AngularJs y detección de conexión para cambiar sistema de almacenamiento

gistfile1.js

angular.module('myApp').run(function($rootScope) {
  window.addEventListener("online", function () {
    $rootScope.$broadcast('onlineChanged', true);
  }, true);

  window.addEventListener("offline", function () {
    $rootScope.$broadcast('onlineChanged', false);
  }, true);
});

angular.module('myApp').factory('storage', function($rootScope, $http, LocalStorage) {
  var currentStorage;
  $rootScope.$on('onlineChanged', function(evt, isOnline) {
    if( isOnline ){
      synchronizeLocalStorageWithServer();
      currentStorage = $http;
    } else {
      currentStorage = LocalStorage;
    }
  });
});​