50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
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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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