public static function log($message, array $context = array(), $level = Logger::INFO, $logname = null)
    {
        $_this = self::getInstance();
        if ($_this->getOption('enable_logging')===false) {
            return;
        }
        $default_context = array(
            'url' => $_this->getRequest()->getUrl()
        );
        return self::getInstance()->getLogger()
            ->log($level, $message, array_merge($default_context, $context), $logname);
    }