rxjs
Version:
Reactive Extensions for modern JavaScript
58 lines (48 loc) • 1.32 kB
text/typescript
import { IScheduler } from '../Scheduler';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { TeardownLogic } from '../Subscription';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class ScalarObservable<T> extends Observable<T> {
static create<T>(value: T, scheduler?: IScheduler): ScalarObservable<T> {
return new ScalarObservable(value, scheduler);
}
static dispatch(state: any): void {
const { done, value, subscriber } = state;
if (done) {
subscriber.complete();
return;
}
subscriber.next(value);
if (subscriber.closed) {
return;
}
state.done = true;
(<any> this).schedule(state);
}
_isScalar: boolean = true;
constructor(public value: T, private scheduler?: IScheduler) {
super();
if (scheduler) {
this._isScalar = false;
}
}
protected _subscribe(subscriber: Subscriber<T>): TeardownLogic {
const value = this.value;
const scheduler = this.scheduler;
if (scheduler) {
return scheduler.schedule(ScalarObservable.dispatch, 0, {
done: false, value, subscriber
});
} else {
subscriber.next(value);
if (!subscriber.closed) {
subscriber.complete();
}
}
}
}