Continuously update status in the buildbot extension popup window

chrome/common/extensions/docs/examples/extensions/buildbot/active_issues.js

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function(){
+
+window.buildbot = window.buildbot || {};
+
+buildbot.ActiveIssues = function() {
+  this.issues_ = {};
+  this.eventCallback_ = null;
+};
+
+buildbot.ActiveIssues.prototype = {
+  forEach: function(callback) {
+    for (var key in this.issues_)
+      callback(this.issues_[key]);
+  },
+
+  getIssue: function(number) {
+    return this.issues_[number];
+  },
+
+  updateIssue: function(issue) {
+    var eventType = this.issues_.hasOwnProperty(issue.issue) ?
+      "issueUpdated" : "issueAdded";
+    this.issues_[issue.issue] = issue;
+    this.postEvent_({event: eventType, issue: issue.issue});
+  },
+
+  removeIssue: function(issue) {
+    delete this.issues_[issue.issue];
+    this.postEvent_({event: "issueRemoved", issue: issue.issue});
+  },
+
+  setEventCallback: function(callback) {
+    this.eventCallback_ = callback;
+  },
+
+  postEvent_: function(obj) {
+    if (this.eventCallback_)
+      this.eventCallback_(obj);
+  }
+};
+
+buildbot.getActiveIssues = function() {
+  var background = chrome.extension.getBackgroundPage();
+  if (!background.buildbot.hasOwnProperty("activeIssues"))
+    background.buildbot.activeIssues = new buildbot.ActiveIssues;
+
+  return background.buildbot.activeIssues;
+};
+
+})();