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