98 lines
3.6 KiB
JavaScript
98 lines
3.6 KiB
JavaScript
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import { Subject } from '../Subject';
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import { tryCatch } from '../util/tryCatch';
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import { errorObject } from '../util/errorObject';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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/**
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* Returns an Observable that mirrors the source Observable with the exception of a `complete`. If the source
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* Observable calls `complete`, this method will emit to the Observable returned from `notifier`. If that Observable
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* calls `complete` or `error`, then this method will call `complete` or `error` on the child subscription. Otherwise
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* this method will resubscribe to the source Observable.
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*
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* <img src="./img/repeatWhen.png" width="100%">
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*
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* @param {function(notifications: Observable): Observable} notifier - Receives an Observable of notifications with
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* which a user can `complete` or `error`, aborting the repetition.
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* @return {Observable} The source Observable modified with repeat logic.
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* @method repeatWhen
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* @owner Observable
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*/
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export function repeatWhen(notifier) {
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return (source) => source.lift(new RepeatWhenOperator(notifier));
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}
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class RepeatWhenOperator {
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constructor(notifier) {
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this.notifier = notifier;
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}
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call(subscriber, source) {
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return source.subscribe(new RepeatWhenSubscriber(subscriber, this.notifier, source));
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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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class RepeatWhenSubscriber extends OuterSubscriber {
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constructor(destination, notifier, source) {
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super(destination);
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this.notifier = notifier;
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this.source = source;
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this.sourceIsBeingSubscribedTo = true;
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.sourceIsBeingSubscribedTo = true;
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this.source.subscribe(this);
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}
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notifyComplete(innerSub) {
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if (this.sourceIsBeingSubscribedTo === false) {
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return super.complete();
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}
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}
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complete() {
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this.sourceIsBeingSubscribedTo = false;
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if (!this.isStopped) {
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if (!this.retries) {
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this.subscribeToRetries();
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}
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if (!this.retriesSubscription || this.retriesSubscription.closed) {
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return super.complete();
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}
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this._unsubscribeAndRecycle();
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this.notifications.next();
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}
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}
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/** @deprecated internal use only */ _unsubscribe() {
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const { notifications, retriesSubscription } = this;
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if (notifications) {
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notifications.unsubscribe();
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this.notifications = null;
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}
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if (retriesSubscription) {
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retriesSubscription.unsubscribe();
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this.retriesSubscription = null;
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}
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this.retries = null;
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}
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/** @deprecated internal use only */ _unsubscribeAndRecycle() {
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const { notifications, retries, retriesSubscription } = this;
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this.notifications = null;
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this.retries = null;
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this.retriesSubscription = null;
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super._unsubscribeAndRecycle();
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this.notifications = notifications;
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this.retries = retries;
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this.retriesSubscription = retriesSubscription;
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return this;
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}
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subscribeToRetries() {
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this.notifications = new Subject();
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const retries = tryCatch(this.notifier)(this.notifications);
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if (retries === errorObject) {
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return super.complete();
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}
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this.retries = retries;
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this.retriesSubscription = subscribeToResult(this, retries);
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}
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}
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//# sourceMappingURL=repeatWhen.js.map
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