Merge pull request #2404 from alexandrevryghem/fix-setStaleByHrefSubt…

…ring-not-emitting-after-all-requests-were-stale_contribute-maintenance-7.6

[Port dspace-7_x] Fix `setStaleByHrefSubstring` not emitting true when all requests are stale

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

@@ -1,6 +1,6 @@
 import { Store, StoreModule } from '@ngrx/store';
 import { cold, getTestScheduler } from 'jasmine-marbles';
-import { EMPTY, of as observableOf } from 'rxjs';
+import { EMPTY, Observable, of as observableOf } from 'rxjs';
 import { TestScheduler } from 'rxjs/testing';
 
 import { getMockObjectCacheService } from '../../shared/mocks/object-cache.service.mock';
@@ -638,4 +638,48 @@ describe('RequestService', () => {
       expect(done$).toBeObservable(cold('-----(t|)', { t: true }));
     }));
   });
+
+  describe('setStaleByHrefSubstring', () => {
+    let dispatchSpy: jasmine.Spy;
+    let getByUUIDSpy: jasmine.Spy;
+
+    beforeEach(() => {
+      dispatchSpy = spyOn(store, 'dispatch');
+      getByUUIDSpy = spyOn(service, 'getByUUID').and.callThrough();
+    });
+
+    describe('with an empty/no matching requests in the state', () => {
+      it('should return true', () => {
+        const done$: Observable<boolean> = service.setStaleByHrefSubstring('https://rest.api/endpoint/selfLink');
+        expect(done$).toBeObservable(cold('(a|)', { a: true }));
+      });
+    });
+
+    describe('with a matching request in the state', () => {
+      beforeEach(() => {
+        const state = Object.assign({}, initialState, {
+          core: Object.assign({}, initialState.core, {
+            'index': {
+              'get-request/href-to-uuid': {
+                'https://rest.api/endpoint/selfLink': '5f2a0d2a-effa-4d54-bd54-5663b960f9eb'
+              }
+            }
+          })
+        });
+        mockStore.setState(state);
+      });
+
+      it('should return an Observable that emits true as soon as the request is stale', () => {
+        dispatchSpy.and.callFake(() => { /* empty */ });   // don't actually set as stale
+        getByUUIDSpy.and.returnValue(cold('a-b--c--d-', {  // but fake the state in the cache
+          a: { state: RequestEntryState.ResponsePending },
+          b: { state: RequestEntryState.Success },
+          c: { state: RequestEntryState.SuccessStale },
+          d: { state: RequestEntryState.Error },
+        }));
+        const done$: Observable<boolean> = service.setStaleByHrefSubstring('https://rest.api/endpoint/selfLink');
+        expect(done$).toBeObservable(cold('-----(a|)', { a: true }));
+      });
+    });
+  });
 });

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

@@ -2,8 +2,8 @@ import { Injectable } from '@angular/core';
 import { HttpHeaders } from '@angular/common/http';
 
 import { createSelector, MemoizedSelector, select, Store } from '@ngrx/store';
-import { Observable } from 'rxjs';
-import { filter, map, take, tap } from 'rxjs/operators';
+import { Observable, from as observableFrom } from 'rxjs';
+import { filter, find, map, mergeMap, switchMap, take, tap, toArray } from 'rxjs/operators';
 import cloneDeep from 'lodash/cloneDeep';
 import { hasValue, isEmpty, isNotEmpty, hasNoValue } from '../../shared/empty.util';
 import { ObjectCacheEntry } from '../cache/object-cache.reducer';
@@ -300,22 +300,42 @@ export class RequestService {
    * Set all requests that match (part of) the href to stale
    *
    * @param href    A substring of the request(s) href
-   * @return        Returns an observable emitting whether or not the cache is removed
+   * @return        Returns an observable emitting when those requests are all stale
    */
   setStaleByHrefSubstring(href: string): Observable<boolean> {
-    this.store.pipe(
+    const requestUUIDs$ = this.store.pipe(
       select(uuidsFromHrefSubstringSelector(requestIndexSelector, href)),
       take(1)
-    ).subscribe((uuids: string[]) => {
+    );
+    requestUUIDs$.subscribe((uuids: string[]) => {
       for (const uuid of uuids) {
         this.store.dispatch(new RequestStaleAction(uuid));
       }
     });
     this.requestsOnTheirWayToTheStore = this.requestsOnTheirWayToTheStore.filter((reqHref: string) => reqHref.indexOf(href) < 0);
 
-    return this.store.pipe(
-      select(uuidsFromHrefSubstringSelector(requestIndexSelector, href)),
-      map((uuids) => isEmpty(uuids))
+    // emit true after all requests are stale
+    return requestUUIDs$.pipe(
+      switchMap((uuids: string[]) => {
+        if (isEmpty(uuids)) {
+          // if there were no matching requests, emit true immediately
+          return [true];
+        } else {
+          // otherwise emit all request uuids in order
+          return observableFrom(uuids).pipe(
+            // retrieve the RequestEntry for each uuid
+            mergeMap((uuid: string) => this.getByUUID(uuid)),
+            // check whether it is undefined or stale
+            map((request: RequestEntry) => hasNoValue(request) || isStale(request.state)),
+            // if it is, complete
+            find((stale: boolean) => stale === true),
+            // after all observables above are completed, emit them as a single array
+            toArray(),
+            // when the array comes in, emit true
+            map(() => true)
+          );
+        }
+      })
     );
   }