65 lines
2.7 KiB
JavaScript
65 lines
2.7 KiB
JavaScript
import { async } from '../scheduler/async';
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import { isScheduler } from '../util/isScheduler';
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import { bufferTime as higherOrder } from '../operators/bufferTime';
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/* tslint:enable:max-line-length */
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/**
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* Buffers the source Observable values for a specific time period.
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*
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* <span class="informal">Collects values from the past as an array, and emits
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* those arrays periodically in time.</span>
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*
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* <img src="./img/bufferTime.png" width="100%">
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*
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* Buffers values from the source for a specific time duration `bufferTimeSpan`.
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* Unless the optional argument `bufferCreationInterval` is given, it emits and
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* resets the buffer every `bufferTimeSpan` milliseconds. If
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* `bufferCreationInterval` is given, this operator opens the buffer every
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* `bufferCreationInterval` milliseconds and closes (emits and resets) the
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* buffer every `bufferTimeSpan` milliseconds. When the optional argument
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* `maxBufferSize` is specified, the buffer will be closed either after
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* `bufferTimeSpan` milliseconds or when it contains `maxBufferSize` elements.
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*
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* @example <caption>Every second, emit an array of the recent click events</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var buffered = clicks.bufferTime(1000);
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* buffered.subscribe(x => console.log(x));
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*
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* @example <caption>Every 5 seconds, emit the click events from the next 2 seconds</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var buffered = clicks.bufferTime(2000, 5000);
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* buffered.subscribe(x => console.log(x));
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*
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* @see {@link buffer}
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* @see {@link bufferCount}
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* @see {@link bufferToggle}
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* @see {@link bufferWhen}
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* @see {@link windowTime}
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*
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* @param {number} bufferTimeSpan The amount of time to fill each buffer array.
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* @param {number} [bufferCreationInterval] The interval at which to start new
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* buffers.
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* @param {number} [maxBufferSize] The maximum buffer size.
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* @param {Scheduler} [scheduler=async] The scheduler on which to schedule the
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* intervals that determine buffer boundaries.
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* @return {Observable<T[]>} An observable of arrays of buffered values.
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* @method bufferTime
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* @owner Observable
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*/
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export function bufferTime(bufferTimeSpan) {
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let length = arguments.length;
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let scheduler = async;
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if (isScheduler(arguments[arguments.length - 1])) {
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scheduler = arguments[arguments.length - 1];
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length--;
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}
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let bufferCreationInterval = null;
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if (length >= 2) {
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bufferCreationInterval = arguments[1];
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}
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let maxBufferSize = Number.POSITIVE_INFINITY;
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if (length >= 3) {
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maxBufferSize = arguments[2];
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}
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return higherOrder(bufferTimeSpan, bufferCreationInterval, maxBufferSize, scheduler)(this);
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}
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//# sourceMappingURL=bufferTime.js.map
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