@reactivex/rxjs/dist/es6/operator/sampleTime.js

Reactive Extensions for modern JavaScript

import { Subscriber } from '../Subscriber';
import { async } from '../scheduler/async';
/**
 * @param delay
 * @param scheduler
 * @return {Observable<R>|WebSocketSubject<T>|Observable<T>}
 * @method sampleTime
 * @owner Observable
 */
export function sampleTime(delay, scheduler = async) {
    return this.lift(new SampleTimeOperator(delay, scheduler));
}
class SampleTimeOperator {
    constructor(delay, scheduler) {
        this.delay = delay;
        this.scheduler = scheduler;
    }
    call(subscriber, source) {
        return source._subscribe(new SampleTimeSubscriber(subscriber, this.delay, this.scheduler));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class SampleTimeSubscriber extends Subscriber {
    constructor(destination, delay, scheduler) {
        super(destination);
        this.delay = delay;
        this.scheduler = scheduler;
        this.hasValue = false;
        this.add(scheduler.schedule(dispatchNotification, delay, { subscriber: this, delay }));
    }
    _next(value) {
        this.lastValue = value;
        this.hasValue = true;
    }
    notifyNext() {
        if (this.hasValue) {
            this.hasValue = false;
            this.destination.next(this.lastValue);
        }
    }
}
function dispatchNotification(state) {
    let { subscriber, delay } = state;
    subscriber.notifyNext();
    this.schedule(state, delay);
}
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