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feat(retryWhen): add higher-order lettable version of retryWhen
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| import { Operator } from '../Operator'; | ||
| import { Subscriber } from '../Subscriber'; | ||
| import { Observable } from '../Observable'; | ||
| import { Subject } from '../Subject'; | ||
| import { Subscription, TeardownLogic } from '../Subscription'; | ||
| import { tryCatch } from '../util/tryCatch'; | ||
| import { errorObject } from '../util/errorObject'; | ||
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| import { OuterSubscriber } from '../OuterSubscriber'; | ||
| import { InnerSubscriber } from '../InnerSubscriber'; | ||
| import { subscribeToResult } from '../util/subscribeToResult'; | ||
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| import { MonoTypeOperatorFunction } from '../interfaces'; | ||
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| /** | ||
| * Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable | ||
| * calls `error`, this method will emit the Throwable that caused the error 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/retryWhen.png" width="100%"> | ||
| * | ||
| * @param {function(errors: Observable): Observable} notifier - Receives an Observable of notifications with which a | ||
| * user can `complete` or `error`, aborting the retry. | ||
| * @return {Observable} The source Observable modified with retry logic. | ||
| * @method retryWhen | ||
| * @owner Observable | ||
| */ | ||
| export function retryWhen<T>(notifier: (errors: Observable<any>) => Observable<any>): MonoTypeOperatorFunction<T> { | ||
| return (source: Observable<T>) => source.lift(new RetryWhenOperator(notifier, source)); | ||
| } | ||
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| class RetryWhenOperator<T> implements Operator<T, T> { | ||
| constructor(protected notifier: (errors: Observable<any>) => Observable<any>, | ||
| protected source: Observable<T>) { | ||
| } | ||
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| call(subscriber: Subscriber<T>, source: any): TeardownLogic { | ||
| return source.subscribe(new RetryWhenSubscriber(subscriber, this.notifier, this.source)); | ||
| } | ||
| } | ||
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| /** | ||
| * We need this JSDoc comment for affecting ESDoc. | ||
| * @ignore | ||
| * @extends {Ignored} | ||
| */ | ||
| class RetryWhenSubscriber<T, R> extends OuterSubscriber<T, R> { | ||
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| private errors: Subject<any>; | ||
| private retries: Observable<any>; | ||
| private retriesSubscription: Subscription; | ||
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| constructor(destination: Subscriber<R>, | ||
| private notifier: (errors: Observable<any>) => Observable<any>, | ||
| private source: Observable<T>) { | ||
| super(destination); | ||
| } | ||
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| error(err: any) { | ||
| if (!this.isStopped) { | ||
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| let errors = this.errors; | ||
| let retries: any = this.retries; | ||
| let retriesSubscription = this.retriesSubscription; | ||
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| if (!retries) { | ||
| errors = new Subject(); | ||
| retries = tryCatch(this.notifier)(errors); | ||
| if (retries === errorObject) { | ||
| return super.error(errorObject.e); | ||
| } | ||
| retriesSubscription = subscribeToResult(this, retries); | ||
| } else { | ||
| this.errors = null; | ||
| this.retriesSubscription = null; | ||
| } | ||
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| this._unsubscribeAndRecycle(); | ||
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| this.errors = errors; | ||
| this.retries = retries; | ||
| this.retriesSubscription = retriesSubscription; | ||
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| errors.next(err); | ||
| } | ||
| } | ||
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| protected _unsubscribe() { | ||
| const { errors, retriesSubscription } = this; | ||
| if (errors) { | ||
| errors.unsubscribe(); | ||
| this.errors = null; | ||
| } | ||
| if (retriesSubscription) { | ||
| retriesSubscription.unsubscribe(); | ||
| this.retriesSubscription = null; | ||
| } | ||
| this.retries = null; | ||
| } | ||
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| notifyNext(outerValue: T, innerValue: R, | ||
| outerIndex: number, innerIndex: number, | ||
| innerSub: InnerSubscriber<T, R>): void { | ||
| const { errors, retries, retriesSubscription } = this; | ||
| this.errors = null; | ||
| this.retries = null; | ||
| this.retriesSubscription = null; | ||
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| this._unsubscribeAndRecycle(); | ||
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| this.errors = errors; | ||
| this.retries = retries; | ||
| this.retriesSubscription = retriesSubscription; | ||
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| this.source.subscribe(this); | ||
| } | ||
| } |