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diff --git a/Http/Firewall.php b/Http/Firewall.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Security\Http;
+
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventInterface;
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Firewall uses a FirewallMap to register security listeners for the given
+ * request.
+ *
+ * It allows for different security strategies within the same application
+ * (a Basic authentication for the /api, and a web based authentication for
+ * everything else for instance).
+ *
+ * The handle method must be connected to the core.request event.
+ *
+ * @author Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Firewall
+{
+    protected $map;
+    protected $dispatcher;
+    protected $currentListeners;
+
+    /**
+     * Constructor.
+     *
+     * @param FirewallMap $map A FirewallMap instance
+     */
+    public function __construct(FirewallMapInterface $map, EventDispatcherInterface $dispatcher)
+    {
+        $this->map = $map;
+        $this->dispatcher = $dispatcher;
+        $this->currentListeners = array();
+    }
+
+    /**
+     * Handles security.
+     *
+     * @param EventInterface $event An EventInterface instance
+     */
+    public function handle(EventInterface $event)
+    {
+        if (HttpKernelInterface::MASTER_REQUEST !== $event->get('request_type')) {
+            return;
+        }
+
+        $request = $event->get('request');
+
+        // disconnect all listeners from core.security to avoid the overhead
+        // of most listeners having to do this manually
+        $this->dispatcher->disconnect('core.security');
+
+        // ensure that listeners disconnect from wherever they have connected to
+        foreach ($this->currentListeners as $listener) {
+            $listener->unregister($this->dispatcher);
+        }
+
+        // register listeners for this firewall
+        list($listeners, $exception) = $this->map->getListeners($request);
+        if (null !== $exception) {
+            $exception->register($this->dispatcher);
+        }
+        foreach ($listeners as $listener) {
+            $listener->register($this->dispatcher);
+        }
+
+        // save current listener instances
+        $this->currentListeners = $listeners;
+        if (null !== $exception) {
+            $this->currentListeners[] = $exception;
+        }
+
+        // initiate the listener chain
+        $ret = $this->dispatcher->notifyUntil($event = new Event($request, 'core.security', array('request' => $request)));
+        if ($event->isProcessed()) {
+            $event->setProcessed();
+
+            return $ret;
+        }
+    }
+}