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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";
const promise = require("promise");
/**
* Map of pending requests. Used mainly by tests to wait
* till things are ready.
*/
var promises = new Map();
/**
* This object is used to fetch network data from the backend.
* Communication with the chrome scope is based on message
* exchange.
*/
var DataProvider = {
hasPendingRequests: function () {
return promises.size > 0;
},
requestData: function (client, actor, method) {
let key = actor + ":" + method;
let p = promises.get(key);
if (p) {
return p;
}
let deferred = promise.defer();
let realMethodName = "get" + method.charAt(0).toUpperCase() +
method.slice(1);
if (!client[realMethodName]) {
return null;
}
client[realMethodName](actor, response => {
promises.delete(key);
deferred.resolve(response);
});
promises.set(key, deferred.promise);
return deferred.promise;
},
resolveString: function (client, stringGrip) {
let key = stringGrip.actor + ":getString";
let p = promises.get(key);
if (p) {
return p;
}
p = client.getString(stringGrip).then(result => {
promises.delete(key);
return result;
});
promises.set(key, p);
return p;
},
};
// Exports from this module
module.exports = DataProvider;
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