110 lines
3.4 KiB
Plaintext
110 lines
3.4 KiB
Plaintext
import { Operator } from '../Operator';
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import { Subscriber } from '../Subscriber';
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import { Observable } from '../Observable';
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import { Subject } from '../Subject';
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import { Subscription } from '../Subscription';
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import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
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import { SimpleOuterSubscriber, innerSubscribe, SimpleInnerSubscriber } from '../innerSubscribe';
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/**
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* Returns an Observable that mirrors the source Observable with the exception of an `error`. If the source Observable
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* calls `error`, this method will emit the Throwable that caused the error to the Observable returned from `notifier`.
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* If that Observable calls `complete` or `error` then this method will call `complete` or `error` on the child
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* subscription. Otherwise this method will resubscribe to the source Observable.
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*
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* 
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*
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* @param {function(errors: Observable): Observable} notifier - Receives an Observable of notifications with which a
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* user can `complete` or `error`, aborting the retry.
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* @return {Observable} The source Observable modified with retry logic.
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* @method retryWhen
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* @owner Observable
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*/
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export function retryWhen<T>(notifier: (errors: Observable<any>) => Observable<any>): MonoTypeOperatorFunction<T> {
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return (source: Observable<T>) => source.lift(new RetryWhenOperator(notifier, source));
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}
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class RetryWhenOperator<T> implements Operator<T, T> {
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constructor(protected notifier: (errors: Observable<any>) => Observable<any>,
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protected source: Observable<T>) {
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}
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call(subscriber: Subscriber<T>, source: any): TeardownLogic {
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return source.subscribe(new RetryWhenSubscriber(subscriber, this.notifier, this.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 RetryWhenSubscriber<T, R> extends SimpleOuterSubscriber<T, R> {
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private errors?: Subject<any>;
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private retries?: Observable<any>;
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private retriesSubscription?: Subscription;
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constructor(destination: Subscriber<R>,
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private notifier: (errors: Observable<any>) => Observable<any>,
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private source: Observable<T>) {
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super(destination);
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}
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error(err: any) {
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if (!this.isStopped) {
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let errors = this.errors;
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let retries: any = this.retries;
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let retriesSubscription = this.retriesSubscription;
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if (!retries) {
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errors = new Subject();
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try {
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const { notifier } = this;
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retries = notifier(errors);
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} catch (e) {
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return super.error(e);
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}
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retriesSubscription = innerSubscribe(retries, new SimpleInnerSubscriber(this));
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} else {
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this.errors = undefined;
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this.retriesSubscription = undefined;
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}
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this._unsubscribeAndRecycle();
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this.errors = errors;
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this.retries = retries;
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this.retriesSubscription = retriesSubscription;
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errors!.next(err);
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}
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}
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/** @deprecated This is an internal implementation detail, do not use. */
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_unsubscribe() {
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const { errors, retriesSubscription } = this;
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if (errors) {
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errors.unsubscribe();
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this.errors = undefined;
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}
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if (retriesSubscription) {
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retriesSubscription.unsubscribe();
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this.retriesSubscription = undefined;
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}
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this.retries = undefined;
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}
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notifyNext(): void {
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const { _unsubscribe } = this;
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this._unsubscribe = null!;
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this._unsubscribeAndRecycle();
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this._unsubscribe = _unsubscribe;
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this.source.subscribe(this);
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}
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}
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