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[READ-ONLY] Subtree split of the Symfony HttpKernel Component -- clone into Symfony/Component/ (master at symfony/symfony)
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Bundle
CacheWarmer
Config
Controller
DataCollector
Debug
DependencyInjection
Event
EventListener
Exception
HttpCache
Log
Profiler
Util
Client.php
HttpKernel.php
HttpKernelInterface.php
Kernel.php
KernelEvents.php
KernelInterface.php
LICENSE
README.md
composer.json

README.md

HttpKernel Component

HttpKernel provides the building blocks to create flexible and fast HTTP-based frameworks.

HttpKernelInterface is the core interface of the Symfony2 full-stack framework:

interface HttpKernelInterface
{
    /**
     * Handles a Request to convert it to a Response.
     *
     * @param  Request $request A Request instance
     *
     * @return Response A Response instance
     */
    function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true);
}

It takes a Request as an input and should return a Response as an output. Using this interface makes your code compatible with all frameworks using the Symfony2 components. And this will gives you many cool features for free.

Creating a framework based on the Symfony2 components is really easy. Here is a very simple, but fully-featured framework based on the Symfony2 components:

$routes = new RouteCollection();
$routes->add('hello', new Route('/hello', array('_controller' =>
    function (Request $request) {
        return new Response(sprintf("Hello %s", $request->get('name')));
    }
)));

$request = Request::createFromGlobals();

$context = new RequestContext();
$context->fromRequest($request);

$matcher = new UrlMatcher($routes, $context);

$dispatcher = new EventDispatcher();
$dispatcher->addSubscriber(new RouterListener($matcher));

$resolver = new ControllerResolver();

$kernel = new HttpKernel($dispatcher, $resolver);

$kernel->handle($request)->send();

This is all you need to create a flexible framework with the Symfony2 components.

Want to add an HTTP reverse proxy and benefit from HTTP caching and Edge Side Includes?

$kernel = new HttpKernel($dispatcher, $resolver);

$kernel = new HttpCache($kernel, new Store(__DIR__.'/cache'));

Want to functional test this small framework?

$client = new Client($kernel);
$crawler = $client->request('GET', '/hello/Fabien');

$this->assertEquals('Fabien', $crawler->filter('p > span')->text());

Want nice error pages instead of ugly PHP exceptions?

$dispatcher->addSubscriber(new ExceptionListener(function (Request $request) {
    $msg = 'Something went wrong! ('.$request->get('exception')->getMessage().')';

    return new Response($msg, 500);
}));

And that's why the simple looking HttpKernelInterface is so powerful. It gives you access to a lot of cool features, ready to be used out of the box, with no efforts.

Resources

Unit tests:

https://github.com/symfony/symfony/tree/master/tests/Symfony/Tests/Component/HttpKernel

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