public function getPrefix()
    {
        if (is_null($this->_prefix)) {
            $hostName = gethostname();
            try {
                $this->_prefix = Configuration::get('config')
                    ->get('logger.prefix', $hostName);
            } catch(FileNotFoundException $exp) {
                $this->_prefix = $hostName;
            }

        }
        return $this->_prefix;
    }