Session is Empty in Ratchet & Memcached
<br>
I'm using symfony2 and ratchet <br>
I am working in a  real time app using Ratchet Library,<br> In my app I need to send some data to a specific user.<br>
And the only way to do this is to attach a symfony session object to each incoming Connection object.
<br> I have read the doc [here](http://socketo.me/docs/sessions) but I can't understand it and how to make it work in symfony?

my server code : 

```
<?php
use Ratchet\Session\SessionProvider;
use Symfony\Component\HttpFoundation\Session\Storage\Handler;
    require dirname(__DIR__) . '/../../../vendor/autoload.php';

    $loop   =  \React\EventLoop\Factory::create();
    $pusher = new my\Bundle\Controller\PusherController;

    $memcached = new Memcached;
    $memcached->addServer('127.0.0.1', 11211);

    // Listen for the web server to make a ZeroMQ push after an ajax request
    $context = new React\ZMQ\Context($loop);
    $pull = $context->getSocket(ZMQ::SOCKET_PULL);
    $pull->bind('tcp://127.0.0.1:5555'); // Binding to 127.0.0.1 means the only client that can connect is itself
    $pull->on('message', array($pusher, 'onNotified'));

    // Set up our WebSocket server for clients wanting real-time updates
    $webSock = new React\Socket\Server($loop);
    $webSock->listen(8080, 'neargood.com'); // Binding to 0.0.0.0 means remotes can connect
    $webServer = new \Ratchet\Server\IoServer(
            new \Ratchet\WebSocket\WsServer(
                new SessionProvider(
                             new \Ratchet\Wamp\WampServer(
                            $pusher
                                )
                            , new Handler\MemcachedSessionHandler($memcached)
                        )
            ),
            $webSock
        );

    $loop->run();
```

Then in my pusher , I have 

```
public function onSubscribe(ConnectionInterface $conn,$topic) {
var_dump($conn->Session->get('userId')); //returns NULL
    echo'connected';
}
```

the session is empty .. 
When I try the official code , it says Ratchet\App is not found
