问组件注入到symfony 3会话

EN

$session = $this->container->get('session');

<?php
namespace AppBundle\Components;

use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBagInterface;
use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;

class MDSession extends Session {

private $domain     =   null;

private $mandant    =   null;

const DEFAULT_THEME = '_default';



    public function __construct(SessionStorageInterface $storage = null,AttributeBagInterface $attributes = null,FlashBagInterface $flashes = null)
    {
        parent::__construct($storage, $attributes, $flashes);

        $this->getDomain();

        /**
         * check if session is set and the same requested domain given
         */
        if(!$this->_get('domain') || $this->_get('domain') != $this->domain)
        {

            $this->mandant = $this->getMandant();

            /**
             * set session here
             */
            $this->_set('domain',   $this->domain);
            $this->_set('mandant',  $this->mandant['id']);
            $this->_set('theme',    $this->mandant['theme']);
        }
    }

    public function _set($name=null,$value=null)
    {
        parent::set($name,$value);
    }

    public function _get($name)
    {
        parent::get($name);
    }


    /**
     * HostnameLookups must be set to On in Apache
     */
    private function getDomain()
    {
        $this->domain = strtolower($_SERVER["HTTP_HOST"]);
    }

    private function getMandant()
    {
         /**
         * do something here
         */
    }
}