import { Immediate } from '../util/Immediate';
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import { AsyncAction } from './AsyncAction';
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import { AsapScheduler } from './AsapScheduler';
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import { SchedulerAction } from '../types';
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export class AsapAction<T> extends AsyncAction<T> {
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constructor(protected scheduler: AsapScheduler,
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protected work: (this: SchedulerAction<T>, state?: T) => void) {
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super(scheduler, work);
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}
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protected requestAsyncId(scheduler: AsapScheduler, id?: any, delay: number = 0): any {
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// If delay is greater than 0, request as an async action.
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if (delay !== null && delay > 0) {
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return super.requestAsyncId(scheduler, id, delay);
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}
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// Push the action to the end of the scheduler queue.
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scheduler.actions.push(this);
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// If a microtask has already been scheduled, don't schedule another
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// one. If a microtask hasn't been scheduled yet, schedule one now. Return
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// the current scheduled microtask id.
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return scheduler.scheduled || (scheduler.scheduled = Immediate.setImmediate(
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scheduler.flush.bind(scheduler, null)
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));
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}
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protected recycleAsyncId(scheduler: AsapScheduler, id?: any, delay: number = 0): any {
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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.recycleAsyncId(scheduler, id, delay);
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}
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// If the scheduler queue is empty, cancel the requested microtask and
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// set the scheduled flag to undefined so the next AsapAction will schedule
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// its own.
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if (scheduler.actions.length === 0) {
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Immediate.clearImmediate(id);
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scheduler.scheduled = undefined;
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}
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// Return undefined so the action knows to request a new async id if it's rescheduled.
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return undefined;
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}
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}
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