SimpleChat Using JQuery / Symfony2

MainController.php

<?php

namespace CSG\SimpleChatBundle\Controller;


use Symfony\Component\Form\FormFactory;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
use Doctrine\ORM\EntityManager;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\DependencyInjection\ContainerAware;


use Symfony\Component\HttpFoundation\Response;

use CSG\SimpleChatBundle\Entity\Message;
use CSG\SimpleChatBundle\Form\SimpleChatFormType;



class MainController extends ContainerAware
{
	protected $request;
	protected $router;
	protected $templating;	
	protected $entity_manager;
	protected $form_factory;
	protected $http_kernel;
	
	public function __construct(Request $request, UrlGeneratorInterface $router,
		 EngineInterface $templating, EntityManager $entity_manager, FormFactory $form_factory)
	{		
		$this->templating = $templating;		
		$this->request = $request;
		$this->router = $router;
		$this->entity_manager = $entity_manager;
		$this->form_factory = $form_factory;		
	}
	
    public function indexAction()
    {
    	$form = $this->form_factory->create('CSG\SimpleChatBundle\Form\SimpleChatFormType');
                
        return $this->templating->renderResponse('CSGSimpleChatBundle:Main:index.html.twig',
        	array('form' => $form->getRenderer()));        
    }
    
    public function createMessage()
    {    	
    	$httpKernel = $this->container->get('http_kernel');
    	
    	$msg = new Message();
    	$msg->setTimestamp(0);
    	
    	$form = $this->form_factory->create('CSG\SimpleChatBundle\Form\SimpleChatFormType');
    	$form->setData($msg); 	

        if ($this->request->getMethod() === 'POST') {
            $form->bindRequest($this->request);

            if ($form->isValid()) {            	
                $this->entity_manager->persist($msg);
                $this->entity_manager->flush();               
                
			//	return $httpKernel->forward('simplechat.main.controller:updateMessage', array(
				//	'timestamp' => 0));                                   
            }           
            
        }
        
       $response =  $httpKernel->forward('simplechat.main.controller:updateMessage', array(
       			'timestamp'  => 0));
       //$response->headers->set('Content-Type', 'application/json-rpc'); NO SENSE ANY WAY TO   FORWARD  XHR?

       return $response;

        //return new RedirectResponse($this->router->generate('simple_chat'));           	
    }
    
    /**
     * Retrieve message from database and generate xml response
     */
    
    public function updateMessage($timestamp  = 0)
    {    	
    	$messages = $this->entity_manager->createQuery('SELECT m FROM CSGSimpleChatBundle:Message m
    		WHERE m.timestamp >= :time ORDER BY m.id ASC')
    		->setParameter('time',$timestamp)
    		->setMaxResults(20)
    		->getResult();
    		
    	if (!$messages) {
        	throw new NotFoundHttpException('The messages does not exist.');
    	}
    	
    	$status_code = 1;

		$xml = "<?xml version=\"1.0\"?>\n";  
		$xml .= "<response>\n";
		$xml .= "\t<status>".$status_code."</status>\n";
		$xml .= "\t<time>".$timestamp."</time>\n";
		foreach ($messages as $msg) 
		{
			$xml .= "\t<message>\n";
			$xml .= "\t\t<author>".$msg->getUser()."</author>\n";  
 			$xml .= "\t\t<text>".$msg->getMsg()."</text>\n";
 			$xml .= "\t</message>\n";		
		}
		$xml .= "</response>\n";
    	
    	if ($this->request->isXmlHttpRequest())
    	{
    		//return new Response("HELLO AJAX FrOM UPDATE");
    		return new Response($xml);    		
    	}
    	
    	return new Response($xml);
    
    }
}