126 lines
4.7 KiB
JavaScript
Executable File
126 lines
4.7 KiB
JavaScript
Executable File
/** PURE_IMPORTS_START .._Subscription,.._util_tryCatch,.._util_errorObject,.._OuterSubscriber,.._util_subscribeToResult PURE_IMPORTS_END */
|
|
var __extends = (this && this.__extends) || function (d, b) {
|
|
for (var p in b)
|
|
if (b.hasOwnProperty(p))
|
|
d[p] = b[p];
|
|
function __() { this.constructor = d; }
|
|
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
|
|
};
|
|
import { Subscription } from '../Subscription';
|
|
import { tryCatch } from '../util/tryCatch';
|
|
import { errorObject } from '../util/errorObject';
|
|
import { OuterSubscriber } from '../OuterSubscriber';
|
|
import { subscribeToResult } from '../util/subscribeToResult';
|
|
/**
|
|
* 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>
|
|
*
|
|
* <img src="./img/bufferWhen.png" width="100%">
|
|
*
|
|
* 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 <caption>Emit an array of the last clicks every [1-5] random seconds</caption>
|
|
* var clicks = Rx.Observable.fromEvent(document, 'click');
|
|
* var buffered = clicks.bufferWhen(() =>
|
|
* Rx.Observable.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
|
|
*/
|
|
export function bufferWhen(closingSelector) {
|
|
return function (source) {
|
|
return source.lift(new BufferWhenOperator(closingSelector));
|
|
};
|
|
}
|
|
var BufferWhenOperator = /*@__PURE__*/ (/*@__PURE__*/ 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 = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
|
|
__extends(BufferWhenSubscriber, _super);
|
|
function BufferWhenSubscriber(destination, closingSelector) {
|
|
_super.call(this, destination);
|
|
this.closingSelector = closingSelector;
|
|
this.subscribing = false;
|
|
this.openBuffer();
|
|
}
|
|
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 internal use only */ BufferWhenSubscriber.prototype._unsubscribe = function () {
|
|
this.buffer = null;
|
|
this.subscribing = false;
|
|
};
|
|
BufferWhenSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
|
|
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 = tryCatch(this.closingSelector)();
|
|
if (closingNotifier === errorObject) {
|
|
this.error(errorObject.e);
|
|
}
|
|
else {
|
|
closingSubscription = new Subscription();
|
|
this.closingSubscription = closingSubscription;
|
|
this.add(closingSubscription);
|
|
this.subscribing = true;
|
|
closingSubscription.add(subscribeToResult(this, closingNotifier));
|
|
this.subscribing = false;
|
|
}
|
|
};
|
|
return BufferWhenSubscriber;
|
|
}(OuterSubscriber));
|
|
//# sourceMappingURL=bufferWhen.js.map
|