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import { Scheduler } from '../Scheduler';
import { AsyncAction } from './AsyncAction';
export class AsyncScheduler extends Scheduler {
public actions: Array<AsyncAction<any>> = [];
/**
* A flag to indicate whether the Scheduler is currently executing a batch of
* queued actions.
* @type {boolean}
*/
public active: boolean = false;
/**
* An internal ID used to track the latest asynchronous task such as those
* coming from `setTimeout`, `setInterval`, `requestAnimationFrame`, and
* others.
* @type {any}
*/
public scheduled: any = undefined;
public flush(action: AsyncAction<any>): void {
const {actions} = this;
if (this.active) {
actions.push(action);
return;
}
let error: any;
this.active = true;
do {
if (error = action.execute(action.state, action.delay)) {
break;
}
} while (action = actions.shift()); // exhaust the scheduler queue
this.active = false;
if (error) {
while (action = actions.shift()) {
action.unsubscribe();
}
throw error;
}
}
}