function loader($loaderName)
    {
        $loaderName = $this->_normalizeLoaderName($loaderName);

        if (!$this->hasAttached($loaderName))
            throw new \Exception(sprintf(
                'Loader with name (%s) has not attached.'
                , $loaderName
            ));

        return $this->_t_loader_aggregate_Names[$loaderName];
    }