Playing with Symfony2 services

Oinm\ServiceBundle\DependencyInjectionImageFilesystemStorageExtension.php

<?php

namespace Oinm\ServiceBundle\DependencyInjection;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;

/**
 * This is the class that loads and manages your bundle configuration
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
 */
class ImageFilesystemStorageExtension extends Extension
{
    /**
     * {@inheritDoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('ImageFilesystemStorage.xml');
    }
    
    public function getAlias()
    {
        return "oinm_imagefilesystemstorage";
    }
}

Oinm\ServiceBundle\Resources\config\ImageFilesystemStorage.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <parameters>
        <parameter key="oinm_imagefilesystemstorage.imagespath">%kernel.root_dir%/../web/images/</parameter>
        <parameter key="oinm_imagestorage.relativebaseurl">images/</parameter>
        <parameter key="oinm_imagestorage.absolutebaseurl"></parameter>
        <parameter key="oinm_imagestorage.useabsoluteurls">false</parameter>
    </parameters>

    <services>
        <service id="oinm_imagefilesystemstorage" class="Oinm\ServiceBundle\Service\Image\ImageFilesystemStorage">
            <argument type="string">%oinm_imagefilesystemstorage.imagespath%</argument>
            <argument type="string">%oinm_imagestorage.relativebaseurl%</argument>
            <argument type="string">%oinm_imagestorage.absolutebaseurl%</argument>
            <argument type="constant">%oinm_imagestorage.useabsoluteurls%</argument>
        </service>
    </services>
</container>