| import { Immediate } from '../util/Immediate'; |
| import { AsyncAction } from './AsyncAction'; |
| import { AsapScheduler } from './AsapScheduler'; |
| import { SchedulerAction } from '../types'; |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @ignore |
| * @extends {Ignored} |
| */ |
| 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?: any, delay: number = 0): any { |
| // 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 = Immediate.setImmediate( |
| scheduler.flush.bind(scheduler, null) |
| )); |
| } |
| protected recycleAsyncId(scheduler: AsapScheduler, id?: any, delay: number = 0): any { |
| // 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.recycleAsyncId(scheduler, id, delay); |
| } |
| // If the scheduler queue is empty, cancel the requested microtask and |
| // set the scheduled flag to undefined so the next AsapAction will schedule |
| // its own. |
| if (scheduler.actions.length === 0) { |
| Immediate.clearImmediate(id); |
| scheduler.scheduled = undefined; |
| } |
| // Return undefined so the action knows to request a new async id if it's rescheduled. |
| return undefined; |
| } |
| } |