import {Operator} from '../Operator';
import {Subscriber} from '../Subscriber';
import {Scheduler} from '../Scheduler';
import {Subscription} from '../Subscription';
import {asap} from '../scheduler/asap';
import {Observable} from '../Observable';
export function throttleTime<T>(delay: number, scheduler: Scheduler = asap): Observable<T> {
return this.lift(new ThrottleTimeOperator(delay, scheduler));
}
class ThrottleTimeOperator<T> implements Operator<T, T> {
constructor(private delay: number, private scheduler: Scheduler) {
}
call(subscriber: Subscriber<T>): Subscriber<T> {
return new ThrottleTimeSubscriber(subscriber, this.delay, this.scheduler);
}
}
class ThrottleTimeSubscriber<T> extends Subscriber<T> {
private throttled: Subscription;
constructor(destination: Subscriber<T>,
private delay: number,
private scheduler: Scheduler) {
super(destination);
}
protected _next(value: T) {
if (!this.throttled) {
this.add(this.throttled = this.scheduler.schedule(dispatchNext, this.delay, { subscriber: this }));
this.destination.next(value);
}
}
clearThrottle() {
const throttled = this.throttled;
Eif (throttled) {
throttled.unsubscribe();
this.remove(throttled);
this.throttled = null;
}
}
}
function dispatchNext<T>({ subscriber }) {
subscriber.clearThrottle();
}
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