mergeAll.js
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"use strict";
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 __());
};
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../util/subscribeToResult');
/**
* Converts a higher-order Observable into a first-order Observable which
* concurrently delivers all values that are emitted on the inner Observables.
*
* <span class="informal">Flattens an Observable-of-Observables.</span>
*
* <img src="./img/mergeAll.png" width="100%">
*
* `mergeAll` subscribes to an Observable that emits Observables, also known as
* a higher-order Observable. Each time it observes one of these emitted inner
* Observables, it subscribes to that and delivers all the values from the
* inner Observable on the output Observable. The output Observable only
* completes once all inner Observables have completed. Any error delivered by
* a inner Observable will be immediately emitted on the output Observable.
*
* @example <caption>Spawn a new interval Observable for each click event, and blend their outputs as one Observable</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
* var firstOrder = higherOrder.mergeAll();
* firstOrder.subscribe(x => console.log(x));
*
* @example <caption>Count from 0 to 9 every second for each click, but only allow 2 concurrent timers</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(10));
* var firstOrder = higherOrder.mergeAll(2);
* firstOrder.subscribe(x => console.log(x));
*
* @see {@link combineAll}
* @see {@link concatAll}
* @see {@link exhaust}
* @see {@link merge}
* @see {@link mergeMap}
* @see {@link mergeMapTo}
* @see {@link mergeScan}
* @see {@link switch}
* @see {@link zipAll}
*
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of inner
* Observables being subscribed to concurrently.
* @return {Observable} An Observable that emits values coming from all the
* inner Observables emitted by the source Observable.
* @method mergeAll
* @owner Observable
*/
function mergeAll(concurrent) {
if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
return this.lift(new MergeAllOperator(concurrent));
}
exports.mergeAll = mergeAll;
var MergeAllOperator = (function () {
function MergeAllOperator(concurrent) {
this.concurrent = concurrent;
}
MergeAllOperator.prototype.call = function (observer, source) {
return source.subscribe(new MergeAllSubscriber(observer, this.concurrent));
};
return MergeAllOperator;
}());
exports.MergeAllOperator = MergeAllOperator;
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var MergeAllSubscriber = (function (_super) {
__extends(MergeAllSubscriber, _super);
function MergeAllSubscriber(destination, concurrent) {
_super.call(this, destination);
this.concurrent = concurrent;
this.hasCompleted = false;
this.buffer = [];
this.active = 0;
}
MergeAllSubscriber.prototype._next = function (observable) {
if (this.active < this.concurrent) {
this.active++;
this.add(subscribeToResult_1.subscribeToResult(this, observable));
}
else {
this.buffer.push(observable);
}
};
MergeAllSubscriber.prototype._complete = function () {
this.hasCompleted = true;
if (this.active === 0 && this.buffer.length === 0) {
this.destination.complete();
}
};
MergeAllSubscriber.prototype.notifyComplete = function (innerSub) {
var buffer = this.buffer;
this.remove(innerSub);
this.active--;
if (buffer.length > 0) {
this._next(buffer.shift());
}
else if (this.active === 0 && this.hasCompleted) {
this.destination.complete();
}
};
return MergeAllSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
exports.MergeAllSubscriber = MergeAllSubscriber;
//# sourceMappingURL=mergeAll.js.map