зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
1.5 KiB
JavaScript
67 строки
1.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const promise = require("promise");
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/**
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* Map of pending requests. Used mainly by tests to wait
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* till things are ready.
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*/
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var promises = new Map();
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/**
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* This object is used to fetch network data from the backend.
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* Communication with the chrome scope is based on message
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* exchange.
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*/
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var DataProvider = {
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hasPendingRequests: function () {
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return promises.size > 0;
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},
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requestData: function (client, actor, method) {
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let key = actor + ":" + method;
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let p = promises.get(key);
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if (p) {
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return p;
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}
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let deferred = promise.defer();
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let realMethodName = "get" + method.charAt(0).toUpperCase() +
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method.slice(1);
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if (!client[realMethodName]) {
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return null;
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}
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client[realMethodName](actor, response => {
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promises.delete(key);
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deferred.resolve(response);
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});
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promises.set(key, deferred.promise);
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return deferred.promise;
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},
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resolveString: function (client, stringGrip) {
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let key = stringGrip.actor + ":getString";
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let p = promises.get(key);
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if (p) {
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return p;
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}
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p = client.getString(stringGrip).then(result => {
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promises.delete(key);
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return result;
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});
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promises.set(key, p);
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return p;
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},
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};
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// Exports from this module
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module.exports = DataProvider;
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