public function logDebug($message)
    {
        if ( ! Mage::helper('turpentine/varnish')->getVarnishDebugEnabled()) {
            return;
        }

        if (func_num_args() > 1) {
            $message = $this->_prepareLogMessage(func_get_args());
        }

        return $this->_log(Zend_Log::DEBUG, $message);
    }