64 lines
No EOL
2 KiB
JavaScript
64 lines
No EOL
2 KiB
JavaScript
import { isArray } from '../util/isArray';
|
|
import { fromArray } from './fromArray';
|
|
import { OuterSubscriber } from '../OuterSubscriber';
|
|
import { subscribeToResult } from '../util/subscribeToResult';
|
|
export function race(...observables) {
|
|
if (observables.length === 1) {
|
|
if (isArray(observables[0])) {
|
|
observables = observables[0];
|
|
}
|
|
else {
|
|
return observables[0];
|
|
}
|
|
}
|
|
return fromArray(observables, undefined).lift(new RaceOperator());
|
|
}
|
|
export class RaceOperator {
|
|
call(subscriber, source) {
|
|
return source.subscribe(new RaceSubscriber(subscriber));
|
|
}
|
|
}
|
|
export class RaceSubscriber extends OuterSubscriber {
|
|
constructor(destination) {
|
|
super(destination);
|
|
this.hasFirst = false;
|
|
this.observables = [];
|
|
this.subscriptions = [];
|
|
}
|
|
_next(observable) {
|
|
this.observables.push(observable);
|
|
}
|
|
_complete() {
|
|
const observables = this.observables;
|
|
const len = observables.length;
|
|
if (len === 0) {
|
|
this.destination.complete();
|
|
}
|
|
else {
|
|
for (let i = 0; i < len && !this.hasFirst; i++) {
|
|
const observable = observables[i];
|
|
const subscription = subscribeToResult(this, observable, undefined, i);
|
|
if (this.subscriptions) {
|
|
this.subscriptions.push(subscription);
|
|
}
|
|
this.add(subscription);
|
|
}
|
|
this.observables = null;
|
|
}
|
|
}
|
|
notifyNext(_outerValue, innerValue, outerIndex) {
|
|
if (!this.hasFirst) {
|
|
this.hasFirst = true;
|
|
for (let i = 0; i < this.subscriptions.length; i++) {
|
|
if (i !== outerIndex) {
|
|
let subscription = this.subscriptions[i];
|
|
subscription.unsubscribe();
|
|
this.remove(subscription);
|
|
}
|
|
}
|
|
this.subscriptions = null;
|
|
}
|
|
this.destination.next(innerValue);
|
|
}
|
|
}
|
|
//# sourceMappingURL=race.js.map
|