es6/operator/retryWhen.js

import { Subject } from '../Subject';
import { tryCatch } from '../util/tryCatch';
import { errorObject } from '../util/errorObject';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/**
 * 返回一个 Observable， 该 Observable 是源 Observable 不包含错误异常的镜像。 如果源头 Observable 触发
 * `error`， 这个方法会发出引起错误的 Throwable 给 `notifier` 返回的 Observable。 如果该 Observable 触发 `complete` 或者 `error`
 * 则该方法会使子订阅触发 `complete` 和 `error`。 否则该方法会重新订阅源 Observable。
 *
 * <img src="./img/retryWhen.png" width="100%">
 *
 * @param {function(errors: Observable): Observable} notifier - 接受一个用户可以`complete` 或者 `error`的通知型 Observable， 终止重试。
 * @return {Observable} 使用重试逻辑修改过的源 Observable。
 * @method retryWhen
 * @owner Observable
 */
export function retryWhen(notifier) {
    return this.lift(new RetryWhenOperator(notifier, this));
}
class RetryWhenOperator {
    constructor(notifier, source) {
        this.notifier = notifier;
        this.source = source;
    }
    call(subscriber, source) {
        return source.subscribe(new RetryWhenSubscriber(subscriber, this.notifier, this.source));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class RetryWhenSubscriber extends OuterSubscriber {
    constructor(destination, notifier, source) {
        super(destination);
        this.notifier = notifier;
        this.source = source;
    }
    error(err) {
        if (!this.isStopped) {
            let errors = this.errors;
            let retries = this.retries;
            let retriesSubscription = this.retriesSubscription;
            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;
            }
            this._unsubscribeAndRecycle();
            this.errors = errors;
            this.retries = retries;
            this.retriesSubscription = retriesSubscription;
            errors.next(err);
        }
    }
    _unsubscribe() {
        const { errors, retriesSubscription } = this;
        if (errors) {
            errors.unsubscribe();
            this.errors = null;
        }
        if (retriesSubscription) {
            retriesSubscription.unsubscribe();
            this.retriesSubscription = null;
        }
        this.retries = null;
    }
    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        const { errors, retries, retriesSubscription } = this;
        this.errors = null;
        this.retries = null;
        this.retriesSubscription = null;
        this._unsubscribeAndRecycle();
        this.errors = errors;
        this.retries = retries;
        this.retriesSubscription = retriesSubscription;
        this.source.subscribe(this);
    }
}
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