@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
158 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");
var Subject_1 = require("../Subject");
/**
* Branch out the source Observable values as a nested Observable with each
* nested Observable emitting at most `windowSize` values.
*
* <span class="informal">It's like {@link bufferCount}, but emits a nested
* Observable instead of an array.</span>
*
* 
*
* Returns an Observable that emits windows of items it collects from the source
* Observable. The output Observable emits windows every `startWindowEvery`
* items, each containing no more than `windowSize` items. When the source
* Observable completes or encounters an error, the output Observable emits
* the current window and propagates the notification from the source
* Observable. If `startWindowEvery` is not provided, then new windows are
* started immediately at the start of the source and when each window completes
* with size `windowSize`.
*
* ## Examples
* Ignore every 3rd click event, starting from the first one
* ```ts
* import { fromEvent } from 'rxjs';
* import { windowCount, map, mergeAll, skip } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* windowCount(3),
* map(win => win.pipe(skip(1))), // skip first of every 3 clicks
* mergeAll() // flatten the Observable-of-Observables
* );
* result.subscribe(x => console.log(x));
* ```
*
* Ignore every 3rd click event, starting from the third one
* ```ts
* import { fromEvent } from 'rxjs';
* import { windowCount, mergeAll } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(
* windowCount(2, 3),
* mergeAll(), // flatten the Observable-of-Observables
* );
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link window}
* @see {@link windowTime}
* @see {@link windowToggle}
* @see {@link windowWhen}
* @see {@link bufferCount}
*
* @param {number} windowSize The maximum number of values emitted by each
* window.
* @param {number} [startWindowEvery] Interval at which to start a new window.
* For example if `startWindowEvery` is `2`, then a new window will be started
* on every other value from the source. A new window is started at the
* beginning of the source by default.
* @return {Observable<Observable<T>>} An Observable of windows, which in turn
* are Observable of values.
* @method windowCount
* @owner Observable
*/
function windowCount(windowSize, startWindowEvery) {
if (startWindowEvery === void 0) { startWindowEvery = 0; }
return function windowCountOperatorFunction(source) {
return source.lift(new WindowCountOperator(windowSize, startWindowEvery));
};
}
exports.windowCount = windowCount;
var WindowCountOperator = /** @class */ (function () {
function WindowCountOperator(windowSize, startWindowEvery) {
this.windowSize = windowSize;
this.startWindowEvery = startWindowEvery;
}
WindowCountOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new WindowCountSubscriber(subscriber, this.windowSize, this.startWindowEvery));
};
return WindowCountOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var WindowCountSubscriber = /** @class */ (function (_super) {
__extends(WindowCountSubscriber, _super);
function WindowCountSubscriber(destination, windowSize, startWindowEvery) {
var _this = _super.call(this, destination) || this;
_this.destination = destination;
_this.windowSize = windowSize;
_this.startWindowEvery = startWindowEvery;
_this.windows = [new Subject_1.Subject()];
_this.count = 0;
destination.next(_this.windows[0]);
return _this;
}
WindowCountSubscriber.prototype._next = function (value) {
var startWindowEvery = (this.startWindowEvery > 0) ? this.startWindowEvery : this.windowSize;
var destination = this.destination;
var windowSize = this.windowSize;
var windows = this.windows;
var len = windows.length;
for (var i = 0; i < len && !this.closed; i++) {
windows[i].next(value);
}
var c = this.count - windowSize + 1;
if (c >= 0 && c % startWindowEvery === 0 && !this.closed) {
windows.shift().complete();
}
if (++this.count % startWindowEvery === 0 && !this.closed) {
var window_1 = new Subject_1.Subject();
windows.push(window_1);
destination.next(window_1);
}
};
WindowCountSubscriber.prototype._error = function (err) {
var windows = this.windows;
if (windows) {
while (windows.length > 0 && !this.closed) {
windows.shift().error(err);
}
}
this.destination.error(err);
};
WindowCountSubscriber.prototype._complete = function () {
var windows = this.windows;
if (windows) {
while (windows.length > 0 && !this.closed) {
windows.shift().complete();
}
}
this.destination.complete();
};
WindowCountSubscriber.prototype._unsubscribe = function () {
this.count = 0;
this.windows = null;
};
return WindowCountSubscriber;
}(Subscriber_1.Subscriber));
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