@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
143 lines • 5.16 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
}
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var Subscription_1 = require("../Subscription");
var innerSubscribe_1 = require("../innerSubscribe");
/**
* Buffers the source Observable values, using a factory function of closing
* Observables to determine when to close, emit, and reset the buffer.
*
* <span class="informal">Collects values from the past as an array. When it
* starts collecting values, it calls a function that returns an Observable that
* tells when to close the buffer and restart collecting.</span>
*
* 
*
* Opens a buffer immediately, then closes the buffer when the observable
* returned by calling `closingSelector` function emits a value. When it closes
* the buffer, it immediately opens a new buffer and repeats the process.
*
* ## Example
*
* Emit an array of the last clicks every [1-5] random seconds
*
* ```ts
* import { fromEvent, interval } from 'rxjs';
* import { bufferWhen } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const buffered = clicks.pipe(bufferWhen(() =>
* interval(1000 + Math.random() * 4000)
* ));
* buffered.subscribe(x => console.log(x));
* ```
*
*
* @see {@link buffer}
* @see {@link bufferCount}
* @see {@link bufferTime}
* @see {@link bufferToggle}
* @see {@link windowWhen}
*
* @param {function(): Observable} closingSelector A function that takes no
* arguments and returns an Observable that signals buffer closure.
* @return {Observable<T[]>} An observable of arrays of buffered values.
* @method bufferWhen
* @owner Observable
*/
function bufferWhen(closingSelector) {
return function (source) {
return source.lift(new BufferWhenOperator(closingSelector));
};
}
exports.bufferWhen = bufferWhen;
var BufferWhenOperator = /** @class */ (function () {
function BufferWhenOperator(closingSelector) {
this.closingSelector = closingSelector;
}
BufferWhenOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new BufferWhenSubscriber(subscriber, this.closingSelector));
};
return BufferWhenOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var BufferWhenSubscriber = /** @class */ (function (_super) {
__extends(BufferWhenSubscriber, _super);
function BufferWhenSubscriber(destination, closingSelector) {
var _this = _super.call(this, destination) || this;
_this.closingSelector = closingSelector;
_this.subscribing = false;
_this.openBuffer();
return _this;
}
BufferWhenSubscriber.prototype._next = function (value) {
this.buffer.push(value);
};
BufferWhenSubscriber.prototype._complete = function () {
var buffer = this.buffer;
if (buffer) {
this.destination.next(buffer);
}
_super.prototype._complete.call(this);
};
/** @deprecated This is an internal implementation detail, do not use. */
BufferWhenSubscriber.prototype._unsubscribe = function () {
this.buffer = undefined;
this.subscribing = false;
};
BufferWhenSubscriber.prototype.notifyNext = function () {
this.openBuffer();
};
BufferWhenSubscriber.prototype.notifyComplete = function () {
if (this.subscribing) {
this.complete();
}
else {
this.openBuffer();
}
};
BufferWhenSubscriber.prototype.openBuffer = function () {
var closingSubscription = this.closingSubscription;
if (closingSubscription) {
this.remove(closingSubscription);
closingSubscription.unsubscribe();
}
var buffer = this.buffer;
if (this.buffer) {
this.destination.next(buffer);
}
this.buffer = [];
var closingNotifier;
try {
var closingSelector = this.closingSelector;
closingNotifier = closingSelector();
}
catch (err) {
return this.error(err);
}
closingSubscription = new Subscription_1.Subscription();
this.closingSubscription = closingSubscription;
this.add(closingSubscription);
this.subscribing = true;
closingSubscription.add(innerSubscribe_1.innerSubscribe(closingNotifier, new innerSubscribe_1.SimpleInnerSubscriber(this)));
this.subscribing = false;
};
return BufferWhenSubscriber;
}(innerSubscribe_1.SimpleOuterSubscriber));
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