[HttpKernel] Add Kernel::terminate() and HttpKernel::terminate() for post-response logic

src/Symfony/Component/HttpKernel/Event/PostResponseEvent.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Event;
+
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Allows to execute logic after a response was sent
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+class PostResponseEvent extends Event
+{
+    /**
+     * The kernel in which this event was thrown
+     * @var Symfony\Component\HttpKernel\HttpKernelInterface
+     */
+    private $kernel;
+
+    public function __construct(HttpKernelInterface $kernel)
+    {
+        $this->kernel = $kernel;
+    }
+
+    /**
+     * Returns the kernel in which this event was thrown
+     *
+     * @return Symfony\Component\HttpKernel\HttpKernelInterface
+     */
+    public function getKernel()
+    {
+        return $this->kernel;
+    }
+}

src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php

@@ -215,6 +215,18 @@ class HttpCache implements HttpKernelInterface
         return $response;
     }
 
+    /**
+     * Terminates a request/response cycle
+     *
+     * Should be called before shutdown, but after sending the response
+     *
+     * @api
+     */
+    public function terminate()
+    {
+        $this->kernel->terminate();
+    }
+
     /**
      * Forwards the Request to the backend without storing the Response in the cache.
      *

src/Symfony/Component/HttpKernel/HttpKernel.php

@@ -18,6 +18,7 @@ use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Event\PostResponseEvent;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -78,6 +79,19 @@ class HttpKernel implements HttpKernelInterface
         }
     }
 
+    /**
+     * Terminates a request/response cycle
+     *
+     * Should be called before shutdown, but after sending the response
+     *
+     * @api
+     */
+    public function terminate()
+    {
+        $event = new PostResponseEvent($this);
+        $this->dispatcher->dispatch(KernelEvents::TERMINATE, $event);
+    }
+
     /**
      * Handles a request to convert it to a response.
      *

src/Symfony/Component/HttpKernel/HttpKernelInterface.php

@@ -44,4 +44,11 @@ interface HttpKernelInterface
      * @api
      */
     function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true);
+
+    /**
+     * Terminates a request/response cycle
+     *
+     * Should be called after sending the response
+     */
+    function terminate();
 }

src/Symfony/Component/HttpKernel/Kernel.php

@@ -171,6 +171,22 @@ abstract class Kernel implements KernelInterface
         return $this->getHttpKernel()->handle($request, $type, $catch);
     }
 
+    /**
+     * Terminates a request/response cycle
+     *
+     * Should be called before shutdown, but after sending the response
+     *
+     * @api
+     */
+    public function terminate()
+    {
+        if (false === $this->booted) {
+            throw new \LogicException('The kernel has been shutdown already');
+        }
+
+        $this->getHttpKernel()->terminate();
+    }
+
     /**
      * Gets a http kernel from the container
      *

src/Symfony/Component/HttpKernel/KernelEvents.php

@@ -91,4 +91,15 @@ final class KernelEvents
      * @api
      */
     const RESPONSE = 'kernel.response';
+
+    /**
+     * The TERMINATE event occurs once a reponse was sent
+     *
+     * This event allows you to run expensive post-response jobs.
+     * The event listener method receives a
+     * Symfony\Component\HttpKernel\Event\PostResponseEvent instance.
+     *
+     * @var string
+     */
+    const TERMINATE = 'kernel.terminate';
 }

tests/Symfony/Tests/Component/HttpKernel/EventListener/ExceptionListenerTest.php

@@ -114,6 +114,7 @@ class TestKernel implements HttpKernelInterface
         return new Response('foo');
     }
 
+    public function terminate() {}
 }
 
 class TestKernelThatThrowsException implements HttpKernelInterface
@@ -122,4 +123,6 @@ class TestKernelThatThrowsException implements HttpKernelInterface
     {
         throw new \Exception('bar');
     }
+
+    public function terminate() {}
 }

tests/Symfony/Tests/Component/HttpKernel/HttpKernelTest.php

@@ -164,6 +164,20 @@ class HttpKernelTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('foo', $kernel->handle(new Request())->getContent());
     }
 
+    public function testTerminate()
+    {
+        $dispatcher = new EventDispatcher();
+        $kernel = new HttpKernel($dispatcher, $this->getResolver());
+        $dispatcher->addListener(KernelEvents::TERMINATE, function ($event) use (&$called, &$capturedKernel) {
+            $called = true;
+            $capturedKernel = $event->getKernel();
+        });
+
+        $kernel->terminate();
+        $this->assertTrue($called);
+        $this->assertEquals($kernel, $capturedKernel);
+    }
+
     protected function getResolver($controller = null)
     {
         if (null === $controller) {