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