work.suroh.tk/node_modules/rxjs/_esm2015/ReplaySubject.js

90 lines
3.0 KiB
JavaScript

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