import {Observable} from '../Observable';
import {Operator} from '../Operator';
import {Subscriber} from '../Subscriber';
import {Scheduler} from '../Scheduler';
import {asap} from '../scheduler/asap';
export function sampleTime<T>(delay: number, Ischeduler: Scheduler = asap): Observable<T> {
return this.lift(new SampleTimeOperator(delay, scheduler));
}
class SampleTimeOperator<T, R> implements Operator<T, R> {
constructor(private delay: number, private scheduler: Scheduler) {
}
call(subscriber: Subscriber<R>) {
return new SampleTimeSubscriber(subscriber, this.delay, this.scheduler);
}
}
class SampleTimeSubscriber<T> extends Subscriber<T> {
lastValue: T;
hasValue: boolean = false;
constructor(destination: Subscriber<T>, private delay: number, private scheduler: Scheduler) {
super(destination);
this.add(scheduler.schedule(dispatchNotification, delay, { subscriber: this, delay }));
}
_next(value: T) {
this.lastValue = value;
this.hasValue = true;
}
notifyNext() {
if (this.hasValue) {
this.destination.next(this.lastValue);
}
}
}
function dispatchNotification<T>(state) {
let { subscriber, delay } = state;
subscriber.notifyNext();
(<any>this).schedule(state, delay);
}
|