feat(example): add examples of effects not based on the Actions stream (#1845)

As suggested, added two examples of effects not based on Actions stream:
- listen for router navigation events and update page title
- log out the user after a specified period of inactivity

Closes #1830

Author: Adrian Fâciu

projects/example-app/src/app/app-routing.module.ts

@@ -11,7 +11,11 @@ export const routes: Routes = [
     loadChildren: '@example-app/books/books.module#BooksModule',
     canActivate: [AuthGuard],
   },
-  { path: '**', component: NotFoundPageComponent },
+  {
+    path: '**',
+    component: NotFoundPageComponent,
+    data: { title: 'Not found' },
+  },
 ];
 
 @NgModule({

projects/example-app/src/app/app.module.ts

@@ -15,6 +15,7 @@ import { ROOT_REDUCERS, metaReducers } from '@example-app/reducers';
 
 import { CoreModule } from '@example-app/core';
 import { AppRoutingModule } from '@example-app/app-routing.module';
+import { UserEffects, RouterEffects } from '@example-app/core/effects';
 import { AppComponent } from '@example-app/core/containers';
 
 @NgModule({
@@ -73,7 +74,7 @@ import { AppComponent } from '@example-app/core/containers';
      *
      * See: https://ngrx.io/guide/effects#registering-root-effects
      */
-    EffectsModule.forRoot([]),
+    EffectsModule.forRoot([UserEffects, RouterEffects]),
     CoreModule,
   ],
   bootstrap: [AppComponent],

projects/example-app/src/app/auth/auth-routing.module.ts

@@ -2,7 +2,9 @@ import { NgModule } from '@angular/core';
 import { Routes, RouterModule } from '@angular/router';
 import { LoginPageComponent } from '@example-app/auth/containers';
 
-const routes: Routes = [{ path: 'login', component: LoginPageComponent }];
+const routes: Routes = [
+  { path: 'login', component: LoginPageComponent, data: { title: 'Login' } },
+];
 
 @NgModule({
   imports: [RouterModule.forChild(routes)],

projects/example-app/src/app/auth/effects/auth.effects.ts

@@ -12,6 +12,7 @@ import {
 import { Credentials } from '@example-app/auth/models';
 import { AuthService } from '@example-app/auth/services';
 import { LogoutConfirmationDialogComponent } from '@example-app/auth/components';
+import { UserActions } from '@example-app/core/actions';
 
 @Injectable()
 export class AuthEffects {
@@ -69,6 +70,13 @@ export class AuthEffects {
     )
   );
 
+  logoutIdleUser$ = createEffect(() =>
+    this.actions$.pipe(
+      ofType(UserActions.idleTimeout),
+      map(() => AuthActions.logout())
+    )
+  );
+
   constructor(
     private actions$: Actions,
     private authService: AuthService,

projects/example-app/src/app/books/books-routing.module.ts

@@ -9,13 +9,22 @@ import {
 import { BookExistsGuard } from '@example-app/books/guards';
 
 export const routes: Routes = [
-  { path: 'find', component: FindBookPageComponent },
+  {
+    path: 'find',
+    component: FindBookPageComponent,
+    data: { title: 'Find book' },
+  },
   {
     path: ':id',
     component: ViewBookPageComponent,
     canActivate: [BookExistsGuard],
+    data: { title: 'Book details' },
+  },
+  {
+    path: '',
+    component: CollectionPageComponent,
+    data: { title: 'Collection' },
   },
-  { path: '', component: CollectionPageComponent },
 ];
 
 @NgModule({

projects/example-app/src/app/core/actions/index.ts

@@ -1,3 +1,4 @@
 import * as LayoutActions from './layout.actions';
+import * as UserActions from './user.actions';
 
-export { LayoutActions };
+export { LayoutActions, UserActions };

projects/example-app/src/app/core/actions/user.actions.ts

@@ -0,0 +1,3 @@
+import { createAction } from '@ngrx/store';
+
+export const idleTimeout = createAction('[User] Idle Timeout');

projects/example-app/src/app/core/effects/index.ts

@@ -0,0 +1,2 @@
+export * from './user.effects';
+export * from './router.effects';

projects/example-app/src/app/core/effects/router.effects.spec.ts

@@ -0,0 +1,41 @@
+import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
+import { Title } from '@angular/platform-browser';
+import { TestBed } from '@angular/core/testing';
+
+import { of } from 'rxjs';
+
+import { RouterEffects } from '@example-app/core/effects';
+
+describe('RouterEffects', () => {
+  let effects: RouterEffects;
+  let titleService: Title;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [
+        RouterEffects,
+        {
+          provide: Router,
+          useValue: { events: of(new NavigationEnd(1, '', '')) },
+        },
+        {
+          provide: ActivatedRoute,
+          useValue: { data: of({ title: 'Search' }) },
+        },
+        { provide: Title, useValue: { setTitle: jest.fn() } },
+      ],
+    });
+
+    effects = TestBed.get(RouterEffects);
+    titleService = TestBed.get(Title);
+  });
+
+  describe('updateTitle$', () => {
+    it('should update the title on router navigation', () => {
+      effects.updateTitle$.subscribe();
+      expect(titleService.setTitle).toHaveBeenCalledWith(
+        'Book Collection - Search'
+      );
+    });
+  });
+});

projects/example-app/src/app/core/effects/router.effects.ts

@@ -0,0 +1,34 @@
+import { Injectable } from '@angular/core';
+import { Router, NavigationEnd, ActivatedRoute } from '@angular/router';
+import { Title } from '@angular/platform-browser';
+
+import { tap, filter, map, mergeMap } from 'rxjs/operators';
+
+import { createEffect } from '@ngrx/effects';
+
+@Injectable()
+export class RouterEffects {
+  updateTitle$ = createEffect(
+    () =>
+      this.router.events.pipe(
+        filter(event => event instanceof NavigationEnd),
+        map(() => {
+          let route = this.activatedRoute;
+          while (route.firstChild) route = route.firstChild;
+          return route;
+        }),
+        mergeMap(route => route.data),
+        map(data => `Book Collection - ${data['title']}`),
+        tap(title => this.titleService.setTitle(title))
+      ),
+    {
+      dispatch: false,
+    }
+  );
+
+  constructor(
+    private router: Router,
+    private titleService: Title,
+    private activatedRoute: ActivatedRoute
+  ) {}
+}