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