async.tsā¢1.56 kB
import { AsyncAction } from './AsyncAction';
import { AsyncScheduler } from './AsyncScheduler';
/**
*
* Async Scheduler
*
* <span class="informal">Schedule task as if you used setTimeout(task, duration)</span>
*
* `async` scheduler schedules tasks asynchronously, by putting them on the JavaScript
* event loop queue. It is best used to delay tasks in time or to schedule tasks repeating
* in intervals.
*
* If you just want to "defer" task, that is to perform it right after currently
* executing synchronous code ends (commonly achieved by `setTimeout(deferredTask, 0)`),
* better choice will be the {@link asapScheduler} scheduler.
*
* ## Examples
* Use async scheduler to delay task
* ```ts
* import { asyncScheduler } from 'rxjs';
*
* const task = () => console.log('it works!');
*
* asyncScheduler.schedule(task, 2000);
*
* // After 2 seconds logs:
* // "it works!"
* ```
*
* Use async scheduler to repeat task in intervals
* ```ts
* import { asyncScheduler } from 'rxjs';
*
* function task(state) {
* console.log(state);
* this.schedule(state + 1, 1000); // `this` references currently executing Action,
* // which we reschedule with new state and delay
* }
*
* asyncScheduler.schedule(task, 3000, 0);
*
* // Logs:
* // 0 after 3s
* // 1 after 4s
* // 2 after 5s
* // 3 after 6s
* ```
*/
export const asyncScheduler = new AsyncScheduler(AsyncAction);
/**
* @deprecated Renamed to {@link asyncScheduler}. Will be removed in v8.
*/
export const async = asyncScheduler;