71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
import { isArray } from '../util/isArray';
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import { ArrayObservable } from '../observable/ArrayObservable';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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export function race(...observables) {
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// if the only argument is an array, it was most likely called with
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// `race([obs1, obs2, ...])`
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if (observables.length === 1) {
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if (isArray(observables[0])) {
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observables = observables[0];
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}
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else {
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return observables[0];
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}
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}
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return new ArrayObservable(observables).lift(new RaceOperator());
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}
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export class RaceOperator {
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call(subscriber, source) {
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return source.subscribe(new RaceSubscriber(subscriber));
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}
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export class RaceSubscriber extends OuterSubscriber {
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constructor(destination) {
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super(destination);
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this.hasFirst = false;
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this.observables = [];
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this.subscriptions = [];
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}
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_next(observable) {
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this.observables.push(observable);
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}
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_complete() {
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const observables = this.observables;
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const len = observables.length;
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if (len === 0) {
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this.destination.complete();
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}
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else {
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for (let i = 0; i < len && !this.hasFirst; i++) {
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let observable = observables[i];
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let subscription = subscribeToResult(this, observable, observable, i);
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if (this.subscriptions) {
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this.subscriptions.push(subscription);
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}
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this.add(subscription);
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}
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this.observables = null;
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}
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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if (!this.hasFirst) {
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this.hasFirst = true;
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for (let i = 0; i < this.subscriptions.length; i++) {
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if (i !== outerIndex) {
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let subscription = this.subscriptions[i];
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subscription.unsubscribe();
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this.remove(subscription);
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}
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}
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this.subscriptions = null;
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}
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this.destination.next(innerValue);
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}
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}
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//# sourceMappingURL=race.js.map
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