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refactor(async_pipe): use subscription strategy interface 

The strategies for Promise and Observable based subscriptions
have (nearly) the same method signatures. They should implement
a common interface.

Closes #7573
This commit is contained in:
Tom Schoener 2016-03-12 14:22:31 +01:00 committed by Misko Hevery
parent ceac045a7f
commit adc135e6c8
1 changed files with 9 additions and 3 deletions
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12
modules/@angular/common/src/pipes/async_pipe.ts
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@ -5,7 +5,13 @@ import {ObservableWrapper, Observable, EventEmitter} from '../../src/facade/asyn
import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
class ObservableStrategy {
interface SubscriptionStrategy {
createSubscription(async: any, updateLatestValue: any, onError?: (v: any) => any): any;
dispose(subscription: any): void;
onDestroy(subscription: any): void;
}
class ObservableStrategy implements SubscriptionStrategy {
createSubscription(async: any, updateLatestValue: any,
onError: (v: any) => any = e => { throw e; }): any {
return ObservableWrapper.subscribe(async, updateLatestValue, onError);
@ -16,7 +22,7 @@ class ObservableStrategy {
onDestroy(subscription: any): void { ObservableWrapper.dispose(subscription); }
}
class PromiseStrategy {
class PromiseStrategy implements SubscriptionStrategy {
createSubscription(async: Promise<any>, updateLatestValue: (v: any) => any,
onError: (v: any) => any = e => { throw e; }): any {
return async.then(updateLatestValue, onError);
@ -61,7 +67,7 @@ export class AsyncPipe implements OnDestroy {
_subscription: Object = null;
/** @internal */
_obj: Observable<any>| Promise<any>| EventEmitter<any> = null;
private _strategy: any = null;
private _strategy: SubscriptionStrategy = null;
/** @internal */
public _ref: ChangeDetectorRef;
constructor(_ref: ChangeDetectorRef) { this._ref = _ref; }