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99 lines
3.6 KiB
JavaScript
99 lines
3.6 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2018, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global spyOn*/
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define(
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function () {
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/**
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* An instrumented promise implementation for better control of promises
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* during tests.
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*
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*/
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function ControlledPromise() {
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this.resolveHandlers = [];
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this.rejectHandlers = [];
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spyOn(this, 'then').andCallThrough();
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}
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/**
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* Resolve the promise, passing the supplied value to all resolve
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* handlers.
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*/
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ControlledPromise.prototype.resolve = function (value) {
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this.resolveHandlers.forEach(function (handler) {
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handler(value);
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});
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};
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/**
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* Reject the promise, passing the supplied value to all rejection
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* handlers.
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*/
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ControlledPromise.prototype.reject = function (value) {
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this.rejectHandlers.forEach(function (handler) {
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handler(value);
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});
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};
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/**
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* Standard promise.then, returns a promise that support chaining.
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* TODO: Need to support resolve/reject handlers that return promises.
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*/
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ControlledPromise.prototype.then = function (onResolve, onReject) {
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var returnPromise = new ControlledPromise();
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if (onResolve) {
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this.resolveHandlers.push(function (resolveWith) {
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var chainResult = onResolve(resolveWith);
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if (chainResult && chainResult.then) {
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// chainResult is a promise, resolve when it resolves.
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chainResult.then(function (pipedResult) {
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return returnPromise.resolve(pipedResult);
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});
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} else {
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returnPromise.resolve(chainResult);
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}
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});
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}
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if (onReject) {
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this.rejectHandlers.push(function (rejectWith) {
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var chainResult = onReject(rejectWith);
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if (chainResult && chainResult.then) {
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chainResult.then(function (pipedResult) {
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returnPromise.reject(pipedResult);
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});
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} else {
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returnPromise.reject(chainResult);
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}
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});
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}
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return returnPromise;
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};
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return ControlledPromise;
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}
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);
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