rxjs-zone-less/es2015/scheduler/async/AsyncScheduler.js

A set of wrappers for RxJS to avoid unnecessary change detection and zone interference in Angular.

import { Scheduler } from '../scheduler';
export class AsyncScheduler extends Scheduler {
    constructor(SchedulerAction, now = Scheduler.now) {
        super(SchedulerAction, now);
        this.actions = [];
        /**
         * A flag to indicate whether the Scheduler is currently executing a batch of
         * queued actions.
         * @type {boolean}
         * @internal
         */
        this._active = false;
        /**
         * An internal ID used to track the latest asynchronous task such as those
         * coming from `setTimeout`, `setInterval`, `requestAnimationFrame`, and
         * others.
         * @type {any}
         * @internal
         */
        this._scheduled = undefined;
    }
    flush(action) {
        const { actions } = this;
        if (this._active) {
            actions.push(action);
            return;
        }
        let error;
        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;
        }
    }
}