private function processContextInitializers(ContainerBuilder $container)
    {
        $references = $this->processor->findAndSortTaggedServices($container, self::INITIALIZER_TAG);
        $definition = $container->getDefinition(self::FACTORY_ID);

        foreach ($references as $reference) {
            $definition->addMethodCall('registerContextInitializer', array($reference));
        }
    }