feat(core): PlatformRef and ApplicationRef support registration of disposal functions.

These functions will be called whenever the platform or application are being disposed.

modules/angular2/src/core/application_ref.ts

@@ -150,6 +150,11 @@ export function platformCommon(bindings?: Array<Type | Provider | any[]>, initia
  * explicitly by calling {@link platform}().
  */
 export abstract class PlatformRef {
+  /**
+   * Register a listener to be called when the platform is disposed.
+   */
+  abstract registerDisposeListener(dispose: () => void): void;
+
   /**
    * Retrieve the platform {@link Injector}, which is the parent injector for
    * every Angular application on the page and provides singleton providers.
@@ -210,9 +215,12 @@ export abstract class PlatformRef {
 export class PlatformRef_ extends PlatformRef {
   /** @internal */
   _applications: ApplicationRef[] = [];
+  _disposeListeners: Function[] = [];
 
   constructor(private _injector: Injector, private _dispose: () => void) { super(); }
 
+  registerDisposeListener(dispose: () => void): void { this._disposeListeners.push(dispose); }
+
   get injector(): Injector { return this._injector; }
 
   application(bindings: Array<Type | Provider | any[]>): ApplicationRef {
@@ -259,6 +267,7 @@ export class PlatformRef_ extends PlatformRef {
 
   dispose(): void {
     this._applications.forEach((app) => app.dispose());
+    this._disposeListeners.forEach((dispose) => dispose());
     this._dispose();
   }
 
@@ -278,6 +287,11 @@ export abstract class ApplicationRef {
    */
   abstract registerBootstrapListener(listener: (ref: ComponentRef) => void): void;
 
+  /**
+   * Register a listener to be called when the application is disposed.
+   */
+  abstract registerDisposeListener(dispose: () => void): void;
+
   /**
    * Bootstrap a new component at the root level of the application.
    *
@@ -326,6 +340,7 @@ export abstract class ApplicationRef {
 
 export class ApplicationRef_ extends ApplicationRef {
   private _bootstrapListeners: Function[] = [];
+  private _disposeListeners: Function[] = [];
   private _rootComponents: ComponentRef[] = [];
   private _rootComponentTypes: Type[] = [];
 
@@ -337,6 +352,8 @@ export class ApplicationRef_ extends ApplicationRef {
     this._bootstrapListeners.push(listener);
   }
 
+  registerDisposeListener(dispose: () => void): void { this._disposeListeners.push(dispose); }
+
   bootstrap(componentType: Type,
             providers?: Array<Type | Provider | any[]>): Promise<ComponentRef> {
     var completer = PromiseWrapper.completer();
@@ -380,6 +397,7 @@ export class ApplicationRef_ extends ApplicationRef {
   dispose(): void {
     // TODO(alxhub): Dispose of the NgZone.
     this._rootComponents.forEach((ref) => ref.dispose());
+    this._disposeListeners.forEach((dispose) => dispose());
     this._platform._applicationDisposed(this);
   }
 

modules/angular2/src/mock/mock_application_ref.ts

@@ -0,0 +1,24 @@
+import {ApplicationRef} from 'angular2/src/core/application_ref';
+import {Type} from 'angular2/src/core/facade/lang';
+import {ComponentRef} from 'angular2/src/core/linker/dynamic_component_loader';
+import {Provider, Injector} from 'angular2/src/core/di';
+import {NgZone} from 'angular2/src/core/zone/ng_zone';
+import {Promise} from 'angular2/src/core/facade/async';
+
+export class MockApplicationRef extends ApplicationRef {
+  registerBootstrapListener(listener: (ref: ComponentRef) => void): void {}
+
+  registerDisposeListener(dispose: () => void): void {}
+
+  bootstrap(componentType: Type, bindings?: Array<Type | Provider | any[]>): Promise<ComponentRef> {
+    return null;
+  }
+
+  get injector(): Injector { return null; };
+
+  get zone(): NgZone { return null; };
+
+  dispose(): void {}
+
+  get componentTypes(): Type[] { return null; };
+}

modules/angular2/test/public_api_spec.ts

@@ -98,6 +98,7 @@ var NG_API = [
   'ApplicationRef.bootstrap()',
   'ApplicationRef.dispose()',
   'ApplicationRef.registerBootstrapListener()',
+  'ApplicationRef.registerDisposeListener()',
   */
   'AsyncPipe',
   'AsyncPipe.onDestroy()',
@@ -873,6 +874,7 @@ var NG_API = [
   'PlatformRef.application()',
   'PlatformRef.asyncApplication()',
   'PlatformRef.dispose()',
+  'PlatformRef.registerDisposeListener()',
   */
   'PlatformRef.injector',
   'Predicate:dart',