46 lines
1.0 KiB
TypeScript
46 lines
1.0 KiB
TypeScript
import { Subject } from './Subject';
|
|
import { Subscriber } from './Subscriber';
|
|
import { Subscription } from './Subscription';
|
|
|
|
/**
|
|
* @class AsyncSubject<T>
|
|
*/
|
|
export class AsyncSubject<T> extends Subject<T> {
|
|
private value: T = null;
|
|
private hasNext: boolean = false;
|
|
private hasCompleted: boolean = false;
|
|
|
|
/** @deprecated internal use only */ _subscribe(subscriber: Subscriber<any>): Subscription {
|
|
if (this.hasError) {
|
|
subscriber.error(this.thrownError);
|
|
return Subscription.EMPTY;
|
|
} else if (this.hasCompleted && this.hasNext) {
|
|
subscriber.next(this.value);
|
|
subscriber.complete();
|
|
return Subscription.EMPTY;
|
|
}
|
|
return super._subscribe(subscriber);
|
|
}
|
|
|
|
next(value: T): void {
|
|
if (!this.hasCompleted) {
|
|
this.value = value;
|
|
this.hasNext = true;
|
|
}
|
|
}
|
|
|
|
error(error: any): void {
|
|
if (!this.hasCompleted) {
|
|
super.error(error);
|
|
}
|
|
}
|
|
|
|
complete(): void {
|
|
this.hasCompleted = true;
|
|
if (this.hasNext) {
|
|
super.next(this.value);
|
|
}
|
|
super.complete();
|
|
}
|
|
}
|