
+   */
+  fetchThumbnails: boolean;
+
   public constructor(protected route: ActivatedRoute,
                      protected browseService: BrowseService,
                      protected dsoService: DSpaceObjectDataService,
                      protected paginationService: PaginationService,
-                     protected router: Router) {
+                     protected router: Router,
+                     @Inject(APP_CONFIG) public appConfig: AppConfig) {
+
+    this.fetchThumbnails = this.appConfig.browseBy.showThumbnails;
+    this.paginationConfig = Object.assign(new PaginationComponentOptions(), {
+        id: BBM_PAGINATION_ID,
+        currentPage: 1,
+        pageSize: this.appConfig.browseBy.pageSize,
+        });
     }
 
+
   ngOnInit(): void {
+
     const sortConfig = new SortOptions('default', SortDirection.ASC);
-    this.updatePage(new BrowseEntrySearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig));
+    this.updatePage(getBrowseSearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig));
     this.currentPagination$ = this.paginationService.getCurrentPagination(this.paginationConfig.id, this.paginationConfig);
     this.currentSort$ = this.paginationService.getCurrentSort(this.paginationConfig.id, sortConfig);
     this.subs.push(
@@ -133,15 +146,16 @@ export class BrowseByMetadataPageComponent implements OnInit {
           this.authority = params.authority;
           this.value = +params.value || params.value || '';
           this.startsWith = +params.startsWith || params.startsWith;
-          const searchOptions = browseParamsToOptions(params, currentPage, currentSort, this.browseId);
           if (isNotEmpty(this.value)) {
-            this.updatePageWithItems(searchOptions, this.value, this.authority);
+            this.updatePageWithItems(
+              browseParamsToOptions(params, currentPage, currentSort, this.browseId, this.fetchThumbnails), this.value, this.authority);
           } else {
-            this.updatePage(searchOptions);
+            this.updatePage(browseParamsToOptions(params, currentPage, currentSort, this.browseId, false));
           }
           this.updateParent(params.scope);
         }));
     this.updateStartsWithTextOptions();
+
   }
 
   /**
@@ -228,22 +242,44 @@ export class BrowseByMetadataPageComponent implements OnInit {
 
 }
 
+/**
+ * Creates browse entry search options.
+ * @param defaultBrowseId the metadata definition to fetch entries or items for
+ * @param paginationConfig the required pagination configuration
+ * @param sortConfig the required sort configuration
+ * @param fetchThumbnails optional boolean for fetching thumbnails
+ * @returns BrowseEntrySearchOptions instance
+ */
+export function getBrowseSearchOptions(defaultBrowseId: string,
+                                       paginationConfig: PaginationComponentOptions,
+                                       sortConfig: SortOptions,
+                                       fetchThumbnails?: boolean) {
+  if (!hasValue(fetchThumbnails)) {
+    fetchThumbnails = false;
+  }
+  return new BrowseEntrySearchOptions(defaultBrowseId, paginationConfig, sortConfig, null,
+    null, fetchThumbnails);
+}
+
 /**
  * Function to transform query and url parameters into searchOptions used to fetch browse entries or items
  * @param params            URL and query parameters
  * @param paginationConfig  Pagination configuration
  * @param sortConfig        Sorting configuration
  * @param metadata          Optional metadata definition to fetch browse entries/items for
+ * @param fetchThumbnail   Optional parameter for requesting thumbnail images
  */
 export function browseParamsToOptions(params: any,
                                       paginationConfig: PaginationComponentOptions,
                                       sortConfig: SortOptions,
-                                      metadata?: string): BrowseEntrySearchOptions {
+                                      metadata?: string,
+                                      fetchThumbnail?: boolean): BrowseEntrySearchOptions {
   return new BrowseEntrySearchOptions(
     metadata,
     paginationConfig,
     sortConfig,
     +params.startsWith || params.startsWith,
-    params.scope
+    params.scope,
+    fetchThumbnail
   );
 }

src/app/browse-by/browse-by-title-page/browse-by-title-page.component.spec.ts

@@ -18,11 +18,11 @@ import { BrowseService } from '../../core/browse/browse.service';
 import { RouterMock } from '../../shared/mocks/router.mock';
 import { VarDirective } from '../../shared/utils/var.directive';
 import { createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.utils';
-import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
-import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { PaginationServiceStub } from '../../shared/testing/pagination-service.stub';
-import { FindListOptions } from '../../core/data/find-list-options.model';
+import { APP_CONFIG } from '../../../config/app-config.interface';
+import { environment } from '../../../environments/environment';
+
 
 describe('BrowseByTitlePageComponent', () => {
   let comp: BrowseByTitlePageComponent;
@@ -77,7 +77,8 @@ describe('BrowseByTitlePageComponent', () => {
         { provide: BrowseService, useValue: mockBrowseService },
         { provide: DSpaceObjectDataService, useValue: mockDsoService },
         { provide: PaginationService, useValue: paginationService },
-        { provide: Router, useValue: new RouterMock() }
+        { provide: Router, useValue: new RouterMock() },
+        { provide: APP_CONFIG, useValue: environment }
       ],
       schemas: [NO_ERRORS_SCHEMA]
     }).compileComponents();

src/app/browse-by/browse-by-title-page/browse-by-title-page.component.ts

@@ -1,12 +1,11 @@
 import { combineLatest as observableCombineLatest } from 'rxjs';
-import { Component } from '@angular/core';
+import { Component, Inject } from '@angular/core';
 import { ActivatedRoute, Params, Router } from '@angular/router';
 import { hasValue } from '../../shared/empty.util';
 import {
   BrowseByMetadataPageComponent,
-  browseParamsToOptions
+  browseParamsToOptions, getBrowseSearchOptions
 } from '../browse-by-metadata-page/browse-by-metadata-page.component';
-import { BrowseEntrySearchOptions } from '../../core/browse/browse-entry-search-options.model';
 import { DSpaceObjectDataService } from '../../core/data/dspace-object-data.service';
 import { BrowseService } from '../../core/browse/browse.service';
 import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
@@ -14,6 +13,7 @@ import { BrowseByDataType, rendersBrowseBy } from '../browse-by-switcher/browse-
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { map } from 'rxjs/operators';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { AppConfig, APP_CONFIG } from '../../../config/app-config.interface';
 
 @Component({
   selector: 'ds-browse-by-title-page',
@@ -30,13 +30,15 @@ export class BrowseByTitlePageComponent extends BrowseByMetadataPageComponent {
                      protected browseService: BrowseService,
                      protected dsoService: DSpaceObjectDataService,
                      protected paginationService: PaginationService,
-                     protected router: Router) {
-    super(route, browseService, dsoService, paginationService, router);
+                     protected router: Router,
+                     @Inject(APP_CONFIG) public appConfig: AppConfig) {
+    super(route, browseService, dsoService, paginationService, router, appConfig);
   }
 
   ngOnInit(): void {
     const sortConfig = new SortOptions('dc.title', SortDirection.ASC);
-    this.updatePage(new BrowseEntrySearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig));
+    // include the thumbnail configuration in browse search options
+    this.updatePage(getBrowseSearchOptions(this.defaultBrowseId, this.paginationConfig, sortConfig, this.fetchThumbnails));
     this.currentPagination$ = this.paginationService.getCurrentPagination(this.paginationConfig.id, this.paginationConfig);
     this.currentSort$ = this.paginationService.getCurrentSort(this.paginationConfig.id, sortConfig);
     this.subs.push(
@@ -47,7 +49,7 @@ export class BrowseByTitlePageComponent extends BrowseByMetadataPageComponent {
       ).subscribe(([params, currentPage, currentSort]: [Params, PaginationComponentOptions, SortOptions]) => {
         this.startsWith = +params.startsWith || params.startsWith;
         this.browseId = params.id || this.defaultBrowseId;
-        this.updatePageWithItems(browseParamsToOptions(params, currentPage, currentSort, this.browseId), undefined, undefined);
+        this.updatePageWithItems(browseParamsToOptions(params, currentPage, currentSort, this.browseId, this.fetchThumbnails), undefined, undefined);
         this.updateParent(params.scope);
       }));
     this.updateStartsWithTextOptions();

src/app/collection-page/collection-form/collection-form.component.ts

@@ -16,7 +16,7 @@ import { CommunityDataService } from '../../core/data/community-data.service';
 import { AuthService } from '../../core/auth/auth.service';
 import { RequestService } from '../../core/data/request.service';
 import { ObjectCacheService } from '../../core/cache/object-cache.service';
-import { EntityTypeService } from '../../core/data/entity-type.service';
+import { EntityTypeDataService } from '../../core/data/entity-type-data.service';
 import { ItemType } from '../../core/shared/item-relationships/item-type.model';
 import { MetadataValue } from '../../core/shared/metadata.models';
 import { getFirstSucceededRemoteListPayload } from '../../core/shared/operators';
@@ -61,7 +61,7 @@ export class CollectionFormComponent extends ComColFormComponent<Collection> imp
                      protected dsoService: CommunityDataService,
                      protected requestService: RequestService,
                      protected objectCache: ObjectCacheService,
-                     protected entityTypeService: EntityTypeService) {
+                     protected entityTypeService: EntityTypeDataService) {
     super(formService, translate, notificationsService, authService, requestService, objectCache);
   }
 

src/app/collection-page/collection-item-mapper/collection-item-mapper.component.spec.ts

@@ -94,7 +94,7 @@ describe('CollectionItemMapperComponent', () => {
   const emptyList = createSuccessfulRemoteDataObject(createPaginatedList([]));
   const itemDataServiceStub = {
     mapToCollection: () => createSuccessfulRemoteDataObject$({}),
-    findAllByHref: () => observableOf(emptyList)
+    findListByHref: () => observableOf(emptyList),
   };
   const activatedRouteStub = {
     parent: {
@@ -152,7 +152,7 @@ describe('CollectionItemMapperComponent', () => {
   });
 
   const groupDataService = jasmine.createSpyObj('groupsDataService', {
-    findAllByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
+    findListByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
     getGroupRegistryRouterLink: '',
     getUUIDFromString: '',
   });

src/app/collection-page/collection-item-mapper/collection-item-mapper.component.ts

@@ -143,7 +143,7 @@ export class CollectionItemMapperComponent implements OnInit {
         if (shouldUpdate === true) {
           this.shouldUpdate$.next(false);
         }
-        return this.itemDataService.findAllByHref(collectionRD.payload._links.mappedItems.href, Object.assign(options, {
+        return this.itemDataService.findListByHref(collectionRD.payload._links.mappedItems.href, Object.assign(options, {
           sort: this.defaultSortOptions
         }),!shouldUpdate, false, followLink('owningCollection')).pipe(
           getAllSucceededRemoteData()

src/app/collection-page/collection-page.component.ts

@@ -28,6 +28,7 @@ import { AuthorizationDataService } from '../core/data/feature-authorization/aut
 import { FeatureID } from '../core/data/feature-authorization/feature-id';
 import { getCollectionPageRoute } from './collection-page-routing-paths';
 import { redirectOn4xx } from '../core/shared/authorized.operators';
+import { BROWSE_LINKS_TO_FOLLOW } from '../core/browse/browse.service';
 
 @Component({
   selector: 'ds-collection-page',
@@ -74,6 +75,7 @@ export class CollectionPageComponent implements OnInit {
     this.paginationConfig.pageSize = 5;
     this.paginationConfig.currentPage = 1;
     this.sortConfig = new SortOptions('dc.date.accessioned', SortDirection.DESC);
+
   }
 
   ngOnInit(): void {
@@ -102,13 +104,14 @@ export class CollectionPageComponent implements OnInit {
         getFirstSucceededRemoteData(),
         map((rd) => rd.payload.id),
         switchMap((id: string) => {
-          return this.searchService.search(
+          return this.searchService.search<Item>(
             new PaginatedSearchOptions({
               scope: id,
               pagination: currentPagination,
               sort: currentSort,
               dsoTypes: [DSpaceObjectType.ITEM]
-            })).pipe(toDSpaceObjectListRD()) as Observable<RemoteData<PaginatedList<Item>>>;
+            }), null, true, true, ...BROWSE_LINKS_TO_FOLLOW)
+            .pipe(toDSpaceObjectListRD()) as Observable<RemoteData<PaginatedList<Item>>>;
         }),
         startWith(undefined) // Make sure switching pages shows loading component
       )

src/app/collection-page/collection-page.resolver.ts

@@ -17,7 +17,7 @@ export const COLLECTION_PAGE_LINKS_TO_FOLLOW: FollowLinkConfig<Collection>[] = [
   followLink('parentCommunity', {},
     followLink('parentCommunity')
   ),
-  followLink('logo')
+  followLink('logo'),
 ];
 
 /**

src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.spec.ts

@@ -13,7 +13,7 @@ import { Item } from '../../../core/shared/item.model';
 import { ItemTemplateDataService } from '../../../core/data/item-template-data.service';
 import { Collection } from '../../../core/shared/collection.model';
 import { RequestService } from '../../../core/data/request.service';
-import { createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
+import { createFailedRemoteDataObject$, createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
 import { getCollectionItemTemplateRoute } from '../../collection-page-routing-paths';
 
 describe('CollectionMetadataComponent', () => {
@@ -39,8 +39,8 @@ describe('CollectionMetadataComponent', () => {
 
   const itemTemplateServiceStub = jasmine.createSpyObj('itemTemplateService', {
     findByCollectionID: createSuccessfulRemoteDataObject$(template),
-    create: createSuccessfulRemoteDataObject$(template),
-    deleteByCollectionID: observableOf(true),
+    createByCollectionID: createSuccessfulRemoteDataObject$(template),
+    delete: observableOf(true),
     getCollectionEndpoint: observableOf(collectionTemplateHref),
   });
 
@@ -91,12 +91,12 @@ describe('CollectionMetadataComponent', () => {
 
   describe('deleteItemTemplate', () => {
     beforeEach(() => {
-      (itemTemplateService.deleteByCollectionID as jasmine.Spy).and.returnValue(observableOf(true));
+      (itemTemplateService.delete as jasmine.Spy).and.returnValue(createSuccessfulRemoteDataObject$({}));
       comp.deleteItemTemplate();
     });
 
-    it('should call ItemTemplateService.deleteByCollectionID', () => {
-      expect(itemTemplateService.deleteByCollectionID).toHaveBeenCalledWith(template, 'collection-id');
+    it('should call ItemTemplateService.delete', () => {
+      expect(itemTemplateService.delete).toHaveBeenCalledWith(template.uuid);
     });
 
     describe('when delete returns a success', () => {
@@ -107,7 +107,7 @@ describe('CollectionMetadataComponent', () => {
 
     describe('when delete returns a failure', () => {
       beforeEach(() => {
-        (itemTemplateService.deleteByCollectionID as jasmine.Spy).and.returnValue(observableOf(false));
+        (itemTemplateService.delete as jasmine.Spy).and.returnValue(createFailedRemoteDataObject$());
         comp.deleteItemTemplate();
       });
 

src/app/collection-page/edit-collection-page/collection-metadata/collection-metadata.component.ts

@@ -7,12 +7,14 @@ import { ItemTemplateDataService } from '../../../core/data/item-template-data.s
 import { combineLatest as combineLatestObservable, Observable } from 'rxjs';
 import { RemoteData } from '../../../core/data/remote-data';
 import { Item } from '../../../core/shared/item.model';
-import { getFirstSucceededRemoteDataPayload } from '../../../core/shared/operators';
-import { switchMap } from 'rxjs/operators';
+import { getFirstCompletedRemoteData, getFirstSucceededRemoteDataPayload } from '../../../core/shared/operators';
+import { map, switchMap } from 'rxjs/operators';
 import { NotificationsService } from '../../../shared/notifications/notifications.service';
 import { TranslateService } from '@ngx-translate/core';
 import { RequestService } from '../../../core/data/request.service';
 import { getCollectionItemTemplateRoute } from '../../collection-page-routing-paths';
+import { NoContent } from '../../../core/shared/NoContent.model';
+import { hasValue } from '../../../shared/empty.util';
 
 /**
  * Component for editing a collection's metadata
@@ -65,7 +67,7 @@ export class CollectionMetadataComponent extends ComcolMetadataComponent<Collect
       getFirstSucceededRemoteDataPayload(),
     );
     const template$ = collection$.pipe(
-      switchMap((collection: Collection) => this.itemTemplateService.create(new Item(), collection.uuid).pipe(
+      switchMap((collection: Collection) => this.itemTemplateService.createByCollectionID(new Item(), collection.uuid).pipe(
         getFirstSucceededRemoteDataPayload(),
       )),
     );
@@ -83,18 +85,15 @@ export class CollectionMetadataComponent extends ComcolMetadataComponent<Collect
    * Delete the item template from the collection
    */
   deleteItemTemplate() {
-    const collection$ = this.dsoRD$.pipe(
+    this.dsoRD$.pipe(
       getFirstSucceededRemoteDataPayload(),
-    );
-    const template$ = collection$.pipe(
-      switchMap((collection: Collection) => this.itemTemplateService.findByCollectionID(collection.uuid).pipe(
+      switchMap((collection: Collection) => this.itemTemplateService.findByCollectionID(collection.uuid)),
       getFirstSucceededRemoteDataPayload(),
-      )),
-    );
-    combineLatestObservable(collection$, template$).pipe(
-      switchMap(([collection, template]) => {
-        return this.itemTemplateService.deleteByCollectionID(template, collection.uuid);
-      })
+      switchMap((template) => {
+        return this.itemTemplateService.delete(template.uuid);
+      }),
+      getFirstCompletedRemoteData(),
+      map((response: RemoteData<NoContent>) => hasValue(response) && response.hasSucceeded),
     ).subscribe((success: boolean) => {
       if (success) {
         this.notificationsService.success(null, this.translate.get('collection.edit.template.notifications.delete.success'));

src/app/community-list-page/community-list-service.spec.ts

@@ -15,6 +15,8 @@ import { Collection } from '../core/shared/collection.model';
 import { PageInfo } from '../core/shared/page-info.model';
 import { FlatNode } from './flat-node.model';
 import { FindListOptions } from '../core/data/find-list-options.model';
+import { APP_CONFIG } from 'src/config/app-config.interface';
+import { environment } from 'src/environments/environment.test';
 
 describe('CommunityListService', () => {
   let store: StoreMock<AppState>;
@@ -191,13 +193,14 @@ describe('CommunityListService', () => {
     };
     TestBed.configureTestingModule({
       providers: [CommunityListService,
+        { provide: APP_CONFIG, useValue: environment },
         { provide: CollectionDataService, useValue: collectionDataServiceStub },
         { provide: CommunityDataService, useValue: communityDataServiceStub },
         { provide: Store, useValue: StoreMock },
       ],
     });
     store = TestBed.inject(Store as any);
-    service = new CommunityListService(communityDataServiceStub, collectionDataServiceStub, store);
+    service = new CommunityListService(environment, communityDataServiceStub, collectionDataServiceStub, store);
   });
 
   it('should create', inject([CommunityListService], (serviceIn: CommunityListService) => {

src/app/community-list-page/community-list-service.ts

@@ -1,5 +1,5 @@
 /* eslint-disable max-classes-per-file */
-import { Injectable } from '@angular/core';
+import { Inject, Injectable } from '@angular/core';
 import { createSelector, Store } from '@ngrx/store';
 
 import { combineLatest as observableCombineLatest, Observable, of as observableOf } from 'rxjs';
@@ -23,6 +23,7 @@ import { followLink } from '../shared/utils/follow-link-config.model';
 import { FlatNode } from './flat-node.model';
 import { ShowMoreFlatNode } from './show-more-flat-node.model';
 import { FindListOptions } from '../core/data/find-list-options.model';
+import { AppConfig, APP_CONFIG } from 'src/config/app-config.interface';
 
 // Helper method to combine an flatten an array of observables of flatNode arrays
 export const combineAndFlatten = (obsList: Observable<FlatNode[]>[]): Observable<FlatNode[]> =>
@@ -80,8 +81,6 @@ const communityListStateSelector = (state: AppState) => state.communityList;
 const expandedNodesSelector = createSelector(communityListStateSelector, (communityList: CommunityListState) => communityList.expandedNodes);
 const loadingNodeSelector = createSelector(communityListStateSelector, (communityList: CommunityListState) => communityList.loadingNode);
 
-export const MAX_COMCOLS_PER_PAGE = 20;
-
 /**
  * Service class for the community list, responsible for the creating of the flat list used by communityList dataSource
  *  and connection to the store to retrieve and save the state of the community list
@@ -89,8 +88,15 @@ export const MAX_COMCOLS_PER_PAGE = 20;
 @Injectable()
 export class CommunityListService {
 
-  constructor(private communityDataService: CommunityDataService, private collectionDataService: CollectionDataService,
-              private store: Store<any>) {
+  private pageSize: number;
+
+  constructor(
+    @Inject(APP_CONFIG) protected appConfig: AppConfig,
+    private communityDataService: CommunityDataService,
+    private collectionDataService: CollectionDataService,
+    private store: Store<any>
+  ) {
+    this.pageSize = appConfig.communityList.pageSize;
   }
 
   private configOnePage: FindListOptions = Object.assign(new FindListOptions(), {
@@ -145,7 +151,7 @@ export class CommunityListService {
   private getTopCommunities(options: FindListOptions): Observable<PaginatedList<Community>> {
     return this.communityDataService.findTop({
         currentPage: options.currentPage,
-        elementsPerPage: MAX_COMCOLS_PER_PAGE,
+        elementsPerPage: this.pageSize,
         sort: {
           field: options.sort.field,
           direction: options.sort.direction
@@ -216,7 +222,7 @@ export class CommunityListService {
       let subcoms = [];
       for (let i = 1; i <= currentCommunityPage; i++) {
         const nextSetOfSubcommunitiesPage = this.communityDataService.findByParent(community.uuid, {
-            elementsPerPage: MAX_COMCOLS_PER_PAGE,
+            elementsPerPage: this.pageSize,
             currentPage: i
           },
           followLink('subcommunities', { findListOptions: this.configOnePage }),
@@ -241,7 +247,7 @@ export class CommunityListService {
       let collections = [];
       for (let i = 1; i <= currentCollectionPage; i++) {
         const nextSetOfCollectionsPage = this.collectionDataService.findByParent(community.uuid, {
-          elementsPerPage: MAX_COMCOLS_PER_PAGE,
+          elementsPerPage: this.pageSize,
           currentPage: i
         })
           .pipe(

src/app/community-page/community-page.component.html

@@ -25,12 +25,13 @@
         </div>
       </div>
       <section class="comcol-page-browse-section">
+
         <!-- Browse-By Links -->
         <ds-themed-comcol-page-browse-by [id]="communityPayload.id" [contentType]="communityPayload.type">
         </ds-themed-comcol-page-browse-by>
 
-        <ds-community-page-sub-community-list [community]="communityPayload"></ds-community-page-sub-community-list>
-        <ds-community-page-sub-collection-list [community]="communityPayload"></ds-community-page-sub-collection-list>
+        <ds-themed-community-page-sub-community-list [community]="communityPayload"></ds-themed-community-page-sub-community-list>
+        <ds-themed-community-page-sub-collection-list [community]="communityPayload"></ds-themed-community-page-sub-collection-list>
       </section>
       <footer  *ngIf="communityPayload.copyrightText"  class="border-top my-5 pt-4">
         <!-- Copyright -->

src/app/community-page/community-page.module.ts

@@ -13,10 +13,18 @@ import { StatisticsModule } from '../statistics/statistics.module';
 import { CommunityFormModule } from './community-form/community-form.module';
 import { ThemedCommunityPageComponent } from './themed-community-page.component';
 import { ComcolModule } from '../shared/comcol/comcol.module';
+import {
+  ThemedCommunityPageSubCommunityListComponent
+} from './sub-community-list/themed-community-page-sub-community-list.component';
+import {
+  ThemedCollectionPageSubCollectionListComponent
+} from './sub-collection-list/themed-community-page-sub-collection-list.component';
 
 const DECLARATIONS = [CommunityPageComponent,
   ThemedCommunityPageComponent,
+  ThemedCommunityPageSubCommunityListComponent,
   CommunityPageSubCollectionListComponent,
+  ThemedCollectionPageSubCollectionListComponent,
   CommunityPageSubCommunityListComponent,
   CreateCommunityPageComponent,
   DeleteCommunityPageComponent];

src/app/community-page/sub-collection-list/community-page-sub-collection-list.component.spec.ts

@@ -135,7 +135,7 @@ describe('CommunityPageSubCollectionList Component', () => {
   });
 
   const groupDataService = jasmine.createSpyObj('groupsDataService', {
-    findAllByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
+    findListByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
     getGroupRegistryRouterLink: '',
     getUUIDFromString: '',
   });

src/app/community-page/sub-collection-list/community-page-sub-collection-list.component.ts

@@ -1,4 +1,4 @@
-import { Component, Input, OnInit } from '@angular/core';
+import { Component, Input, OnDestroy, OnInit } from '@angular/core';
 
 import { BehaviorSubject, combineLatest as observableCombineLatest } from 'rxjs';
 
@@ -12,6 +12,7 @@ import { SortDirection, SortOptions } from '../../core/cache/models/sort-options
 import { CollectionDataService } from '../../core/data/collection-data.service';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { switchMap } from 'rxjs/operators';
+import { hasValue } from '../../shared/empty.util';
 
 @Component({
   selector: 'ds-community-page-sub-collection-list',
@@ -19,9 +20,15 @@ import { switchMap } from 'rxjs/operators';
   templateUrl: './community-page-sub-collection-list.component.html',
   animations:[fadeIn]
 })
-export class CommunityPageSubCollectionListComponent implements OnInit {
+export class CommunityPageSubCollectionListComponent implements OnInit, OnDestroy {
   @Input() community: Community;
 
+  /**
+   * Optional page size. Overrides communityList.pageSize configuration for this component.
+   * Value can be added in the themed version of the parent component.
+   */
+  @Input() pageSize: number;
+
   /**
    * The pagination configuration
    */
@@ -50,7 +57,9 @@ export class CommunityPageSubCollectionListComponent implements OnInit {
   ngOnInit(): void {
     this.config = new PaginationComponentOptions();
     this.config.id = this.pageId;
-    this.config.pageSize = 5;
+    if (hasValue(this.pageSize)) {
+      this.config.pageSize = this.pageSize;
+    }
     this.config.currentPage = 1;
     this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
     this.initPage();

src/app/community-page/sub-collection-list/themed-community-page-sub-collection-list.component.ts

@@ -0,0 +1,28 @@
+import { ThemedComponent } from '../../shared/theme-support/themed.component';
+import { CommunityPageSubCollectionListComponent } from './community-page-sub-collection-list.component';
+import { Component, Input } from '@angular/core';
+import { Community } from '../../core/shared/community.model';
+
+@Component({
+  selector: 'ds-themed-community-page-sub-collection-list',
+  styleUrls: [],
+  templateUrl: '../../shared/theme-support/themed.component.html',
+})
+export class ThemedCollectionPageSubCollectionListComponent extends ThemedComponent<CommunityPageSubCollectionListComponent> {
+  @Input() community: Community;
+  @Input() pageSize: number;
+  protected inAndOutputNames: (keyof CommunityPageSubCollectionListComponent & keyof this)[] = ['community', 'pageSize'];
+
+  protected getComponentName(): string {
+    return 'CommunityPageSubCollectionListComponent';
+  }
+
+  protected importThemedComponent(themeName: string): Promise<any> {
+    return import(`../../../themes/${themeName}/app/community-page/sub-collection-list/community-page-sub-collection-list.component`);
+  }
+
+  protected importUnthemedComponent(): Promise<any> {
+    return import(`./community-page-sub-collection-list.component`);
+  }
+
+}

src/app/community-page/sub-community-list/community-page-sub-community-list.component.spec.ts

@@ -131,7 +131,7 @@ describe('CommunityPageSubCommunityListComponent Component', () => {
   });
 
   const groupDataService = jasmine.createSpyObj('groupsDataService', {
-    findAllByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
+    findListByHref: createSuccessfulRemoteDataObject$(createPaginatedList([])),
     getGroupRegistryRouterLink: '',
     getUUIDFromString: '',
   });

src/app/community-page/sub-community-list/community-page-sub-community-list.component.ts

@@ -1,4 +1,4 @@
-import { Component, Input, OnInit } from '@angular/core';
+import { Component, Input, OnDestroy, OnInit } from '@angular/core';
 
 import { BehaviorSubject, combineLatest as observableCombineLatest } from 'rxjs';
 
@@ -12,6 +12,7 @@ import { CommunityDataService } from '../../core/data/community-data.service';
 import { takeUntilCompletedRemoteData } from '../../core/shared/operators';
 import { switchMap } from 'rxjs/operators';
 import { PaginationService } from '../../core/pagination/pagination.service';
+import { hasValue } from '../../shared/empty.util';
 
 @Component({
   selector: 'ds-community-page-sub-community-list',
@@ -22,9 +23,15 @@ import { PaginationService } from '../../core/pagination/pagination.service';
 /**
  * Component to render the sub-communities of a Community
  */
-export class CommunityPageSubCommunityListComponent implements OnInit {
+export class CommunityPageSubCommunityListComponent implements OnInit, OnDestroy {
   @Input() community: Community;
 
+  /**
+   * Optional page size. Overrides communityList.pageSize configuration for this component.
+   * Value can be added in the themed version of the parent component.
+   */
+  @Input() pageSize: number;
+
   /**
    * The pagination configuration
    */
@@ -53,7 +60,9 @@ export class CommunityPageSubCommunityListComponent implements OnInit {
   ngOnInit(): void {
     this.config = new PaginationComponentOptions();
     this.config.id = this.pageId;
-    this.config.pageSize = 5;
+    if (hasValue(this.pageSize)) {
+      this.config.pageSize = this.pageSize;
+    }
     this.config.currentPage = 1;
     this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
     this.initPage();

src/app/community-page/sub-community-list/themed-community-page-sub-community-list.component.ts

@@ -0,0 +1,29 @@
+import { ThemedComponent } from '../../shared/theme-support/themed.component';
+import { CommunityPageSubCommunityListComponent } from './community-page-sub-community-list.component';
+import { Component, Input } from '@angular/core';
+import { Community } from '../../core/shared/community.model';
+
+@Component({
+  selector: 'ds-themed-community-page-sub-community-list',
+  styleUrls: [],
+  templateUrl: '../../shared/theme-support/themed.component.html',
+})
+export class ThemedCommunityPageSubCommunityListComponent extends ThemedComponent<CommunityPageSubCommunityListComponent> {
+
+  @Input() community: Community;
+  @Input() pageSize: number;
+  protected inAndOutputNames: (keyof CommunityPageSubCommunityListComponent & keyof this)[] = ['community', 'pageSize'];
+
+  protected getComponentName(): string {
+    return 'CommunityPageSubCommunityListComponent';
+  }
+
+  protected importThemedComponent(themeName: string): Promise<any> {
+    return import(`../../../themes/${themeName}/app/community-page/sub-community-list/community-page-sub-community-list.component`);
+  }
+
+  protected importUnthemedComponent(): Promise<any> {
+    return import(`./community-page-sub-community-list.component`);
+  }
+
+}

src/app/core/auth/auth-request.service.spec.ts

@@ -111,7 +111,6 @@ describe(`AuthRequestService`, () => {
             body: undefined,
             options,
           }));
-          expect((service as any).fetchRequest).toHaveBeenCalledWith(requestID);
         });
       });
     });
@@ -151,7 +150,6 @@ describe(`AuthRequestService`, () => {
             body: { content: 'something' },
             options,
           }));
-          expect((service as any).fetchRequest).toHaveBeenCalledWith(requestID);
         });
       });
     });

src/app/core/auth/auth-request.service.ts

@@ -58,7 +58,9 @@ export abstract class AuthRequestService {
   public postToEndpoint(method: string, body?: any, options?: HttpOptions): Observable<RemoteData<AuthStatus>> {
     const requestId = this.requestService.generateRequestId();
 
-    this.halService.getEndpoint(this.linkName).pipe(
+    const endpoint$ = this.halService.getEndpoint(this.linkName);
+
+    endpoint$.pipe(
       filter((href: string) => isNotEmpty(href)),
       map((endpointURL) => this.getEndpointByMethod(endpointURL, method)),
       distinctUntilChanged(),
@@ -68,7 +70,9 @@ export abstract class AuthRequestService {
       this.requestService.send(request);
     });
 
-    return this.fetchRequest(requestId);
+    return endpoint$.pipe(
+      switchMap(() => this.fetchRequest(requestId)),
+    );
   }
 
   /**
@@ -79,7 +83,9 @@ export abstract class AuthRequestService {
   public getRequest(method: string, options?: HttpOptions, ...linksToFollow: FollowLinkConfig<any>[]): Observable<RemoteData<AuthStatus>> {
     const requestId = this.requestService.generateRequestId();
 
-    this.halService.getEndpoint(this.linkName).pipe(
+    const endpoint$ = this.halService.getEndpoint(this.linkName);
+
+    endpoint$.pipe(
       filter((href: string) => isNotEmpty(href)),
       map((endpointURL) => this.getEndpointByMethod(endpointURL, method, ...linksToFollow)),
       distinctUntilChanged(),
@@ -89,7 +95,9 @@ export abstract class AuthRequestService {
       this.requestService.send(request);
     });
 
-    return this.fetchRequest(requestId, ...linksToFollow);
+    return endpoint$.pipe(
+      switchMap(() => this.fetchRequest(requestId, ...linksToFollow)),
+    );
   }
   /**
    * Factory function to create the request object to send. This needs to be a POST client side and

src/app/core/breadcrumbs/dso-breadcrumb.resolver.ts

@@ -2,23 +2,26 @@ import { BreadcrumbConfig } from '../../breadcrumbs/breadcrumb/breadcrumb-config
 import { Injectable } from '@angular/core';
 import { ActivatedRouteSnapshot, Resolve, RouterStateSnapshot } from '@angular/router';
 import { DSOBreadcrumbsService } from './dso-breadcrumbs.service';
-import { DataService } from '../data/data.service';
-import { getRemoteDataPayload, getFirstCompletedRemoteData } from '../shared/operators';
+import { getFirstCompletedRemoteData, getRemoteDataPayload } from '../shared/operators';
 import { map } from 'rxjs/operators';
 import { Observable } from 'rxjs';
 import { DSpaceObject } from '../shared/dspace-object.model';
 import { ChildHALResource } from '../shared/child-hal-resource.model';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
 import { hasValue } from '../../shared/empty.util';
+import { IdentifiableDataService } from '../data/base/identifiable-data.service';
 
 /**
  * The class that resolves the BreadcrumbConfig object for a DSpaceObject
  */
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 export abstract class DSOBreadcrumbResolver<T extends ChildHALResource & DSpaceObject> implements Resolve<BreadcrumbConfig<T>> {
-  constructor(protected breadcrumbService: DSOBreadcrumbsService, protected dataService: DataService<T>) {
+  protected constructor(
+    protected breadcrumbService: DSOBreadcrumbsService,
+    protected dataService: IdentifiableDataService<T>,
+  ) {
   }
 
   /**

src/app/core/breadcrumbs/dso-name.service.ts

@@ -31,6 +31,8 @@ export class DSONameService {
       const givenName = dso.firstMetadataValue('person.givenName');
       if (isEmpty(familyName) && isEmpty(givenName)) {
         return dso.firstMetadataValue('dc.title') || dso.name;
+      } else if (isEmpty(familyName) || isEmpty(givenName)) {
+        return familyName || givenName;
       } else {
         return `${familyName}, ${givenName}`;
       }
@@ -55,11 +57,14 @@ export class DSONameService {
       .filter((type) => typeof type === 'string')
       .find((type: string) => Object.keys(this.factories).includes(type)) as string;
 
+    let name;
     if (hasValue(match)) {
-      return this.factories[match](dso);
-    } else {
-      return  this.factories.Default(dso);
+      name = this.factories[match](dso);
     }
+    if (isEmpty(name)) {
+      name = this.factories.Default(dso);
+    }
+    return name;
   }
 
 }

src/app/core/browse/browse-definition-data.service.spec.ts

@@ -5,15 +5,9 @@ import { FindListOptions } from '../data/find-list-options.model';
 
 describe(`BrowseDefinitionDataService`, () => {
   let service: BrowseDefinitionDataService;
-  const dataServiceImplSpy = jasmine.createSpyObj('dataService', {
+  const findAllDataSpy = jasmine.createSpyObj('findAllData', {
     findAll: EMPTY,
-    findByHref: EMPTY,
-    findAllByHref: EMPTY,
-    findById: EMPTY,
   });
-  const hrefAll = 'https://rest.api/server/api/discover/browses';
-  const hrefSingle = 'https://rest.api/server/api/discover/browses/author';
-  const id = 'author';
   const options = new FindListOptions();
   const linksToFollow = [
     followLink('entries'),
@@ -21,35 +15,14 @@ describe(`BrowseDefinitionDataService`, () => {
   ];
 
   beforeEach(() => {
-    service = new BrowseDefinitionDataService(null, null, null, null, null, null, null, null);
-    (service as any).dataService = dataServiceImplSpy;
+    service = new BrowseDefinitionDataService(null, null, null, null);
+    (service as any).findAllData = findAllDataSpy;
   });
 
   describe(`findAll`, () => {
-    it(`should call findAll on DataServiceImpl`, () => {
+    it(`should call findAll on findAllData`, () => {
       service.findAll(options, true, false, ...linksToFollow);
-      expect(dataServiceImplSpy.findAll).toHaveBeenCalledWith(options, true, false, ...linksToFollow);
-    });
-  });
-
-  describe(`findByHref`, () => {
-    it(`should call findByHref on DataServiceImpl`, () => {
-      service.findByHref(hrefSingle, true, false, ...linksToFollow);
-      expect(dataServiceImplSpy.findByHref).toHaveBeenCalledWith(hrefSingle, true, false, ...linksToFollow);
-    });
-  });
-
-  describe(`findAllByHref`, () => {
-    it(`should call findAllByHref on DataServiceImpl`, () => {
-      service.findAllByHref(hrefAll, options, true, false, ...linksToFollow);
-      expect(dataServiceImplSpy.findAllByHref).toHaveBeenCalledWith(hrefAll, options, true, false, ...linksToFollow);
-    });
-  });
-
-  describe(`findById`, () => {
-    it(`should call findById on DataServiceImpl`, () => {
-      service.findAllByHref(id, options, true, false, ...linksToFollow);
-      expect(dataServiceImplSpy.findAllByHref).toHaveBeenCalledWith(id, options, true, false, ...linksToFollow);
+      expect(findAllDataSpy.findAll).toHaveBeenCalledWith(options, true, false, ...linksToFollow);
     });
   });
 });

src/app/core/browse/browse-definition-data.service.ts

@@ -1,61 +1,38 @@
-/* eslint-disable max-classes-per-file */
 import { Injectable } from '@angular/core';
-import { dataService } from '../cache/builders/build-decorators';
 import { BROWSE_DEFINITION } from '../shared/browse-definition.resource-type';
-import { DataService } from '../data/data.service';
 import { BrowseDefinition } from '../shared/browse-definition.model';
 import { RequestService } from '../data/request.service';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { Store } from '@ngrx/store';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
-import { DefaultChangeAnalyzer } from '../data/default-change-analyzer.service';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
 import { Observable } from 'rxjs';
 import { RemoteData } from '../data/remote-data';
 import { PaginatedList } from '../data/paginated-list.model';
-import { CoreState } from '../core-state.model';
 import { FindListOptions } from '../data/find-list-options.model';
+import { IdentifiableDataService } from '../data/base/identifiable-data.service';
+import { FindAllData, FindAllDataImpl } from '../data/base/find-all-data';
+import { dataService } from '../data/base/data-service.decorator';
 
-
-class DataServiceImpl extends DataService<BrowseDefinition> {
-  protected linkPath = 'browses';
-
-  constructor(
-    protected requestService: RequestService,
-    protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
-    protected objectCache: ObjectCacheService,
-    protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<BrowseDefinition>) {
-    super();
-  }
-}
-
+/**
+ * Data service responsible for retrieving browse definitions from the REST server
+ */
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 @dataService(BROWSE_DEFINITION)
-export class BrowseDefinitionDataService {
-  /**
-   * A private DataService instance to delegate specific methods to.
-   */
-  private dataService: DataServiceImpl;
+export class BrowseDefinitionDataService extends IdentifiableDataService<BrowseDefinition> implements FindAllData<BrowseDefinition> {
+  private findAllData: FindAllDataImpl<BrowseDefinition>;
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<BrowseDefinition>) {
-    this.dataService = new DataServiceImpl(requestService, rdbService, null, objectCache, halService, notificationsService, http, comparator);
+  ) {
+    super('browses', requestService, rdbService, objectCache, halService);
+
+    this.findAllData = new FindAllDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, this.responseMsToLive);
   }
 
   /**
@@ -69,57 +46,11 @@ export class BrowseDefinitionDataService {
    *                                    requested after the response becomes stale
    * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
    *                                    {@link HALLink}s should be automatically resolved
-   * @return {Observable<RemoteData<PaginatedList<BrowseDefinition>>>}
+   * @return {Observable<RemoteData<PaginatedList<T>>>}
    *    Return an observable that emits object list
    */
   findAll(options: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<BrowseDefinition>[]): Observable<RemoteData<PaginatedList<BrowseDefinition>>> {
-    return this.dataService.findAll(options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
-  }
-
-  /**
-   * Returns an observable of {@link RemoteData} of an {@link BrowseDefinition}, based on an href, with a list of {@link FollowLinkConfig},
-   * to automatically resolve {@link HALLink}s of the {@link BrowseDefinition}
-   * @param href                        The url of {@link BrowseDefinition} we want to retrieve
-   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
-   *                                    no valid cached version. Defaults to true
-   * @param reRequestOnStale            Whether or not the request should automatically be re-
-   *                                    requested after the response becomes stale
-   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
-   *                                    {@link HALLink}s should be automatically resolved
-   */
-  findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<BrowseDefinition>[]): Observable<RemoteData<BrowseDefinition>> {
-    return this.dataService.findByHref(href, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
-  }
-
-  /**
-   * Returns a list of observables of {@link RemoteData} of {@link BrowseDefinition}s, based on an href, with a list of {@link FollowLinkConfig},
-   * to automatically resolve {@link HALLink}s of the {@link BrowseDefinition}
-   * @param href                        The url of object we want to retrieve
-   * @param findListOptions             Find list options object
-   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
-   *                                    no valid cached version. Defaults to true
-   * @param reRequestOnStale            Whether or not the request should automatically be re-
-   *                                    requested after the response becomes stale
-   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
-   *                                    {@link HALLink}s should be automatically resolved
-   */
-  findAllByHref(href: string, findListOptions: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<BrowseDefinition>[]): Observable<RemoteData<PaginatedList<BrowseDefinition>>> {
-    return this.dataService.findAllByHref(href, findListOptions, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
-  }
-
-  /**
-   * Returns an observable of {@link RemoteData} of an object, based on its ID, with a list of
-   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
-   * @param id                          ID of object we want to retrieve
-   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
-   *                                    no valid cached version. Defaults to true
-   * @param reRequestOnStale            Whether or not the request should automatically be re-
-   *                                    requested after the response becomes stale
-   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
-   *                                    {@link HALLink}s should be automatically resolved
-   */
-  findById(id: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<BrowseDefinition>[]): Observable<RemoteData<BrowseDefinition>> {
-    return this.dataService.findById(id, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+    return this.findAllData.findAll(options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
   }
 }
 

src/app/core/browse/browse-entry-search-options.model.ts

@@ -6,13 +6,16 @@ import { SortOptions } from '../cache/models/sort-options.model';
  * - metadataDefinition:  The metadata definition to fetch entries or items for
  * - pagination:          Optional pagination options to use
  * - sort:                Optional sorting options to use
+ * - startsWith           An optional value to use to filter the browse results
  * - scope:               An optional scope to limit the results within a specific collection or community
+ * - fetchThumbnail       An optional boolean to request thumbnail for items
  */
 export class BrowseEntrySearchOptions {
   constructor(public metadataDefinition: string,
               public pagination?: PaginationComponentOptions,
               public sort?: SortOptions,
               public startsWith?: string,
-              public scope?: string) {
+              public scope?: string,
+              public fetchThumbnail?: boolean) {
   }
 }

src/app/core/browse/browse.service.spec.ts

@@ -139,13 +139,13 @@ describe('BrowseService', () => {
     });
 
     describe('when getBrowseEntriesFor is called with a valid browse definition id', () => {
-      it('should call hrefOnlyDataService.findAllByHref with the expected href', () => {
+      it('should call hrefOnlyDataService.findListByHref with the expected href', () => {
         const expected = browseDefinitions[1]._links.entries.href;
 
         scheduler.schedule(() => service.getBrowseEntriesFor(new BrowseEntrySearchOptions(browseDefinitions[1].id)).subscribe());
         scheduler.flush();
 
-        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findAllByHref)).toBeObservable(cold('(a|)', {
+        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findListByHref)).toBeObservable(cold('(a|)', {
           a: expected
         }));
       });
@@ -153,20 +153,20 @@ describe('BrowseService', () => {
     });
 
     describe('when findList is called with a valid browse definition id', () => {
-      it('should call hrefOnlyDataService.findAllByHref with the expected href', () => {
+      it('should call hrefOnlyDataService.findListByHref with the expected href', () => {
         const expected = browseDefinitions[1]._links.items.href + '?filterValue=' + encodeURIComponent(mockAuthorName);
 
         scheduler.schedule(() => service.getBrowseItemsFor(mockAuthorName, undefined, new BrowseEntrySearchOptions(browseDefinitions[1].id)).subscribe());
         scheduler.flush();
 
-        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findAllByHref)).toBeObservable(cold('(a|)', {
+        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findListByHref)).toBeObservable(cold('(a|)', {
           a: expected
         }));
       });
 
     });
     describe('when getBrowseItemsFor is called with a valid filter value and authority key', () => {
-      it('should call hrefOnlyDataService.findAllByHref with the expected href', () => {
+      it('should call hrefOnlyDataService.findListByHref with the expected href', () => {
         const expected = browseDefinitions[1]._links.items.href +
           '?filterValue=' + encodeURIComponent(mockAuthorName) +
           '&filterAuthority=' + encodeURIComponent(mockAuthorityKey);
@@ -174,7 +174,7 @@ describe('BrowseService', () => {
         scheduler.schedule(() => service.getBrowseItemsFor(mockAuthorName, mockAuthorityKey, new BrowseEntrySearchOptions(browseDefinitions[1].id)).subscribe());
         scheduler.flush();
 
-        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findAllByHref)).toBeObservable(cold('(a|)', {
+        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findListByHref)).toBeObservable(cold('(a|)', {
           a: expected
         }));
       });
@@ -267,11 +267,11 @@ describe('BrowseService', () => {
     describe('when getFirstItemFor is called with a valid browse definition id', () => {
       const expectedURL = browseDefinitions[1]._links.items.href + '?page=0&size=1';
 
-      it('should call hrefOnlyDataService.findAllByHref with the expected href', () => {
+      it('should call hrefOnlyDataService.findListByHref with the expected href', () => {
         scheduler.schedule(() => service.getFirstItemFor(browseDefinitions[1].id).subscribe());
         scheduler.flush();
 
-        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findAllByHref)).toBeObservable(cold('(a|)', {
+        expect(getFirstUsedArgumentOfSpyMethod(hrefOnlyDataService.findListByHref)).toBeObservable(cold('(a|)', {
           a: expectedURL
         }));
       });

src/app/core/browse/browse.service.ts

@@ -21,6 +21,12 @@ import { URLCombiner } from '../url-combiner/url-combiner';
 import { BrowseEntrySearchOptions } from './browse-entry-search-options.model';
 import { BrowseDefinitionDataService } from './browse-definition-data.service';
 import { HrefOnlyDataService } from '../data/href-only-data.service';
+import { followLink, FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
+
+
+export const BROWSE_LINKS_TO_FOLLOW: FollowLinkConfig<BrowseEntry | Item>[] = [
+  followLink('thumbnail')
+];
 
 /**
  * The service handling all browse requests
@@ -96,7 +102,10 @@ export class BrowseService {
         return href;
       })
     );
-    return this.hrefOnlyDataService.findAllByHref<BrowseEntry>(href$);
+    if (options.fetchThumbnail ) {
+      return this.hrefOnlyDataService.findListByHref<BrowseEntry>(href$, {}, null, null, ...BROWSE_LINKS_TO_FOLLOW);
+    }
+    return this.hrefOnlyDataService.findListByHref<BrowseEntry>(href$);
   }
 
   /**
@@ -141,7 +150,10 @@ export class BrowseService {
         return href;
       }),
     );
-    return this.hrefOnlyDataService.findAllByHref<Item>(href$);
+    if (options.fetchThumbnail) {
+      return this.hrefOnlyDataService.findListByHref<Item>(href$, {}, null, null, ...BROWSE_LINKS_TO_FOLLOW);
+    }
+    return this.hrefOnlyDataService.findListByHref<Item>(href$);
   }
 
   /**
@@ -172,7 +184,7 @@ export class BrowseService {
       })
     );
 
-    return this.hrefOnlyDataService.findAllByHref<Item>(href$).pipe(
+    return this.hrefOnlyDataService.findListByHref<Item>(href$).pipe(
       getFirstSucceededRemoteData(),
       getFirstOccurrence()
     );
@@ -184,7 +196,7 @@ export class BrowseService {
    * @param items
    */
   getPrevBrowseItems(items: RemoteData<PaginatedList<Item>>): Observable<RemoteData<PaginatedList<Item>>> {
-    return this.hrefOnlyDataService.findAllByHref<Item>(items.payload.prev);
+    return this.hrefOnlyDataService.findListByHref<Item>(items.payload.prev);
   }
 
   /**
@@ -192,7 +204,7 @@ export class BrowseService {
    * @param items
    */
   getNextBrowseItems(items: RemoteData<PaginatedList<Item>>): Observable<RemoteData<PaginatedList<Item>>> {
-    return this.hrefOnlyDataService.findAllByHref<Item>(items.payload.next);
+    return this.hrefOnlyDataService.findListByHref<Item>(items.payload.next);
   }
 
   /**
@@ -200,7 +212,7 @@ export class BrowseService {
    * @param entries
    */
   getPrevBrowseEntries(entries: RemoteData<PaginatedList<BrowseEntry>>): Observable<RemoteData<PaginatedList<BrowseEntry>>> {
-    return this.hrefOnlyDataService.findAllByHref<BrowseEntry>(entries.payload.prev);
+    return this.hrefOnlyDataService.findListByHref<BrowseEntry>(entries.payload.prev);
   }
 
   /**
@@ -208,7 +220,7 @@ export class BrowseService {
    * @param entries
    */
   getNextBrowseEntries(entries: RemoteData<PaginatedList<BrowseEntry>>): Observable<RemoteData<PaginatedList<BrowseEntry>>> {
-    return this.hrefOnlyDataService.findAllByHref<BrowseEntry>(entries.payload.next);
+    return this.hrefOnlyDataService.findListByHref<BrowseEntry>(entries.payload.next);
   }
 
   /**

src/app/core/cache/builders/build-decorators.spec.ts

@@ -1,14 +1,7 @@
-/* eslint-disable max-classes-per-file */
 import { HALLink } from '../../shared/hal-link.model';
 import { HALResource } from '../../shared/hal-resource.model';
 import { ResourceType } from '../../shared/resource-type';
-import { dataService, getDataServiceFor, getLinkDefinition, link, } from './build-decorators';
-
-class TestService {
-}
-
-class AnotherTestService {
-}
+import { getLinkDefinition, link } from './build-decorators';
 
 class TestHALResource implements HALResource {
   _links: {
@@ -25,31 +18,6 @@ describe('build decorators', () => {
   beforeEach(() => {
     testType = new ResourceType('testType-' + new Date().getTime());
   });
-  describe('@dataService/getDataServiceFor', () => {
-
-    it('should register a resourcetype for a dataservice', () => {
-      dataService(testType)(TestService);
-      expect(getDataServiceFor(testType)).toBe(TestService);
-    });
-
-    describe(`when the resource type isn't specified`, () => {
-      it(`should throw an error`, () => {
-        expect(() => {
-          dataService(undefined)(TestService);
-        }).toThrow();
-      });
-    });
-
-    describe(`when there already is a registered dataservice for a resourcetype`, () => {
-      it(`should throw an error`, () => {
-        dataService(testType)(TestService);
-        expect(() => {
-          dataService(testType)(AnotherTestService);
-        }).toThrow();
-      });
-    });
-
-  });
 
   describe(`@link/getLinkDefinitions`, () => {
     it(`should register a link`, () => {

src/app/core/cache/builders/build-decorators.ts

@@ -3,20 +3,13 @@ import { hasNoValue, hasValue } from '../../../shared/empty.util';
 import { GenericConstructor } from '../../shared/generic-constructor';
 import { HALResource } from '../../shared/hal-resource.model';
 import { ResourceType } from '../../shared/resource-type';
-import {
-  getResourceTypeValueFor
-} from '../object-cache.reducer';
+import { getResourceTypeValueFor } from '../object-cache.reducer';
 import { InjectionToken } from '@angular/core';
-import { CacheableObject } from '../cacheable-object.model';
 import { TypedObject } from '../typed-object.model';
 
-export const DATA_SERVICE_FACTORY = new InjectionToken<(resourceType: ResourceType) => GenericConstructor<any>>('getDataServiceFor', {
-  providedIn: 'root',
-  factory: () => getDataServiceFor
-});
 export const LINK_DEFINITION_FACTORY = new InjectionToken<<T extends HALResource>(source: GenericConstructor<T>, linkName: keyof T['_links']) => LinkDefinition<T>>('getLinkDefinition', {
   providedIn: 'root',
-  factory: () => getLinkDefinition
+  factory: () => getLinkDefinition,
 });
 export const LINK_DEFINITION_MAP_FACTORY = new InjectionToken<<T extends HALResource>(source: GenericConstructor<T>) => Map<keyof T['_links'], LinkDefinition<T>>>('getLinkDefinitions', {
   providedIn: 'root',
@@ -27,7 +20,6 @@ const resolvedLinkKey = Symbol('resolvedLink');
 
 const resolvedLinkMap = new Map();
 const typeMap = new Map();
-const dataServiceMap = new Map();
 const linkMap = new Map();
 
 /**
@@ -46,39 +38,6 @@ export function getClassForType(type: string | ResourceType) {
   return typeMap.get(getResourceTypeValueFor(type));
 }
 
-/**
- * A class decorator to indicate that this class is a dataservice
- * for a given resource type.
- *
- * "dataservice" in this context means that it has findByHref and
- * findAllByHref methods.
- *
- * @param resourceType the resource type the class is a dataservice for
- */
-export function dataService(resourceType: ResourceType): any {
-  return (target: any) => {
-    if (hasNoValue(resourceType)) {
-      throw new Error(`Invalid @dataService annotation on ${target}, resourceType needs to be defined`);
-    }
-    const existingDataservice = dataServiceMap.get(resourceType.value);
-
-    if (hasValue(existingDataservice)) {
-      throw new Error(`Multiple dataservices for ${resourceType.value}: ${existingDataservice} and ${target}`);
-    }
-
-    dataServiceMap.set(resourceType.value, target);
-  };
-}
-
-/**
- * Return the dataservice matching the given resource type
- *
- * @param resourceType the resource type you want the matching dataservice for
- */
-export function getDataServiceFor<T extends CacheableObject>(resourceType: ResourceType) {
-  return dataServiceMap.get(resourceType.value);
-}
-
 /**
  * A class to represent the data that can be set by the @link decorator
  */

src/app/core/cache/builders/link.service.spec.ts

@@ -6,9 +6,10 @@ import { HALLink } from '../../shared/hal-link.model';
 import { HALResource } from '../../shared/hal-resource.model';
 import { ResourceType } from '../../shared/resource-type';
 import { LinkService } from './link.service';
-import { DATA_SERVICE_FACTORY, LINK_DEFINITION_FACTORY, LINK_DEFINITION_MAP_FACTORY } from './build-decorators';
+import { LINK_DEFINITION_FACTORY, LINK_DEFINITION_MAP_FACTORY } from './build-decorators';
 import { isEmpty } from 'rxjs/operators';
 import { FindListOptions } from '../../data/find-list-options.model';
+import { DATA_SERVICE_FACTORY } from '../../data/base/data-service.decorator';
 
 const TEST_MODEL = new ResourceType('testmodel');
 let result: any;
@@ -32,8 +33,8 @@ class TestModel implements HALResource {
 
 @Injectable()
 class TestDataService {
-  findAllByHref(href: string, findListOptions: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<any>[]) {
-    return 'findAllByHref';
+  findListByHref(href: string, findListOptions: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<any>[]) {
+    return 'findListByHref';
   }
 
   findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<any>[]) {
@@ -64,7 +65,7 @@ describe('LinkService', () => {
       }
     });
     testDataService = new TestDataService();
-    spyOn(testDataService, 'findAllByHref').and.callThrough();
+    spyOn(testDataService, 'findListByHref').and.callThrough();
     spyOn(testDataService, 'findByHref').and.callThrough();
     TestBed.configureTestingModule({
       providers: [LinkService, {
@@ -118,8 +119,8 @@ describe('LinkService', () => {
         });
         service.resolveLink(testModel, followLink('predecessor', { findListOptions: { some: 'options ' } as any }, followLink('successor')));
       });
-      it('should call dataservice.findAllByHref with the correct href, findListOptions,  and nested links', () => {
-        expect(testDataService.findAllByHref).toHaveBeenCalledWith(testModel._links.predecessor.href, { some: 'options ' } as any, true, true, followLink('successor'));
+      it('should call dataservice.findListByHref with the correct href, findListOptions,  and nested links', () => {
+        expect(testDataService.findListByHref).toHaveBeenCalledWith(testModel._links.predecessor.href, { some: 'options ' } as any, true, true, followLink('successor'));
       });
     });
     describe('either way', () => {

src/app/core/cache/builders/link.service.ts

@@ -3,28 +3,30 @@ import { hasNoValue, hasValue, isNotEmpty } from '../../../shared/empty.util';
 import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
 import { GenericConstructor } from '../../shared/generic-constructor';
 import { HALResource } from '../../shared/hal-resource.model';
+import { DATA_SERVICE_FACTORY } from '../../data/base/data-service.decorator';
 import {
-  DATA_SERVICE_FACTORY,
   LINK_DEFINITION_FACTORY,
   LINK_DEFINITION_MAP_FACTORY,
-  LinkDefinition
+  LinkDefinition,
 } from './build-decorators';
 import { RemoteData } from '../../data/remote-data';
 import { EMPTY, Observable } from 'rxjs';
 import { ResourceType } from '../../shared/resource-type';
+import { HALDataService } from '../../data/base/hal-data-service.interface';
+import { PaginatedList } from '../../data/paginated-list.model';
 
 /**
  * A Service to handle the resolving and removing
  * of resolved {@link HALLink}s on HALResources
  */
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 export class LinkService {
 
   constructor(
     protected parentInjector: Injector,
-    @Inject(DATA_SERVICE_FACTORY) private getDataServiceFor: (resourceType: ResourceType) => GenericConstructor<any>,
+    @Inject(DATA_SERVICE_FACTORY) private getDataServiceFor: (resourceType: ResourceType) => GenericConstructor<HALDataService<any>>,
     @Inject(LINK_DEFINITION_FACTORY) private getLinkDefinition: <T extends HALResource>(source: GenericConstructor<T>, linkName: keyof T['_links']) => LinkDefinition<T>,
     @Inject(LINK_DEFINITION_MAP_FACTORY) private getLinkDefinitions: <T extends HALResource>(source: GenericConstructor<T>) => Map<keyof T['_links'], LinkDefinition<T>>,
   ) {
@@ -51,7 +53,7 @@ export class LinkService {
    * @param model the {@link HALResource} to resolve the link for
    * @param linkToFollow the {@link FollowLinkConfig} to resolve
    */
-  public resolveLinkWithoutAttaching<T extends HALResource, U extends HALResource>(model, linkToFollow: FollowLinkConfig<T>): Observable<RemoteData<U>> {
+  public resolveLinkWithoutAttaching<T extends HALResource, U extends HALResource>(model, linkToFollow: FollowLinkConfig<T>): Observable<RemoteData<U | PaginatedList<U>>> {
     const matchingLinkDef = this.getLinkDefinition(model.constructor, linkToFollow.name);
 
     if (hasValue(matchingLinkDef)) {
@@ -61,9 +63,9 @@ export class LinkService {
         throw new Error(`The @link() for ${linkToFollow.name} on ${model.constructor.name} models uses the resource type ${matchingLinkDef.resourceType.value.toUpperCase()}, but there is no service with an @dataService(${matchingLinkDef.resourceType.value.toUpperCase()}) annotation in order to retrieve it`);
       }
 
-      const service = Injector.create({
+      const service: HALDataService<any> = Injector.create({
         providers: [],
-        parent: this.parentInjector
+        parent: this.parentInjector,
       }).get(provider);
 
       const link = model._links[matchingLinkDef.linkName];
@@ -72,7 +74,7 @@ export class LinkService {
 
         try {
           if (matchingLinkDef.isList) {
-            return service.findAllByHref(href, linkToFollow.findListOptions, linkToFollow.useCachedVersionIfAvailable, linkToFollow.reRequestOnStale, ...linkToFollow.linksToFollow);
+            return service.findListByHref(href, linkToFollow.findListOptions, linkToFollow.useCachedVersionIfAvailable, linkToFollow.reRequestOnStale, ...linkToFollow.linksToFollow);
           } else {
             return service.findByHref(href, linkToFollow.useCachedVersionIfAvailable, linkToFollow.reRequestOnStale, ...linkToFollow.linksToFollow);
           }

src/app/core/cache/builders/remote-data-build.service.spec.ts

@@ -1,4 +1,4 @@
-import { createSuccessfulRemoteDataObject } from '../../../shared/remote-data.utils';
+import { createFailedRemoteDataObject, createPendingRemoteDataObject, createSuccessfulRemoteDataObject } from '../../../shared/remote-data.utils';
 import { buildPaginatedList, PaginatedList } from '../../data/paginated-list.model';
 import { Item } from '../../shared/item.model';
 import { PageInfo } from '../../shared/page-info.model';
@@ -18,6 +18,9 @@ import { take } from 'rxjs/operators';
 import { HALLink } from '../../shared/hal-link.model';
 import { RequestEntryState } from '../../data/request-entry-state.model';
 import { RequestEntry } from '../../data/request-entry.model';
+import { cold } from 'jasmine-marbles';
+import { TestScheduler } from 'rxjs/testing';
+import { fakeAsync, tick } from '@angular/core/testing';
 
 describe('RemoteDataBuildService', () => {
   let service: RemoteDataBuildService;
@@ -646,4 +649,211 @@ describe('RemoteDataBuildService', () => {
       });
     });
   });
+
+  describe('buildFromHref', () => {
+    beforeEach(() => {
+      (objectCache.getRequestUUIDBySelfLink as jasmine.Spy).and.returnValue(cold('a', { a: 'request/uuid' }));
+    });
+
+    describe('when both getRequestFromRequestHref and getRequestFromRequestUUID emit nothing', () => {
+      beforeEach(() => {
+        (requestService.getByHref as jasmine.Spy).and.returnValue(cold('a', { a: undefined }));
+        (requestService.getByUUID as jasmine.Spy).and.returnValue(cold('a', { a: undefined }));
+      });
+
+      it('should not emit anything', () => {
+        expect(service.buildFromHref(cold('a', { a: 'rest/api/endpoint' }))).toBeObservable(cold(''));
+      });
+    });
+
+    describe('when one of getRequestFromRequestHref or getRequestFromRequestUUID emits nothing', () => {
+      let requestEntry: RequestEntry;
+
+      beforeEach(() => {
+        requestEntry = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.Success,
+          request: {},
+        });
+        (requestService.getByHref as jasmine.Spy).and.returnValue(cold('a', { a: undefined }));
+        (requestService.getByUUID as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry }));
+        spyOn((service as any), 'buildPayload').and.returnValue(cold('a', { a: {} }));
+      });
+
+      it('should create remote-data with the existing request-entry', () => {
+        expect(service.buildFromHref(cold('a', { a: 'rest/api/endpoint' }))).toBeObservable(cold('a', {
+          a: new RemoteData(undefined, undefined, undefined, RequestEntryState.Success, undefined, {}, undefined),
+        }));
+      });
+    });
+
+    describe('when one of getRequestFromRequestHref or getRequestFromRequestUUID is stale', () => {
+      let requestEntry1: RequestEntry;
+      let requestEntry2: RequestEntry;
+
+      beforeEach(() => {
+        requestEntry1 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.Success,
+          request: {},
+        });
+        requestEntry2 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.SuccessStale,
+          request: {},
+        });
+        (requestService.getByHref as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry1 }));
+        (requestService.getByUUID as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry2 }));
+        spyOn((service as any), 'buildPayload').and.returnValue(cold('a', { a: {} }));
+      });
+
+      it('should create remote-data with the non-stale request-entry', () => {
+        expect(service.buildFromHref(cold('a', { a: 'rest/api/endpoint' }))).toBeObservable(cold('a', {
+          a: new RemoteData(undefined, undefined, undefined, RequestEntryState.Success, undefined, {}, undefined),
+        }));
+      });
+    });
+
+    describe('when both getRequestFromRequestHref and getRequestFromRequestUUID are stale', () => {
+      let requestEntry1: RequestEntry;
+      let requestEntry2: RequestEntry;
+
+      beforeEach(() => {
+        requestEntry1 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.SuccessStale,
+          request: {},
+          lastUpdated: 20,
+        });
+        requestEntry2 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.SuccessStale,
+          request: {},
+          lastUpdated: 10,
+        });
+        (requestService.getByHref as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry1 }));
+        (requestService.getByUUID as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry2 }));
+        spyOn((service as any), 'buildPayload').and.returnValue(cold('a', { a: {} }));
+      });
+
+      it('should create remote-data with the most up-to-date request-entry', () => {
+        expect(service.buildFromHref(cold('a', { a: 'rest/api/endpoint' }))).toBeObservable(cold('a', {
+          a: new RemoteData(undefined, undefined, 20, RequestEntryState.SuccessStale, undefined, {}, undefined),
+        }));
+      });
+    });
+
+    describe('when both getRequestFromRequestHref and getRequestFromRequestUUID are not stale', () => {
+      let requestEntry1: RequestEntry;
+      let requestEntry2: RequestEntry;
+
+      beforeEach(() => {
+        requestEntry1 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.Success,
+          request: {},
+          lastUpdated: 25,
+        });
+        requestEntry2 = Object.assign(new RequestEntry(), {
+          state: RequestEntryState.Success,
+          request: {},
+          lastUpdated: 5,
+        });
+        (requestService.getByHref as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry1 }));
+        (requestService.getByUUID as jasmine.Spy).and.returnValue(cold('a', { a: requestEntry2 }));
+        spyOn((service as any), 'buildPayload').and.returnValue(cold('a', { a: {} }));
+      });
+
+      it('should create remote-data with the most up-to-date request-entry', () => {
+        expect(service.buildFromHref(cold('a', { a: 'rest/api/endpoint' }))).toBeObservable(cold('a', {
+          a: new RemoteData(undefined, undefined, 25, RequestEntryState.Success, undefined, {}, undefined),
+        }));
+      });
+    });
+  });
+
+  describe('buildFromRequestUUIDAndAwait', () => {
+    let testScheduler;
+
+    let callback: jasmine.Spy;
+    let buildFromRequestUUIDSpy;
+
+    const BOOLEAN = { t: true, f: false };
+
+    const MOCK_PENDING_RD = createPendingRemoteDataObject();
+    const MOCK_SUCCEEDED_RD = createSuccessfulRemoteDataObject({});
+    const MOCK_FAILED_RD = createFailedRemoteDataObject('failed');
+
+    const RDs = {
+      p: MOCK_PENDING_RD,
+      s: MOCK_SUCCEEDED_RD,
+      f: MOCK_FAILED_RD,
+    };
+
+
+    beforeEach(() => {
+      testScheduler = new TestScheduler((actual, expected) => {
+        expect(actual).toEqual(expected);
+      });
+
+      callback = jasmine.createSpy('callback');
+      callback.and.returnValue(observableOf(undefined));
+      buildFromRequestUUIDSpy = spyOn(service, 'buildFromRequestUUID').and.callThrough();
+    });
+
+    it('should patch through href & followLinks to buildFromRequestUUID', () => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+      service.buildFromRequestUUIDAndAwait('some-href', callback, ...linksToFollow);
+      expect(buildFromRequestUUIDSpy).toHaveBeenCalledWith('some-href', ...linksToFollow);
+    });
+
+    it('should trigger the callback on successful RD', (done) => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+
+      service.buildFromRequestUUIDAndAwait('some-href', callback).subscribe(rd => {
+        expect(rd).toBe(MOCK_SUCCEEDED_RD);
+        expect(callback).toHaveBeenCalled();
+        done();
+      });
+    });
+
+    it('should trigger the callback on successful RD even if nothing subscribes to the returned Observable', fakeAsync(() => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+
+      service.buildFromRequestUUIDAndAwait('some-href', callback);
+      tick();
+
+      expect(callback).toHaveBeenCalled();
+    }));
+
+    it('should not trigger the callback on pending RD', (done) => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_PENDING_RD));
+
+      service.buildFromRequestUUIDAndAwait('some-href', callback).subscribe(rd => {
+        expect(rd).toBe(MOCK_PENDING_RD);
+        expect(callback).not.toHaveBeenCalled();
+        done();
+      });
+    });
+
+    it('should not trigger the callback on failed RD', (done) => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_FAILED_RD));
+
+      service.buildFromRequestUUIDAndAwait('some-href', callback).subscribe(rd => {
+        expect(rd).toBe(MOCK_FAILED_RD);
+        expect(callback).not.toHaveBeenCalled();
+        done();
+      });
+    });
+
+    it('should only emit after the callback is done', () => {
+      testScheduler.run(({ cold: tsCold, expectObservable }) => {
+        buildFromRequestUUIDSpy.and.returnValue(
+          tsCold('-p----s', RDs)
+        );
+        callback.and.returnValue(
+          tsCold('      --t', BOOLEAN)
+        );
+
+        const done$ = service.buildFromRequestUUIDAndAwait('some-href', callback);
+        expectObservable(done$).toBe(
+          '       -p------s', RDs       // resulting duration between pending & successful includes the callback
+        );
+      });
+    });
+  });
 });

src/app/core/cache/builders/remote-data-build.service.ts

@@ -1,11 +1,11 @@
 import { Injectable } from '@angular/core';
 import {
+  AsyncSubject,
   combineLatest as observableCombineLatest,
   Observable,
   of as observableOf,
-  race as observableRace
 } from 'rxjs';
-import { map, switchMap, filter, distinctUntilKeyChanged } from 'rxjs/operators';
+import { map, switchMap, filter, distinctUntilKeyChanged, startWith } from 'rxjs/operators';
 import { hasValue, isEmpty, isNotEmpty, hasNoValue, isUndefined } from '../../../shared/empty.util';
 import { createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
 import { FollowLinkConfig, followLink } from '../../../shared/utils/follow-link-config.model';
@@ -21,10 +21,11 @@ import { HALResource } from '../../shared/hal-resource.model';
 import { PAGINATED_LIST } from '../../data/paginated-list.resource-type';
 import { getUrlWithoutEmbedParams } from '../../index/index.selectors';
 import { getResourceTypeValueFor } from '../object-cache.reducer';
-import { hasSucceeded, RequestEntryState } from '../../data/request-entry-state.model';
+import { hasSucceeded, isStale, RequestEntryState } from '../../data/request-entry-state.model';
 import { getRequestFromRequestHref, getRequestFromRequestUUID } from '../../shared/request.operators';
 import { RequestEntry } from '../../data/request-entry.model';
 import { ResponseState } from '../../data/response-state.model';
+import { getFirstCompletedRemoteData } from '../../shared/operators';
 
 @Injectable()
 export class RemoteDataBuildService {
@@ -189,6 +190,49 @@ export class RemoteDataBuildService {
     return this.toRemoteDataObservable<T>(requestEntry$, payload$);
   }
 
+  /**
+   * Creates a {@link RemoteData} object for a rest request and its response
+   * and emits it only after the callback function is completed.
+   *
+   * @param requestUUID$    The UUID of the request we want to retrieve
+   * @param callback        A function that returns an Observable. It will only be called once the request has succeeded.
+   *                        Then, the response will only be emitted after this callback function has emitted.
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  buildFromRequestUUIDAndAwait<T>(requestUUID$: string | Observable<string>, callback: (rd?: RemoteData<T>) => Observable<unknown>, ...linksToFollow: FollowLinkConfig<any>[]): Observable<RemoteData<T>> {
+    const response$ = this.buildFromRequestUUID(requestUUID$, ...linksToFollow);
+
+    const callbackDone$ = new AsyncSubject<boolean>();
+    response$.pipe(
+      getFirstCompletedRemoteData(),
+      switchMap((rd: RemoteData<any>) => {
+        if (rd.hasSucceeded) {
+          // if the request succeeded, execute the callback
+          return callback(rd);
+        } else {
+          // otherwise, emit right away so the subscription doesn't stick around
+          return [true];
+        }
+      }),
+    ).subscribe(() => {
+      callbackDone$.next(true);
+      callbackDone$.complete();
+    });
+
+    return response$.pipe(
+      switchMap((rd: RemoteData<any>) => {
+        if (rd.hasSucceeded) {
+          // if the request succeeded, wait for the callback to finish
+          return callbackDone$.pipe(
+            map(() => rd),
+          );
+        } else {
+          return [rd];
+        }
+      })
+    );
+  }
+
   /**
    * Creates a {@link RemoteData} object for a rest request and its response
    *
@@ -207,10 +251,27 @@ export class RemoteDataBuildService {
         this.objectCache.getRequestUUIDBySelfLink(href)),
     );
 
-    const requestEntry$ = observableRace(
-      href$.pipe(getRequestFromRequestHref(this.requestService)),
-      requestUUID$.pipe(getRequestFromRequestUUID(this.requestService)),
-    ).pipe(
+    const requestEntry$ = observableCombineLatest([
+      href$.pipe(getRequestFromRequestHref(this.requestService), startWith(undefined)),
+      requestUUID$.pipe(getRequestFromRequestUUID(this.requestService), startWith(undefined)),
+    ]).pipe(
+      filter(([r1, r2]) => hasValue(r1) || hasValue(r2)),
+      map(([r1, r2]) => {
+        // If one of the two requests has no value, return the other (both is impossible due to the filter above)
+        if (hasNoValue(r2)) {
+          return r1;
+        } else if (hasNoValue(r1)) {
+          return r2;
+        }
+
+        if ((isStale(r1.state) && isStale(r2.state)) || (!isStale(r1.state) && !isStale(r2.state))) {
+          // Neither or both are stale, pick the most recent request
+          return r1.lastUpdated >= r2.lastUpdated ? r1 : r2;
+        } else {
+          // One of the two is stale, return the not stale request
+          return isStale(r2.state) ? r1 : r2;
+        }
+      }),
       distinctUntilKeyChanged('lastUpdated')
     );
 

src/app/core/config/config-data.service.spec.ts

@@ -1,7 +1,7 @@
 import { getTestScheduler } from 'jasmine-marbles';
 import { TestScheduler } from 'rxjs/testing';
 import { getMockRequestService } from '../../shared/mocks/request.service.mock';
-import { ConfigService } from './config.service';
+import { ConfigDataService } from './config-data.service';
 import { RequestService } from '../data/request.service';
 import { GetRequest } from '../data/request.models';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
@@ -9,23 +9,26 @@ import { HALEndpointServiceStub } from '../../shared/testing/hal-endpoint-servic
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { getMockRemoteDataBuildService } from '../../shared/mocks/remote-data-build.service.mock';
 import { FindListOptions } from '../data/find-list-options.model';
+import { ObjectCacheService } from '../cache/object-cache.service';
 
 const LINK_NAME = 'test';
 const BROWSE = 'search/findByCollection';
 
-class TestService extends ConfigService {
+class TestService extends ConfigDataService {
   protected linkPath = LINK_NAME;
   protected browseEndpoint = BROWSE;
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected halService: HALEndpointService) {
-    super(requestService, rdbService, null, null, halService, null, null, null, BROWSE);
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+  ) {
+    super(BROWSE, requestService, rdbService, objectCache, halService);
   }
 }
 
-describe('ConfigService', () => {
+describe('ConfigDataService', () => {
   let scheduler: TestScheduler;
   let service: TestService;
   let requestService: RequestService;
@@ -45,7 +48,8 @@ describe('ConfigService', () => {
     return new TestService(
       requestService,
       rdbService,
-      halService
+      null,
+      halService,
     );
   }
 

src/app/core/config/config-data.service.ts

@@ -0,0 +1,40 @@
+import { Observable } from 'rxjs';
+import { ConfigObject } from './models/config.model';
+import { RemoteData } from '../data/remote-data';
+import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
+import { getFirstCompletedRemoteData } from '../shared/operators';
+import { map } from 'rxjs/operators';
+import { BaseDataService } from '../data/base/base-data.service';
+
+/**
+ * Abstract data service to retrieve configuration objects from the REST server.
+ * Common logic for configuration objects should be implemented here.
+ */
+export abstract class ConfigDataService extends BaseDataService<ConfigObject> {
+  /**
+   * Returns an observable of {@link RemoteData} of an object, based on an href, with a list of
+   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * Throws an error if a configuration object cannot be retrieved.
+   *
+   * @param href                        The url of object we want to retrieve
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   */
+  public findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<ConfigObject>[]): Observable<RemoteData<ConfigObject>> {
+    return super.findByHref(href, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow).pipe(
+      getFirstCompletedRemoteData(),
+      map((rd: RemoteData<ConfigObject>) => {
+        if (rd.hasFailed) {
+          throw new Error(`Couldn't retrieve the config`);
+        } else {
+          return rd;
+        }
+      }),
+    );
+  }
+}

src/app/core/config/config.service.ts

@@ -1,67 +0,0 @@
-/* eslint-disable max-classes-per-file */
-import { Observable } from 'rxjs';
-import { RequestService } from '../data/request.service';
-import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { ConfigObject } from './models/config.model';
-import { RemoteData } from '../data/remote-data';
-import { DataService } from '../data/data.service';
-import { Store } from '@ngrx/store';
-import { ObjectCacheService } from '../cache/object-cache.service';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
-import { DefaultChangeAnalyzer } from '../data/default-change-analyzer.service';
-import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { getFirstCompletedRemoteData } from '../shared/operators';
-import { map } from 'rxjs/operators';
-import { CoreState } from '../core-state.model';
-
-class DataServiceImpl extends DataService<ConfigObject> {
-  constructor(
-    protected requestService: RequestService,
-    protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
-    protected objectCache: ObjectCacheService,
-    protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<ConfigObject>,
-    protected linkPath: string
-  ) {
-    super();
-  }
-}
-
-export abstract class ConfigService {
-  /**
-   * A private DataService instance to delegate specific methods to.
-   */
-  private dataService: DataServiceImpl;
-
-  constructor(
-    protected requestService: RequestService,
-    protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
-    protected objectCache: ObjectCacheService,
-    protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<ConfigObject>,
-    protected linkPath: string
-  ) {
-    this.dataService = new DataServiceImpl(requestService, rdbService, null, objectCache, halService, notificationsService, http, comparator, this.linkPath);
-  }
-
-  public findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<ConfigObject>[]): Observable<RemoteData<ConfigObject>> {
-    return this.dataService.findByHref(href, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow).pipe(
-      getFirstCompletedRemoteData(),
-      map((rd: RemoteData<ConfigObject>) => {
-        if (rd.hasFailed) {
-          throw new Error(`Couldn't retrieve the config`);
-        } else {
-          return rd;
-        }
-      })
-    );
-  }
-}

src/app/core/config/submission-accesses-config-data.service.ts

@@ -1,41 +1,46 @@
 import { Injectable } from '@angular/core';
-import { ConfigService } from './config.service';
+import { ConfigDataService } from './config-data.service';
 import { RequestService } from '../data/request.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
-import { dataService } from '../cache/builders/build-decorators';
 import { SUBMISSION_ACCESSES_TYPE } from './models/config-type';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { Store } from '@ngrx/store';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
-import { DefaultChangeAnalyzer } from '../data/default-change-analyzer.service';
 import { ConfigObject } from './models/config.model';
 import { SubmissionAccessesModel } from './models/config-submission-accesses.model';
 import { RemoteData } from '../data/remote-data';
 import { Observable } from 'rxjs';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { CoreState } from '../core-state.model';
+import { dataService } from '../data/base/data-service.decorator';
 
 /**
  * Provides methods to retrieve, from REST server, bitstream access conditions configurations applicable during the submission process.
  */
 @Injectable()
 @dataService(SUBMISSION_ACCESSES_TYPE)
-export class SubmissionAccessesConfigService extends ConfigService {
+export class SubmissionAccessesConfigDataService extends ConfigDataService {
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<SubmissionAccessesModel>
   ) {
-    super(requestService, rdbService, null, objectCache, halService, notificationsService, http, comparator, 'submissionaccessoptions');
+    super('submissionaccessoptions', requestService, rdbService, objectCache, halService);
   }
 
+  /**
+   * Returns an observable of {@link RemoteData} of an object, based on an href, with a list of
+   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * Throws an error if a configuration object cannot be retrieved.
+   *
+   * @param href                        The url of object we want to retrieve
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   */
   findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow): Observable<RemoteData<SubmissionAccessesModel>> {
     return super.findByHref(href, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow as FollowLinkConfig<ConfigObject>[]) as Observable<RemoteData<SubmissionAccessesModel>>;
   }

src/app/core/config/submission-forms-config-data.service.ts

@@ -1,39 +1,46 @@
 import { Injectable } from '@angular/core';
-
-import { ConfigService } from './config.service';
+import { ConfigDataService } from './config-data.service';
 import { RequestService } from '../data/request.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { Store } from '@ngrx/store';
 import { ObjectCacheService } from '../cache/object-cache.service';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
-import { DefaultChangeAnalyzer } from '../data/default-change-analyzer.service';
 import { ConfigObject } from './models/config.model';
-import { dataService } from '../cache/builders/build-decorators';
 import { SUBMISSION_FORMS_TYPE } from './models/config-type';
 import { SubmissionFormsModel } from './models/config-submission-forms.model';
 import { RemoteData } from '../data/remote-data';
 import { Observable } from 'rxjs';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { CoreState } from '../core-state.model';
+import { dataService } from '../data/base/data-service.decorator';
 
+/**
+ * Data service to retrieve submission form configuration objects from the REST server.
+ */
 @Injectable()
 @dataService(SUBMISSION_FORMS_TYPE)
-export class SubmissionFormsConfigService extends ConfigService {
+export class SubmissionFormsConfigDataService extends ConfigDataService {
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<SubmissionFormsModel>
   ) {
-    super(requestService, rdbService, null, objectCache, halService, notificationsService, http, comparator, 'submissionforms');
+    super('submissionforms', requestService, rdbService, objectCache, halService);
   }
 
+  /**
+   * Returns an observable of {@link RemoteData} of an object, based on an href, with a list of
+   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * Throws an error if a configuration object cannot be retrieved.
+   *
+   * @param href                        The url of object we want to retrieve
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   */
   public findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<SubmissionFormsModel>[]): Observable<RemoteData<SubmissionFormsModel>> {
     return super.findByHref(href, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow as FollowLinkConfig<ConfigObject>[]) as Observable<RemoteData<SubmissionFormsModel>>;
   }

src/app/core/config/submission-uploads-config-data.service.ts

@@ -1,39 +1,30 @@
 import { Injectable } from '@angular/core';
-import { ConfigService } from './config.service';
+import { ConfigDataService } from './config-data.service';
 import { RequestService } from '../data/request.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
-import { dataService } from '../cache/builders/build-decorators';
 import { SUBMISSION_UPLOADS_TYPE } from './models/config-type';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { Store } from '@ngrx/store';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
-import { DefaultChangeAnalyzer } from '../data/default-change-analyzer.service';
 import { ConfigObject } from './models/config.model';
 import { SubmissionUploadsModel } from './models/config-submission-uploads.model';
 import { RemoteData } from '../data/remote-data';
 import { Observable } from 'rxjs';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { CoreState } from '../core-state.model';
+import { dataService } from '../data/base/data-service.decorator';
 
 /**
  * Provides methods to retrieve, from REST server, bitstream access conditions configurations applicable during the submission process.
  */
 @Injectable()
 @dataService(SUBMISSION_UPLOADS_TYPE)
-export class SubmissionUploadsConfigService extends ConfigService {
+export class SubmissionUploadsConfigDataService extends ConfigDataService {
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<SubmissionUploadsModel>
   ) {
-    super(requestService, rdbService, null, objectCache, halService, notificationsService, http, comparator, 'submissionuploads');
+    super('submissionuploads', requestService, rdbService, objectCache, halService);
   }
 
   findByHref(href: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow): Observable<RemoteData<SubmissionUploadsModel>> {

src/app/core/core.module.ts

@@ -36,7 +36,7 @@ import { SubmissionDefinitionsModel } from './config/models/config-submission-de
 import { SubmissionFormsModel } from './config/models/config-submission-forms.model';
 import { SubmissionSectionModel } from './config/models/config-submission-section.model';
 import { SubmissionUploadsModel } from './config/models/config-submission-uploads.model';
-import { SubmissionFormsConfigService } from './config/submission-forms-config.service';
+import { SubmissionFormsConfigDataService } from './config/submission-forms-config-data.service';
 import { coreEffects } from './core.effects';
 import { coreReducers } from './core.reducers';
 import { BitstreamFormatDataService } from './data/bitstream-format-data.service';
@@ -49,8 +49,8 @@ import { DSOChangeAnalyzer } from './data/dso-change-analyzer.service';
 import { DSOResponseParsingService } from './data/dso-response-parsing.service';
 import { DSpaceObjectDataService } from './data/dspace-object-data.service';
 import { EndpointMapResponseParsingService } from './data/endpoint-map-response-parsing.service';
-import { EntityTypeService } from './data/entity-type.service';
-import { ExternalSourceService } from './data/external-source.service';
+import { EntityTypeDataService } from './data/entity-type-data.service';
+import { ExternalSourceDataService } from './data/external-source-data.service';
 import { FacetConfigResponseParsingService } from './data/facet-config-response-parsing.service';
 import { FacetValueResponseParsingService } from './data/facet-value-response-parsing.service';
 import { FilteredDiscoveryPageResponseParsingService } from './data/filtered-discovery-page-response-parsing.service';
@@ -58,9 +58,9 @@ import { ItemDataService } from './data/item-data.service';
 import { LookupRelationService } from './data/lookup-relation.service';
 import { MyDSpaceResponseParsingService } from './data/mydspace-response-parsing.service';
 import { ObjectUpdatesService } from './data/object-updates/object-updates.service';
-import { RelationshipTypeService } from './data/relationship-type.service';
-import { RelationshipService } from './data/relationship.service';
-import { ResourcePolicyService } from './resource-policy/resource-policy.service';
+import { RelationshipTypeDataService } from './data/relationship-type-data.service';
+import { RelationshipDataService } from './data/relationship-data.service';
+import { ResourcePolicyDataService } from './resource-policy/resource-policy-data.service';
 import { SearchResponseParsingService } from './data/search-response-parsing.service';
 import { SiteDataService } from './data/site-data.service';
 import { DspaceRestService } from './dspace-rest/dspace-rest.service';
@@ -170,14 +170,16 @@ import { SubmissionAccessesModel } from './config/models/config-submission-acces
 import { AccessStatusObject } from '../shared/object-list/access-status-badge/access-status.model';
 import { AccessStatusDataService } from './data/access-status-data.service';
 import { LinkHeadService } from './services/link-head.service';
-import { ResearcherProfileService } from './profile/researcher-profile.service';
+import { ResearcherProfileDataService } from './profile/researcher-profile-data.service';
 import { ProfileClaimService } from '../profile-page/profile-claim/profile-claim.service';
 import { ResearcherProfile } from './profile/model/researcher-profile.model';
-import { OrcidQueueService } from './orcid/orcid-queue.service';
+import { OrcidQueueDataService } from './orcid/orcid-queue-data.service';
 import { OrcidHistoryDataService } from './orcid/orcid-history-data.service';
 import { OrcidQueue } from './orcid/model/orcid-queue.model';
 import { OrcidHistory } from './orcid/model/orcid-history.model';
 import { OrcidAuthService } from './orcid/orcid-auth.service';
+import { VocabularyDataService } from './submission/vocabularies/vocabulary.data.service';
+import { VocabularyEntryDetailsDataService } from './submission/vocabularies/vocabulary-entry-details.data.service';
 
 /**
  * When not in production, endpoint responses can be mocked for testing purposes
@@ -223,7 +225,7 @@ const PROVIDERS = [
   MetadataService,
   ObjectCacheService,
   PaginationComponentOptions,
-  ResourcePolicyService,
+  ResourcePolicyDataService,
   RegistryService,
   BitstreamFormatDataService,
   RemoteDataBuildService,
@@ -238,7 +240,7 @@ const PROVIDERS = [
   AccessStatusDataService,
   SubmissionCcLicenseDataService,
   SubmissionCcLicenseUrlDataService,
-  SubmissionFormsConfigService,
+  SubmissionFormsConfigDataService,
   SubmissionRestService,
   SubmissionResponseParsingService,
   SubmissionJsonPatchOperationsService,
@@ -259,7 +261,7 @@ const PROVIDERS = [
   MenuService,
   ObjectUpdatesService,
   SearchService,
-  RelationshipService,
+  RelationshipDataService,
   MyDSpaceGuard,
   RoleService,
   TaskResponseParsingService,
@@ -267,7 +269,7 @@ const PROVIDERS = [
   PoolTaskDataService,
   BitstreamDataService,
   DsDynamicTypeBindRelationService,
-  EntityTypeService,
+  EntityTypeDataService,
   ContentSourceResponseParsingService,
   ItemTemplateDataService,
   SearchService,
@@ -276,8 +278,8 @@ const PROVIDERS = [
   SearchFilterService,
   SearchConfigurationService,
   SelectableListService,
-  RelationshipTypeService,
-  ExternalSourceService,
+  RelationshipTypeDataService,
+  ExternalSourceDataService,
   LookupRelationService,
   VersionDataService,
   VersionHistoryDataService,
@@ -300,14 +302,16 @@ const PROVIDERS = [
   FilteredDiscoveryPageResponseParsingService,
   { provide: NativeWindowService, useFactory: NativeWindowFactory },
   VocabularyService,
+  VocabularyDataService,
+  VocabularyEntryDetailsDataService,
   VocabularyTreeviewService,
   SequenceService,
   GroupDataService,
   FeedbackDataService,
-  ResearcherProfileService,
+  ResearcherProfileDataService,
   ProfileClaimService,
   OrcidAuthService,
-  OrcidQueueService,
+  OrcidQueueDataService,
   OrcidHistoryDataService,
 ];
 

src/app/core/data/access-status-data.service.spec.ts

@@ -76,6 +76,6 @@ describe('AccessStatusDataService', () => {
     });
     halService = new HALEndpointServiceStub(url);
     notificationsService = new NotificationsServiceStub();
-    service = new AccessStatusDataService(null, halService, null, notificationsService, objectCache, rdbService, requestService, null);
+    service = new AccessStatusDataService(requestService, rdbService, objectCache, halService);
   }
 });

src/app/core/data/access-status-data.service.ts

@@ -1,38 +1,30 @@
-import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Store } from '@ngrx/store';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { DataService } from './data.service';
 import { RequestService } from './request.service';
-import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
-import { CoreState } from '../core-state.model';
 import { AccessStatusObject } from 'src/app/shared/object-list/access-status-badge/access-status.model';
 import { ACCESS_STATUS } from 'src/app/shared/object-list/access-status-badge/access-status.resource-type';
 import { Observable } from 'rxjs';
 import { RemoteData } from './remote-data';
 import { Item } from '../shared/item.model';
+import { BaseDataService } from './base/base-data.service';
+import { dataService } from './base/data-service.decorator';
 
+/**
+ * Data service responsible for retrieving the access status of Items
+ */
 @Injectable()
 @dataService(ACCESS_STATUS)
-export class AccessStatusDataService extends DataService<AccessStatusObject> {
-
-  protected linkPath = 'accessStatus';
+export class AccessStatusDataService extends BaseDataService<AccessStatusObject> {
 
   constructor(
-    protected comparator: DefaultChangeAnalyzer<AccessStatusObject>,
-    protected halService: HALEndpointService,
-    protected http: HttpClient,
-    protected notificationsService: NotificationsService,
-    protected objectCache: ObjectCacheService,
-    protected rdbService: RemoteDataBuildService,
     protected requestService: RequestService,
-    protected store: Store<CoreState>,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
   ) {
-    super();
+    super('accessStatus', requestService, rdbService, objectCache, halService);
   }
 
   /**

src/app/core/data/base/base-data.service.spec.ts

@@ -1,54 +1,38 @@
-/* eslint-disable max-classes-per-file */
-import { HttpClient } from '@angular/common/http';
-import { Store } from '@ngrx/store';
-import { compare, Operation } from 'fast-json-patch';
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { FindListOptions } from '../find-list-options.model';
 import { Observable, of as observableOf } from 'rxjs';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { followLink } from '../../shared/utils/follow-link-config.model';
-import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { SortDirection, SortOptions } from '../cache/models/sort-options.model';
-import { ObjectCacheService } from '../cache/object-cache.service';
-import { DSpaceObject } from '../shared/dspace-object.model';
-import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { Item } from '../shared/item.model';
-import {
-  createFailedRemoteDataObject,
-  createSuccessfulRemoteDataObject,
-  createSuccessfulRemoteDataObject$,
-} from '../../shared/remote-data.utils';
-import { ChangeAnalyzer } from './change-analyzer';
-import { DataService } from './data.service';
-import { PatchRequest } from './request.models';
-import { RequestService } from './request.service';
-import { getMockRequestService } from '../../shared/mocks/request.service.mock';
-import { HALEndpointServiceStub } from '../../shared/testing/hal-endpoint-service.stub';
-import { RequestParam } from '../cache/models/request-param.model';
-import { getMockRemoteDataBuildService } from '../../shared/mocks/remote-data-build.service.mock';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
 import { TestScheduler } from 'rxjs/testing';
-import { RemoteData } from './remote-data';
-import { RequestEntryState } from './request-entry-state.model';
-import { CoreState } from '../core-state.model';
-import { FindListOptions } from './find-list-options.model';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
 import { fakeAsync, tick } from '@angular/core/testing';
+import { BaseDataService } from './base-data.service';
 
 const endpoint = 'https://rest.api/core';
 
 const BOOLEAN = { f: false, t: true };
 
-class TestService extends DataService<any> {
-
+class TestService extends BaseDataService<any> {
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
-    protected linkPath: string,
-    protected halService: HALEndpointService,
     protected objectCache: ObjectCacheService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: ChangeAnalyzer<Item>
+    protected halService: HALEndpointService,
   ) {
-    super();
+    super(undefined, requestService, rdbService, objectCache, halService);
   }
 
   public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
@@ -56,24 +40,12 @@ class TestService extends DataService<any> {
   }
 }
 
-class DummyChangeAnalyzer implements ChangeAnalyzer<Item> {
-  diff(object1: Item, object2: Item): Operation[] {
-    return compare((object1 as any).metadata, (object2 as any).metadata);
-  }
-
-}
-
-describe('DataService', () => {
+describe('BaseDataService', () => {
   let service: TestService;
-  let options: FindListOptions;
   let requestService;
   let halService;
   let rdbService;
-  let notificationsService;
-  let http;
-  let comparator;
   let objectCache;
-  let store;
   let selfLink;
   let linksToFollow;
   let testScheduler;
@@ -83,9 +55,6 @@ describe('DataService', () => {
     requestService = getMockRequestService();
     halService = new HALEndpointServiceStub('url') as any;
     rdbService = getMockRemoteDataBuildService();
-    notificationsService = {} as NotificationsService;
-    http = {} as HttpClient;
-    comparator = new DummyChangeAnalyzer() as any;
     objectCache = {
 
       addPatch: () => {
@@ -98,7 +67,6 @@ describe('DataService', () => {
         /* empty */
       }
     } as any;
-    store = {} as Store<CoreState>;
     selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
     linksToFollow = [
       followLink('a'),
@@ -126,17 +94,11 @@ describe('DataService', () => {
       ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
     };
 
-
     return new TestService(
       requestService,
       rdbService,
-      store,
-      endpoint,
-      halService,
       objectCache,
-      notificationsService,
-      http,
-      comparator,
+      halService,
     );
   }
 
@@ -144,259 +106,6 @@ describe('DataService', () => {
     service = initTestService();
   });
 
-  describe('getFindAllHref', () => {
-
-    it('should return an observable with the endpoint', () => {
-      options = {};
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-          expect(value).toBe(endpoint);
-        }
-      );
-    });
-
-    it('should include page in href if currentPage provided in options', () => {
-      options = { currentPage: 2 };
-      const expected = `${endpoint}?page=${options.currentPage - 1}`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include size in href if elementsPerPage provided in options', () => {
-      options = { elementsPerPage: 5 };
-      const expected = `${endpoint}?size=${options.elementsPerPage}`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include sort href if SortOptions provided in options', () => {
-      const sortOptions = new SortOptions('field1', SortDirection.ASC);
-      options = { sort: sortOptions };
-      const expected = `${endpoint}?sort=${sortOptions.field},${sortOptions.direction}`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include startsWith in href if startsWith provided in options', () => {
-      options = { startsWith: 'ab' };
-      const expected = `${endpoint}?startsWith=${options.startsWith}`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include all provided options in href', () => {
-      const sortOptions = new SortOptions('field1', SortDirection.DESC);
-      options = {
-        currentPage: 6,
-        elementsPerPage: 10,
-        sort: sortOptions,
-        startsWith: 'ab',
-
-      };
-      const expected = `${endpoint}?page=${options.currentPage - 1}&size=${options.elementsPerPage}` +
-        `&sort=${sortOptions.field},${sortOptions.direction}&startsWith=${options.startsWith}`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include all searchParams in href if any provided in options', () => {
-      options = {
-        searchParams: [
-          new RequestParam('param1', 'test'),
-          new RequestParam('param2', 'test2'),
-        ]
-      };
-      const expected = `${endpoint}?param1=test&param2=test2`;
-
-      (service as any).getFindAllHref(options).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include linkPath in href if any provided', () => {
-      const expected = `${endpoint}/test/entries`;
-
-      (service as any).getFindAllHref({}, 'test/entries').subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include single linksToFollow as embed', () => {
-      const expected = `${endpoint}?embed=bundles`;
-
-      (service as any).getFindAllHref({}, null, followLink('bundles')).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include single linksToFollow as embed and its size', () => {
-      const expected = `${endpoint}?embed.size=bundles=5&embed=bundles`;
-      const config: FindListOptions = Object.assign(new FindListOptions(), {
-        elementsPerPage: 5
-      });
-      (service as any).getFindAllHref({}, null, followLink('bundles', { findListOptions: config })).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include multiple linksToFollow as embed', () => {
-      const expected = `${endpoint}?embed=bundles&embed=owningCollection&embed=templateItemOf`;
-
-      (service as any).getFindAllHref({}, null, followLink('bundles'), followLink('owningCollection'), followLink('templateItemOf')).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include multiple linksToFollow as embed and its sizes if given', () => {
-      const expected = `${endpoint}?embed=bundles&embed.size=owningCollection=2&embed=owningCollection&embed=templateItemOf`;
-
-      const config: FindListOptions = Object.assign(new FindListOptions(), {
-        elementsPerPage: 2
-      });
-
-      (service as any).getFindAllHref({}, null, followLink('bundles'), followLink('owningCollection', { findListOptions: config }), followLink('templateItemOf')).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should not include linksToFollow with shouldEmbed = false', () => {
-      const expected = `${endpoint}?embed=templateItemOf`;
-
-      (service as any).getFindAllHref(
-        {},
-        null,
-        followLink('bundles', { shouldEmbed: false }),
-        followLink('owningCollection', { shouldEmbed: false }),
-        followLink('templateItemOf')
-      ).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include nested linksToFollow 3lvl', () => {
-      const expected = `${endpoint}?embed=owningCollection/itemtemplate/relationships`;
-
-      (service as any).getFindAllHref({}, null, followLink('owningCollection', {}, followLink('itemtemplate', {}, followLink('relationships')))).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-
-    it('should include nested linksToFollow 2lvl and nested embed\'s size', () => {
-      const expected = `${endpoint}?embed.size=owningCollection/itemtemplate=4&embed=owningCollection/itemtemplate`;
-      const config: FindListOptions = Object.assign(new FindListOptions(), {
-        elementsPerPage: 4
-      });
-      (service as any).getFindAllHref({}, null, followLink('owningCollection', {}, followLink('itemtemplate', { findListOptions: config }))).subscribe((value) => {
-        expect(value).toBe(expected);
-      });
-    });
-  });
-
-  describe('getIDHref', () => {
-    const endpointMock = 'https://dspace7-internal.atmire.com/server/api/core/items';
-    const resourceIdMock = '003c99b4-d4fe-44b0-a945-e12182a7ca89';
-
-    it('should return endpoint', () => {
-      const result = (service as any).getIDHref(endpointMock, resourceIdMock);
-      expect(result).toEqual(endpointMock + '/' + resourceIdMock);
-    });
-
-    it('should include single linksToFollow as embed', () => {
-      const expected = `${endpointMock}/${resourceIdMock}?embed=bundles`;
-      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('bundles'));
-      expect(result).toEqual(expected);
-    });
-
-    it('should include multiple linksToFollow as embed', () => {
-      const expected = `${endpointMock}/${resourceIdMock}?embed=bundles&embed=owningCollection&embed=templateItemOf`;
-      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('bundles'), followLink('owningCollection'), followLink('templateItemOf'));
-      expect(result).toEqual(expected);
-    });
-
-    it('should not include linksToFollow with shouldEmbed = false', () => {
-      const expected = `${endpointMock}/${resourceIdMock}?embed=templateItemOf`;
-      const result = (service as any).getIDHref(
-        endpointMock,
-        resourceIdMock,
-        followLink('bundles', { shouldEmbed: false }),
-        followLink('owningCollection', { shouldEmbed: false }),
-        followLink('templateItemOf')
-      );
-      expect(result).toEqual(expected);
-    });
-
-    it('should include nested linksToFollow 3lvl', () => {
-      const expected = `${endpointMock}/${resourceIdMock}?embed=owningCollection/itemtemplate/relationships`;
-      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('owningCollection', {}, followLink('itemtemplate', {}, followLink('relationships'))));
-      expect(result).toEqual(expected);
-    });
-  });
-
-  describe('patch', () => {
-    const dso = {
-      uuid: 'dso-uuid'
-    };
-    const operations = [
-      Object.assign({
-        op: 'move',
-        from: '/1',
-        path: '/5'
-      }) as Operation
-    ];
-
-    beforeEach(() => {
-      service.patch(dso, operations);
-    });
-
-    it('should send a PatchRequest', () => {
-      expect(requestService.send).toHaveBeenCalledWith(jasmine.any(PatchRequest));
-    });
-  });
-
-  describe('update', () => {
-    let operations;
-    let dso;
-    let dso2;
-    const name1 = 'random string';
-    const name2 = 'another random string';
-    beforeEach(() => {
-      operations = [{ op: 'replace', path: '/0/value', value: name2 } as Operation];
-
-      dso = Object.assign(new DSpaceObject(), {
-        _links: { self: { href: selfLink } },
-        metadata: [{ key: 'dc.title', value: name1 }]
-      });
-
-      dso2 = Object.assign(new DSpaceObject(), {
-        _links: { self: { href: selfLink } },
-        metadata: [{ key: 'dc.title', value: name2 }]
-      });
-
-      spyOn(service, 'findByHref').and.returnValue(createSuccessfulRemoteDataObject$(dso));
-      spyOn(objectCache, 'addPatch');
-    });
-
-    it('should call addPatch on the object cache with the right parameters when there are differences', () => {
-      service.update(dso2).subscribe();
-      expect(objectCache.addPatch).toHaveBeenCalledWith(selfLink, operations);
-    });
-
-    it('should not call addPatch on the object cache with the right parameters when there are no differences', () => {
-      service.update(dso).subscribe();
-      expect(objectCache.addPatch).not.toHaveBeenCalled();
-    });
-  });
-
   describe(`reRequestStaleRemoteData`, () => {
     let callback: jasmine.Spy<jasmine.Func>;
 
@@ -661,7 +370,7 @@ describe('DataService', () => {
 
   });
 
-  describe(`findAllByHref`, () => {
+  describe(`findListByHref`, () => {
     let findListOptions;
     beforeEach(() => {
       findListOptions = { currentPage: 5 };
@@ -674,7 +383,7 @@ describe('DataService', () => {
         spyOn(rdbService, 'buildList').and.returnValue(cold('a', { a: remoteDataMocks.Success }));
         spyOn(service as any, 'reRequestStaleRemoteData').and.returnValue(() => cold('a', { a: remoteDataMocks.Success }));
 
-        service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow);
+        service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow);
         expect(service.buildHrefFromFindOptions).toHaveBeenCalledWith(selfLink, findListOptions, [], ...linksToFollow);
       });
     });
@@ -685,11 +394,11 @@ describe('DataService', () => {
         spyOn(rdbService, 'buildList').and.returnValue(cold('a', { a: remoteDataMocks.Success }));
         spyOn(service as any, 'reRequestStaleRemoteData').and.returnValue(() => cold('a', { a: remoteDataMocks.Success }));
 
-        service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow);
+        service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow);
         expect((service as any).createAndSendGetRequest).toHaveBeenCalledWith(jasmine.anything(), true);
         expectObservable(rdbService.buildList.calls.argsFor(0)[0]).toBe('(a|)', { a: 'bingo!' });
 
-        service.findAllByHref(selfLink, findListOptions, false, true, ...linksToFollow);
+        service.findListByHref(selfLink, findListOptions, false, true, ...linksToFollow);
         expect((service as any).createAndSendGetRequest).toHaveBeenCalledWith(jasmine.anything(), false);
         expectObservable(rdbService.buildList.calls.argsFor(1)[0]).toBe('(a|)', { a: 'bingo!' });
       });
@@ -701,29 +410,29 @@ describe('DataService', () => {
         spyOn(rdbService, 'buildList').and.returnValue(cold('a', { a: remoteDataMocks.Success }));
         spyOn(service as any, 'reRequestStaleRemoteData').and.returnValue(() => cold('a', { a: remoteDataMocks.Success }));
 
-        service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow);
+        service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow);
         expect(rdbService.buildList).toHaveBeenCalledWith(jasmine.anything() as any, ...linksToFollow);
         expectObservable(rdbService.buildList.calls.argsFor(0)[0]).toBe('(a|)', { a: 'bingo!' });
       });
     });
 
-    it(`should call reRequestStaleRemoteData with reRequestOnStale and the exact same findAllByHref call as a callback`, () => {
+    it(`should call reRequestStaleRemoteData with reRequestOnStale and the exact same findListByHref call as a callback`, () => {
       testScheduler.run(({ cold, expectObservable }) => {
         spyOn(service, 'buildHrefFromFindOptions').and.returnValue('bingo!');
         spyOn(rdbService, 'buildList').and.returnValue(cold('a', { a: remoteDataMocks.SuccessStale }));
         spyOn(service as any, 'reRequestStaleRemoteData').and.returnValue(() => cold('a', { a: remoteDataMocks.SuccessStale }));
 
-        service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow);
+        service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow);
         expect((service as any).reRequestStaleRemoteData.calls.argsFor(0)[0]).toBeTrue();
-        spyOn(service, 'findAllByHref').and.returnValue(cold('a', { a: remoteDataMocks.SuccessStale }));
+        spyOn(service, 'findListByHref').and.returnValue(cold('a', { a: remoteDataMocks.SuccessStale }));
         // prove that the spy we just added hasn't been called yet
-        expect(service.findAllByHref).not.toHaveBeenCalled();
+        expect(service.findListByHref).not.toHaveBeenCalled();
         // call the callback passed to reRequestStaleRemoteData
         (service as any).reRequestStaleRemoteData.calls.argsFor(0)[1]();
-        // verify that findAllByHref _has_ been called now, with the same params as the original call
-        expect(service.findAllByHref).toHaveBeenCalledWith(jasmine.anything(), findListOptions, true, true, ...linksToFollow);
+        // verify that findListByHref _has_ been called now, with the same params as the original call
+        expect(service.findListByHref).toHaveBeenCalledWith(jasmine.anything(), findListOptions, true, true, ...linksToFollow);
         // ... except for selflink, which will have been turned in to an observable.
-        expectObservable((service.findAllByHref as jasmine.Spy).calls.argsFor(0)[0]).toBe('(a|)', { a: selfLink });
+        expectObservable((service.findListByHref as jasmine.Spy).calls.argsFor(0)[0]).toBe('(a|)', { a: selfLink });
       });
     });
 
@@ -737,7 +446,7 @@ describe('DataService', () => {
           a: 'bingo!',
         };
 
-        expectObservable(service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
+        expectObservable(service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
       });
     });
 
@@ -765,7 +474,7 @@ describe('DataService', () => {
             e: remoteDataMocks.SuccessStale,
           };
 
-          expectObservable(service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
+          expectObservable(service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
         });
       });
 
@@ -786,7 +495,7 @@ describe('DataService', () => {
             e: remoteDataMocks.SuccessStale,
           };
 
-          expectObservable(service.findAllByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
+          expectObservable(service.findListByHref(selfLink, findListOptions, true, true, ...linksToFollow)).toBe(expected, values);
         });
       });
 
@@ -816,7 +525,7 @@ describe('DataService', () => {
             e: remoteDataMocks.SuccessStale,
           };
 
-          expectObservable(service.findAllByHref(selfLink, findListOptions, false, true, ...linksToFollow)).toBe(expected, values);
+          expectObservable(service.findListByHref(selfLink, findListOptions, false, true, ...linksToFollow)).toBe(expected, values);
         });
       });
 
@@ -837,7 +546,7 @@ describe('DataService', () => {
             e: remoteDataMocks.SuccessStale,
           };
 
-          expectObservable(service.findAllByHref(selfLink, findListOptions, false, true, ...linksToFollow)).toBe(expected, values);
+          expectObservable(service.findListByHref(selfLink, findListOptions, false, true, ...linksToFollow)).toBe(expected, values);
         });
       });
 
@@ -915,97 +624,4 @@ describe('DataService', () => {
       });
     });
   });
-
-  describe('delete', () => {
-    let MOCK_SUCCEEDED_RD;
-    let MOCK_FAILED_RD;
-
-    let invalidateByHrefSpy: jasmine.Spy;
-    let buildFromRequestUUIDSpy: jasmine.Spy;
-    let getIDHrefObsSpy: jasmine.Spy;
-    let deleteByHrefSpy: jasmine.Spy;
-
-    beforeEach(() => {
-      invalidateByHrefSpy = spyOn(service, 'invalidateByHref').and.returnValue(observableOf(true));
-      buildFromRequestUUIDSpy = spyOn(rdbService, 'buildFromRequestUUID').and.callThrough();
-      getIDHrefObsSpy = spyOn(service, 'getIDHrefObs').and.callThrough();
-      deleteByHrefSpy = spyOn(service, 'deleteByHref').and.callThrough();
-
-      MOCK_SUCCEEDED_RD = createSuccessfulRemoteDataObject({});
-      MOCK_FAILED_RD = createFailedRemoteDataObject('something went wrong');
-    });
-
-    it('should retrieve href by ID and call deleteByHref', () => {
-      getIDHrefObsSpy.and.returnValue(observableOf('some-href'));
-      buildFromRequestUUIDSpy.and.returnValue(createSuccessfulRemoteDataObject$({}));
-
-      service.delete('some-id', ['a', 'b', 'c']).subscribe(rd => {
-        expect(getIDHrefObsSpy).toHaveBeenCalledWith('some-id');
-        expect(deleteByHrefSpy).toHaveBeenCalledWith('some-href', ['a', 'b', 'c']);
-      });
-    });
-
-    describe('deleteByHref', () => {
-      it('should call invalidateByHref if the DELETE request succeeds', (done) => {
-        buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
-
-        service.deleteByHref('some-href').subscribe(rd => {
-          expect(rd).toBe(MOCK_SUCCEEDED_RD);
-          expect(invalidateByHrefSpy).toHaveBeenCalled();
-          done();
-        });
-      });
-
-      it('should call invalidateByHref even if not subscribing to returned Observable', fakeAsync(() => {
-        buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
-
-        service.deleteByHref('some-href');
-        tick();
-
-        expect(invalidateByHrefSpy).toHaveBeenCalled();
-      }));
-
-      it('should not call invalidateByHref if the DELETE request fails', (done) => {
-        buildFromRequestUUIDSpy.and.returnValue(observableOf(MOCK_FAILED_RD));
-
-        service.deleteByHref('some-href').subscribe(rd => {
-          expect(rd).toBe(MOCK_FAILED_RD);
-          expect(invalidateByHrefSpy).not.toHaveBeenCalled();
-          done();
-        });
-      });
-
-      it('should wait for invalidateByHref before emitting', () => {
-        testScheduler.run(({ cold, expectObservable }) => {
-          buildFromRequestUUIDSpy.and.returnValue(
-            cold('(r|)', { r: MOCK_SUCCEEDED_RD})      // RD emits right away
-          );
-          invalidateByHrefSpy.and.returnValue(
-            cold('----(t|)', BOOLEAN)                  // but we pretend that setting requests to stale takes longer
-          );
-
-          const done$ = service.deleteByHref('some-href');
-          expectObservable(done$).toBe(
-            '----(r|)', { r: MOCK_SUCCEEDED_RD}        // ...and expect the returned Observable to wait until that's done
-          );
-        });
-      });
-
-      it('should wait for the DELETE request to resolve before emitting', () => {
-        testScheduler.run(({ cold, expectObservable }) => {
-          buildFromRequestUUIDSpy.and.returnValue(
-            cold('----(r|)', { r: MOCK_SUCCEEDED_RD})   // the request takes a while
-          );
-          invalidateByHrefSpy.and.returnValue(
-            cold('(t|)', BOOLEAN)                       // but we pretend that setting to stale happens sooner
-          );                                            // e.g.: maybe already stale before this call?
-
-          const done$ = service.deleteByHref('some-href');
-          expectObservable(done$).toBe(
-            '----(r|)', { r: MOCK_SUCCEEDED_RD}         // ...and expect the returned Observable to wait for the request
-          );
-        });
-      });
-    });
-  });
 });

src/app/core/data/base/base-data.service.ts

@@ -0,0 +1,374 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+
+import { AsyncSubject, from as observableFrom, Observable, of as observableOf } from 'rxjs';
+import { map, mergeMap, skipWhile, switchMap, take, tap, toArray } from 'rxjs/operators';
+import { hasValue, isNotEmpty, isNotEmptyOperator } from '../../../shared/empty.util';
+import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { RequestParam } from '../../cache/models/request-param.model';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { URLCombiner } from '../../url-combiner/url-combiner';
+import { RemoteData } from '../remote-data';
+import { GetRequest } from '../request.models';
+import { RequestService } from '../request.service';
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { FindListOptions } from '../find-list-options.model';
+import { PaginatedList } from '../paginated-list.model';
+import { ObjectCacheEntry } from '../../cache/object-cache.reducer';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALDataService } from './hal-data-service.interface';
+
+/**
+ * Common functionality for data services.
+ * Specific functionality that not all services would need
+ * is implemented in "DataService feature" classes (e.g. {@link CreateData}
+ *
+ * All DataService (or DataService feature) classes must
+ *   - extend this class (or {@link IdentifiableDataService})
+ *   - implement any DataService features it requires in order to forward calls to it
+ *
+ * ```
+ * export class SomeDataService extends BaseDataService<Something> implements CreateData<Something>, SearchData<Something> {
+ *   private createData: CreateData<Something>;
+ *   private searchData: SearchDataData<Something>;
+ *
+ *   create(...) {
+ *     return this.createData.create(...);
+ *   }
+ *
+ *   searchBy(...) {
+ *     return this.searchData.searchBy(...);
+ *   }
+ * }
+ * ```
+ */
+export class BaseDataService<T extends CacheableObject> implements HALDataService<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected responseMsToLive?: number,
+  ) {
+  }
+
+  /**
+   * Allows subclasses to reset the response cache time.
+   */
+
+  /**
+   * Get the endpoint for browsing
+   * @param options The [[FindListOptions]] object
+   * @param linkPath The link path for the object
+   * @returns {Observable<string>}
+   */
+  getBrowseEndpoint(options: FindListOptions = {}, linkPath?: string): Observable<string> {
+    return this.getEndpoint();
+  }
+
+  /**
+   * Get the base endpoint for all requests
+   */
+  protected getEndpoint(): Observable<string> {
+    return this.halService.getEndpoint(this.linkPath);
+  }
+
+  /**
+   * Turn an options object into a query string and combine it with the given HREF
+   *
+   * @param href The HREF to which the query string should be appended
+   * @param options The [[FindListOptions]] object
+   * @param extraArgs Array with additional params to combine with query string
+   * @return {Observable<string>}
+   *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  public buildHrefFromFindOptions(href: string, options: FindListOptions, extraArgs: string[] = [], ...linksToFollow: FollowLinkConfig<T>[]): string {
+    let args = [...extraArgs];
+
+    if (hasValue(options.currentPage) && typeof options.currentPage === 'number') {
+      /* TODO: this is a temporary fix for the pagination start index (0 or 1) discrepancy between the rest and the frontend respectively */
+      args = this.addHrefArg(href, args, `page=${options.currentPage - 1}`);
+    }
+    if (hasValue(options.elementsPerPage)) {
+      args = this.addHrefArg(href, args, `size=${options.elementsPerPage}`);
+    }
+    if (hasValue(options.sort)) {
+      args = this.addHrefArg(href, args, `sort=${options.sort.field},${options.sort.direction}`);
+    }
+    if (hasValue(options.startsWith)) {
+      args = this.addHrefArg(href, args, `startsWith=${options.startsWith}`);
+    }
+    if (hasValue(options.searchParams)) {
+      options.searchParams.forEach((param: RequestParam) => {
+        args = this.addHrefArg(href, args, `${param.fieldName}=${param.fieldValue}`);
+      });
+    }
+    args = this.addEmbedParams(href, args, ...linksToFollow);
+    if (isNotEmpty(args)) {
+      return new URLCombiner(href, `?${args.join('&')}`).toString();
+    } else {
+      return href;
+    }
+  }
+
+  /**
+   * Turn an array of RequestParam into a query string and combine it with the given HREF
+   *
+   * @param href The HREF to which the query string should be appended
+   * @param params Array with additional params to combine with query string
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   *
+   * @return {Observable<string>}
+   * Return an observable that emits created HREF
+   */
+  buildHrefWithParams(href: string, params: RequestParam[], ...linksToFollow: FollowLinkConfig<T>[]): string {
+
+    let  args = [];
+    if (hasValue(params)) {
+      params.forEach((param: RequestParam) => {
+        args = this.addHrefArg(href, args, `${param.fieldName}=${param.fieldValue}`);
+      });
+    }
+
+    args = this.addEmbedParams(href, args, ...linksToFollow);
+
+    if (isNotEmpty(args)) {
+      return new URLCombiner(href, `?${args.join('&')}`).toString();
+    } else {
+      return href;
+    }
+  }
+  /**
+   * Adds the embed options to the link for the request
+   * @param href            The href the params are to be added to
+   * @param args            params for the query string
+   * @param linksToFollow   links we want to embed in query string if shouldEmbed is true
+   */
+  protected addEmbedParams(href: string, args: string[], ...linksToFollow: FollowLinkConfig<T>[]) {
+    linksToFollow.forEach((linkToFollow: FollowLinkConfig<T>) => {
+      if (hasValue(linkToFollow) && linkToFollow.shouldEmbed) {
+        const embedString = 'embed=' + String(linkToFollow.name);
+        // Add the embeds size if given in the FollowLinkConfig.FindListOptions
+        if (hasValue(linkToFollow.findListOptions) && hasValue(linkToFollow.findListOptions.elementsPerPage)) {
+          args = this.addHrefArg(href, args,
+            'embed.size=' + String(linkToFollow.name) + '=' + linkToFollow.findListOptions.elementsPerPage);
+        }
+        // Adds the nested embeds and their size if given
+        if (isNotEmpty(linkToFollow.linksToFollow)) {
+          args = this.addNestedEmbeds(embedString, href, args, ...linkToFollow.linksToFollow);
+        } else {
+          args = this.addHrefArg(href, args, embedString);
+        }
+      }
+    });
+    return args;
+  }
+
+  /**
+   * Add a new argument to the list of arguments, only if it doesn't already exist in the given href,
+   * or the current list of arguments
+   *
+   * @param href        The href the arguments are to be added to
+   * @param currentArgs The current list of arguments
+   * @param newArg      The new argument to add
+   * @return            The next list of arguments, with newArg included if it wasn't already.
+   *                    Note this function will not modify any of the input params.
+   */
+  protected addHrefArg(href: string, currentArgs: string[], newArg: string): string[] {
+    if (href.includes(newArg) || currentArgs.includes(newArg)) {
+      return [...currentArgs];
+    } else {
+      return [...currentArgs, newArg];
+    }
+  }
+
+  /**
+   * Add the nested followLinks to the embed param, separated by a /, and their sizes, recursively
+   * @param embedString     embedString so far (recursive)
+   * @param href            The href the params are to be added to
+   * @param args            params for the query string
+   * @param linksToFollow   links we want to embed in query string if shouldEmbed is true
+   */
+  protected addNestedEmbeds(embedString: string, href: string, args: string[], ...linksToFollow: FollowLinkConfig<T>[]): string[] {
+    let nestEmbed = embedString;
+    linksToFollow.forEach((linkToFollow: FollowLinkConfig<T>) => {
+      if (hasValue(linkToFollow) && linkToFollow.shouldEmbed) {
+        nestEmbed = nestEmbed + '/' + String(linkToFollow.name);
+        // Add the nested embeds size if given in the FollowLinkConfig.FindListOptions
+        if (hasValue(linkToFollow.findListOptions) && hasValue(linkToFollow.findListOptions.elementsPerPage)) {
+          const nestedEmbedSize = 'embed.size=' + nestEmbed.split('=')[1] + '=' + linkToFollow.findListOptions.elementsPerPage;
+          args = this.addHrefArg(href, args, nestedEmbedSize);
+        }
+        if (hasValue(linkToFollow.linksToFollow) && isNotEmpty(linkToFollow.linksToFollow)) {
+          args = this.addNestedEmbeds(nestEmbed, href, args, ...linkToFollow.linksToFollow);
+        } else {
+          args = this.addHrefArg(href, args, nestEmbed);
+        }
+      }
+    });
+    return args;
+  }
+
+  /**
+   * An operator that will call the given function if the incoming RemoteData is stale and
+   * shouldReRequest is true
+   *
+   * @param shouldReRequest  Whether or not to call the re-request function if the RemoteData is stale
+   * @param requestFn        The function to call if the RemoteData is stale and shouldReRequest is
+   *                         true
+   */
+  protected reRequestStaleRemoteData<O>(shouldReRequest: boolean, requestFn: () => Observable<RemoteData<O>>) {
+    return (source: Observable<RemoteData<O>>): Observable<RemoteData<O>> => {
+      if (shouldReRequest === true) {
+        return source.pipe(
+          tap((remoteData: RemoteData<O>) => {
+            if (hasValue(remoteData) && remoteData.isStale) {
+              requestFn();
+            }
+          })
+        );
+      } else {
+        return source;
+      }
+    };
+  }
+
+  /**
+   * Returns an observable of {@link RemoteData} of an object, based on an href, with a list of
+   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   * @param href$                       The url of object we want to retrieve. Can be a string or
+   *                                    an Observable<string>
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   */
+  findByHref(href$: string | Observable<string>, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<T>> {
+    if (typeof href$ === 'string') {
+      href$ = observableOf(href$);
+    }
+
+    const requestHref$ = href$.pipe(
+      isNotEmptyOperator(),
+      take(1),
+      map((href: string) => this.buildHrefFromFindOptions(href, {}, [], ...linksToFollow)),
+    );
+
+    this.createAndSendGetRequest(requestHref$, useCachedVersionIfAvailable);
+
+    return this.rdbService.buildSingle<T>(requestHref$, ...linksToFollow).pipe(
+      // This skip ensures that if a stale object is present in the cache when you do a
+      // call it isn't immediately returned, but we wait until the remote data for the new request
+      // is created. If useCachedVersionIfAvailable is false it also ensures you don't get a
+      // cached completed object
+      skipWhile((rd: RemoteData<T>) => useCachedVersionIfAvailable ? rd.isStale : rd.hasCompleted),
+      this.reRequestStaleRemoteData(reRequestOnStale, () =>
+        this.findByHref(href$, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow)),
+    );
+  }
+
+  /**
+   * Returns an Observable of a {@link RemoteData} of a {@link PaginatedList} of objects, based on an href,
+   * with a list of {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * @param href$                       The url of list we want to retrieve. Can be a string or an Observable<string>
+   * @param options
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's no valid cached version.
+   * @param reRequestOnStale            Whether or not the request should automatically be re-requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  findListByHref(href$: string | Observable<string>, options: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>> {
+    if (typeof href$ === 'string') {
+      href$ = observableOf(href$);
+    }
+
+    const requestHref$ = href$.pipe(
+      isNotEmptyOperator(),
+      take(1),
+      map((href: string) => this.buildHrefFromFindOptions(href, options, [], ...linksToFollow)),
+    );
+
+    this.createAndSendGetRequest(requestHref$, useCachedVersionIfAvailable);
+
+    return this.rdbService.buildList<T>(requestHref$, ...linksToFollow).pipe(
+      // This skip ensures that if a stale object is present in the cache when you do a
+      // call it isn't immediately returned, but we wait until the remote data for the new request
+      // is created. If useCachedVersionIfAvailable is false it also ensures you don't get a
+      // cached completed object
+      skipWhile((rd: RemoteData<PaginatedList<T>>) => useCachedVersionIfAvailable ? rd.isStale : rd.hasCompleted),
+      this.reRequestStaleRemoteData(reRequestOnStale, () =>
+        this.findListByHref(href$, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow)),
+    );
+  }
+
+  /**
+   * Create a GET request for the given href, and send it.
+   *
+   * @param href$                       The url of object we want to retrieve. Can be a string or
+   *                                    an Observable<string>
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   */
+  protected createAndSendGetRequest(href$: string | Observable<string>, useCachedVersionIfAvailable = true): void {
+    if (isNotEmpty(href$)) {
+      if (typeof href$ === 'string') {
+        href$ = observableOf(href$);
+      }
+
+      href$.pipe(
+        isNotEmptyOperator(),
+        take(1)
+      ).subscribe((href: string) => {
+        const requestId = this.requestService.generateRequestId();
+        const request = new GetRequest(requestId, href);
+        if (hasValue(this.responseMsToLive)) {
+          request.responseMsToLive = this.responseMsToLive;
+        }
+        this.requestService.send(request, useCachedVersionIfAvailable);
+      });
+    }
+  }
+
+  /**
+   * Return the links to traverse from the root of the api to the
+   * endpoint this DataService represents
+   *
+   * e.g. if the api root links to 'foo', and the endpoint at 'foo'
+   * links to 'bar' the linkPath for the BarDataService would be
+   * 'foo/bar'
+   */
+  getLinkPath(): string {
+    return this.linkPath;
+  }
+
+  /**
+   * Invalidate a cached object by its href
+   * @param href  the href to invalidate
+   */
+  public invalidateByHref(href: string): Observable<boolean> {
+    const done$ = new AsyncSubject<boolean>();
+
+    this.objectCache.getByHref(href).pipe(
+      take(1),
+      switchMap((oce: ObjectCacheEntry) => observableFrom(oce.requestUUIDs).pipe(
+        mergeMap((requestUUID: string) => this.requestService.setStaleByUUID(requestUUID)),
+        toArray(),
+      )),
+    ).subscribe(() => {
+      done$.next(true);
+      done$.complete();
+    });
+
+    return done$;
+  }
+}

src/app/core/data/base/create-data.spec.ts

@@ -0,0 +1,225 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { FindListOptions } from '../find-list-options.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { CreateData, CreateDataImpl } from './create-data';
+import { NotificationsService } from '../../../shared/notifications/notifications.service';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { createFailedRemoteDataObject, createSuccessfulRemoteDataObject } from '../../../shared/remote-data.utils';
+import { RequestParam } from '../../cache/models/request-param.model';
+import { RestRequestMethod } from '../rest-request-method';
+import { DSpaceObject } from '../../shared/dspace-object.model';
+
+/**
+ * Tests whether calls to `CreateData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testCreateDataImplementation(serviceFactory: () => CreateData<any>) {
+  let service;
+
+  describe('CreateData implementation', () => {
+    const OBJ = Object.assign(new DSpaceObject(), {
+      uuid: '08eec68f-45e4-47a3-80c5-f0beb5627079',
+    });
+    const PARAMS = [
+      new RequestParam('abc', 123), new RequestParam('def', 456),
+    ];
+
+    beforeAll(() => {
+      service = serviceFactory();
+
+      (service as any).createData = jasmine.createSpyObj('createData', {
+        create: 'TEST create',
+      });
+    });
+
+    it('should handle calls to create', () => {
+      const out: any = service.create(OBJ, ...PARAMS);
+
+      expect((service as any).createData.create).toHaveBeenCalledWith(OBJ, ...PARAMS);
+      expect(out).toBe('TEST create');
+    });
+  });
+}
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends CreateDataImpl<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+  ) {
+    super('test', requestService, rdbService, objectCache, halService, notificationsService, undefined);
+  }
+
+  public getEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+describe('CreateDataImpl', () => {
+  let service: TestService;
+  let requestService;
+  let halService;
+  let rdbService;
+  let objectCache;
+  let notificationsService;
+  let remoteDataMocks;
+  let obj;
+
+  let MOCK_SUCCEEDED_RD;
+  let MOCK_FAILED_RD;
+
+  let buildFromRequestUUIDSpy: jasmine.Spy;
+  let createOnEndpointSpy: jasmine.Spy;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      },
+    } as any;
+    notificationsService = jasmine.createSpyObj('notificationsService', {
+      error: undefined,
+    });
+
+    obj = {
+      uuid: '1698f1d3-be98-4c51-9fd8-6bfedcbd59b7',
+    };
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+      notificationsService,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+
+    buildFromRequestUUIDSpy = spyOn(rdbService, 'buildFromRequestUUID').and.callThrough();
+    createOnEndpointSpy = spyOn(service, 'createOnEndpoint').and.callThrough();
+
+    MOCK_SUCCEEDED_RD = createSuccessfulRemoteDataObject({});
+    MOCK_FAILED_RD = createFailedRemoteDataObject('something went wrong');
+  });
+
+  describe('create', () => {
+    it('should POST the object to the root endpoint with the given parameters and return the remote data', (done) => {
+      const params = [
+        new RequestParam('abc', 123), new RequestParam('def', 456)
+      ];
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(remoteDataMocks.Success));
+
+      service.create(obj, ...params).subscribe(out => {
+        expect(createOnEndpointSpy).toHaveBeenCalledWith(obj, jasmine.anything());
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.POST,
+          uuid: requestService.generateRequestId(),
+          href: 'https://rest.api/core?abc=123&def=456',
+          body: JSON.stringify(obj),
+        }));
+        expect(buildFromRequestUUIDSpy).toHaveBeenCalledWith(requestService.generateRequestId());
+        expect(out).toEqual(remoteDataMocks.Success);
+        done();
+      });
+    });
+  });
+
+  describe('createOnEndpoint', () => {
+    beforeEach(() => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(remoteDataMocks.Success));
+    });
+
+    it('should send a POST request with the object as JSON', (done) => {
+      service.createOnEndpoint(obj, observableOf('https://rest.api/core/custom?search')).subscribe(out => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.POST,
+          body: JSON.stringify(obj),
+        }));
+        done();
+      });
+    });
+
+    it('should send the POST request to the given endpoint', (done) => {
+
+      service.createOnEndpoint(obj, observableOf('https://rest.api/core/custom?search')).subscribe(out => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.POST,
+          href: 'https://rest.api/core/custom?search',
+        }));
+        done();
+      });
+    });
+
+    it('should return the remote data for the sent request', (done) => {
+      service.createOnEndpoint(obj, observableOf('https://rest.api/core/custom?search')).subscribe(out => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.POST,
+          uuid: requestService.generateRequestId(),
+        }));
+        expect(buildFromRequestUUIDSpy).toHaveBeenCalledWith(requestService.generateRequestId());
+        expect(notificationsService.error).not.toHaveBeenCalled();
+        expect(out).toEqual(remoteDataMocks.Success);
+        done();
+      });
+    });
+
+    it('should show an error notification if the request fails', (done) => {
+      buildFromRequestUUIDSpy.and.returnValue(observableOf(remoteDataMocks.Error));
+
+      service.createOnEndpoint(obj, observableOf('https://rest.api/core/custom?search')).subscribe(out => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.POST,
+          uuid: requestService.generateRequestId(),
+        }));
+        expect(buildFromRequestUUIDSpy).toHaveBeenCalledWith(requestService.generateRequestId());
+        expect(notificationsService.error).toHaveBeenCalled();
+        expect(out).toEqual(remoteDataMocks.Error);
+        done();
+      });
+    });
+  });
+});

src/app/core/data/base/create-data.ts

@@ -0,0 +1,107 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { BaseDataService } from './base-data.service';
+import { RequestParam } from '../../cache/models/request-param.model';
+import { Observable } from 'rxjs';
+import { RemoteData } from '../remote-data';
+import { hasValue, isNotEmptyOperator } from '../../../shared/empty.util';
+import { distinctUntilChanged, map, take, takeWhile } from 'rxjs/operators';
+import { DSpaceSerializer } from '../../dspace-rest/dspace.serializer';
+import { getClassForType } from '../../cache/builders/build-decorators';
+import { CreateRequest } from '../request.models';
+import { NotificationOptions } from '../../../shared/notifications/models/notification-options.model';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { NotificationsService } from '../../../shared/notifications/notifications.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+
+/**
+ * Interface for a data service that can create objects.
+ */
+export interface CreateData<T extends CacheableObject> {
+  /**
+   * Create a new DSpaceObject on the server, and store the response
+   * in the object cache
+   *
+   * @param object  The object to create
+   * @param params  Array with additional params to combine with query string
+   */
+  create(object: T, ...params: RequestParam[]): Observable<RemoteData<T>>;
+}
+
+/**
+ * A DataService feature to create objects.
+ *
+ * Concrete data services can use this feature by implementing {@link CreateData}
+ * and delegating its method to an inner instance of this class.
+ */
+export class CreateDataImpl<T extends CacheableObject> extends BaseDataService<T> implements CreateData<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+    protected responseMsToLive: number,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive);
+  }
+
+  /**
+   * Create a new object on the server, and store the response in the object cache
+   *
+   * @param object    The object to create
+   * @param params    Array with additional params to combine with query string
+   */
+  create(object: T, ...params: RequestParam[]): Observable<RemoteData<T>> {
+    const endpoint$ = this.getEndpoint().pipe(
+      isNotEmptyOperator(),
+      distinctUntilChanged(),
+      map((endpoint: string) => this.buildHrefWithParams(endpoint, params)),
+    );
+    return this.createOnEndpoint(object, endpoint$);
+  }
+
+  /**
+   * Send a POST request to create a new resource to a specific endpoint.
+   * Use this method if the endpoint needs to be adjusted. In most cases {@link create} should be sufficient.
+   * @param object     the object to create
+   * @param endpoint$  the endpoint to send the POST request to
+   */
+  createOnEndpoint(object: T, endpoint$: Observable<string>): Observable<RemoteData<T>> {
+    const requestId = this.requestService.generateRequestId();
+    const serializedObject = new DSpaceSerializer(getClassForType(object.type)).serialize(object);
+
+    endpoint$.pipe(
+      take(1),
+    ).subscribe((endpoint: string) => {
+      const request = new CreateRequest(requestId, endpoint, JSON.stringify(serializedObject));
+      if (hasValue(this.responseMsToLive)) {
+        request.responseMsToLive = this.responseMsToLive;
+      }
+      this.requestService.send(request);
+    });
+
+    const result$ = this.rdbService.buildFromRequestUUID<T>(requestId);
+
+    // TODO a dataservice is not the best place to show a notification,
+    // this should move up to the components that use this method
+    result$.pipe(
+      takeWhile((rd: RemoteData<T>) => rd.isLoading, true)
+    ).subscribe((rd: RemoteData<T>) => {
+      if (rd.hasFailed) {
+        this.notificationsService.error('Server Error:', rd.errorMessage, new NotificationOptions(-1));
+      }
+    });
+
+    return result$;
+  }
+}

src/app/core/data/base/data-service.decorator.spec.ts

@@ -0,0 +1,55 @@
+/* eslint-disable max-classes-per-file */
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { ResourceType } from '../../shared/resource-type';
+import { BaseDataService } from './base-data.service';
+import { HALDataService } from './hal-data-service.interface';
+import { dataService, getDataServiceFor } from './data-service.decorator';
+
+class TestService extends BaseDataService<any> {
+}
+
+class AnotherTestService implements HALDataService<any> {
+  public findListByHref(href$, findListOptions, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow): any {
+    return undefined;
+  }
+
+  public findByHref(href$, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow): any {
+    return undefined;
+  }
+}
+
+let testType;
+
+describe('@dataService/getDataServiceFor', () => {
+  beforeEach(() => {
+    testType = new ResourceType('testType-' + new Date().getTime());
+  });
+
+  it('should register a resourcetype for a dataservice', () => {
+    dataService(testType)(TestService);
+    expect(getDataServiceFor(testType)).toBe(TestService);
+  });
+
+  describe(`when the resource type isn't specified`, () => {
+    it(`should throw an error`, () => {
+      expect(() => {
+        dataService(undefined)(TestService);
+      }).toThrow();
+    });
+  });
+
+  describe(`when there already is a registered dataservice for a resourcetype`, () => {
+    it(`should throw an error`, () => {
+      dataService(testType)(TestService);
+      expect(() => {
+        dataService(testType)(AnotherTestService);
+      }).toThrow();
+    });
+  });
+});

src/app/core/data/base/data-service.decorator.ts

@@ -0,0 +1,51 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { InjectionToken } from '@angular/core';
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { ResourceType } from '../../shared/resource-type';
+import { GenericConstructor } from '../../shared/generic-constructor';
+import { hasNoValue, hasValue } from '../../../shared/empty.util';
+import { HALDataService } from './hal-data-service.interface';
+
+export const DATA_SERVICE_FACTORY = new InjectionToken<(resourceType: ResourceType) => GenericConstructor<HALDataService<any>>>('getDataServiceFor', {
+  providedIn: 'root',
+  factory: () => getDataServiceFor,
+});
+const dataServiceMap = new Map();
+
+/**
+ * A class decorator to indicate that this class is a data service for a given HAL resource type.
+ *
+ * In most cases, a data service should extend {@link BaseDataService}.
+ * At the very least it must implement {@link HALDataService} in order for it to work with {@link LinkService}.
+ *
+ * @param resourceType the resource type the class is a dataservice for
+ */
+export function dataService(resourceType: ResourceType) {
+  return (target: GenericConstructor<HALDataService<any>>): void => {
+    if (hasNoValue(resourceType)) {
+      throw new Error(`Invalid @dataService annotation on ${target}, resourceType needs to be defined`);
+    }
+    const existingDataservice = dataServiceMap.get(resourceType.value);
+
+    if (hasValue(existingDataservice)) {
+      throw new Error(`Multiple dataservices for ${resourceType.value}: ${existingDataservice} and ${target}`);
+    }
+
+    dataServiceMap.set(resourceType.value, target);
+  };
+}
+
+/**
+ * Return the dataservice matching the given resource type
+ *
+ * @param resourceType the resource type you want the matching dataservice for
+ */
+export function getDataServiceFor<T extends CacheableObject>(resourceType: ResourceType): GenericConstructor<HALDataService<any>> {
+  return dataServiceMap.get(resourceType.value);
+}

src/app/core/data/base/delete-data.spec.ts

@@ -0,0 +1,230 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { constructIdEndpointDefault } from './identifiable-data.service';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { FindListOptions } from '../find-list-options.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
+import { TestScheduler } from 'rxjs/testing';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { DeleteData, DeleteDataImpl } from './delete-data';
+import { NotificationsService } from '../../../shared/notifications/notifications.service';
+import { createFailedRemoteDataObject, createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
+import { RestRequestMethod } from '../rest-request-method';
+
+/**
+ * Tests whether calls to `DeleteData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testDeleteDataImplementation(serviceFactory: () => DeleteData<any>) {
+  let service;
+
+  describe('DeleteData implementation', () => {
+    const ID = '2ce78f3a-791b-4d70-b5eb-753d587bbadd';
+    const HREF = 'https://rest.api/core/items/' + ID;
+    const COPY_VIRTUAL_METADATA = [
+      'a', 'b', 'c'
+    ];
+
+    beforeAll(() => {
+      service = serviceFactory();
+      (service as any).deleteData = jasmine.createSpyObj('deleteData', {
+        delete: 'TEST delete',
+        deleteByHref: 'TEST deleteByHref',
+      });
+    });
+
+    it('should handle calls to delete', () => {
+      const out: any = service.delete(ID, COPY_VIRTUAL_METADATA);
+
+      expect((service as any).deleteData.delete).toHaveBeenCalledWith(ID, COPY_VIRTUAL_METADATA);
+      expect(out).toBe('TEST delete');
+    });
+
+    it('should handle calls to deleteByHref', () => {
+      const out: any = service.deleteByHref(HREF, COPY_VIRTUAL_METADATA);
+
+      expect((service as any).deleteData.deleteByHref).toHaveBeenCalledWith(HREF, COPY_VIRTUAL_METADATA);
+      expect(out).toBe('TEST deleteByHref');
+    });
+  });
+}
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends DeleteDataImpl<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+  ) {
+    super(undefined, requestService, rdbService, objectCache, halService, notificationsService, undefined, constructIdEndpointDefault);
+  }
+
+  public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+describe('DeleteDataImpl', () => {
+  let service: TestService;
+  let requestService;
+  let halService;
+  let rdbService;
+  let objectCache;
+  let notificationsService;
+  let selfLink;
+  let linksToFollow;
+  let testScheduler;
+  let remoteDataMocks;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      }
+    } as any;
+    notificationsService = {} as NotificationsService;
+    selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
+    linksToFollow = [
+      followLink('a'),
+      followLink('b')
+    ];
+
+    testScheduler = new TestScheduler((actual, expected) => {
+      // asserting the two objects are equal
+      // e.g. using chai.
+      expect(actual).toEqual(expected);
+    });
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+      notificationsService,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+  });
+
+  describe('delete', () => {
+    let MOCK_SUCCEEDED_RD;
+    let MOCK_FAILED_RD;
+
+    let invalidateByHrefSpy: jasmine.Spy;
+    let buildFromRequestUUIDAndAwaitSpy: jasmine.Spy;
+    let getIDHrefObsSpy: jasmine.Spy;
+    let deleteByHrefSpy: jasmine.Spy;
+
+    beforeEach(() => {
+      invalidateByHrefSpy = spyOn(service, 'invalidateByHref').and.returnValue(observableOf(true));
+      buildFromRequestUUIDAndAwaitSpy = spyOn(rdbService, 'buildFromRequestUUIDAndAwait').and.callThrough();
+      getIDHrefObsSpy = spyOn(service, 'getIDHrefObs').and.callThrough();
+      deleteByHrefSpy = spyOn(service, 'deleteByHref').and.callThrough();
+
+      MOCK_SUCCEEDED_RD = createSuccessfulRemoteDataObject({});
+      MOCK_FAILED_RD = createFailedRemoteDataObject('something went wrong');
+    });
+
+    it('should retrieve href by ID and call deleteByHref', () => {
+      getIDHrefObsSpy.and.returnValue(observableOf('some-href'));
+      buildFromRequestUUIDAndAwaitSpy.and.returnValue(createSuccessfulRemoteDataObject$({}));
+
+      service.delete('some-id', ['a', 'b', 'c']).subscribe(rd => {
+        expect(getIDHrefObsSpy).toHaveBeenCalledWith('some-id');
+        expect(deleteByHrefSpy).toHaveBeenCalledWith('some-href', ['a', 'b', 'c']);
+      });
+    });
+
+    describe('deleteByHref', () => {
+      it('should send a DELETE request', (done) => {
+        buildFromRequestUUIDAndAwaitSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+
+        service.deleteByHref('some-href').subscribe(() => {
+          expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+            method: RestRequestMethod.DELETE,
+            href: 'some-href',
+          }));
+          done();
+        });
+      });
+
+      it('should include the virtual metadata to be copied in the DELETE request', (done) => {
+        buildFromRequestUUIDAndAwaitSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+
+        service.deleteByHref('some-href', ['a', 'b', 'c']).subscribe(() => {
+          expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+            method: RestRequestMethod.DELETE,
+            href: 'some-href?copyVirtualMetadata=a&copyVirtualMetadata=b&copyVirtualMetadata=c',
+          }));
+          done();
+        });
+      });
+
+      it('should invalidate the currently cached object', (done) => {
+        service.deleteByHref('some-href').subscribe(() => {
+          expect(buildFromRequestUUIDAndAwaitSpy).toHaveBeenCalledWith(
+            requestService.generateRequestId(),
+            jasmine.anything(),
+          );
+
+          const callback = (rdbService.buildFromRequestUUIDAndAwait as jasmine.Spy).calls.argsFor(0)[1];
+          callback();
+          expect(service.invalidateByHref).toHaveBeenCalledWith('some-href');
+
+          done();
+        });
+      });
+
+      it('should return the RemoteData of the response', (done) => {
+        buildFromRequestUUIDAndAwaitSpy.and.returnValue(observableOf(MOCK_SUCCEEDED_RD));
+
+        service.deleteByHref('some-href').subscribe(rd => {
+          expect(rd).toBe(MOCK_SUCCEEDED_RD);
+          done();
+        });
+      });
+    });
+  });
+});

src/app/core/data/base/delete-data.ts

@@ -0,0 +1,87 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { Observable } from 'rxjs';
+import { RemoteData } from '../remote-data';
+import { NoContent } from '../../shared/NoContent.model';
+import { switchMap } from 'rxjs/operators';
+import { DeleteRequest } from '../request.models';
+import { hasNoValue, hasValue } from '../../../shared/empty.util';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { NotificationsService } from '../../../shared/notifications/notifications.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { ConstructIdEndpoint, IdentifiableDataService } from './identifiable-data.service';
+
+export interface DeleteData<T extends CacheableObject> {
+  /**
+   * Delete an existing object on the server
+   * @param   objectId The id of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   */
+  delete(objectId: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>>;
+
+  /**
+   * Delete an existing object on the server
+   * @param   href The self link of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   *          Only emits once all request related to the DSO has been invalidated.
+   */
+  deleteByHref(href: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>>;
+}
+
+export class DeleteDataImpl<T extends CacheableObject> extends IdentifiableDataService<T> implements DeleteData<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+    protected responseMsToLive: number,
+    protected constructIdEndpoint: ConstructIdEndpoint,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive, constructIdEndpoint);
+    if (hasNoValue(constructIdEndpoint)) {
+      throw new Error(`DeleteDataImpl initialized without a constructIdEndpoint method (linkPath: ${linkPath})`);
+    }
+  }
+
+  delete(objectId: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.getIDHrefObs(objectId).pipe(
+      switchMap((href: string) => this.deleteByHref(href, copyVirtualMetadata)),
+    );
+  }
+
+  deleteByHref(href: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    const requestId = this.requestService.generateRequestId();
+
+    if (copyVirtualMetadata) {
+      copyVirtualMetadata.forEach((id) =>
+        href += (href.includes('?') ? '&' : '?')
+          + 'copyVirtualMetadata='
+          + id,
+      );
+    }
+
+    const request = new DeleteRequest(requestId, href);
+    if (hasValue(this.responseMsToLive)) {
+      request.responseMsToLive = this.responseMsToLive;
+    }
+    this.requestService.send(request);
+
+    return this.rdbService.buildFromRequestUUIDAndAwait(requestId, () => this.invalidateByHref(href));
+  }
+}

src/app/core/data/base/find-all-data.spec.ts

@@ -0,0 +1,296 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { FindAllData, FindAllDataImpl } from './find-all-data';
+import { FindListOptions } from '../find-list-options.model';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { TestScheduler } from 'rxjs/testing';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { SortDirection, SortOptions } from '../../cache/models/sort-options.model';
+import { RequestParam } from '../../cache/models/request-param.model';
+
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { Observable, of as observableOf } from 'rxjs';
+
+/**
+ * Tests whether calls to `FindAllData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testFindAllDataImplementation(serviceFactory: () => FindAllData<any>) {
+  let service;
+
+  describe('FindAllData implementation', () => {
+    const OPTIONS = Object.assign(new FindListOptions(), { elementsPerPage: 10, currentPage: 3 });
+    const FOLLOWLINKS = [
+      followLink('test'),
+      followLink('something'),
+    ];
+
+    beforeAll(() => {
+      service = serviceFactory();
+      (service as any).findAllData =  jasmine.createSpyObj('findAllData', {
+        findAll: 'TEST findAll',
+      });
+    });
+
+    it('should handle calls to findAll', () => {
+      const out: any = service.findAll(OPTIONS, false, true, ...FOLLOWLINKS);
+
+      expect((service as any).findAllData.findAll).toHaveBeenCalledWith(OPTIONS, false, true, ...FOLLOWLINKS);
+      expect(out).toBe('TEST findAll');
+    });
+  });
+}
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends FindAllDataImpl<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+  ) {
+    super(undefined, requestService, rdbService, objectCache, halService, undefined);
+  }
+
+  public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+describe('FindAllDataImpl', () => {
+  let service: TestService;
+  let options: FindListOptions;
+  let requestService;
+  let halService;
+  let rdbService;
+  let objectCache;
+  let selfLink;
+  let linksToFollow;
+  let testScheduler;
+  let remoteDataMocks;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      },
+    } as any;
+    selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
+    linksToFollow = [
+      followLink('a'),
+      followLink('b'),
+    ];
+
+    testScheduler = new TestScheduler((actual, expected) => {
+      // asserting the two objects are equal
+      // e.g. using chai.
+      expect(actual).toEqual(expected);
+    });
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+  });
+
+  describe('getFindAllHref', () => {
+
+    it('should return an observable with the endpoint', () => {
+      options = {};
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+          expect(value).toBe(endpoint);
+        },
+      );
+    });
+
+    it('should include page in href if currentPage provided in options', () => {
+      options = { currentPage: 2 };
+      const expected = `${endpoint}?page=${options.currentPage - 1}`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include size in href if elementsPerPage provided in options', () => {
+      options = { elementsPerPage: 5 };
+      const expected = `${endpoint}?size=${options.elementsPerPage}`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include sort href if SortOptions provided in options', () => {
+      const sortOptions = new SortOptions('field1', SortDirection.ASC);
+      options = { sort: sortOptions };
+      const expected = `${endpoint}?sort=${sortOptions.field},${sortOptions.direction}`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include startsWith in href if startsWith provided in options', () => {
+      options = { startsWith: 'ab' };
+      const expected = `${endpoint}?startsWith=${options.startsWith}`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include all provided options in href', () => {
+      const sortOptions = new SortOptions('field1', SortDirection.DESC);
+      options = {
+        currentPage: 6,
+        elementsPerPage: 10,
+        sort: sortOptions,
+        startsWith: 'ab',
+
+      };
+      const expected = `${endpoint}?page=${options.currentPage - 1}&size=${options.elementsPerPage}` +
+        `&sort=${sortOptions.field},${sortOptions.direction}&startsWith=${options.startsWith}`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include all searchParams in href if any provided in options', () => {
+      options = {
+        searchParams: [
+          new RequestParam('param1', 'test'),
+          new RequestParam('param2', 'test2'),
+        ],
+      };
+      const expected = `${endpoint}?param1=test&param2=test2`;
+
+      (service as any).getFindAllHref(options).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include linkPath in href if any provided', () => {
+      const expected = `${endpoint}/test/entries`;
+
+      (service as any).getFindAllHref({}, 'test/entries').subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include single linksToFollow as embed', () => {
+      const expected = `${endpoint}?embed=bundles`;
+
+      (service as any).getFindAllHref({}, null, followLink('bundles')).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include single linksToFollow as embed and its size', () => {
+      const expected = `${endpoint}?embed.size=bundles=5&embed=bundles`;
+      const config: FindListOptions = Object.assign(new FindListOptions(), {
+        elementsPerPage: 5,
+      });
+      (service as any).getFindAllHref({}, null, followLink('bundles', { findListOptions: config })).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include multiple linksToFollow as embed', () => {
+      const expected = `${endpoint}?embed=bundles&embed=owningCollection&embed=templateItemOf`;
+
+      (service as any).getFindAllHref({}, null, followLink('bundles'), followLink('owningCollection'), followLink('templateItemOf')).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include multiple linksToFollow as embed and its sizes if given', () => {
+      const expected = `${endpoint}?embed=bundles&embed.size=owningCollection=2&embed=owningCollection&embed=templateItemOf`;
+
+      const config: FindListOptions = Object.assign(new FindListOptions(), {
+        elementsPerPage: 2,
+      });
+
+      (service as any).getFindAllHref({}, null, followLink('bundles'), followLink('owningCollection', { findListOptions: config }), followLink('templateItemOf')).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should not include linksToFollow with shouldEmbed = false', () => {
+      const expected = `${endpoint}?embed=templateItemOf`;
+
+      (service as any).getFindAllHref(
+        {},
+        null,
+        followLink('bundles', { shouldEmbed: false }),
+        followLink('owningCollection', { shouldEmbed: false }),
+        followLink('templateItemOf'),
+      ).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include nested linksToFollow 3lvl', () => {
+      const expected = `${endpoint}?embed=owningCollection/itemtemplate/relationships`;
+
+      (service as any).getFindAllHref({}, null, followLink('owningCollection', {}, followLink('itemtemplate', {}, followLink('relationships')))).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+
+    it('should include nested linksToFollow 2lvl and nested embed\'s size', () => {
+      const expected = `${endpoint}?embed.size=owningCollection/itemtemplate=4&embed=owningCollection/itemtemplate`;
+      const config: FindListOptions = Object.assign(new FindListOptions(), {
+        elementsPerPage: 4,
+      });
+      (service as any).getFindAllHref({}, null, followLink('owningCollection', {}, followLink('itemtemplate', { findListOptions: config }))).subscribe((value) => {
+        expect(value).toBe(expected);
+      });
+    });
+  });
+});

src/app/core/data/base/find-all-data.ts

@@ -0,0 +1,101 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+
+import { Observable } from 'rxjs';
+import { FindListOptions } from '../find-list-options.model';
+import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
+import { RemoteData } from '../remote-data';
+import { PaginatedList } from '../paginated-list.model';
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { BaseDataService } from './base-data.service';
+import { distinctUntilChanged, filter, map } from 'rxjs/operators';
+import { isNotEmpty } from '../../../shared/empty.util';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+
+/**
+ * Interface for a data service that list all of its objects.
+ */
+export interface FindAllData<T extends CacheableObject> {
+  /**
+   * Returns {@link RemoteData} of all object with a list of {@link FollowLinkConfig}, to indicate which embedded
+   * info should be added to the objects
+   *
+   * @param options                     Find list options object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>>}
+   *    Return an observable that emits object list
+   */
+  findAll(options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>>;
+}
+
+/**
+ * A DataService feature to list all objects.
+ *
+ * Concrete data services can use this feature by implementing {@link FindAllData}
+ * and delegating its method to an inner instance of this class.
+ */
+export class FindAllDataImpl<T extends CacheableObject> extends BaseDataService<T> implements FindAllData<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected responseMsToLive: number,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive);
+  }
+
+  /**
+   * Returns {@link RemoteData} of all object with a list of {@link FollowLinkConfig}, to indicate which embedded
+   * info should be added to the objects
+   *
+   * @param options                     Find list options object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>>}
+   *    Return an observable that emits object list
+   */
+  findAll(options: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>> {
+    return this.findListByHref(this.getFindAllHref(options), options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Create the HREF with given options object
+   *
+   * @param options The [[FindListOptions]] object
+   * @param linkPath The link path for the object
+   * @return {Observable<string>}
+   *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  getFindAllHref(options: FindListOptions = {}, linkPath?: string, ...linksToFollow: FollowLinkConfig<T>[]): Observable<string> {
+    let endpoint$: Observable<string>;
+    const args = [];
+
+    endpoint$ = this.getBrowseEndpoint(options).pipe(
+      filter((href: string) => isNotEmpty(href)),
+      map((href: string) => isNotEmpty(linkPath) ? `${href}/${linkPath}` : href),
+      distinctUntilChanged(),
+    );
+
+    return endpoint$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args, ...linksToFollow)));
+  }
+}

src/app/core/data/base/hal-data-service.interface.ts

@@ -0,0 +1,41 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { Observable } from 'rxjs';
+import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
+import { RemoteData } from '../remote-data';
+import { FindListOptions } from '../find-list-options.model';
+import { PaginatedList } from '../paginated-list.model';
+import { HALResource } from '../../shared/hal-resource.model';
+
+/**
+ * An interface defining the minimum functionality needed for a data service to resolve HAL resources.
+ */
+export interface HALDataService<T extends HALResource> {
+  /**
+   * Returns an Observable of {@link RemoteData} of an object, based on an href,
+   * with a list of {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * @param href$                       The url of object we want to retrieve. Can be a string or an Observable<string>
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's no valid cached version.
+   * @param reRequestOnStale            Whether or not the request should automatically be re-requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  findByHref(href$: string | Observable<string>, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<T>>;
+
+  /**
+   * Returns an Observable of a {@link RemoteData} of a {@link PaginatedList} of objects, based on an href,
+   * with a list of {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   *
+   * @param href$                       The url of list we want to retrieve. Can be a string or an Observable<string>
+   * @param findListOptions             The options for to use for this find list request.
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's no valid cached version.
+   * @param reRequestOnStale            Whether or not the request should automatically be re-requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  findListByHref(href$: string | Observable<string>, findListOptions?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>>;
+}

src/app/core/data/base/identifiable-data.service.spec.ts

@@ -0,0 +1,145 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { FindListOptions } from '../find-list-options.model';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
+import { TestScheduler } from 'rxjs/testing';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { IdentifiableDataService } from './identifiable-data.service';
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends IdentifiableDataService<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+  ) {
+    super(undefined, requestService, rdbService, objectCache, halService);
+  }
+
+  public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+describe('IdentifiableDataService', () => {
+  let service: TestService;
+  let requestService;
+  let halService;
+  let rdbService;
+  let objectCache;
+  let selfLink;
+  let linksToFollow;
+  let testScheduler;
+  let remoteDataMocks;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      }
+    } as any;
+    selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
+    linksToFollow = [
+      followLink('a'),
+      followLink('b')
+    ];
+
+    testScheduler = new TestScheduler((actual, expected) => {
+      // asserting the two objects are equal
+      // e.g. using chai.
+      expect(actual).toEqual(expected);
+    });
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+  });
+
+  describe('getIDHref', () => {
+    const endpointMock = 'https://dspace7-internal.atmire.com/server/api/core/items';
+    const resourceIdMock = '003c99b4-d4fe-44b0-a945-e12182a7ca89';
+
+    it('should return endpoint', () => {
+      const result = (service as any).getIDHref(endpointMock, resourceIdMock);
+      expect(result).toEqual(endpointMock + '/' + resourceIdMock);
+    });
+
+    it('should include single linksToFollow as embed', () => {
+      const expected = `${endpointMock}/${resourceIdMock}?embed=bundles`;
+      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('bundles'));
+      expect(result).toEqual(expected);
+    });
+
+    it('should include multiple linksToFollow as embed', () => {
+      const expected = `${endpointMock}/${resourceIdMock}?embed=bundles&embed=owningCollection&embed=templateItemOf`;
+      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('bundles'), followLink('owningCollection'), followLink('templateItemOf'));
+      expect(result).toEqual(expected);
+    });
+
+    it('should not include linksToFollow with shouldEmbed = false', () => {
+      const expected = `${endpointMock}/${resourceIdMock}?embed=templateItemOf`;
+      const result = (service as any).getIDHref(
+        endpointMock,
+        resourceIdMock,
+        followLink('bundles', { shouldEmbed: false }),
+        followLink('owningCollection', { shouldEmbed: false }),
+        followLink('templateItemOf')
+      );
+      expect(result).toEqual(expected);
+    });
+
+    it('should include nested linksToFollow 3lvl', () => {
+      const expected = `${endpointMock}/${resourceIdMock}?embed=owningCollection/itemtemplate/relationships`;
+      const result = (service as any).getIDHref(endpointMock, resourceIdMock, followLink('owningCollection', {}, followLink('itemtemplate', {}, followLink('relationships'))));
+      expect(result).toEqual(expected);
+    });
+  });
+});

src/app/core/data/base/identifiable-data.service.ts

@@ -0,0 +1,83 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+import { RemoteData } from '../remote-data';
+import { BaseDataService } from './base-data.service';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+
+/**
+ * Shorthand type for the method to construct an ID endpoint.
+ */
+export type ConstructIdEndpoint = (endpoint: string, resourceID: string) => string;
+
+/**
+ * The default method to construct an ID endpoint
+ */
+export const constructIdEndpointDefault = (endpoint, resourceID) => `${endpoint}/${resourceID}`;
+
+/**
+ * A type of data service that deals with objects that have an ID.
+ *
+ * The effective endpoint to use for the ID can be adjusted by providing a different {@link ConstructIdEndpoint} method.
+ * This method is passed as an argument so that it can be set on data service features without having to override them.
+ */
+export class IdentifiableDataService<T extends CacheableObject> extends BaseDataService<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected responseMsToLive?: number,
+    protected constructIdEndpoint: ConstructIdEndpoint = constructIdEndpointDefault,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive);
+  }
+
+  /**
+   * Returns an observable of {@link RemoteData} of an object, based on its ID, with a list of
+   * {@link FollowLinkConfig}, to automatically resolve {@link HALLink}s of the object
+   * @param id                          ID of object we want to retrieve
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   */
+  findById(id: string, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<T>> {
+    const href$ = this.getIDHrefObs(encodeURIComponent(id), ...linksToFollow);
+    return this.findByHref(href$, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Create the HREF for a specific object based on its identifier; with possible embed query params based on linksToFollow
+   * @param endpoint The base endpoint for the type of object
+   * @param resourceID The identifier for the object
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  getIDHref(endpoint, resourceID, ...linksToFollow: FollowLinkConfig<T>[]): string {
+    return this.buildHrefFromFindOptions(this.constructIdEndpoint(endpoint, resourceID), {}, [], ...linksToFollow);
+  }
+
+  /**
+   * Create an observable for the HREF of a specific object based on its identifier
+   * @param resourceID The identifier for the object
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  getIDHrefObs(resourceID: string, ...linksToFollow: FollowLinkConfig<T>[]): Observable<string> {
+    return this.getEndpoint().pipe(
+      map((endpoint: string) => this.getIDHref(endpoint, resourceID, ...linksToFollow)));
+  }
+}

src/app/core/data/base/patch-data.spec.ts

@@ -0,0 +1,235 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+/* eslint-disable max-classes-per-file */
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { FindListOptions } from '../find-list-options.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
+import { TestScheduler } from 'rxjs/testing';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { PatchData, PatchDataImpl } from './patch-data';
+import { ChangeAnalyzer } from '../change-analyzer';
+import { Item } from '../../shared/item.model';
+import { compare, Operation } from 'fast-json-patch';
+import { PatchRequest } from '../request.models';
+import { DSpaceObject } from '../../shared/dspace-object.model';
+import { createSuccessfulRemoteDataObject$ } from '../../../shared/remote-data.utils';
+import { constructIdEndpointDefault } from './identifiable-data.service';
+import { RestRequestMethod } from '../rest-request-method';
+
+/**
+ * Tests whether calls to `PatchData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testPatchDataImplementation(serviceFactory: () => PatchData<any>) {
+  let service;
+
+  describe('PatchData implementation', () => {
+    const OBJ = Object.assign(new DSpaceObject(), {
+      uuid: '08eec68f-45e4-47a3-80c5-f0beb5627079',
+    });
+    const OPERATIONS = [
+      { op: 'replace', path: '/0/value', value: 'test' },
+      { op: 'add', path: '/2/value', value: 'test2' },
+    ] as Operation[];
+    const METHOD = RestRequestMethod.POST;
+
+    beforeAll(() => {
+      service = serviceFactory();
+      (service as any).patchData = jasmine.createSpyObj('patchData', {
+        patch: 'TEST patch',
+        update: 'TEST update',
+        commitUpdates: undefined,
+        createPatchFromCache: 'TEST createPatchFromCache',
+      });
+    });
+
+    it('should handle calls to patch', () => {
+      const out: any = service.patch(OBJ, OPERATIONS);
+
+      expect((service as any).patchData.patch).toHaveBeenCalledWith(OBJ, OPERATIONS);
+      expect(out).toBe('TEST patch');
+    });
+
+    it('should handle calls to update', () => {
+      const out: any = service.update(OBJ);
+
+      expect((service as any).patchData.update).toHaveBeenCalledWith(OBJ);
+      expect(out).toBe('TEST update');
+    });
+
+    it('should handle calls to commitUpdates', () => {
+      service.commitUpdates(METHOD);
+      expect((service as any).patchData.commitUpdates).toHaveBeenCalledWith(METHOD);
+    });
+
+    it('should handle calls to createPatchFromCache', () => {
+      const out: any = service.createPatchFromCache(OBJ);
+
+      expect((service as any).patchData.createPatchFromCache).toHaveBeenCalledWith(OBJ);
+      expect(out).toBe('TEST createPatchFromCache');
+    });
+  });
+}
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends PatchDataImpl<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected comparator: ChangeAnalyzer<Item>,
+  ) {
+    super(undefined, requestService, rdbService, objectCache, halService, comparator, undefined, constructIdEndpointDefault);
+  }
+
+  public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+class DummyChangeAnalyzer implements ChangeAnalyzer<Item> {
+  diff(object1: Item, object2: Item): Operation[] {
+    return compare((object1 as any).metadata, (object2 as any).metadata);
+  }
+}
+
+describe('PatchDataImpl', () => {
+  let service: TestService;
+  let requestService;
+  let halService;
+  let rdbService;
+  let comparator;
+  let objectCache;
+  let selfLink;
+  let linksToFollow;
+  let testScheduler;
+  let remoteDataMocks;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    comparator = new DummyChangeAnalyzer() as any;
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      },
+    } as any;
+    selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
+    linksToFollow = [
+      followLink('a'),
+      followLink('b'),
+    ];
+
+    testScheduler = new TestScheduler((actual, expected) => {
+      // asserting the two objects are equal
+      // e.g. using chai.
+      expect(actual).toEqual(expected);
+    });
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+      comparator,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+  });
+
+  describe('patch', () => {
+    const dso = {
+      uuid: 'dso-uuid'
+    };
+    const operations = [
+      Object.assign({
+        op: 'move',
+        from: '/1',
+        path: '/5'
+      }) as Operation
+    ];
+
+    beforeEach((done) => {
+      service.patch(dso, operations).subscribe(() => {
+        done();
+      });
+    });
+
+    it('should send a PatchRequest', () => {
+      expect(requestService.send).toHaveBeenCalledWith(jasmine.any(PatchRequest));
+    });
+  });
+
+  describe('update', () => {
+    let operations;
+    let dso;
+    let dso2;
+    const name1 = 'random string';
+    const name2 = 'another random string';
+    beforeEach(() => {
+      operations = [{ op: 'replace', path: '/0/value', value: name2 } as Operation];
+
+      dso = Object.assign(new DSpaceObject(), {
+        _links: { self: { href: selfLink } },
+        metadata: [{ key: 'dc.title', value: name1 }]
+      });
+
+      dso2 = Object.assign(new DSpaceObject(), {
+        _links: { self: { href: selfLink } },
+        metadata: [{ key: 'dc.title', value: name2 }]
+      });
+
+      spyOn(service, 'findByHref').and.returnValue(createSuccessfulRemoteDataObject$(dso));
+      spyOn(objectCache, 'addPatch');
+    });
+
+    it('should call addPatch on the object cache with the right parameters when there are differences', () => {
+      service.update(dso2).subscribe();
+      expect(objectCache.addPatch).toHaveBeenCalledWith(selfLink, operations);
+    });
+
+    it('should not call addPatch on the object cache with the right parameters when there are no differences', () => {
+      service.update(dso).subscribe();
+      expect(objectCache.addPatch).not.toHaveBeenCalled();
+    });
+  });
+});

src/app/core/data/base/patch-data.ts

@@ -0,0 +1,143 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { Operation } from 'fast-json-patch';
+import { Observable } from 'rxjs';
+import { RemoteData } from '../remote-data';
+import { find, map, mergeMap } from 'rxjs/operators';
+import { hasNoValue, hasValue, isNotEmpty } from '../../../shared/empty.util';
+import { PatchRequest } from '../request.models';
+import { getFirstSucceededRemoteData, getRemoteDataPayload } from '../../shared/operators';
+import { ChangeAnalyzer } from '../change-analyzer';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { RestRequestMethod } from '../rest-request-method';
+import { ConstructIdEndpoint, IdentifiableDataService } from './identifiable-data.service';
+
+
+/**
+ * Interface for a data service that can patch and update objects.
+ */
+export interface PatchData<T extends CacheableObject> {
+  /**
+   * Send a patch request for a specified object
+   * @param {T} object The object to send a patch request for
+   * @param {Operation[]} operations The patch operations to be performed
+   */
+  patch(object: T, operations: Operation[]): Observable<RemoteData<T>>;
+
+  /**
+   * Add a new patch to the object cache
+   * The patch is derived from the differences between the given object and its version in the object cache
+   * @param {DSpaceObject} object The given object
+   */
+  update(object: T): Observable<RemoteData<T>>;
+
+  /**
+   * Commit current object changes to the server
+   * @param method The RestRequestMethod for which de server sync buffer should be committed
+   */
+  commitUpdates(method?: RestRequestMethod): void;
+
+  /**
+   * Return a list of operations representing the difference between an object and its latest value in the cache.
+   * @param object  the object to resolve to a list of patch operations
+   */
+  createPatchFromCache(object: T): Observable<Operation[]>;
+}
+
+/**
+ * A DataService feature to patch and update objects.
+ *
+ * Concrete data services can use this feature by implementing {@link PatchData}
+ * and delegating its method to an inner instance of this class.
+ *
+ * Note that this feature requires the object in question to have an ID.
+ * Make sure to use the same {@link ConstructIdEndpoint} as in the parent data service.
+ */
+export class PatchDataImpl<T extends CacheableObject> extends IdentifiableDataService<T> implements PatchData<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected comparator: ChangeAnalyzer<T>,
+    protected responseMsToLive: number,
+    protected constructIdEndpoint: ConstructIdEndpoint,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive, constructIdEndpoint);
+    if (hasNoValue(constructIdEndpoint)) {
+      throw new Error(`PatchDataImpl initialized without a constructIdEndpoint method (linkPath: ${linkPath})`);
+    }
+  }
+
+  /**
+   * Send a patch request for a specified object
+   * @param {T} object The object to send a patch request for
+   * @param {Operation[]} operations The patch operations to be performed
+   */
+  patch(object: T, operations: Operation[]): Observable<RemoteData<T>> {
+    const requestId = this.requestService.generateRequestId();
+
+    const hrefObs = this.halService.getEndpoint(this.linkPath).pipe(
+      map((endpoint: string) => this.getIDHref(endpoint, object.uuid)),
+    );
+
+    hrefObs.pipe(
+      find((href: string) => hasValue(href)),
+    ).subscribe((href: string) => {
+      const request = new PatchRequest(requestId, href, operations);
+      if (hasValue(this.responseMsToLive)) {
+        request.responseMsToLive = this.responseMsToLive;
+      }
+      this.requestService.send(request);
+    });
+
+    return this.rdbService.buildFromRequestUUID(requestId);
+  }
+
+  /**
+   * Add a new patch to the object cache
+   * The patch is derived from the differences between the given object and its version in the object cache
+   * @param {DSpaceObject} object The given object
+   */
+  update(object: T): Observable<RemoteData<T>> {
+    return this.createPatchFromCache(object).pipe(
+      mergeMap((operations: Operation[]) => {
+        if (isNotEmpty(operations)) {
+          this.objectCache.addPatch(object._links.self.href, operations);
+        }
+        return this.findByHref(object._links.self.href, true, true);
+      }),
+    );
+  }
+
+  /**
+   * Commit current object changes to the server
+   * @param method The RestRequestMethod for which de server sync buffer should be committed
+   */
+  commitUpdates(method?: RestRequestMethod): void {
+    this.requestService.commit(method);
+  }
+
+  /**
+   * Return a list of operations representing the difference between an object and its latest value in the cache.
+   * @param object  the object to resolve to a list of patch operations
+   */
+  createPatchFromCache(object: T): Observable<Operation[]> {
+    const oldVersion$ = this.findByHref(object._links.self.href, true, false);
+    return oldVersion$.pipe(
+      getFirstSucceededRemoteData(),
+      getRemoteDataPayload(),
+      map((oldVersion: T) => this.comparator.diff(oldVersion, object)),
+    );
+  }
+}

src/app/core/data/base/put-data.spec.ts

@@ -0,0 +1,176 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+import { FindListOptions } from '../find-list-options.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { HALEndpointServiceStub } from '../../../shared/testing/hal-endpoint-service.stub';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+import { RemoteData } from '../remote-data';
+import { RequestEntryState } from '../request-entry-state.model';
+import { PutData, PutDataImpl } from './put-data';
+import { RestRequestMethod } from '../rest-request-method';
+import { DSpaceObject } from '../../shared/dspace-object.model';
+
+/**
+ * Tests whether calls to `PutData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testPutDataImplementation(serviceFactory: () => PutData<any>) {
+  let service;
+
+  describe('PutData implementation', () => {
+    const OBJ = Object.assign(new DSpaceObject(), {
+      uuid: '08eec68f-45e4-47a3-80c5-f0beb5627079',
+    });
+
+    beforeAll(() => {
+      service = serviceFactory();
+      (service as any).putData = jasmine.createSpyObj('putData', {
+        put: 'TEST put',
+      });
+    });
+
+    it('should handle calls to put', () => {
+      const out: any = service.put(OBJ);
+
+      expect((service as any).putData.put).toHaveBeenCalledWith(OBJ);
+      expect(out).toBe('TEST put');
+    });
+  });
+}
+
+
+const endpoint = 'https://rest.api/core';
+
+class TestService extends PutDataImpl<any> {
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+  ) {
+    super(undefined, requestService, rdbService, objectCache, halService, undefined);
+  }
+
+  public getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return observableOf(endpoint);
+  }
+}
+
+describe('PutDataImpl', () => {
+  let service: TestService;
+  let requestService;
+  let halService;
+  let rdbService;
+  let objectCache;
+  let selfLink;
+  let remoteDataMocks;
+
+  let obj;
+  let buildFromRequestUUIDSpy: jasmine.Spy;
+
+  function initTestService(): TestService {
+    requestService = getMockRequestService();
+    halService = new HALEndpointServiceStub('url') as any;
+    rdbService = getMockRemoteDataBuildService();
+    objectCache = {
+
+      addPatch: () => {
+        /* empty */
+      },
+      getObjectBySelfLink: () => {
+        /* empty */
+      },
+      getByHref: () => {
+        /* empty */
+      },
+    } as any;
+    selfLink = 'https://rest.api/endpoint/1698f1d3-be98-4c51-9fd8-6bfedcbd59b7';
+
+    const timeStamp = new Date().getTime();
+    const msToLive = 15 * 60 * 1000;
+    const payload = { foo: 'bar' };
+    const statusCodeSuccess = 200;
+    const statusCodeError = 404;
+    const errorMessage = 'not found';
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, msToLive, timeStamp, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Success, undefined, payload, statusCodeSuccess),
+      SuccessStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.SuccessStale, undefined, payload, statusCodeSuccess),
+      Error: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.Error, errorMessage, undefined, statusCodeError),
+      ErrorStale: new RemoteData(timeStamp, msToLive, timeStamp, RequestEntryState.ErrorStale, errorMessage, undefined, statusCodeError),
+    };
+
+    return new TestService(
+      requestService,
+      rdbService,
+      objectCache,
+      halService,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+
+    obj = Object.assign(new DSpaceObject(), {
+      uuid: '1698f1d3-be98-4c51-9fd8-6bfedcbd59b7',
+      metadata: {           // recognized properties will be serialized
+        ['dc.title']: [
+          { language: 'en', value: 'some object' },
+        ]
+      },
+      data: [ 1, 2, 3, 4 ], // unrecognized properties won't be serialized
+      _links: { self: { href: selfLink } },
+    });
+
+
+    buildFromRequestUUIDSpy = spyOn(rdbService, 'buildFromRequestUUID').and.returnValue(observableOf(remoteDataMocks.Success));
+  });
+
+  describe('put', () => {
+    it('should send a PUT request with the serialized object', (done) => {
+      service.put(obj).subscribe(() => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.PUT,
+          body: {  // _links are not serialized
+            uuid: obj.uuid,
+            metadata: obj.metadata
+          },
+        }));
+        done();
+      });
+    });
+
+    it('should send the PUT request to the object\'s self link', (done) => {
+      service.put(obj).subscribe(() => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.PUT,
+          href: selfLink,
+        }));
+        done();
+      });
+    });
+
+    it('should return the remote data for the sent request', (done) => {
+      service.put(obj).subscribe(out => {
+        expect(requestService.send).toHaveBeenCalledWith(jasmine.objectContaining({
+          method: RestRequestMethod.PUT,
+          uuid: requestService.generateRequestId(),
+        }));
+        expect(buildFromRequestUUIDSpy).toHaveBeenCalledWith(requestService.generateRequestId());
+        expect(out).toEqual(remoteDataMocks.Success);
+        done();
+      });
+    });
+  });
+});

src/app/core/data/base/put-data.ts

@@ -0,0 +1,69 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { BaseDataService } from './base-data.service';
+import { Observable } from 'rxjs';
+import { RemoteData } from '../remote-data';
+import { DSpaceSerializer } from '../../dspace-rest/dspace.serializer';
+import { GenericConstructor } from '../../shared/generic-constructor';
+import { PutRequest } from '../request.models';
+import { hasValue } from '../../../shared/empty.util';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+
+/**
+ * Interface for a data service that can send PUT requests.
+ */
+export interface PutData<T extends CacheableObject> {
+  /**
+   * Send a PUT request for the specified object
+   *
+   * @param object The object to send a put request for.
+   */
+  put(object: T): Observable<RemoteData<T>>;
+}
+
+/**
+ * A DataService feature to send PUT requests.
+ *
+ * Concrete data services can use this feature by implementing {@link PutData}
+ * and delegating its method to an inner instance of this class.
+ */
+export class PutDataImpl<T extends CacheableObject> extends BaseDataService<T> implements PutData<T> {
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected responseMsToLive: number,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive);
+  }
+
+  /**
+   * Send a PUT request for the specified object
+   *
+   * @param object The object to send a put request for.
+   */
+  put(object: T): Observable<RemoteData<T>> {
+    const requestId = this.requestService.generateRequestId();
+    const serializedObject = new DSpaceSerializer(object.constructor as GenericConstructor<{}>).serialize(object);
+    const request = new PutRequest(requestId, object._links.self.href, serializedObject);
+
+    if (hasValue(this.responseMsToLive)) {
+      request.responseMsToLive = this.responseMsToLive;
+    }
+
+    this.requestService.send(request);
+
+    return this.rdbService.buildFromRequestUUID(requestId);
+  }
+}

src/app/core/data/base/search-data.spec.ts

@@ -0,0 +1,141 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { constructSearchEndpointDefault, SearchData, SearchDataImpl } from './search-data';
+import { FindListOptions } from '../find-list-options.model';
+import { followLink } from '../../../shared/utils/follow-link-config.model';
+import { of as observableOf } from 'rxjs';
+import { getMockRequestService } from '../../../shared/mocks/request.service.mock';
+import { getMockRemoteDataBuildService } from '../../../shared/mocks/remote-data-build.service.mock';
+
+/**
+ * Tests whether calls to `SearchData` methods are correctly patched through in a concrete data service that implements it
+ */
+export function testSearchDataImplementation(serviceFactory: () => SearchData<any>) {
+  let service;
+
+  describe('SearchData implementation', () => {
+    const OPTIONS = Object.assign(new FindListOptions(), { elementsPerPage: 10, currentPage: 3 });
+    const FOLLOWLINKS = [
+      followLink('test'),
+      followLink('something'),
+    ];
+
+    beforeAll(() => {
+      service = serviceFactory();
+      (service as any).searchData = jasmine.createSpyObj('searchData', {
+        searchBy: 'TEST searchBy',
+      });
+    });
+
+    it('should handle calls to searchBy', () => {
+      const out: any = service.searchBy('searchMethod', OPTIONS, false, true, ...FOLLOWLINKS);
+
+      expect((service as any).searchData.searchBy).toHaveBeenCalledWith('searchMethod', OPTIONS, false, true, ...FOLLOWLINKS);
+      expect(out).toBe('TEST searchBy');
+    });
+  });
+}
+
+const endpoint = 'https://rest.api/core';
+
+describe('SearchDataImpl', () => {
+  let service: SearchDataImpl<any>;
+  let requestService;
+  let halService;
+  let rdbService;
+  let linksToFollow;
+
+  let constructSearchEndpointSpy;
+  let options;
+
+  function initTestService(): SearchDataImpl<any> {
+    requestService = getMockRequestService();
+    halService = jasmine.createSpyObj('halService', {
+      getEndpoint: observableOf(endpoint),
+    });
+    rdbService = getMockRemoteDataBuildService();
+    linksToFollow = [
+      followLink('a'),
+      followLink('b'),
+    ];
+
+    constructSearchEndpointSpy = jasmine.createSpy('constructSearchEndpointSpy').and.callFake(constructSearchEndpointDefault);
+
+    options = Object.assign(new FindListOptions(), {
+      elementsPerPage: 5,
+      currentPage: 3,
+    });
+
+    return new SearchDataImpl(
+      'test',
+      requestService,
+      rdbService,
+      undefined,
+      halService,
+      undefined,
+      constructSearchEndpointSpy,
+    );
+  }
+
+  beforeEach(() => {
+    service = initTestService();
+  });
+
+  describe('getSearchEndpoint', () => {
+    it('should return the search endpoint for the given method', (done) => {
+      (service as any).getSearchEndpoint('testMethod').subscribe(searchEndpoint => {
+        expect(halService.getEndpoint).toHaveBeenCalledWith('test');
+        expect(searchEndpoint).toBe('https://rest.api/core/search/testMethod');
+        done();
+      });
+    });
+
+    it('should use constructSearchEndpoint to construct the search endpoint', (done) => {
+      (service as any).getSearchEndpoint('testMethod').subscribe(() => {
+        expect(constructSearchEndpointSpy).toHaveBeenCalledWith('https://rest.api/core', 'testMethod');
+        done();
+      });
+    });
+  });
+
+  describe('getSearchByHref', () => {
+    beforeEach(() => {
+      spyOn(service as any, 'getSearchEndpoint').and.callThrough();
+      spyOn(service, 'buildHrefFromFindOptions').and.callThrough();
+    });
+
+    it('should return the search endpoint with additional query parameters', (done) => {
+      service.getSearchByHref('testMethod', options, ...linksToFollow).subscribe(href => {
+        expect((service as any).getSearchEndpoint).toHaveBeenCalledWith('testMethod');
+        expect(service.buildHrefFromFindOptions).toHaveBeenCalledWith(
+          'https://rest.api/core/search/testMethod',
+          options,
+          [],
+          ...linksToFollow,
+        );
+
+        expect(href).toBe('https://rest.api/core/search/testMethod?page=2&size=5&embed=a&embed=b');
+
+        done();
+      });
+    });
+  });
+
+  describe('searchBy', () => {
+    it('should patch getSearchEndpoint into findListByHref and return the result', () => {
+      spyOn(service, 'getSearchByHref').and.returnValue('endpoint' as any);
+      spyOn(service, 'findListByHref').and.returnValue('resulting remote data' as any);
+
+      const out: any = service.searchBy('testMethod', options, false, true, ...linksToFollow);
+
+      expect(service.getSearchByHref).toHaveBeenCalledWith('testMethod', options, ...linksToFollow);
+      expect(service.findListByHref).toHaveBeenCalledWith('endpoint', undefined, false, true, ...linksToFollow);
+      expect(out).toBe('resulting remote data');
+    });
+  });
+});

src/app/core/data/base/search-data.ts

@@ -0,0 +1,134 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+import { CacheableObject } from '../../cache/cacheable-object.model';
+import { BaseDataService } from './base-data.service';
+import { Observable } from 'rxjs';
+import { filter, map } from 'rxjs/operators';
+import { hasNoValue, isNotEmpty } from '../../../shared/empty.util';
+import { FindListOptions } from '../find-list-options.model';
+import { FollowLinkConfig } from '../../../shared/utils/follow-link-config.model';
+import { RemoteData } from '../remote-data';
+import { PaginatedList } from '../paginated-list.model';
+import { RequestService } from '../request.service';
+import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../../cache/object-cache.service';
+import { HALEndpointService } from '../../shared/hal-endpoint.service';
+
+/**
+ * Shorthand type for method to construct a search endpoint
+ */
+export type ConstructSearchEndpoint = (href: string, searchMethod: string) => string;
+
+/**
+ * Default method to construct a search endpoint
+ */
+export const constructSearchEndpointDefault = (href: string, searchMethod: string): string => `${href}/search/${searchMethod}`;
+
+/**
+ * Interface for a data service that can search for objects.
+ */
+export interface SearchData<T extends CacheableObject> {
+  /**
+   * Make a new FindListRequest with given search method
+   *
+   * @param searchMethod                The search method for the object
+   * @param options                     The [[FindListOptions]] object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>}
+   *    Return an observable that emits response from the server
+   */
+  searchBy(searchMethod: string, options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>>;
+}
+
+/**
+ * A DataService feature to search for objects.
+ *
+ * Concrete data services can use this feature by implementing {@link SearchData}
+ * and delegating its method to an inner instance of this class.
+ */
+export class SearchDataImpl<T extends CacheableObject> extends BaseDataService<T> implements SearchData<T> {
+  /**
+   * @param linkPath
+   * @param requestService
+   * @param rdbService
+   * @param objectCache
+   * @param halService
+   * @param responseMsToLive
+   * @param constructSearchEndpoint      an optional method to construct the search endpoint, passed as an argument so it can be
+   *                            modified without extending this class. Defaults to `${href}/search/${searchMethod}`
+   */
+  constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected responseMsToLive: number,
+    private constructSearchEndpoint: ConstructSearchEndpoint = constructSearchEndpointDefault,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService, responseMsToLive);
+    if (hasNoValue(constructSearchEndpoint)) {
+      throw new Error(`SearchDataImpl initialized without a constructSearchEndpoint method (linkPath: ${linkPath})`);
+    }
+  }
+
+  /**
+   * Make a new FindListRequest with given search method
+   *
+   * @param searchMethod                The search method for the object
+   * @param options                     The [[FindListOptions]] object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>}
+   *    Return an observable that emits response from the server
+   */
+  searchBy(searchMethod: string, options: FindListOptions = {}, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>> {
+    const hrefObs = this.getSearchByHref(searchMethod, options, ...linksToFollow);
+
+    return this.findListByHref(hrefObs, undefined, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Create the HREF for a specific object's search method with given options object
+   *
+   * @param searchMethod The search method for the object
+   * @param options The [[FindListOptions]] object
+   * @return {Observable<string>}
+   *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  getSearchByHref(searchMethod: string, options: FindListOptions = {}, ...linksToFollow: FollowLinkConfig<T>[]): Observable<string> {
+    let result$: Observable<string>;
+    const args = [];
+
+    result$ = this.getSearchEndpoint(searchMethod);
+
+    return result$.pipe(map((result: string) => this.buildHrefFromFindOptions(result, options, args, ...linksToFollow)));
+  }
+
+  /**
+   * Return object search endpoint by given search method
+   *
+   * @param searchMethod The search method for the object
+   */
+  private getSearchEndpoint(searchMethod: string): Observable<string> {
+    return this.halService.getEndpoint(this.linkPath).pipe(
+      filter((href: string) => isNotEmpty(href)),
+      map(href => this.constructSearchEndpoint(href, searchMethod)),
+    );
+  }
+}

src/app/core/data/bitstream-data.service.spec.ts

@@ -12,6 +12,9 @@ import { getMockRequestService } from '../../shared/mocks/request.service.mock';
 import { HALEndpointServiceStub } from '../../shared/testing/hal-endpoint-service.stub';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { getMockRemoteDataBuildService } from '../../shared/mocks/remote-data-build.service.mock';
+import { testSearchDataImplementation } from './base/search-data.spec';
+import { testPatchDataImplementation } from './base/patch-data.spec';
+import { testDeleteDataImplementation } from './base/delete-data.spec';
 
 describe('BitstreamDataService', () => {
   let service: BitstreamDataService;
@@ -47,7 +50,14 @@ describe('BitstreamDataService', () => {
     });
     rdbService = getMockRemoteDataBuildService();
 
-    service = new BitstreamDataService(requestService, rdbService, null, objectCache, halService, null, null, null, null, bitstreamFormatService);
+    service = new BitstreamDataService(requestService, rdbService, objectCache, halService, null, bitstreamFormatService, null, null);
+  });
+
+  describe('composition', () => {
+    const initService = () => new BitstreamDataService(null, null, null, null, null, null, null, null);
+    testSearchDataImplementation(initService);
+    testPatchDataImplementation(initService);
+    testDeleteDataImplementation(initService);
   });
 
   describe('when updating the bitstream\'s format', () => {

src/app/core/data/bitstream-data.service.ts

@@ -1,12 +1,9 @@
-import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { HttpHeaders } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Store } from '@ngrx/store';
 import { combineLatest as observableCombineLatest, Observable } from 'rxjs';
 import { map, switchMap, take } from 'rxjs/operators';
 import { hasValue } from '../../shared/empty.util';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { Bitstream } from '../shared/bitstream.model';
@@ -15,8 +12,6 @@ import { Bundle } from '../shared/bundle.model';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { Item } from '../shared/item.model';
 import { BundleDataService } from './bundle-data.service';
-import { DataService } from './data.service';
-import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
 import { buildPaginatedList, PaginatedList } from './paginated-list.model';
 import { RemoteData } from './remote-data';
 import { PutRequest } from './request.models';
@@ -28,36 +23,45 @@ import { createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.util
 import { PageInfo } from '../shared/page-info.model';
 import { RequestParam } from '../cache/models/request-param.model';
 import { sendRequest } from '../shared/request.operators';
-import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
+import { SearchData, SearchDataImpl } from './base/search-data';
+import { PatchData, PatchDataImpl } from './base/patch-data';
+import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
+import { RestRequestMethod } from './rest-request-method';
+import { DeleteData, DeleteDataImpl } from './base/delete-data';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { NoContent } from '../shared/NoContent.model';
+import { IdentifiableDataService } from './base/identifiable-data.service';
+import { dataService } from './base/data-service.decorator';
+import { Operation } from 'fast-json-patch';
 
 /**
  * A service to retrieve {@link Bitstream}s from the REST API
  */
 @Injectable({
-  providedIn: 'root'
+  providedIn: 'root',
 })
 @dataService(BITSTREAM)
-export class BitstreamDataService extends DataService<Bitstream> {
-
-  /**
-   * The HAL path to the bitstream endpoint
-   */
-  protected linkPath = 'bitstreams';
+export class BitstreamDataService extends IdentifiableDataService<Bitstream> implements SearchData<Bitstream>, PatchData<Bitstream>, DeleteData<Bitstream> {
+  private searchData: SearchDataImpl<Bitstream>;
+  private patchData: PatchDataImpl<Bitstream>;
+  private deleteData: DeleteDataImpl<Bitstream>;
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DSOChangeAnalyzer<Bitstream>,
     protected bundleService: BundleDataService,
-    protected bitstreamFormatService: BitstreamFormatDataService
+    protected bitstreamFormatService: BitstreamFormatDataService,
+    protected comparator: DSOChangeAnalyzer<Bitstream>,
+    protected notificationsService: NotificationsService,
   ) {
-    super();
+    super('bitstreams', requestService, rdbService, objectCache, halService);
+
+    this.searchData = new SearchDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, this.responseMsToLive);
+    this.patchData = new PatchDataImpl<Bitstream>(this.linkPath, requestService, rdbService, objectCache, halService, comparator, this.responseMsToLive, this.constructIdEndpoint);
+    this.deleteData = new DeleteDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, notificationsService, this.responseMsToLive, this.constructIdEndpoint);
   }
 
   /**
@@ -73,7 +77,7 @@ export class BitstreamDataService extends DataService<Bitstream> {
    *                                    {@link HALLink}s should be automatically resolved
    */
   findAllByBundle(bundle: Bundle, options?: FindListOptions, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<Bitstream>[]): Observable<RemoteData<PaginatedList<Bitstream>>> {
-    return this.findAllByHref(bundle._links.bitstreams.href, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+    return this.findListByHref(bundle._links.bitstreams.href, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
   }
 
   /**
@@ -180,8 +184,97 @@ export class BitstreamDataService extends DataService<Bitstream> {
       hrefObs,
       useCachedVersionIfAvailable,
       reRequestOnStale,
-      ...linksToFollow
+      ...linksToFollow,
     );
   }
 
+  /**
+   * Create the HREF for a specific object's search method with given options object
+   *
+   * @param searchMethod The search method for the object
+   * @param options The [[FindListOptions]] object
+   * @return {Observable<string>}
+   *    Return an observable that emits created HREF
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   */
+  public getSearchByHref(searchMethod: string, options?: FindListOptions, ...linksToFollow: FollowLinkConfig<Bitstream>[]): Observable<string> {
+    return this.searchData.getSearchByHref(searchMethod, options, ...linksToFollow);
+  }
+
+  /**
+   * Make a new FindListRequest with given search method
+   *
+   * @param searchMethod                The search method for the object
+   * @param options                     The [[FindListOptions]] object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>}
+   *    Return an observable that emits response from the server
+   */
+  public searchBy(searchMethod: string, options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<Bitstream>[]): Observable<RemoteData<PaginatedList<Bitstream>>> {
+    return this.searchData.searchBy(searchMethod, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Commit current object changes to the server
+   * @param method The RestRequestMethod for which de server sync buffer should be committed
+   */
+  public commitUpdates(method?: RestRequestMethod): void {
+    this.patchData.commitUpdates(method);
+  }
+
+  /**
+   * Send a patch request for a specified object
+   * @param {T} object The object to send a patch request for
+   * @param {Operation[]} operations The patch operations to be performed
+   */
+  public patch(object: Bitstream, operations: []): Observable<RemoteData<Bitstream>> {
+    return this.patchData.patch(object, operations);
+  }
+
+  /**
+   * Add a new patch to the object cache
+   * The patch is derived from the differences between the given object and its version in the object cache
+   * @param {DSpaceObject} object The given object
+   */
+  public update(object: Bitstream): Observable<RemoteData<Bitstream>> {
+    return this.patchData.update(object);
+  }
+
+  /**
+   * Return a list of operations representing the difference between an object and its latest value in the cache.
+   * @param object  the object to resolve to a list of patch operations
+   */
+  public createPatchFromCache(object: Bitstream): Observable<Operation[]> {
+    return this.patchData.createPatchFromCache(object);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   objectId The id of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   */
+  delete(objectId: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.delete(objectId, copyVirtualMetadata);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   href The self link of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   *          Only emits once all request related to the DSO has been invalidated.
+   */
+  deleteByHref(href: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.deleteByHref(href, copyVirtualMetadata);
+  }
 }

src/app/core/data/bitstream-format-data.service.spec.ts

@@ -6,19 +6,16 @@ import { ObjectCacheService } from '../cache/object-cache.service';
 import { cold, getTestScheduler, hot } from 'jasmine-marbles';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { BitstreamFormat } from '../shared/bitstream-format.model';
 import { waitForAsync } from '@angular/core/testing';
-import {
-  BitstreamFormatsRegistryDeselectAction,
-  BitstreamFormatsRegistryDeselectAllAction,
-  BitstreamFormatsRegistrySelectAction
-} from '../../admin/admin-registries/bitstream-formats/bitstream-format.actions';
+import { BitstreamFormatsRegistryDeselectAction, BitstreamFormatsRegistryDeselectAllAction, BitstreamFormatsRegistrySelectAction } from '../../admin/admin-registries/bitstream-formats/bitstream-format.actions';
 import { TestScheduler } from 'rxjs/testing';
 import { createSuccessfulRemoteDataObject } from '../../shared/remote-data.utils';
 import { CoreState } from '../core-state.model';
 import { RequestEntry } from './request-entry.model';
+import { testFindAllDataImplementation } from './base/find-all-data.spec';
+import { testDeleteDataImplementation } from './base/delete-data.spec';
 
 describe('BitstreamFormatDataService', () => {
   let service: BitstreamFormatDataService;
@@ -50,8 +47,6 @@ describe('BitstreamFormatDataService', () => {
   } as HALEndpointService;
 
   const notificationsService = {} as NotificationsService;
-  const http = {} as HttpClient;
-  const comparator = {} as any;
 
   let rd;
   let rdbService: RemoteDataBuildService;
@@ -59,21 +54,26 @@ describe('BitstreamFormatDataService', () => {
   function initTestService(halService) {
     rd = createSuccessfulRemoteDataObject({});
     rdbService = jasmine.createSpyObj('rdbService', {
-      buildFromRequestUUID: observableOf(rd)
+      buildFromRequestUUID: observableOf(rd),
+      buildFromRequestUUIDAndAwait: observableOf(rd),
     });
 
     return new BitstreamFormatDataService(
       requestService,
       rdbService,
-      store,
       objectCache,
       halService,
       notificationsService,
-      http,
-      comparator
+      store,
     );
   }
 
+  describe('composition', () => {
+    const initService = () => new BitstreamFormatDataService(null, null, null, null, null, null);
+    testFindAllDataImplementation(initService);
+    testDeleteDataImplementation(initService);
+  });
+
   describe('getBrowseEndpoint', () => {
     beforeEach(waitForAsync(() => {
       scheduler = getTestScheduler();

src/app/core/data/bitstream-format-data.service.ts

@@ -1,16 +1,10 @@
-import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
 import { createSelector, select, Store } from '@ngrx/store';
 import { Observable } from 'rxjs';
 import { distinctUntilChanged, map, tap } from 'rxjs/operators';
-import {
-  BitstreamFormatsRegistryDeselectAction,
-  BitstreamFormatsRegistryDeselectAllAction,
-  BitstreamFormatsRegistrySelectAction
-} from '../../admin/admin-registries/bitstream-formats/bitstream-format.actions';
+import { BitstreamFormatsRegistryDeselectAction, BitstreamFormatsRegistryDeselectAllAction, BitstreamFormatsRegistrySelectAction } from '../../admin/admin-registries/bitstream-formats/bitstream-format.actions';
 import { BitstreamFormatRegistryState } from '../../admin/admin-registries/bitstream-formats/bitstream-format.reducers';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { coreSelector } from '../core.selectors';
@@ -18,40 +12,53 @@ import { BitstreamFormat } from '../shared/bitstream-format.model';
 import { BITSTREAM_FORMAT } from '../shared/bitstream-format.resource-type';
 import { Bitstream } from '../shared/bitstream.model';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { DataService } from './data.service';
-import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
 import { RemoteData } from './remote-data';
 import { PostRequest, PutRequest } from './request.models';
 import { RequestService } from './request.service';
 import { sendRequest } from '../shared/request.operators';
 import { CoreState } from '../core-state.model';
+import { IdentifiableDataService } from './base/identifiable-data.service';
+import { DeleteData, DeleteDataImpl } from './base/delete-data';
+import { FindAllData, FindAllDataImpl } from './base/find-all-data';
+import { FollowLinkConfig } from 'src/app/shared/utils/follow-link-config.model';
+import { FindListOptions } from './find-list-options.model';
+import { PaginatedList } from './paginated-list.model';
+import { NoContent } from '../shared/NoContent.model';
+import { dataService } from './base/data-service.decorator';
 
 const bitstreamFormatsStateSelector = createSelector(
   coreSelector,
-  (state: CoreState) => state.bitstreamFormats
+  (state: CoreState) => state.bitstreamFormats,
+);
+const selectedBitstreamFormatSelector = createSelector(
+  bitstreamFormatsStateSelector,
+  (bitstreamFormatRegistryState: BitstreamFormatRegistryState) => bitstreamFormatRegistryState.selectedBitstreamFormats,
 );
-const selectedBitstreamFormatSelector = createSelector(bitstreamFormatsStateSelector,
-  (bitstreamFormatRegistryState: BitstreamFormatRegistryState) => bitstreamFormatRegistryState.selectedBitstreamFormats);
 
 /**
  * A service responsible for fetching/sending data from/to the REST API on the bitstreamformats endpoint
  */
 @Injectable()
 @dataService(BITSTREAM_FORMAT)
-export class BitstreamFormatDataService extends DataService<BitstreamFormat> {
+export class BitstreamFormatDataService extends IdentifiableDataService<BitstreamFormat> implements FindAllData<BitstreamFormat>, DeleteData<BitstreamFormat> {
 
   protected linkPath = 'bitstreamformats';
 
+  private findAllData: FindAllDataImpl<BitstreamFormat>;
+  private deleteData: DeleteDataImpl<BitstreamFormat>;
+
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
     protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<BitstreamFormat>) {
-    super();
+    protected store: Store<CoreState>,
+  ) {
+    super('bitstreamformats', requestService, rdbService, objectCache, halService);
+
+    this.findAllData = new FindAllDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, this.responseMsToLive);
+    this.deleteData = new DeleteDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, notificationsService, this.responseMsToLive, this.constructIdEndpoint);
   }
 
   /**
@@ -60,7 +67,7 @@ export class BitstreamFormatDataService extends DataService<BitstreamFormat> {
    */
   public getUpdateEndpoint(formatId: string): Observable<string> {
     return this.getBrowseEndpoint().pipe(
-      map((endpoint: string) => this.getIDHref(endpoint, formatId))
+      map((endpoint: string) => this.getIDHref(endpoint, formatId)),
     );
   }
 
@@ -147,4 +154,47 @@ export class BitstreamFormatDataService extends DataService<BitstreamFormat> {
   findByBitstream(bitstream: Bitstream): Observable<RemoteData<BitstreamFormat>> {
     return this.findByHref(bitstream._links.format.href);
   }
+
+  /**
+   * Returns {@link RemoteData} of all object with a list of {@link FollowLinkConfig}, to indicate which embedded
+   * info should be added to the objects
+   *
+   * @param options                     Find list options object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>>}
+   *    Return an observable that emits object list
+   */
+  findAll(options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<BitstreamFormat>[]): Observable<RemoteData<PaginatedList<BitstreamFormat>>> {
+    return this.findAllData.findAll(options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   objectId The id of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   */
+  delete(objectId: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.delete(objectId, copyVirtualMetadata);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   href The self link of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   *          Only emits once all request related to the DSO has been invalidated.
+   */
+  deleteByHref(href: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.deleteByHref(href, copyVirtualMetadata);
+  }
 }

src/app/core/data/bundle-data.service.spec.ts

@@ -13,6 +13,7 @@ import { createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.util
 import { createPaginatedList } from '../../shared/testing/utils.test';
 import { Bundle } from '../shared/bundle.model';
 import { CoreState } from '../core-state.model';
+import { testPatchDataImplementation } from './base/patch-data.spec';
 
 class DummyChangeAnalyzer implements ChangeAnalyzer<Item> {
   diff(object1: Item, object2: Item): Operation[] {
@@ -64,9 +65,6 @@ describe('BundleDataService', () => {
       store,
       objectCache,
       halService,
-      notificationsService,
-      http,
-      comparator,
     );
   }
 
@@ -74,14 +72,20 @@ describe('BundleDataService', () => {
     service = initTestService();
   });
 
+  describe('composition', () => {
+    const initService = () => new BundleDataService(null, null, null, null, null);
+
+    testPatchDataImplementation(initService);
+  });
+
   describe('findAllByItem', () => {
     beforeEach(() => {
-      spyOn(service, 'findAllByHref');
+      spyOn(service, 'findListByHref');
       service.findAllByItem(item);
     });
 
-    it('should call findAllByHref with the item\'s bundles link', () => {
-      expect(service.findAllByHref).toHaveBeenCalledWith(bundleLink, undefined, true, true);
+    it('should call findListByHref with the item\'s bundles link', () => {
+      expect(service.findListByHref).toHaveBeenCalledWith(bundleLink, undefined, true, true);
     });
   });
 

src/app/core/data/bundle-data.service.ts

@@ -1,20 +1,14 @@
-import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Store } from '@ngrx/store';
 import { Observable } from 'rxjs';
 import { map, switchMap, take } from 'rxjs/operators';
 import { hasValue } from '../../shared/empty.util';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { Bundle } from '../shared/bundle.model';
 import { BUNDLE } from '../shared/bundle.resource-type';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { Item } from '../shared/item.model';
-import { DataService } from './data.service';
-import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
 import { PaginatedList } from './paginated-list.model';
 import { RemoteData } from './remote-data';
 import { GetRequest } from './request.models';
@@ -22,30 +16,36 @@ import { RequestService } from './request.service';
 import { PaginatedSearchOptions } from '../../shared/search/models/paginated-search-options.model';
 import { Bitstream } from '../shared/bitstream.model';
 import { RequestEntryState } from './request-entry-state.model';
-import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
+import { IdentifiableDataService } from './base/identifiable-data.service';
+import { PatchData, PatchDataImpl } from './base/patch-data';
+import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
+import { RestRequestMethod } from './rest-request-method';
+import { Operation } from 'fast-json-patch';
+import { dataService } from './base/data-service.decorator';
 
 /**
  * A service to retrieve {@link Bundle}s from the REST API
  */
 @Injectable(
-  {providedIn: 'root'}
+  { providedIn: 'root' },
 )
 @dataService(BUNDLE)
-export class BundleDataService extends DataService<Bundle> {
-  protected linkPath = 'bundles';
-  protected bitstreamsEndpoint = 'bitstreams';
+export class BundleDataService extends IdentifiableDataService<Bundle> implements PatchData<Bundle> {
+  private bitstreamsEndpoint = 'bitstreams';
+
+  private patchData: PatchDataImpl<Bundle>;
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
-    protected notificationsService: NotificationsService,
-    protected http: HttpClient,
-    protected comparator: DefaultChangeAnalyzer<Bundle>) {
-    super();
+    protected comparator: DSOChangeAnalyzer<Bundle>,
+  ) {
+    super('bundles', requestService, rdbService, objectCache, halService);
+
+    this.patchData = new PatchDataImpl<Bundle>(this.linkPath, requestService, rdbService, objectCache, halService, comparator, this.responseMsToLive, this.constructIdEndpoint);
   }
 
   /**
@@ -61,7 +61,7 @@ export class BundleDataService extends DataService<Bundle> {
    *                                    {@link HALLink}s should be automatically resolved
    */
   findAllByItem(item: Item, options?: FindListOptions, useCachedVersionIfAvailable = true, reRequestOnStale = true, ...linksToFollow: FollowLinkConfig<Bundle>[]): Observable<RemoteData<PaginatedList<Bundle>>> {
-    return this.findAllByHref(item._links.bundles.href, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+    return this.findListByHref(item._links.bundles.href, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
   }
 
   /**
@@ -133,7 +133,7 @@ export class BundleDataService extends DataService<Bundle> {
     const hrefObs = this.getBitstreamsEndpoint(bundleId, searchOptions);
 
     hrefObs.pipe(
-      take(1)
+      take(1),
     ).subscribe((href) => {
       const request = new GetRequest(this.requestService.generateRequestId(), href);
       this.requestService.send(request, true);
@@ -141,4 +141,38 @@ export class BundleDataService extends DataService<Bundle> {
 
     return this.rdbService.buildList<Bitstream>(hrefObs, ...linksToFollow);
   }
+
+  /**
+   * Commit current object changes to the server
+   * @param method The RestRequestMethod for which de server sync buffer should be committed
+   */
+  public commitUpdates(method?: RestRequestMethod): void {
+    this.patchData.commitUpdates(method);
+  }
+
+  /**
+   * Send a patch request for a specified object
+   * @param {T} object The object to send a patch request for
+   * @param {Operation[]} operations The patch operations to be performed
+   */
+  public patch(object: Bundle, operations: Operation[]): Observable<RemoteData<Bundle>> {
+    return this.patchData.patch(object, operations);
+  }
+
+  /**
+   * Add a new patch to the object cache
+   * The patch is derived from the differences between the given object and its version in the object cache
+   * @param {DSpaceObject} object The given object
+   */
+  public update(object: Bundle): Observable<RemoteData<Bundle>> {
+    return this.patchData.update(object);
+  }
+
+  /**
+   * Return a list of operations representing the difference between an object and its latest value in the cache.
+   * @param object  the object to resolve to a list of patch operations
+   */
+  public createPatchFromCache(object: Bundle): Observable<Operation[]> {
+    return this.patchData.createPatchFromCache(object);
+  }
 }

src/app/core/data/collection-data.service.spec.ts

@@ -13,16 +13,17 @@ import { RemoteDataBuildService } from '../cache/builders/remote-data-build.serv
 import { Collection } from '../shared/collection.model';
 import { PageInfo } from '../shared/page-info.model';
 import { buildPaginatedList } from './paginated-list.model';
-import {
-  createFailedRemoteDataObject$,
-  createSuccessfulRemoteDataObject,
-  createSuccessfulRemoteDataObject$
-} from '../../shared/remote-data.utils';
+import { createFailedRemoteDataObject$, createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.utils';
 import { cold, getTestScheduler, hot } from 'jasmine-marbles';
 import { TestScheduler } from 'rxjs/testing';
 import { Observable } from 'rxjs';
 import { RemoteData } from './remote-data';
 import { hasNoValue } from '../../shared/empty.util';
+import { testCreateDataImplementation } from './base/create-data.spec';
+import { testFindAllDataImplementation } from './base/find-all-data.spec';
+import { testSearchDataImplementation } from './base/search-data.spec';
+import { testPatchDataImplementation } from './base/patch-data.spec';
+import { testDeleteDataImplementation } from './base/delete-data.spec';
 
 const url = 'fake-url';
 const collectionId = 'fake-collection-id';
@@ -75,6 +76,16 @@ describe('CollectionDataService', () => {
   const paginatedList = buildPaginatedList(pageInfo, array);
   const paginatedListRD = createSuccessfulRemoteDataObject(paginatedList);
 
+  describe('composition', () => {
+    const initService = () => new CollectionDataService(null, null, null, null, null, null, null, null, null);
+
+    testCreateDataImplementation(initService);
+    testFindAllDataImplementation(initService);
+    testSearchDataImplementation(initService);
+    testPatchDataImplementation(initService);
+    testDeleteDataImplementation(initService);
+  });
+
   describe('when the requests are successful', () => {
     beforeEach(() => {
       createService();
@@ -201,7 +212,7 @@ describe('CollectionDataService', () => {
     notificationsService = new NotificationsServiceStub();
     translate = getMockTranslateService();
 
-    service = new CollectionDataService(requestService, rdbService, null, null, objectCache, halService, notificationsService, null, null, null, translate);
+    service = new CollectionDataService(requestService, rdbService, objectCache, halService, null, notificationsService, null, null, translate);
   }
 
 });

src/app/core/data/collection-data.service.ts

@@ -1,6 +1,5 @@
-import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { HttpHeaders } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Store } from '@ngrx/store';
 import { TranslateService } from '@ngx-translate/core';
 import { Observable } from 'rxjs';
 import { filter, map, switchMap, take } from 'rxjs/operators';
@@ -9,7 +8,6 @@ import { NotificationOptions } from '../../shared/notifications/models/notificat
 import { INotification } from '../../shared/notifications/models/notification.model';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { RequestParam } from '../cache/models/request-param.model';
 import { ObjectCacheService } from '../cache/object-cache.service';
@@ -33,30 +31,28 @@ import {
 import { RequestService } from './request.service';
 import { BitstreamDataService } from './bitstream-data.service';
 import { RestRequest } from './rest-request.model';
-import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
+import { Community } from '../shared/community.model';
+import { dataService } from './base/data-service.decorator';
 
 @Injectable()
 @dataService(COLLECTION)
 export class CollectionDataService extends ComColDataService<Collection> {
-  protected linkPath = 'collections';
   protected errorTitle = 'collection.source.update.notifications.error.title';
   protected contentSourceError = 'collection.source.update.notifications.error.content';
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
-    protected cds: CommunityDataService,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
+    protected comparator: DSOChangeAnalyzer<Community>,
     protected notificationsService: NotificationsService,
-    protected http: HttpClient,
     protected bitstreamDataService: BitstreamDataService,
-    protected comparator: DSOChangeAnalyzer<Collection>,
-    protected translate: TranslateService
+    protected communityDataService: CommunityDataService,
+    protected translate: TranslateService,
   ) {
-    super();
+    super('collections', requestService, rdbService, objectCache, halService, comparator, notificationsService, bitstreamDataService);
   }
 
   /**
@@ -284,15 +280,15 @@ export class CollectionDataService extends ComColDataService<Collection> {
    * @param findListOptions Pagination and search options.
    */
   findMappedCollectionsFor(item: Item, findListOptions?: FindListOptions): Observable<RemoteData<PaginatedList<Collection>>> {
-    return this.findAllByHref(item._links.mappedCollections.href, findListOptions);
+    return this.findListByHref(item._links.mappedCollections.href, findListOptions);
   }
 
 
   protected getScopeCommunityHref(options: FindListOptions) {
-    return this.cds.getEndpoint().pipe(
-      map((endpoint: string) => this.cds.getIDHref(endpoint, options.scopeID)),
+    return this.communityDataService.getEndpoint().pipe(
+      map((endpoint: string) => this.communityDataService.getIDHref(endpoint, options.scopeID)),
       filter((href: string) => isNotEmpty(href)),
-      take(1)
+      take(1),
     );
   }
 }

src/app/core/data/comcol-data.service.spec.ts

@@ -13,16 +13,16 @@ import { ComColDataService } from './comcol-data.service';
 import { CommunityDataService } from './community-data.service';
 import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
 import { RequestService } from './request.service';
-import {
-  createFailedRemoteDataObject$,
-  createSuccessfulRemoteDataObject$,
-  createFailedRemoteDataObject,
-  createSuccessfulRemoteDataObject
-} from '../../shared/remote-data.utils';
+import { createFailedRemoteDataObject, createFailedRemoteDataObject$, createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../../shared/remote-data.utils';
 import { BitstreamDataService } from './bitstream-data.service';
 import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
 import { Bitstream } from '../shared/bitstream.model';
+import { testCreateDataImplementation } from './base/create-data.spec';
+import { testFindAllDataImplementation } from './base/find-all-data.spec';
+import { testSearchDataImplementation } from './base/search-data.spec';
+import { testPatchDataImplementation } from './base/patch-data.spec';
+import { testDeleteDataImplementation } from './base/delete-data.spec';
 
 const LINK_NAME = 'test';
 
@@ -47,7 +47,7 @@ class TestService extends ComColDataService<any> {
     protected comparator: DSOChangeAnalyzer<Community>,
     protected linkPath: string
   ) {
-    super();
+    super('something', requestService, rdbService, objectCache, halService, comparator, notificationsService, bitstreamDataService);
   }
 
   protected getFindByParentHref(parentUUID: string): Observable<string> {
@@ -154,6 +154,15 @@ describe('ComColDataService', () => {
     service = initTestService();
   });
 
+  describe('composition', () => {
+    const initService = () => new TestService(null, null, null, null, null, null, null, null, null, null, null);
+    testCreateDataImplementation(initService);
+    testFindAllDataImplementation(initService);
+    testSearchDataImplementation(initService);
+    testPatchDataImplementation(initService);
+    testDeleteDataImplementation(initService);
+  });
+
   describe('getBrowseEndpoint', () => {
     it(`should call createAndSendGetRequest with the scope Community's self link`, () => {
       testScheduler.run(({ cold, flush, expectObservable }) => {

src/app/core/data/comcol-data.service.ts

@@ -4,7 +4,6 @@ import { hasValue, isEmpty, isNotEmpty } from '../../shared/empty.util';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { Community } from '../shared/community.model';
 import { HALLink } from '../shared/hal-link.model';
-import { DataService } from './data.service';
 import { PaginatedList } from './paginated-list.model';
 import { RemoteData } from './remote-data';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
@@ -17,11 +16,45 @@ import { createFailedRemoteDataObject$ } from '../../shared/remote-data.utils';
 import { URLCombiner } from '../url-combiner/url-combiner';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
 import { FindListOptions } from './find-list-options.model';
+import { IdentifiableDataService } from './base/identifiable-data.service';
+import { PatchData, PatchDataImpl } from './base/patch-data';
+import { DeleteData, DeleteDataImpl } from './base/delete-data';
+import { FindAllData, FindAllDataImpl } from './base/find-all-data';
+import { SearchData, SearchDataImpl } from './base/search-data';
+import { RestRequestMethod } from './rest-request-method';
+import { CreateData, CreateDataImpl } from './base/create-data';
+import { RequestParam } from '../cache/models/request-param.model';
+import { RequestService } from './request.service';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
+import { Operation } from 'fast-json-patch';
 
-export abstract class ComColDataService<T extends Community | Collection> extends DataService<T> {
-  protected abstract objectCache: ObjectCacheService;
-  protected abstract halService: HALEndpointService;
-  protected abstract bitstreamDataService: BitstreamDataService;
+export abstract class ComColDataService<T extends Community | Collection> extends IdentifiableDataService<T> implements CreateData<T>, FindAllData<T>, SearchData<T>, PatchData<T>, DeleteData<T> {
+  private createData: CreateData<T>;
+  private findAllData: FindAllData<T>;
+  private searchData: SearchData<T>;
+  private patchData: PatchData<T>;
+  private deleteData: DeleteData<T>;
+
+  protected constructor(
+    protected linkPath: string,
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected comparator: DSOChangeAnalyzer<T>,
+    protected notificationsService: NotificationsService,
+    protected bitstreamDataService: BitstreamDataService,
+  ) {
+    super(linkPath, requestService, rdbService, objectCache, halService);
+
+    this.createData = new CreateDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, notificationsService, this.responseMsToLive);
+    this.findAllData = new FindAllDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, this.responseMsToLive);
+    this.searchData = new SearchDataImpl<T>(this.linkPath, requestService, rdbService, objectCache, halService, this.responseMsToLive);
+    this.patchData = new PatchDataImpl<T>(this.linkPath, requestService, rdbService, objectCache, halService, comparator, this.responseMsToLive, this.constructIdEndpoint);
+    this.deleteData = new DeleteDataImpl(this.linkPath, requestService, rdbService, objectCache, halService, notificationsService, this.responseMsToLive, this.constructIdEndpoint);
+  }
 
   /**
    * Get the scoped endpoint URL by fetching the object with
@@ -66,7 +99,7 @@ export abstract class ComColDataService<T extends Community | Collection> extend
     const href$ = this.getFindByParentHref(parentUUID).pipe(
       map((href: string) => this.buildHrefFromFindOptions(href, options))
     );
-    return this.findAllByHref(href$, options, true, true, ...linksToFollow);
+    return this.findListByHref(href$, options, true, true, ...linksToFollow);
   }
 
   /**
@@ -129,4 +162,110 @@ export abstract class ComColDataService<T extends Community | Collection> extend
     const parentCommunity = dso._links.parentCommunity;
     return isNotEmpty(parentCommunity) ? parentCommunity.href : null;
   }
+
+
+  /**
+   * Create a new object on the server, and store the response in the object cache
+   *
+   * @param object    The object to create
+   * @param params    Array with additional params to combine with query string
+   */
+  create(object: T, ...params: RequestParam[]): Observable<RemoteData<T>> {
+    return this.createData.create(object, ...params);
+  }
+
+  /**
+   * Returns {@link RemoteData} of all object with a list of {@link FollowLinkConfig}, to indicate which embedded
+   * info should be added to the objects
+   *
+   * @param options                     Find list options object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>>}
+   *    Return an observable that emits object list
+   */
+  public findAll(options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>> {
+    return this.findAllData.findAll(options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Make a new FindListRequest with given search method
+   *
+   * @param searchMethod                The search method for the object
+   * @param options                     The [[FindListOptions]] object
+   * @param useCachedVersionIfAvailable If this is true, the request will only be sent if there's
+   *                                    no valid cached version. Defaults to true
+   * @param reRequestOnStale            Whether or not the request should automatically be re-
+   *                                    requested after the response becomes stale
+   * @param linksToFollow               List of {@link FollowLinkConfig} that indicate which
+   *                                    {@link HALLink}s should be automatically resolved
+   * @return {Observable<RemoteData<PaginatedList<T>>}
+   *    Return an observable that emits response from the server
+   */
+  public searchBy(searchMethod: string, options?: FindListOptions, useCachedVersionIfAvailable?: boolean, reRequestOnStale?: boolean, ...linksToFollow: FollowLinkConfig<T>[]): Observable<RemoteData<PaginatedList<T>>> {
+    return this.searchData.searchBy(searchMethod, options, useCachedVersionIfAvailable, reRequestOnStale, ...linksToFollow);
+  }
+
+  /**
+   * Commit current object changes to the server
+   * @param method The RestRequestMethod for which de server sync buffer should be committed
+   */
+  public commitUpdates(method?: RestRequestMethod): void {
+    this.patchData.commitUpdates(method);
+  }
+
+  /**
+   * Send a patch request for a specified object
+   * @param {T} object The object to send a patch request for
+   * @param {Operation[]} operations The patch operations to be performed
+   */
+  public patch(object: T, operations: []): Observable<RemoteData<T>> {
+    return this.patchData.patch(object, operations);
+  }
+
+  /**
+   * Add a new patch to the object cache
+   * The patch is derived from the differences between the given object and its version in the object cache
+   * @param {DSpaceObject} object The given object
+   */
+  public update(object: T): Observable<RemoteData<T>> {
+    return this.patchData.update(object);
+  }
+
+  /**
+   * Return a list of operations representing the difference between an object and its latest value in the cache.
+   * @param object  the object to resolve to a list of patch operations
+   */
+  public createPatchFromCache(object: T): Observable<Operation[]> {
+    return this.patchData.createPatchFromCache(object);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   objectId The id of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   */
+  public delete(objectId: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.delete(objectId, copyVirtualMetadata);
+  }
+
+  /**
+   * Delete an existing object on the server
+   * @param   href The self link of the object to be removed
+   * @param   copyVirtualMetadata (optional parameter) the identifiers of the relationship types for which the virtual
+   *                            metadata should be saved as real metadata
+   * @return  A RemoteData observable with an empty payload, but still representing the state of the request: statusCode,
+   *          errorMessage, timeCompleted, etc
+   *          Only emits once all request related to the DSO has been invalidated.
+   */
+  public deleteByHref(href: string, copyVirtualMetadata?: string[]): Observable<RemoteData<NoContent>> {
+    return this.deleteData.deleteByHref(href, copyVirtualMetadata);
+  }
 }

src/app/core/data/community-data.service.ts

@@ -1,11 +1,8 @@
-import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
 
-import { Store } from '@ngrx/store';
 import { Observable } from 'rxjs';
 import { filter, map, switchMap, take } from 'rxjs/operators';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { Community } from '../shared/community.model';
@@ -19,36 +16,36 @@ import { RequestService } from './request.service';
 import { BitstreamDataService } from './bitstream-data.service';
 import { FollowLinkConfig } from '../../shared/utils/follow-link-config.model';
 import { isNotEmpty } from '../../shared/empty.util';
-import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
+import { dataService } from './base/data-service.decorator';
 
 @Injectable()
 @dataService(COMMUNITY)
 export class CommunityDataService extends ComColDataService<Community> {
-  protected linkPath = 'communities';
   protected topLinkPath = 'search/top';
 
   constructor(
     protected requestService: RequestService,
     protected rdbService: RemoteDataBuildService,
-    protected store: Store<CoreState>,
     protected objectCache: ObjectCacheService,
     protected halService: HALEndpointService,
+    protected comparator: DSOChangeAnalyzer<Community>,
     protected notificationsService: NotificationsService,
     protected bitstreamDataService: BitstreamDataService,
-    protected http: HttpClient,
-    protected comparator: DSOChangeAnalyzer<Community>
   ) {
-    super();
+    super('communities', requestService, rdbService, objectCache, halService, comparator, notificationsService, bitstreamDataService);
   }
 
+  // this method is overridden in order to make it public
   getEndpoint() {
     return this.halService.getEndpoint(this.linkPath);
   }
 
   findTop(options: FindListOptions = {}, ...linksToFollow: FollowLinkConfig<Community>[]): Observable<RemoteData<PaginatedList<Community>>> {
-    const hrefObs = this.getFindAllHref(options, this.topLinkPath);
-    return this.findAllByHref(hrefObs, undefined, true, true, ...linksToFollow);
+    return this.getEndpoint().pipe(
+      map(href => `${href}/search/top`),
+      switchMap(href => this.findListByHref(href, options, true, true, ...linksToFollow))
+    );
   }
 
   protected getFindByParentHref(parentUUID: string): Observable<string> {

src/app/core/data/configuration-data.service.spec.ts

@@ -5,8 +5,6 @@ import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { GetRequest } from './request.models';
 import { RequestService } from './request.service';
 import { ObjectCacheService } from '../cache/object-cache.service';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient } from '@angular/common/http';
 import { ConfigurationDataService } from './configuration-data.service';
 import { ConfigurationProperty } from '../shared/configuration-property.model';
 
@@ -44,18 +42,12 @@ describe('ConfigurationDataService', () => {
       })
     });
     objectCache = {} as ObjectCacheService;
-    const notificationsService = {} as NotificationsService;
-    const http = {} as HttpClient;
-    const comparator = {} as any;
 
     service = new ConfigurationDataService(
       requestService,
       rdbService,
       objectCache,
       halService,
-      notificationsService,
-      http,
-      comparator
     );
   });