@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
167 lines • 6.12 kB
JavaScript
;
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 Subscriber_1 = require("../Subscriber");
/**
* Buffers the source Observable values until the size hits the maximum
* `bufferSize` given.
*
* <span class="informal">Collects values from the past as an array, and emits
* that array only when its size reaches `bufferSize`.</span>
*
* 
*
* Buffers a number of values from the source Observable by `bufferSize` then
* emits the buffer and clears it, and starts a new buffer each
* `startBufferEvery` values. If `startBufferEvery` is not provided or is
* `null`, then new buffers are started immediately at the start of the source
* and when each buffer closes and is emitted.
*
* ## Examples
*
* Emit the last two click events as an array
*
* ```ts
* import { fromEvent } from 'rxjs';
* import { bufferCount } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const buffered = clicks.pipe(bufferCount(2));
* buffered.subscribe(x => console.log(x));
* ```
*
* On every click, emit the last two click events as an array
*
* ```ts
* import { fromEvent } from 'rxjs';
* import { bufferCount } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const buffered = clicks.pipe(bufferCount(2, 1));
* buffered.subscribe(x => console.log(x));
* ```
*
* @see {@link buffer}
* @see {@link bufferTime}
* @see {@link bufferToggle}
* @see {@link bufferWhen}
* @see {@link pairwise}
* @see {@link windowCount}
*
* @param {number} bufferSize The maximum size of the buffer emitted.
* @param {number} [startBufferEvery] Interval at which to start a new buffer.
* For example if `startBufferEvery` is `2`, then a new buffer will be started
* on every other value from the source. A new buffer is started at the
* beginning of the source by default.
* @return {Observable<T[]>} An Observable of arrays of buffered values.
* @method bufferCount
* @owner Observable
*/
function bufferCount(bufferSize, startBufferEvery) {
if (startBufferEvery === void 0) { startBufferEvery = null; }
return function bufferCountOperatorFunction(source) {
return source.lift(new BufferCountOperator(bufferSize, startBufferEvery));
};
}
exports.bufferCount = bufferCount;
var BufferCountOperator = /** @class */ (function () {
function BufferCountOperator(bufferSize, startBufferEvery) {
this.bufferSize = bufferSize;
this.startBufferEvery = startBufferEvery;
if (!startBufferEvery || bufferSize === startBufferEvery) {
this.subscriberClass = BufferCountSubscriber;
}
else {
this.subscriberClass = BufferSkipCountSubscriber;
}
}
BufferCountOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new this.subscriberClass(subscriber, this.bufferSize, this.startBufferEvery));
};
return BufferCountOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var BufferCountSubscriber = /** @class */ (function (_super) {
__extends(BufferCountSubscriber, _super);
function BufferCountSubscriber(destination, bufferSize) {
var _this = _super.call(this, destination) || this;
_this.bufferSize = bufferSize;
_this.buffer = [];
return _this;
}
BufferCountSubscriber.prototype._next = function (value) {
var buffer = this.buffer;
buffer.push(value);
if (buffer.length == this.bufferSize) {
this.destination.next(buffer);
this.buffer = [];
}
};
BufferCountSubscriber.prototype._complete = function () {
var buffer = this.buffer;
if (buffer.length > 0) {
this.destination.next(buffer);
}
_super.prototype._complete.call(this);
};
return BufferCountSubscriber;
}(Subscriber_1.Subscriber));
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var BufferSkipCountSubscriber = /** @class */ (function (_super) {
__extends(BufferSkipCountSubscriber, _super);
function BufferSkipCountSubscriber(destination, bufferSize, startBufferEvery) {
var _this = _super.call(this, destination) || this;
_this.bufferSize = bufferSize;
_this.startBufferEvery = startBufferEvery;
_this.buffers = [];
_this.count = 0;
return _this;
}
BufferSkipCountSubscriber.prototype._next = function (value) {
var _a = this, bufferSize = _a.bufferSize, startBufferEvery = _a.startBufferEvery, buffers = _a.buffers, count = _a.count;
this.count++;
if (count % startBufferEvery === 0) {
buffers.push([]);
}
for (var i = buffers.length; i--;) {
var buffer = buffers[i];
buffer.push(value);
if (buffer.length === bufferSize) {
buffers.splice(i, 1);
this.destination.next(buffer);
}
}
};
BufferSkipCountSubscriber.prototype._complete = function () {
var _a = this, buffers = _a.buffers, destination = _a.destination;
while (buffers.length > 0) {
var buffer = buffers.shift();
if (buffer.length > 0) {
destination.next(buffer);
}
}
_super.prototype._complete.call(this);
};
return BufferSkipCountSubscriber;
}(Subscriber_1.Subscriber));
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