code: protected function log($message, $priority = Logger::DEBUG, array $extra = [])
  	{
  		if ($this->getLogger() === null)
  		{
  			return $this;
  		}
  
  		$this->getLogger()->log($priority, $message, $extra);
  
  		return $this;
  	}
docs: logs a message
  
  @param string $message
  @param string $priority
  @param array $extra
  @return self