work.suroh.tk/node_modules/rxjs/operators/observeOn.js

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subscriber_1 = require('../Subscriber');
var Notification_1 = require('../Notification');
/**
 *
 * Re-emits all notifications from source Observable with specified scheduler.
 *
 * <span class="informal">Ensure a specific scheduler is used, from outside of an Observable.</span>
 *
 * `observeOn` is an operator that accepts a scheduler as a first parameter, which will be used to reschedule
 * notifications emitted by the source Observable. It might be useful, if you do not have control over
 * internal scheduler of a given Observable, but want to control when its values are emitted nevertheless.
 *
 * Returned Observable emits the same notifications (nexted values, complete and error events) as the source Observable,
 * but rescheduled with provided scheduler. Note that this doesn't mean that source Observables internal
 * scheduler will be replaced in any way. Original scheduler still will be used, but when the source Observable emits
 * notification, it will be immediately scheduled again - this time with scheduler passed to `observeOn`.
 * An anti-pattern would be calling `observeOn` on Observable that emits lots of values synchronously, to split
 * that emissions into asynchronous chunks. For this to happen, scheduler would have to be passed into the source
 * Observable directly (usually into the operator that creates it). `observeOn` simply delays notifications a
 * little bit more, to ensure that they are emitted at expected moments.
 *
 * As a matter of fact, `observeOn` accepts second parameter, which specifies in milliseconds with what delay notifications
 * will be emitted. The main difference between {@link delay} operator and `observeOn` is that `observeOn`
 * will delay all notifications - including error notifications - while `delay` will pass through error
 * from source Observable immediately when it is emitted. In general it is highly recommended to use `delay` operator
 * for any kind of delaying of values in the stream, while using `observeOn` to specify which scheduler should be used
 * for notification emissions in general.
 *
 * @example <caption>Ensure values in subscribe are called just before browser repaint.</caption>
 * const intervals = Rx.Observable.interval(10); // Intervals are scheduled
 *                                               // with async scheduler by default...
 *
 * intervals
 * .observeOn(Rx.Scheduler.animationFrame)       // ...but we will observe on animationFrame
 * .subscribe(val => {                           // scheduler to ensure smooth animation.
 *   someDiv.style.height = val + 'px';
 * });
 *
 * @see {@link delay}
 *
 * @param {IScheduler} scheduler Scheduler that will be used to reschedule notifications from source Observable.
 * @param {number} [delay] Number of milliseconds that states with what delay every notification should be rescheduled.
 * @return {Observable<T>} Observable that emits the same notifications as the source Observable,
 * but with provided scheduler.
 *
 * @method observeOn
 * @owner Observable
 */
function observeOn(scheduler, delay) {
    if (delay === void 0) { delay = 0; }
    return function observeOnOperatorFunction(source) {
        return source.lift(new ObserveOnOperator(scheduler, delay));
    };
}
exports.observeOn = observeOn;
var ObserveOnOperator = (function () {
    function ObserveOnOperator(scheduler, delay) {
        if (delay === void 0) { delay = 0; }
        this.scheduler = scheduler;
        this.delay = delay;
    }
    ObserveOnOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));
    };
    return ObserveOnOperator;
}());
exports.ObserveOnOperator = ObserveOnOperator;
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var ObserveOnSubscriber = (function (_super) {
    __extends(ObserveOnSubscriber, _super);
    function ObserveOnSubscriber(destination, scheduler, delay) {
        if (delay === void 0) { delay = 0; }
        _super.call(this, destination);
        this.scheduler = scheduler;
        this.delay = delay;
    }
    ObserveOnSubscriber.dispatch = function (arg) {
        var notification = arg.notification, destination = arg.destination;
        notification.observe(destination);
        this.unsubscribe();
    };
    ObserveOnSubscriber.prototype.scheduleMessage = function (notification) {
        this.add(this.scheduler.schedule(ObserveOnSubscriber.dispatch, this.delay, new ObserveOnMessage(notification, this.destination)));
    };
    ObserveOnSubscriber.prototype._next = function (value) {
        this.scheduleMessage(Notification_1.Notification.createNext(value));
    };
    ObserveOnSubscriber.prototype._error = function (err) {
        this.scheduleMessage(Notification_1.Notification.createError(err));
    };
    ObserveOnSubscriber.prototype._complete = function () {
        this.scheduleMessage(Notification_1.Notification.createComplete());
    };
    return ObserveOnSubscriber;
}(Subscriber_1.Subscriber));
exports.ObserveOnSubscriber = ObserveOnSubscriber;
var ObserveOnMessage = (function () {
    function ObserveOnMessage(notification, destination) {
        this.notification = notification;
        this.destination = destination;
    }
    return ObserveOnMessage;
}());
exports.ObserveOnMessage = ObserveOnMessage;
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