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node_modules/rxjs/_esm2015/operators/observeOn.js

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+import { Subscriber } from '../Subscriber';
+import { Notification } from '../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
+ */
+export function observeOn(scheduler, delay = 0) {
+    return function observeOnOperatorFunction(source) {
+        return source.lift(new ObserveOnOperator(scheduler, delay));
+    };
+}
+export class ObserveOnOperator {
+    constructor(scheduler, delay = 0) {
+        this.scheduler = scheduler;
+        this.delay = delay;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class ObserveOnSubscriber extends Subscriber {
+    constructor(destination, scheduler, delay = 0) {
+        super(destination);
+        this.scheduler = scheduler;
+        this.delay = delay;
+    }
+    static dispatch(arg) {
+        const { notification, destination } = arg;
+        notification.observe(destination);
+        this.unsubscribe();
+    }
+    scheduleMessage(notification) {
+        this.add(this.scheduler.schedule(ObserveOnSubscriber.dispatch, this.delay, new ObserveOnMessage(notification, this.destination)));
+    }
+    _next(value) {
+        this.scheduleMessage(Notification.createNext(value));
+    }
+    _error(err) {
+        this.scheduleMessage(Notification.createError(err));
+    }
+    _complete() {
+        this.scheduleMessage(Notification.createComplete());
+    }
+}
+export class ObserveOnMessage {
+    constructor(notification, destination) {
+        this.notification = notification;
+        this.destination = destination;
+    }
+}
+//# sourceMappingURL=observeOn.js.map