diff -r 000000000000 -r 6474c204b198 browser/devtools/app-manager/connection-store.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/app-manager/connection-store.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* 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/. */
+
+const ObservableObject = require("devtools/shared/observable-object");
+const {Connection} = require("devtools/client/connection-manager");
+
+const _knownConnectionStores = new WeakMap();
+
+let ConnectionStore;
+
+module.exports = ConnectionStore = function(connection) {
+  // If we already know about this connection,
+  // let's re-use the existing store.
+  if (_knownConnectionStores.has(connection)) {
+    return _knownConnectionStores.get(connection);
+  }
+  _knownConnectionStores.set(connection, this);
+
+  ObservableObject.call(this, {status:null,host:null,port:null});
+
+  this.destroy = this.destroy.bind(this);
+  this._feedStore = this._feedStore.bind(this);
+
+  this._connection = connection;
+  this._connection.once(Connection.Events.DESTROYED, this.destroy);
+  this._connection.on(Connection.Events.STATUS_CHANGED, this._feedStore);
+  this._connection.on(Connection.Events.PORT_CHANGED, this._feedStore);
+  this._connection.on(Connection.Events.HOST_CHANGED, this._feedStore);
+  this._feedStore();
+  return this;
+}
+
+ConnectionStore.prototype = {
+  destroy: function() {
+    if (this._connection) {
+      // While this.destroy is bound using .once() above, that event may not
+      // have occurred when the ConnectionStore client calls destroy, so we
+      // manually remove it here.
+      this._connection.off(Connection.Events.DESTROYED, this.destroy);
+      this._connection.off(Connection.Events.STATUS_CHANGED, this._feedStore);
+      this._connection.off(Connection.Events.PORT_CHANGED, this._feedStore);
+      this._connection.off(Connection.Events.HOST_CHANGED, this._feedStore);
+      _knownConnectionStores.delete(this._connection);
+      this._connection = null;
+    }
+  },
+
+  _feedStore: function() {
+    this.object.status = this._connection.status;
+    this.object.host = this._connection.host;
+    this.object.port = this._connection.port;
+  }
+}