es6/operator/repeatWhen.js

import { Subject } from '../Subject';
import { tryCatch } from '../util/tryCatch';
import { errorObject } from '../util/errorObject';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/**
 * 返回的 Observalbe 是源 Observable 的镜像，除了 `complete` 。如果源 Observable 调用了 `complete`，这个方法会发出给 `notifier`
 * 返回的 Observable 。如果这个 Observale 调用了 `complete` 或 `error`，那么这个方法会在子 subscription 上调用
 * `complete` 或 `error` 。否则，此方法将重新订阅源 Observable。
 *
 * <img src="./img/repeatWhen.png" width="100%">
 *
 * @param {function(notifications: Observable): Observable} notifier - 接收 Observable 的通知，用户可以该通知
 * 的 `complete` 或`error` 来中止重复。
 * @return {Observable} 使用重复逻辑修改过的源 Observable 。
 * @method repeatWhen
 * @owner Observable
 */
export function repeatWhen(notifier) {
    return this.lift(new RepeatWhenOperator(notifier));
}
class RepeatWhenOperator {
    constructor(notifier) {
        this.notifier = notifier;
    }
    call(subscriber, source) {
        return source.subscribe(new RepeatWhenSubscriber(subscriber, this.notifier, source));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class RepeatWhenSubscriber extends OuterSubscriber {
    constructor(destination, notifier, source) {
        super(destination);
        this.notifier = notifier;
        this.source = source;
        this.sourceIsBeingSubscribedTo = true;
    }
    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.sourceIsBeingSubscribedTo = true;
        this.source.subscribe(this);
    }
    notifyComplete(innerSub) {
        if (this.sourceIsBeingSubscribedTo === false) {
            return super.complete();
        }
    }
    complete() {
        this.sourceIsBeingSubscribedTo = false;
        if (!this.isStopped) {
            if (!this.retries) {
                this.subscribeToRetries();
            }
            else if (this.retriesSubscription.closed) {
                return super.complete();
            }
            this._unsubscribeAndRecycle();
            this.notifications.next();
        }
    }
    _unsubscribe() {
        const { notifications, retriesSubscription } = this;
        if (notifications) {
            notifications.unsubscribe();
            this.notifications = null;
        }
        if (retriesSubscription) {
            retriesSubscription.unsubscribe();
            this.retriesSubscription = null;
        }
        this.retries = null;
    }
    _unsubscribeAndRecycle() {
        const { notifications, retries, retriesSubscription } = this;
        this.notifications = null;
        this.retries = null;
        this.retriesSubscription = null;
        super._unsubscribeAndRecycle();
        this.notifications = notifications;
        this.retries = retries;
        this.retriesSubscription = retriesSubscription;
        return this;
    }
    subscribeToRetries() {
        this.notifications = new Subject();
        const retries = tryCatch(this.notifier)(this.notifications);
        if (retries === errorObject) {
            return super.complete();
        }
        this.retries = retries;
        this.retriesSubscription = subscribeToResult(this, retries);
    }
}
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