DrupalContainer.php

<?php

namespace Drupal\Core;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\EventDispatcher\Event;

class DrupalContainer extends ContainerBuilder {
  public function __construct(ParameterBagInterface $parameterBag = null) {
    parent::__construct($parameterBag);
    $this->register('context', 'Symfony\Component\Routing\RequestContext')
      ->addMethodCall('fromRequest', array(new Reference($this->parameterBag->get('request'))));
    $this->register('matcher', 'Drupal\Core\UrlMatcher;')
      ->setArguments(array(new Reference('context')));
    $this->register('resolver', 'Symfony\Component\HttpKernel\Controller\ControllerResolver');
    $this->register('controller', new Reference('resolver'))
      ->addMethodCall('getController', array(new Reference($this->parameterBag->get('request'))));
    $this->register('arguments', new Reference('resolver'))
      ->addMethodCall('getArguments', array(new Reference($this->parameterBag->get('request')), new Reference('controller')));
    $this->register('dispatcher', 'Symfony\Component\EventDispatcher\EventDispatcher')
      ->addMethodCall('addListener', array(
        KernelEvents::VIEW,
        function(Event $event) {
          $page_callback_result = $event->getControllerResult();
          $event->setResponse(new Response(drupal_render_page($page_callback_result)));
        }
      ));
    $this->register('kernel', 'Symfony\Component\HttpKernel\HttpKernel')
      ->setArguments(array(new Reference('dispatcher'), new Reference('resolver')))
      ->addMethodCall('handle', array(new Reference($this->parameterBag->get('request'))));
  }
}