protected function initializeBackend($app) { $init = new BackendInit($this->container->get('kernel')); $init->initialize($app); switch ($app) { case 'BackendAjax': $applicationClass = 'Backend\\Core\\Engine\\Ajax'; break; case 'BackendCronjob': $applicationClass = 'Backend\\Core\\Engine\\Cronjob'; break; default: $applicationClass = 'Backend\\Core\\Engine\\Backend'; } return $applicationClass; }