68 lines
2.3 KiB
JavaScript
68 lines
2.3 KiB
JavaScript
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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/**
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* Buffers the source Observable values until `closingNotifier` emits.
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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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* that array only when another Observable emits.</span>
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*
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* <img src="./img/buffer.png" width="100%">
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*
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* Buffers the incoming Observable values until the given `closingNotifier`
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* Observable emits a value, at which point it emits the buffer on the output
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* Observable and starts a new buffer internally, awaiting the next time
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* `closingNotifier` emits.
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*
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* @example <caption>On every click, emit array of most recent interval events</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var interval = Rx.Observable.interval(1000);
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* var buffered = interval.buffer(clicks);
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* buffered.subscribe(x => console.log(x));
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*
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* @see {@link bufferCount}
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* @see {@link bufferTime}
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* @see {@link bufferToggle}
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* @see {@link bufferWhen}
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* @see {@link window}
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*
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* @param {Observable<any>} closingNotifier An Observable that signals the
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* buffer to be emitted on the output Observable.
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* @return {Observable<T[]>} An Observable of buffers, which are arrays of
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* values.
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* @method buffer
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* @owner Observable
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*/
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export function buffer(closingNotifier) {
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return function bufferOperatorFunction(source) {
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return source.lift(new BufferOperator(closingNotifier));
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};
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}
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class BufferOperator {
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constructor(closingNotifier) {
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this.closingNotifier = closingNotifier;
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}
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call(subscriber, source) {
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return source.subscribe(new BufferSubscriber(subscriber, this.closingNotifier));
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}
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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class BufferSubscriber extends OuterSubscriber {
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constructor(destination, closingNotifier) {
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super(destination);
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this.buffer = [];
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this.add(subscribeToResult(this, closingNotifier));
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}
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_next(value) {
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this.buffer.push(value);
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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const buffer = this.buffer;
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this.buffer = [];
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this.destination.next(buffer);
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}
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}
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//# sourceMappingURL=buffer.js.map
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