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