code: private List<NamedFactory<org.apache.sshd.server.Command>> getSubsystems() {
  
  		final List<NamedFactory<org.apache.sshd.server.Command>> list = new LinkedList<>();
  
  		// sftp
  		final SftpSubsystemFactory factory = new SftpSubsystemFactory();
  		list.add(factory);
  		factory.addSftpEventListener(this);
  
  		return list;
  	}
docs: ----- private methods -----