71380: Remove redundant code and add subscribable removeByHrefSubstring

src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts

@@ -198,8 +198,11 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
         this.bundleService.patch(bundle, [moveOperation]).pipe(take(1)).subscribe((response: RestResponse) => {
           this.zone.run(() => {
             this.displayNotifications('item.edit.bitstreams.notifications.move', [response]);
-            this.requestService.removeByHrefSubstring(bundle.self);
+            // Remove all cached requests from this bundle and call the event's callback when the requests are cleared
-            event.finish();
+            this.requestService.removeByHrefSubstring(bundle.self).pipe(
+              filter((isCached) => isCached),
+              take(1)
+            ).subscribe(() => event.finish());
           });
         });
       }

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

@@ -201,8 +201,9 @@ export class RequestService {
    * Remove all request cache providing (part of) the href
    * This also includes href-to-uuid index cache
    * @param href    A substring of the request(s) href
+   * @return        Returns an observable emitting whether or not the cache is removed
    */
-  removeByHrefSubstring(href: string) {
+  removeByHrefSubstring(href: string): Observable<boolean> {
     this.store.pipe(
       select(uuidsFromHrefSubstringSelector(requestIndexSelector, href)),
       take(1)
@@ -213,6 +214,11 @@ export class RequestService {
     });
     this.requestsOnTheirWayToTheStore = this.requestsOnTheirWayToTheStore.filter((reqHref: string) => reqHref.indexOf(href) < 0);
     this.indexStore.dispatch(new RemoveFromIndexBySubstringAction(IndexName.REQUEST, href));
+
+    return this.store.pipe(
+      select(uuidsFromHrefSubstringSelector(requestIndexSelector, href)),
+      map((uuids) => isEmpty(uuids))
+    );
   }
 
   /**

src/app/shared/mocks/request.service.mock.ts

@@ -11,7 +11,7 @@ export function getMockRequestService(requestEntry$: Observable<RequestEntry> =
     getByUUID: requestEntry$,
     uriEncodeBody: jasmine.createSpy('uriEncodeBody'),
     isCachedOrPending: false,
-    removeByHrefSubstring: jasmine.createSpy('removeByHrefSubstring'),
+    removeByHrefSubstring: jasmine.createSpy('removeByHrefSubstring').and.returnValue(observableOf(true)),
     hasByHrefObservable: observableOf(false)
   });
 }

src/app/shared/pagination-drag-and-drop/abstract-paginated-drag-and-drop-list.component.ts

@@ -75,7 +75,7 @@ export abstract class AbstractPaginatedDragAndDropListComponent<T extends DSpace
   /**
    * The amount of objects to display per page
    */
-  pageSize = 10;
+  pageSize = 2;
 
   /**
    * The page options to use for fetching the objects
@@ -100,14 +100,6 @@ export abstract class AbstractPaginatedDragAndDropListComponent<T extends DSpace
    */
   loading$: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);
 
-  /**
-   * ID of the object the page's first element needs to match in order to stop the loading animation.
-   * This is to ensure the new page is fully loaded containing the latest data from the REST API whenever an object is
-   * dropped on a new page. This allows the component to expect the dropped object to be present on top of the new page,
-   * while displaying a loading animation until this is the case.
-   */
-  stopLoadingWhenFirstIs: string;
-
   /**
    * List of subscriptions
    */
@@ -157,12 +149,8 @@ export abstract class AbstractPaginatedDragAndDropListComponent<T extends DSpace
         distinctUntilChanged(compareArraysUsingFieldUuids())
       ).subscribe((updateValues) => {
         this.customOrder = updateValues.map((fieldUpdate) => fieldUpdate.field.uuid);
-        // Check if stopLoadingWhenFirstIs contains a value. If it does and it equals the first value in customOrder, stop the loading animation.
+        // We received new values, stop displaying a loading indicator if it's present
-        // This is to ensure the page is updated to contain the new values first, before displaying it.
-        if (hasValue(this.stopLoadingWhenFirstIs) && isNotEmpty(this.customOrder) && this.customOrder[0] === this.stopLoadingWhenFirstIs) {
-          this.stopLoadingWhenFirstIs = undefined;
         this.loading$.next(false);
-        }
       }),
       // Disable the pagination when objects are loading
       this.loading$.subscribe((loading) => this.options.disabled = loading)
@@ -214,9 +202,6 @@ export abstract class AbstractPaginatedDragAndDropListComponent<T extends DSpace
     // Send out a drop event (and navigate to the new page) when the "from" and "to" indexes are different from each other
     if (fromIndex !== toIndex) {
       if (isNewPage) {
-        this.stopLoadingWhenFirstIs = this.customOrder[dragIndex];
-        this.customOrder = [];
-        this.paginationComponent.doPageChange(redirectPage);
         this.loading$.next(true);
       }
       this.dropObject.emit(Object.assign({
@@ -224,7 +209,7 @@ export abstract class AbstractPaginatedDragAndDropListComponent<T extends DSpace
         toIndex,
         finish: () => {
           if (isNewPage) {
-            this.currentPage$.next(redirectPage);
+            this.paginationComponent.doPageChange(redirectPage);
           }
         }
       }));