Symfony2 Newsletter Controller

NewsletterController.php

<?php

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Acme\Bundle\NewsletterBundle\Manager\NewsletterManager;

class NewsletterController extends Controller
{
   /**
    * @Route("/newsletter/subscribe/{emailAddress}", name="subscribe")
    */
   public function subscribeAction($emailAddress)
   {
       $responseMessage = 'failed';
       if ($emailAddress) {
           $success = $this->getNewsletterManager()->subscribe($emailAddress);

           if ($success) {
               $responseMessage = 'Added ' . $emailAddress . ' to newsletter';
           }
       }

       return new Response($responseMessage);
   }

   /**
    * @Route("/newsletter/unsubscribe/{emailAddress}", name="unsubscribe")
    */
   public function unsubscribeAction($emailAddress)
   {
       $responseMessage = 'failed';
       if ($emailAddress) {
           $success = $this->getNewsletterManager()->unsubscribe($emailAddress);

           if ($success) {
               $responseMessage = 'Unsubscribed ' . $emailAddress . ' from newsletter';
           }
       }

       return new Response($responseMessage);
   }

   /**
    * @Route("/newsletter/send", name="send")
    */
   public function sendAction(Request $request)
   {
       $subject = $request->get('subject');
       $message = $request->get('message');

       $responseMessage = 'failed';
       if ($subject && $message) {
           $this->getNewsletterManager()->sendNewsletter($subject, $message);
           $responseMessage = 'done';
       }

       return new Response($responseMessage);
   }

   /**
    * Get newsletter manager from container
    *
    * @return NewsletterManager
    */
   private function getNewsletterManager()
   {
       return $this->get('acme_newsletter.newsletter_manager');
   }
}