54 lines
1.9 KiB
JavaScript
54 lines
1.9 KiB
JavaScript
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import { Subscriber } from '../Subscriber';
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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 resubscribe to the source Observable for a maximum of `count` resubscriptions (given
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* as a number parameter) rather than propagating the `error` call.
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*
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* <img src="./img/retry.png" width="100%">
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*
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* Any and all items emitted by the source Observable will be emitted by the resulting Observable, even those emitted
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* during failed subscriptions. For example, if an Observable fails at first but emits [1, 2] then succeeds the second
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* time and emits: [1, 2, 3, 4, 5] then the complete stream of emissions and notifications
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* would be: [1, 2, 1, 2, 3, 4, 5, `complete`].
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* @param {number} count - Number of retry attempts before failing.
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* @return {Observable} The source Observable modified with the retry logic.
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* @method retry
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* @owner Observable
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*/
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export function retry(count = -1) {
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return (source) => source.lift(new RetryOperator(count, source));
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}
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class RetryOperator {
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constructor(count, source) {
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this.count = count;
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this.source = source;
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}
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call(subscriber, source) {
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return source.subscribe(new RetrySubscriber(subscriber, this.count, 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 RetrySubscriber extends Subscriber {
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constructor(destination, count, source) {
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super(destination);
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this.count = count;
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this.source = source;
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}
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error(err) {
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if (!this.isStopped) {
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const { source, count } = this;
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if (count === 0) {
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return super.error(err);
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}
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else if (count > -1) {
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this.count = count - 1;
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}
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source.subscribe(this._unsubscribeAndRecycle());
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}
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}
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}
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//# sourceMappingURL=retry.js.map
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