--- /dev/null
+import { async } from '../scheduler/async';
+import { isDate } from '../util/isDate';
+import { Subscriber } from '../Subscriber';
+import { Notification } from '../Notification';
+export function delay(delay, scheduler = async) {
+ const absoluteDelay = isDate(delay);
+ const delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);
+ return (source) => source.lift(new DelayOperator(delayFor, scheduler));
+}
+class DelayOperator {
+ constructor(delay, scheduler) {
+ this.delay = delay;
+ this.scheduler = scheduler;
+ }
+ call(subscriber, source) {
+ return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));
+ }
+}
+class DelaySubscriber extends Subscriber {
+ constructor(destination, delay, scheduler) {
+ super(destination);
+ this.delay = delay;
+ this.scheduler = scheduler;
+ this.queue = [];
+ this.active = false;
+ this.errored = false;
+ }
+ static dispatch(state) {
+ const source = state.source;
+ const queue = source.queue;
+ const scheduler = state.scheduler;
+ const destination = state.destination;
+ while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {
+ queue.shift().notification.observe(destination);
+ }
+ if (queue.length > 0) {
+ const delay = Math.max(0, queue[0].time - scheduler.now());
+ this.schedule(state, delay);
+ }
+ else {
+ this.unsubscribe();
+ source.active = false;
+ }
+ }
+ _schedule(scheduler) {
+ this.active = true;
+ const destination = this.destination;
+ destination.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {
+ source: this, destination: this.destination, scheduler: scheduler
+ }));
+ }
+ scheduleNotification(notification) {
+ if (this.errored === true) {
+ return;
+ }
+ const scheduler = this.scheduler;
+ const message = new DelayMessage(scheduler.now() + this.delay, notification);
+ this.queue.push(message);
+ if (this.active === false) {
+ this._schedule(scheduler);
+ }
+ }
+ _next(value) {
+ this.scheduleNotification(Notification.createNext(value));
+ }
+ _error(err) {
+ this.errored = true;
+ this.queue = [];
+ this.destination.error(err);
+ this.unsubscribe();
+ }
+ _complete() {
+ this.scheduleNotification(Notification.createComplete());
+ this.unsubscribe();
+ }
+}
+class DelayMessage {
+ constructor(time, notification) {
+ this.time = time;
+ this.notification = notification;
+ }
+}
+//# sourceMappingURL=delay.js.map
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