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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict"
+
+this.EXPORTED_SYMBOLS = ["PromiseUtils"];
+
+Components.utils.import("resource://gre/modules/Timer.jsm");
+
+this.PromiseUtils = {
+ /*
+ * Creates a new pending Promise and provide methods to resolve and reject this Promise.
+ *
+ * @return {Deferred} an object consisting of a pending Promise "promise"
+ * and methods "resolve" and "reject" to change its state.
+ */
+ defer : function() {
+ return new Deferred();
+ },
+}
+
+/**
+ * The definition of Deferred object which is returned by PromiseUtils.defer(),
+ * It contains a Promise and methods to resolve/reject it.
+ */
+function Deferred() {
+ /* A method to resolve the associated Promise with the value passed.
+ * If the promise is already settled it does nothing.
+ *
+ * @param {anything} value : This value is used to resolve the promise
+ * If the value is a Promise then the associated promise assumes the state
+ * of Promise passed as value.
+ */
+ this.resolve = null;
+
+ /* A method to reject the assocaited Promise with the value passed.
+ * If the promise is already settled it does nothing.
+ *
+ * @param {anything} reason: The reason for the rejection of the Promise.
+ * Generally its an Error object. If however a Promise is passed, then the Promise
+ * itself will be the reason for rejection no matter the state of the Promise.
+ */
+ this.reject = null;
+
+ /* A newly created Pomise object.
+ * Initially in pending state.
+ */
+ this.promise = new Promise((resolve, reject) => {
+ this.resolve = resolve;
+ this.reject = reject;
+ });
+}