50 lines
2.1 KiB
JavaScript
50 lines
2.1 KiB
JavaScript
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import { Subject } from './Subject';
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import { dateTimestampProvider } from './scheduler/dateTimestampProvider';
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export class ReplaySubject extends Subject {
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constructor(_bufferSize = Infinity, _windowTime = Infinity, _timestampProvider = dateTimestampProvider) {
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super();
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this._bufferSize = _bufferSize;
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this._windowTime = _windowTime;
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this._timestampProvider = _timestampProvider;
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this._buffer = [];
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this._infiniteTimeWindow = true;
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this._infiniteTimeWindow = _windowTime === Infinity;
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this._bufferSize = Math.max(1, _bufferSize);
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this._windowTime = Math.max(1, _windowTime);
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}
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next(value) {
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const { isStopped, _buffer, _infiniteTimeWindow, _timestampProvider, _windowTime } = this;
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if (!isStopped) {
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_buffer.push(value);
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!_infiniteTimeWindow && _buffer.push(_timestampProvider.now() + _windowTime);
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}
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this._trimBuffer();
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super.next(value);
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}
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_subscribe(subscriber) {
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this._throwIfClosed();
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this._trimBuffer();
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const subscription = this._innerSubscribe(subscriber);
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const { _infiniteTimeWindow, _buffer } = this;
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const copy = _buffer.slice();
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for (let i = 0; i < copy.length && !subscriber.closed; i += _infiniteTimeWindow ? 1 : 2) {
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subscriber.next(copy[i]);
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}
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this._checkFinalizedStatuses(subscriber);
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return subscription;
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}
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_trimBuffer() {
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const { _bufferSize, _timestampProvider, _buffer, _infiniteTimeWindow } = this;
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const adjustedBufferSize = (_infiniteTimeWindow ? 1 : 2) * _bufferSize;
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_bufferSize < Infinity && adjustedBufferSize < _buffer.length && _buffer.splice(0, _buffer.length - adjustedBufferSize);
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if (!_infiniteTimeWindow) {
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const now = _timestampProvider.now();
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let last = 0;
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for (let i = 1; i < _buffer.length && _buffer[i] <= now; i += 2) {
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last = i;
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}
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last && _buffer.splice(0, last + 1);
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}
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}
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}
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//# sourceMappingURL=ReplaySubject.js.map
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