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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;
- }
- }
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