90 lines
3.0 KiB
JavaScript
90 lines
3.0 KiB
JavaScript
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import { Subject } from './Subject';
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import { queue } from './scheduler/queue';
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import { Subscription } from './Subscription';
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import { ObserveOnSubscriber } from './operators/observeOn';
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import { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';
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import { SubjectSubscription } from './SubjectSubscription';
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/**
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* @class ReplaySubject<T>
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*/
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export class ReplaySubject extends Subject {
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constructor(bufferSize = Number.POSITIVE_INFINITY, windowTime = Number.POSITIVE_INFINITY, scheduler) {
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super();
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this.scheduler = scheduler;
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this._events = [];
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this._bufferSize = bufferSize < 1 ? 1 : bufferSize;
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this._windowTime = windowTime < 1 ? 1 : windowTime;
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}
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next(value) {
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const now = this._getNow();
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this._events.push(new ReplayEvent(now, value));
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this._trimBufferThenGetEvents();
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super.next(value);
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}
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/** @deprecated internal use only */ _subscribe(subscriber) {
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const _events = this._trimBufferThenGetEvents();
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const scheduler = this.scheduler;
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let subscription;
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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}
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else if (this.hasError) {
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subscription = Subscription.EMPTY;
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}
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else if (this.isStopped) {
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subscription = Subscription.EMPTY;
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}
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else {
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this.observers.push(subscriber);
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subscription = new SubjectSubscription(this, subscriber);
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}
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if (scheduler) {
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subscriber.add(subscriber = new ObserveOnSubscriber(subscriber, scheduler));
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}
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const len = _events.length;
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for (let i = 0; i < len && !subscriber.closed; i++) {
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subscriber.next(_events[i].value);
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}
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if (this.hasError) {
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subscriber.error(this.thrownError);
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}
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else if (this.isStopped) {
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subscriber.complete();
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}
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return subscription;
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}
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_getNow() {
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return (this.scheduler || queue).now();
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}
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_trimBufferThenGetEvents() {
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const now = this._getNow();
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const _bufferSize = this._bufferSize;
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const _windowTime = this._windowTime;
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const _events = this._events;
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let eventsCount = _events.length;
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let spliceCount = 0;
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// Trim events that fall out of the time window.
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// Start at the front of the list. Break early once
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// we encounter an event that falls within the window.
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while (spliceCount < eventsCount) {
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if ((now - _events[spliceCount].time) < _windowTime) {
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break;
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}
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spliceCount++;
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}
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if (eventsCount > _bufferSize) {
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spliceCount = Math.max(spliceCount, eventsCount - _bufferSize);
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}
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if (spliceCount > 0) {
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_events.splice(0, spliceCount);
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}
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return _events;
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}
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}
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class ReplayEvent {
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constructor(time, value) {
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this.time = time;
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this.value = value;
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}
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}
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//# sourceMappingURL=ReplaySubject.js.map
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