work.suroh.tk/node_modules/rxjs/_esm2015/operators/repeatWhen.js

98 lines
3.6 KiB
JavaScript

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