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- import { AsyncAction } from './AsyncAction';
- import { Subscription } from '../Subscription';
- import { QueueScheduler } from './QueueScheduler';
- import { SchedulerAction } from '../types';
- import { TimerHandle } from './timerHandle';
- export class QueueAction<T> extends AsyncAction<T> {
- constructor(protected scheduler: QueueScheduler, protected work: (this: SchedulerAction<T>, state?: T) => void) {
- super(scheduler, work);
- }
- public schedule(state?: T, delay: number = 0): Subscription {
- if (delay > 0) {
- return super.schedule(state, delay);
- }
- this.delay = delay;
- this.state = state;
- this.scheduler.flush(this);
- return this;
- }
- public execute(state: T, delay: number): any {
- return delay > 0 || this.closed ? super.execute(state, delay) : this._execute(state, delay);
- }
- protected requestAsyncId(scheduler: QueueScheduler, id?: TimerHandle, delay: number = 0): TimerHandle {
- // If delay exists and is greater than 0, or if the delay is null (the
- // action wasn't rescheduled) but was originally scheduled as an async
- // action, then recycle as an async action.
- if ((delay != null && delay > 0) || (delay == null && this.delay > 0)) {
- return super.requestAsyncId(scheduler, id, delay);
- }
- // Otherwise flush the scheduler starting with this action.
- scheduler.flush(this);
- // HACK: In the past, this was returning `void`. However, `void` isn't a valid
- // `TimerHandle`, and generally the return value here isn't really used. So the
- // compromise is to return `0` which is both "falsy" and a valid `TimerHandle`,
- // as opposed to refactoring every other instanceo of `requestAsyncId`.
- return 0;
- }
- }
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