7.3. サービスの開発

		  class AirlineReservationSystem
{
	public void reserveSeat (...);
	public void querySeat (...);
	public void upgradeSeat (...);
}

		  @Process
public Message process (Message message) throws Exception
{
	String opcode = message.getBody().get(“org.example.flight.opcode”);
	
	if (opcode.equals(“reserve”))
		reserveSeat(message);
	
	else if (opcode.equals(“query”))
		querySeat(message);
	
	else if (opcode.equals(“upgrade”))
		upgradeSeat(message);
		
	else
		throw new InvalidOpcode();
	
	return null;
}