Inheritance: extends yii\base\Component
 /**
  * Run the given event.
  *
  * @param Application $app
  * @return mixed
  */
 public function run(Application $app)
 {
     $response = call_user_func_array($this->callback, array_merge($this->parameters, [$app]));
     parent::callAfterCallbacks($app);
     return $response;
 }