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import { Subscriber } from '../Subscriber';
import { async } from '../scheduler/async';
export function sampleTime(period, scheduler = async) {
    return (source) => source.lift(new SampleTimeOperator(period, scheduler));
}
class SampleTimeOperator {
    constructor(period, scheduler) {
        this.period = period;
        this.scheduler = scheduler;
    }
    call(subscriber, source) {
        return source.subscribe(new SampleTimeSubscriber(subscriber, this.period, this.scheduler));
    }
}
class SampleTimeSubscriber extends Subscriber {
    constructor(destination, period, scheduler) {
        super(destination);
        this.period = period;
        this.scheduler = scheduler;
        this.hasValue = false;
        this.add(scheduler.schedule(dispatchNotification, period, { subscriber: this, period }));
    }
    _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, period } = state;
    subscriber.notifyNext();
    this.schedule(state, period);
}
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