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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;
}
}