public function addManager(ManagerInterface $manager, ManagerNodeInterface $configuration)
    {

        // bind the manager callback to the naming directory => the application itself
        $this->getNamingDirectory()->bind(sprintf('php:global/%s/%s', $this->getUniqueName(), $configuration->getName()), array(&$this, 'getManager'), array($configuration->getName()));

        // add the manager instance to the application
        $this->managers[$configuration->getName()] = $manager;
    }