code: public function log( $message, $severity = self::INFO )
      {
          $log = \ezcLog::getInstance();
          $log->log( $message, $this->severityMapping[$severity] );
      }
docs: Log message
  
  Log a message, while the message must be convertable into a string.
  Optionally a log message severity can be specified.
  
  @param string $message
  @param int $severity
  @return void