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Contents
import { Observable, SubscribableOrPromise } from '../Observable';
import { Subscriber } from '../Subscriber';
import { AnonymousSubscription, TeardownLogic } from '../Subscription';
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class UsingObservable<T> extends Observable<T> {
static create<T>(resourceFactory: () => AnonymousSubscription | void,
observableFactory: (resource: AnonymousSubscription) => SubscribableOrPromise<T> | void): Observable<T> {
return new UsingObservable<T>(resourceFactory, observableFactory);
}
constructor(private resourceFactory: () => AnonymousSubscription | void,
private observableFactory: (resource: AnonymousSubscription) => SubscribableOrPromise<T> | void) {
super();
}
/** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>): TeardownLogic {
const { resourceFactory, observableFactory } = this;
let resource: AnonymousSubscription;
try {
resource = <AnonymousSubscription>resourceFactory();
return new UsingSubscriber(subscriber, resource, observableFactory);
} catch (err) {
subscriber.error(err);
}
}
}
class UsingSubscriber<T> extends OuterSubscriber<T, T> {
constructor(destination: Subscriber<T>,
private resource: AnonymousSubscription,
private observableFactory: (resource: AnonymousSubscription) => SubscribableOrPromise<T> | void) {
super(destination);
destination.add(resource);
this.tryUse();
}
private tryUse(): void {
try {
const source = this.observableFactory.call(this, this.resource);
if (source) {
this.add(subscribeToResult(this, source));
}
} catch (err) {
this._error(err);
}
}
}
Version data entries
49 entries across 49 versions & 4 rubygems