app.controller('Ctrl1', function($scope, DataFactory) {
  // bind the controller property to the service collection
  this.items = DataFactory.items;
  
  // watch the collection for changes
  $scope.$watch(watchSource, function(current, previous){
    this.items = current;
  });
  
  function watchSource(){
    return DataFactory.items;
  }  
});

app.factory('DataFactory', function($q, $timeout) {
  var svc = {};
  svc.items = [];

  svc.getDataStream = function() {
    
    var fakeData = [
      { id: 1, name: 'name 1' },
      { id: 2, name: 'name 2' },
      { id: 4, name: 'name 4' }
    ];
    
    // using $q to fake async data grab
    return $q.when(fakeData)
      .then(function(data) {
        svc.items = data;
      });
  };

  return svc;
});