| import { Observable } from '../Observable'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| import { OuterSubscriber } from '../OuterSubscriber'; |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @extends {Ignored} |
| * @hide true |
| */ |
| export class UsingObservable extends Observable { |
| constructor(resourceFactory, observableFactory) { |
| super(); |
| this.resourceFactory = resourceFactory; |
| this.observableFactory = observableFactory; |
| } |
| static create(resourceFactory, observableFactory) { |
| return new UsingObservable(resourceFactory, observableFactory); |
| } |
| _subscribe(subscriber) { |
| const { resourceFactory, observableFactory } = this; |
| let resource; |
| try { |
| resource = resourceFactory(); |
| return new UsingSubscriber(subscriber, resource, observableFactory); |
| } |
| catch (err) { |
| subscriber.error(err); |
| } |
| } |
| } |
| class UsingSubscriber extends OuterSubscriber { |
| constructor(destination, resource, observableFactory) { |
| super(destination); |
| this.resource = resource; |
| this.observableFactory = observableFactory; |
| destination.add(resource); |
| this.tryUse(); |
| } |
| tryUse() { |
| try { |
| const source = this.observableFactory.call(this, this.resource); |
| if (source) { |
| this.add(subscribeToResult(this, source)); |
| } |
| } |
| catch (err) { |
| this._error(err); |
| } |
| } |
| } |
| //# sourceMappingURL=UsingObservable.js.map |