frontend: topics implementation needs to live in CE edition

Gruntfile.js

@@ -56,6 +56,7 @@ module.exports = function(grunt) {
           '<%= dirs.js.src %>/rhodecode/utils/colorgenerator.js',
           '<%= dirs.js.src %>/rhodecode/utils/ie.js',
           '<%= dirs.js.src %>/rhodecode/utils/os.js',
+          '<%= dirs.js.src %>/rhodecode/utils/topics.js',
 
           // Rhodecode widgets
           '<%= dirs.js.src %>/rhodecode/widgets/multiselect.js',

rhodecode/public/js/src/rhodecode/utils/topics.js

@@ -0,0 +1,50 @@
+// # Copyright (C) 2010-2016  RhodeCode GmbH
+// #
+// # This program is free software: you can redistribute it and/or modify
+// # it under the terms of the GNU Affero General Public License, version 3
+// # (only), as published by the Free Software Foundation.
+// #
+// # This program is distributed in the hope that it will be useful,
+// # but WITHOUT ANY WARRANTY; without even the implied warranty of
+// # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// # GNU General Public License for more details.
+// #
+// # You should have received a copy of the GNU Affero General Public License
+// # along with this program.  If not, see <http://www.gnu.org/licenses/>.
+// #
+// # This program is dual-licensed. If you wish to learn more about the
+// # RhodeCode Enterprise Edition, including its added features, Support services,
+// # and proprietary license terms, please see https://rhodecode.com/licenses/
+
+
+var topics = {};
+jQuery.Topic = function (id) {
+    var callbacks, method,
+        topic = id && topics[id];
+
+    if (!topic) {
+        callbacks = jQuery.Callbacks();
+        topic = {
+            unhandledData: [],
+            publish: callbacks.fire,
+            prepare: function(){
+                for(var i=0; i< arguments.length; i++){
+                    this.unhandledData.push(arguments[i]);
+                }
+            },
+            processPrepared: function(){
+                var data = this.unhandledData;
+                this.unhandledData = [];
+                for(var i=0; i< data.length; i++){
+                    this.publish(data[i]);
+                }
+            },
+            subscribe: callbacks.add,
+            unsubscribe: callbacks.remove
+        };
+        if (id) {
+            topics[id] = topic;
+        }
+    }
+    return topic;
+};