es6/operators/retry.js

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