code: public function update(SubjectInterface $subject, $arguments = null)
  	{
  		// Check instance
  		if (!$arguments instanceof LogRecord) {
  			return;
  		}
  
  		// Create file
  		$file = new File($this->path . DIRECTORY_SEPARATOR . strtolower($arguments->getLevel()) . static::DEFAULT_EXTENSION);
  
  		// Append message
  		$file->append((new \DateTime())->format('Y-m-d H:i:s') . ' - ' . $arguments->getMessage() . PHP_EOL);
  	}
docs: {@inheritdoc}