switched to resource-types for annotations to get around circular dependency issues

src/app/core/auth/models/auth-status.model.ts

@@ -42,7 +42,7 @@ export class AuthStatus implements CacheableObject {
   /**
    * The eperson of this auth status
    */
-  @link(EPerson)
+  @link(EPerson.type)
   eperson: Observable<RemoteData<EPerson>>;
 
   /**

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

@@ -88,23 +88,23 @@ export function getRelationships(target: any) {
   return relationshipMap.get(target);
 }
 
-export function dataService<T extends CacheableObject>(domainModelConstructor: GenericConstructor<T>): any {
+export function dataService(resourceType: ResourceType): any {
   return (target: any) => {
-    if (hasNoValue(domainModelConstructor)) {
+    if (hasNoValue(resourceType)) {
-      throw new Error(`Invalid @dataService annotation on ${target}, domainModelConstructor needs to be defined`);
+      throw new Error(`Invalid @dataService annotation on ${target}, resourceType needs to be defined`);
     }
-    const existingDataservice = dataServiceMap.get(domainModelConstructor);
+    const existingDataservice = dataServiceMap.get(resourceType.value);
 
     if (hasValue(existingDataservice)) {
-      throw new Error(`Multiple dataservices for ${domainModelConstructor}: ${existingDataservice} and ${target}`);
+      throw new Error(`Multiple dataservices for ${resourceType.value}: ${existingDataservice} and ${target}`);
     }
 
-    dataServiceMap.set(domainModelConstructor, target);
+    dataServiceMap.set(resourceType.value, target);
   };
 }
 
-export function getDataServiceFor<T extends CacheableObject>(domainModelConstructor: GenericConstructor<T>) {
+export function getDataServiceFor<T extends CacheableObject>(resourceType: ResourceType) {
-  return dataServiceMap.get(domainModelConstructor);
+  return dataServiceMap.get(resourceType.value);
 }
 
 export function resolvedLink<T extends DataService<any>, K extends keyof T>(provider: GenericConstructor<T>, methodName?: K, ...params: any[]): any {
@@ -135,20 +135,18 @@ export function getResolvedLinks(target: any) {
 }
 
 export class LinkDefinition<T extends HALResource> {
-  targetConstructor: GenericConstructor<CacheableObject>;
+  resourceType: ResourceType;
   isList = false;
   linkName: keyof T['_links'];
   propertyName: keyof T;
 }
 
 export const link = <T extends HALResource>(
-  targetConstructor: GenericConstructor<HALResource>,
+  resourceType: ResourceType,
   isList = false,
   linkName?: keyof T['_links'],
   ) => {
-  console.log('link call', targetConstructor, isList, linkName);
   return (target: T, propertyName: string) => {
-    console.log('link return', targetConstructor, isList, linkName, target, propertyName);
     let targetMap = linkMap.get(target.constructor);
 
     if (hasNoValue(targetMap)) {
@@ -160,7 +158,7 @@ export const link = <T extends HALResource>(
     }
 
     targetMap.set(propertyName, {
-      targetConstructor,
+      resourceType,
       isList,
       linkName,
       propertyName

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

@@ -21,10 +21,10 @@ export class LinkService {
     if (hasNoValue(matchingLinkDef)) {
       throw new Error(`followLink('${linkToFollow.name}') was used for a ${model.constructor.name}, but there is no property on ${model.constructor.name} models with an @link() for ${linkToFollow.name}`);
     } else {
-      const provider = getDataServiceFor(matchingLinkDef.targetConstructor);
+      const provider = getDataServiceFor(matchingLinkDef.resourceType);
 
       if (hasNoValue(provider)) {
-        throw new Error(`The @link() for ${linkToFollow.name} on ${model.constructor.name} models refers to a ${matchingLinkDef.targetConstructor.name}, but there is no service with an @dataService(${matchingLinkDef.targetConstructor.name}) annotation in order to retrieve it`);
+        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({

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

@@ -28,7 +28,7 @@ import { RequestService } from './request.service';
 @Injectable({
   providedIn: 'root'
 })
-@dataService(Bitstream)
+@dataService(Bitstream.type)
 export class BitstreamDataService extends DataService<Bitstream> {
 
   protected linkPath = 'bitstreams';

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

@@ -41,7 +41,7 @@ const selectedBitstreamFormatSelector = createSelector(bitstreamFormatsStateSele
  * A service responsible for fetching/sending data from/to the REST API on the bitstreamformats endpoint
  */
 @Injectable()
-@dataService(BitstreamFormat)
+@dataService(BitstreamFormat.type)
 export class BitstreamFormatDataService extends DataService<BitstreamFormat> {
 
   protected linkPath = 'bitstreamformats';

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

@@ -27,7 +27,7 @@ import { RequestService } from './request.service';
 @Injectable(
   {providedIn: 'root'}
 )
-@dataService(Bundle)
+@dataService(Bundle.type)
 export class BundleDataService extends DataService<Bundle> {
   protected linkPath = 'bundles';
   protected forceBypassCache = false;

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

@@ -49,7 +49,7 @@ import { INotification } from '../../shared/notifications/models/notification.mo
 import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
 
 @Injectable()
-@dataService(Collection)
+@dataService(Collection.type)
 export class CollectionDataService extends ComColDataService<Collection> {
   protected linkPath = 'collections';
   protected errorTitle = 'collection.source.update.notifications.error.title';

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

@@ -21,7 +21,7 @@ import { NormalizedObjectBuildService } from '../cache/builders/normalized-objec
 import { DSOChangeAnalyzer } from './dso-change-analyzer.service';
 
 @Injectable()
-@dataService(Community)
+@dataService(Community.type)
 export class CommunityDataService extends ComColDataService<Community> {
   protected linkPath = 'communities';
   protected topLinkPath = 'communities/search/top';

src/app/core/data/dspace-object-data.service.ts

@@ -39,7 +39,7 @@ class DataServiceImpl extends DataService<DSpaceObject> {
 }
 
 @Injectable()
-@dataService(DSpaceObject)
+@dataService(DSpaceObject.type)
 export class DSpaceObjectDataService {
   protected linkPath = 'dso';
   private dataService: DataServiceImpl;

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

@@ -41,7 +41,7 @@ import { PaginatedList } from './paginated-list';
 import { ExternalSourceEntry } from '../shared/external-source-entry.model';
 
 @Injectable()
-@dataService(Item)
+@dataService(Item.type)
 export class ItemDataService extends DataService<Item> {
   protected linkPath = 'items';
 

src/app/core/data/metadata-schema-data.service.ts

@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 import { Store } from '@ngrx/store';
-import { Observable } from 'rxjs';
 import { dataService } from '../cache/builders/build-decorators';
 import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
 import { CoreState } from '../core.reducers';
@@ -8,7 +7,6 @@ import { CoreState } from '../core.reducers';
 import { DataService } from './data.service';
 import { RequestService } from './request.service';
 import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { FindListOptions } from './request.models';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
 import { HttpClient } from '@angular/common/http';
@@ -40,7 +38,7 @@ class DataServiceImpl extends DataService<MetadataSchema> {
  * A service responsible for fetching/sending data from/to the REST API on the metadataschemas endpoint
  */
 @Injectable()
-@dataService(MetadataSchema)
+@dataService(MetadataSchema.type)
 export class MetadataSchemaDataService {
   private dataService: DataServiceImpl;
 

src/app/core/data/relationship-type.service.ts

@@ -28,7 +28,7 @@ import { FindListOptions, FindListRequest } from './request.models';
  * The service handling all relationship type requests
  */
 @Injectable()
-@dataService(RelationshipType)
+@dataService(RelationshipType.type)
 export class RelationshipTypeService extends DataService<RelationshipType> {
   protected linkPath = 'relationshiptypes';
 

src/app/core/data/relationship.service.ts

@@ -47,7 +47,7 @@ const relationshipStateSelector = (listID: string, itemID: string): MemoizedSele
  * The service handling all relationship requests
  */
 @Injectable()
-@dataService(Relationship)
+@dataService(Relationship.type)
 export class RelationshipService extends DataService<Relationship> {
   protected linkPath = 'relationships';
 

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

@@ -22,7 +22,7 @@ import { getSucceededRemoteData } from '../shared/operators';
  * Service responsible for handling requests related to the Site object
  */
 @Injectable()
-@dataService(Site)
+@dataService(Site.type)
 export class SiteDataService extends DataService<Site> {​
   protected linkPath = 'sites';
 

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

@@ -14,7 +14,7 @@ import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { EPerson } from './models/eperson.model';
 
 @Injectable()
-@dataService(EPerson)
+@dataService(EPerson.type)
 export class EPersonDataService extends DataService<EPerson> {
 
   protected linkPath: 'eperson/epersons';

src/app/core/metadata/metadata-field.model.ts

@@ -41,7 +41,7 @@ export class MetadataField extends ListableObject implements HALResource {
   /**
    * The metadata schema object of this metadata field
    */
-  @link(MetadataSchema)
+  @link(MetadataSchema.type)
   // TODO the responseparsingservice assumes schemas are always embedded. This should be remotedata instead.
   schema?: MetadataSchema;
 

src/app/core/shared/bitstream.model.ts

@@ -34,17 +34,17 @@ export class Bitstream extends DSpaceObject implements HALResource {
   /**
    * The Bitstream Format for this Bitstream
    */
-  @link(BitstreamFormat)
+  @link(BitstreamFormat.type)
   format?: Observable<RemoteData<BitstreamFormat>>;
 
   _links: {
-    // @link(Bitstream)
+    // @link(Bitstream.type)
     self: HALLink;
 
-    // @link(Bundle)
+    // @link(Bundle.type)
     bundle: HALLink;
 
-    // @link(BitstreamFormat)
+    // @link(BitstreamFormat.type)
     format: HALLink;
 
     content: HALLink;

src/app/core/shared/collection.model.ts

@@ -66,13 +66,13 @@ export class Collection extends DSpaceObject {
   /**
    * The Bitstream that represents the logo of this Collection
    */
-  @link(Bitstream)
+  @link(Bitstream.type)
   logo?: Observable<RemoteData<Bitstream>>;
 
   /**
    * The default access conditions of this Collection
    */
-  @link(ResourcePolicy, true)
+  @link(ResourcePolicy.type, true)
   defaultAccessConditions?: Observable<RemoteData<PaginatedList<ResourcePolicy>>>;
 
   _links: {

src/app/core/shared/community.model.ts

@@ -51,13 +51,13 @@ export class Community extends DSpaceObject {
   /**
    * The Bitstream that represents the logo of this Community
    */
-  @link(Bitstream)
+  @link(Bitstream.type)
   logo?: Observable<RemoteData<Bitstream>>;
 
-  @link(Collection, true)
+  @link(Collection.type, true)
   collections?: Observable<RemoteData<PaginatedList<Collection>>>;
 
-  @link(Community, true)
+  @link(Community.type, true)
   subcommunities?: Observable<RemoteData<PaginatedList<Community>>>;
 
   _links: {

src/app/core/shared/item-relationships/relationship-type.model.ts

@@ -65,13 +65,13 @@ export class RelationshipType implements CacheableObject {
   /**
    * The type of Item found to the left of this RelationshipType
    */
-  @link(ItemType)
+  @link(ItemType.type)
   leftType?: Observable<RemoteData<ItemType>>;
 
   /**
    * The type of Item found to the right of this RelationshipType
    */
-  @link(ItemType)
+  @link(ItemType.type)
   rightType?: Observable<RemoteData<ItemType>>;
 
   _links: {

src/app/core/shared/item-relationships/relationship.model.ts

@@ -3,15 +3,16 @@ import { link } from '../../cache/builders/build-decorators';
 import { CacheableObject } from '../../cache/object-cache.reducer';
 import { RemoteData } from '../../data/remote-data';
 import { HALLink } from '../hal-link.model';
-import { ResourceType } from '../resource-type';
 import { RelationshipType } from './relationship-type.model';
 import { Item } from '../item.model';
+import { ITEM } from "../item-resource-type";
+import { RELATIONSHIP } from "../relationship.resource-type";
 
 /**
  * Describes a Relationship between two Items
  */
 export class Relationship implements CacheableObject {
-  static type = new ResourceType('relationship');
+  static type = RELATIONSHIP;
 
   /**
    * The link to the rest endpoint where this object can be found
@@ -32,14 +33,13 @@ export class Relationship implements CacheableObject {
    * The item to the left of this relationship
    */
 
-  // TODO it's likely a circular dependency 😒 -> https://stackoverflow.com/questions/35240716/webpack-import-returns-undefined-depending-on-the-order-of-imports
+  @link(ITEM)
-  @link(Item)
   leftItem?: Observable<RemoteData<Item>>;
 
   /**
    * The item to the right of this relationship
    */
-  @link(Item)
+  @link(ITEM)
   rightItem?: Observable<RemoteData<Item>>;
 
   /**
@@ -65,7 +65,7 @@ export class Relationship implements CacheableObject {
   /**
    * The type of Relationship
    */
-  @link(RelationshipType)
+  @link(RelationshipType.type)
   relationshipType?: Observable<RemoteData<RelationshipType>>;
 
   _links: {

src/app/core/shared/item-resource-type.ts

@@ -0,0 +1,9 @@
+import { ResourceType } from "./resource-type";
+
+/**
+ * The resource type for Item.
+ *
+ * Needs to be in a separate file to prevent circular
+ * dependencies in webpack.
+ */
+export const ITEM = new ResourceType('item');

src/app/core/shared/item.model.ts

@@ -12,13 +12,14 @@ import { DSpaceObject } from './dspace-object.model';
 import { GenericConstructor } from './generic-constructor';
 import { HALLink } from './hal-link.model';
 import { Relationship } from './item-relationships/relationship.model';
-import { ResourceType } from './resource-type';
+import { ITEM } from "./item-resource-type";
+import { RELATIONSHIP } from "./relationship.resource-type";
 
 /**
  * Class representing a DSpace Item
  */
 export class Item extends DSpaceObject {
-  static type = new ResourceType('item');
+  static type = ITEM;
 
   /**
    * A string representing the unique handle of this Item
@@ -48,13 +49,13 @@ export class Item extends DSpaceObject {
   /**
    * The Collection that owns this Item
    */
-  @link(Collection)
+  @link(Collection.type)
   owningCollection: Observable<RemoteData<Collection>>;
 
-  @link(Bundle, true)
+  @link(Bundle.type, true)
   bundles: Observable<RemoteData<PaginatedList<Bundle>>>;
 
-  @link(Relationship, true)
+  @link(RELATIONSHIP)
   relationships: Observable<RemoteData<PaginatedList<Relationship>>>;
 
   _links: {

src/app/core/shared/relationship.resource-type.ts

@@ -0,0 +1,10 @@
+import { ResourceType } from "./resource-type";
+
+/**
+ * The resource type for Relationship.
+ *
+ * Needs to be in a separate file to prevent circular
+ * dependencies in webpack.
+ */
+export const RELATIONSHIP = new ResourceType('relationship');
+

src/app/core/submission/models/submission-object.model.ts

@@ -39,13 +39,13 @@ export abstract class SubmissionObject extends DSpaceObject implements Cacheable
   /**
    * The collection this submission applies to
    */
-  @link(Collection)
+  @link(Collection.type)
   collection?: Observable<RemoteData<Collection>> | Collection;
 
   /**
    * The submission item
    */
-  @link(Item)
+  @link(Item.type)
   item?: Observable<RemoteData<Item>> | Item;
 
   /**
@@ -56,13 +56,13 @@ export abstract class SubmissionObject extends DSpaceObject implements Cacheable
   /**
    * The configuration object that define this submission
    */
-  @link(SubmissionDefinitionsModel)
+  @link(SubmissionDefinitionsModel.type)
   submissionDefinition?: Observable<RemoteData<SubmissionDefinitionsModel>> | SubmissionDefinitionsModel;
 
   /**
    * The workspaceitem submitter
    */
-  @link(EPerson)
+  @link(EPerson.type)
   submitter?: Observable<RemoteData<EPerson>> | EPerson;
 
   /**

src/app/core/submission/workflowitem-data.service.ts

@@ -19,7 +19,7 @@ import { DSOChangeAnalyzer } from '../data/dso-change-analyzer.service';
  * A service that provides methods to make REST requests with workflowitems endpoint.
  */
 @Injectable()
-@dataService(WorkflowItem)
+@dataService(WorkflowItem.type)
 export class WorkflowItemDataService extends DataService<WorkflowItem> {
   protected linkPath = 'workflowitems';
   protected responseMsToLive = 10 * 1000;

src/app/core/submission/workspaceitem-data.service.ts

@@ -19,7 +19,7 @@ import { WorkspaceItem } from './models/workspaceitem.model';
  * A service that provides methods to make REST requests with workspaceitems endpoint.
  */
 @Injectable()
-@dataService(WorkspaceItem)
+@dataService(WorkspaceItem.type)
 export class WorkspaceitemDataService extends DataService<WorkspaceItem> {
   protected linkPath = 'workspaceitems';
   protected responseMsToLive = 10 * 1000;

src/app/core/tasks/claimed-task-data.service.ts

@@ -21,7 +21,7 @@ import { ProcessTaskResponse } from './models/process-task-response';
  * The service handling all REST requests for ClaimedTask
  */
 @Injectable()
-@dataService(ClaimedTask)
+@dataService(ClaimedTask.type)
 export class ClaimedTaskDataService extends TasksService<ClaimedTask> {
 
   protected responseMsToLive = 10 * 1000;

src/app/core/tasks/models/task-object.model.ts

@@ -34,19 +34,19 @@ export class TaskObject extends DSpaceObject implements CacheableObject {
   /**
    * The group of this task
    */
-  @link(EPerson)
+  @link(EPerson.type)
   eperson?: Observable<RemoteData<EPerson>>;
 
   /**
    * The group of this task
    */
-  @link(Group)
+  @link(Group.type)
   group?: Observable<RemoteData<Group>>;
 
   /**
    * The workflowitem object whom this task is related
    */
-  @link(WorkflowItem)
+  @link(WorkflowItem.type)
   workflowitem?: Observable<RemoteData<WorkflowItem>> | WorkflowItem;
 
   _links: {

src/app/core/tasks/pool-task-data.service.ts

@@ -21,7 +21,7 @@ import { ProcessTaskResponse } from './models/process-task-response';
  * The service handling all REST requests for PoolTask
  */
 @Injectable()
-@dataService(PoolTask)
+@dataService(PoolTask.type)
 export class PoolTaskDataService extends TasksService<PoolTask> {
 
   /**