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import { Operator } from '../Operator';
import { IScheduler } from '../Scheduler';
import { Subscriber } from '../Subscriber';
import { Observable } from '../Observable';
import { TeardownLogic } from '../Subscription';
import { SubscribeOnObservable } from '../observable/SubscribeOnObservable';
import { MonoTypeOperatorFunction } from '../interfaces';
/**
* Asynchronously subscribes Observers to this Observable on the specified IScheduler.
*
* <img src="./img/subscribeOn.png" width="100%">
*
* @param {Scheduler} scheduler - The IScheduler to perform subscription actions on.
* @return {Observable<T>} The source Observable modified so that its subscriptions happen on the specified IScheduler.
.
* @method subscribeOn
* @owner Observable
*/
export function subscribeOn<T>(scheduler: IScheduler, delay: number = 0): MonoTypeOperatorFunction<T> {
return function subscribeOnOperatorFunction(source: Observable<T>): Observable<T> {
return source.lift(new SubscribeOnOperator<T>(scheduler, delay));
};
}
class SubscribeOnOperator<T> implements Operator<T, T> {
constructor(private scheduler: IScheduler,
private delay: number) {
}
call(subscriber: Subscriber<T>, source: any): TeardownLogic {
return new SubscribeOnObservable(
source, this.delay, this.scheduler
).subscribe(subscriber);
}
}