Sf2 custom annotation

AllowedUser.php

<?php
namespace AppBundle\Annotations;

/**
 * @Annotation
 */
class AllowedUser
{
    public $group;
}

AnnotationDriver.php

<?php
namespace AppBundle\Annotations\Driver;

use Symfony\Component\HttpKernel\Event\FilterControllerEvent;

class AnnotationDriver
{
    /**
     * @var \Doctrine\Common\Annotations\Reader
     */
    private $reader;

    public function __construct($reader)
    {
        $this->reader = $reader;
    }

    public function onKernelController(FilterControllerEvent $event)
    {
        //Skip controllers of anonymous function (closure) type.
        if (!is_array($currentController = $event->getController())) {
            return;
        }

        $customAnnotationClass = 'AppBundle\Annotations\AllowedUser';
        list($currentControllerInstance, $currentMethodName) = $currentController;

        $object = new \ReflectionObject($currentControllerInstance);
        $method = $object->getMethod($currentMethodName);

        $annotation = $this->reader->getMethodAnnotation($method, $customAnnotationClass);

        if(!is_null($annotation)) {
            $group = $annotation->group;
            /*
             * $group = ['group' => 'managers']
             */
        }
    }
}

MyController.php

<?php

namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use AppBundle\Annotations\AllowedUser;

class MyController extends Controller
{
    /**
     * @AllowedUser(group="managers")
     */
    public function promoteStaffAction()
    {
      //...  
    }

services.yml

services:
    app_bundle_annotation_driver:
        class: AppBundle\Annotations\Driver\AnnotationDriver
        tags:
            - {name: kernel.event_listener, event: kernel.controller, method: onKernelController}
        arguments: [@annotation_reader]