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import { AsyncAction } from './AsyncAction';
import { AsapScheduler } from './AsapScheduler';
import { SchedulerAction } from '../types';
import { immediateProvider } from './immediateProvider';
import { TimerHandle } from './timerHandle';
export class AsapAction<T> extends AsyncAction<T> {
constructor(protected scheduler: AsapScheduler, protected work: (this: SchedulerAction<T>, state?: T) => void) {
super(scheduler, work);
}
protected requestAsyncId(scheduler: AsapScheduler, id?: TimerHandle, delay: number = 0): TimerHandle {
// If delay is greater than 0, request as an async action.
if (delay !== null && delay > 0) {
return super.requestAsyncId(scheduler, id, delay);
}
// Push the action to the end of the scheduler queue.
scheduler.actions.push(this);
// If a microtask has already been scheduled, don't schedule another
// one. If a microtask hasn't been scheduled yet, schedule one now. Return
// the current scheduled microtask id.
return scheduler._scheduled || (scheduler._scheduled = immediateProvider.setImmediate(scheduler.flush.bind(scheduler, undefined)));
}
protected recycleAsyncId(scheduler: AsapScheduler, id?: TimerHandle, delay: number = 0): TimerHandle | undefined {
// 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 : this.delay > 0) {
return super.recycleAsyncId(scheduler, id, delay);
}
// If the scheduler queue has no remaining actions with the same async id,
// cancel the requested microtask and set the scheduled flag to undefined
// so the next AsapAction will request its own.
const { actions } = scheduler;
if (id != null && actions[actions.length - 1]?.id !== id) {
immediateProvider.clearImmediate(id);
if (scheduler._scheduled === id) {
scheduler._scheduled = undefined;
}
}
// Return undefined so the action knows to request a new async id if it's rescheduled.
return undefined;
}
}