114 lines
4.5 KiB
JavaScript
114 lines
4.5 KiB
JavaScript
"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var subscribeToResult_1 = require('../util/subscribeToResult');
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var OuterSubscriber_1 = require('../OuterSubscriber');
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/**
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* Returns an Observable that emits items based on applying a function that you supply to each item emitted by the
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* source Observable, where that function returns an Observable, and then merging those resulting Observables and
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* emitting the results of this merger.
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*
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* <img src="./img/mergeMap.png" width="100%">
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*
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* @param {Function} a function that, when applied to an item emitted by the source Observable, returns an Observable.
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* @returns {Observable} an Observable that emits the result of applying the transformation function to each item
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* emitted by the source Observable and merging the results of the Observables obtained from this transformation
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*/
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function mergeMap(project, resultSelector, concurrent) {
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if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
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return this.lift(new MergeMapOperator(project, resultSelector, concurrent));
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}
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exports.mergeMap = mergeMap;
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var MergeMapOperator = (function () {
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function MergeMapOperator(project, resultSelector, concurrent) {
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if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
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this.project = project;
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this.resultSelector = resultSelector;
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this.concurrent = concurrent;
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}
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MergeMapOperator.prototype.call = function (observer) {
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return new MergeMapSubscriber(observer, this.project, this.resultSelector, this.concurrent);
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};
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return MergeMapOperator;
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}());
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exports.MergeMapOperator = MergeMapOperator;
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var MergeMapSubscriber = (function (_super) {
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__extends(MergeMapSubscriber, _super);
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function MergeMapSubscriber(destination, project, resultSelector, concurrent) {
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if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
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_super.call(this, destination);
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this.project = project;
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this.resultSelector = resultSelector;
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this.concurrent = concurrent;
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this.hasCompleted = false;
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this.buffer = [];
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this.active = 0;
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this.index = 0;
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}
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MergeMapSubscriber.prototype._next = function (value) {
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if (this.active < this.concurrent) {
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this._tryNext(value);
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}
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else {
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this.buffer.push(value);
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}
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};
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MergeMapSubscriber.prototype._tryNext = function (value) {
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var result;
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var index = this.index++;
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try {
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result = this.project(value, index);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.active++;
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this._innerSub(result, value, index);
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};
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MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {
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this.add(subscribeToResult_1.subscribeToResult(this, ish, value, index));
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};
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MergeMapSubscriber.prototype._complete = function () {
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this.hasCompleted = true;
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if (this.active === 0 && this.buffer.length === 0) {
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this.destination.complete();
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}
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};
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MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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if (this.resultSelector) {
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this._notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex);
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}
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else {
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this.destination.next(innerValue);
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}
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};
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MergeMapSubscriber.prototype._notifyResultSelector = function (outerValue, innerValue, outerIndex, innerIndex) {
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var result;
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try {
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result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.destination.next(result);
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};
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MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {
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var buffer = this.buffer;
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this.remove(innerSub);
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this.active--;
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if (buffer.length > 0) {
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this._next(buffer.shift());
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}
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else if (this.active === 0 && this.hasCompleted) {
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this.destination.complete();
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}
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};
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return MergeMapSubscriber;
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}(OuterSubscriber_1.OuterSubscriber));
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exports.MergeMapSubscriber = MergeMapSubscriber;
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//# sourceMappingURL=mergeMap.js.map
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