symfony/src/Symfony/Bundle/FrameworkBundle/Kernel/MicroKernelTrait.php

<?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\Bundle\FrameworkBundle\Kernel;

use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Routing\RouteCollectionBuilder;

/**
 * A Kernel that provides configuration hooks.
 *
 * @author Ryan Weaver <ryan@knpuniversity.com>
 * @author Fabien Potencier <fabien@symfony.com>
 */
trait MicroKernelTrait
{
    /**
     * Add or import routes into your application.
     *
     *     $routes->import('config/routing.yml');
     *     $routes->add('/admin', 'App\Controller\AdminController::dashboard', 'admin_dashboard');
     *
     * @param RouteCollectionBuilder $routes
     */
    abstract protected function configureRoutes(RouteCollectionBuilder $routes);

    /**
     * Configures the container.
     *
     * You can register extensions:
     *
     *     $c->loadFromExtension('framework', array(
     *         'secret' => '%secret%'
     *     ));
     *
     * Or services:
     *
     *     $c->register('halloween', 'FooBundle\HalloweenProvider');
     *
     * Or parameters:
     *
     *     $c->setParameter('halloween', 'lot of fun');
     *
     * @param ContainerBuilder $c
     * @param LoaderInterface  $loader
     */
    abstract protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader);

    /**
     * {@inheritdoc}
     */
    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load(function (ContainerBuilder $container) use ($loader) {
            $container->loadFromExtension('framework', array(
                'router' => array(
                    'resource' => 'kernel::loadRoutes',
                    'type' => 'service',
                ),
            ));

            if ($this instanceof EventSubscriberInterface) {
                $container->register('kernel', static::class)
                    ->setSynthetic(true)
                    ->setPublic(true)
                    ->addTag('kernel.event_subscriber')
                ;
            }

            $this->configureContainer($container, $loader);

            $container->addObjectResource($this);
        });
    }

    /**
     * @internal
     */
    public function loadRoutes(LoaderInterface $loader)
    {
        $routes = new RouteCollectionBuilder($loader);
        $this->configureRoutes($routes);

        return $routes->build();
    }
}