public function load(array $configs, ContainerBuilder $container)
    {
        parent::load($configs, $container);

        $configs = $this->processConfiguration(new Configuration(), $configs);

        $sources = $container->hasParameter('graviton.proxy.sources') ?
            $container->getParameter('graviton.proxy.sources') : [];

        $container->setParameter('graviton.proxy.sources', array_merge_recursive($configs['sources'], $sources));
    }