MINA is a Java API for developing network applications that is event-driven and asynchronous. It allows separation of concerns between wire protocols and business logic. The document discusses MINA's architecture, components like filters and handlers, and provides a simple chat server example. It recommends using MINA 2.0 and describes changes from earlier versions.

1. ApacheCon EU 2008

2. Niklas Gustavsson [email_address] http://protocol7.com

3. MINA commiter since 2007 On FtpServer since 2005

4. So, what's MINA ?

5. Java API for network applications

6. Event driven Asynchronous

7. Server side Client side

8. Pluggable implementations

9. You will probably use the NIO implementation

10. ...and the VmPipe

11. Separation of concerns Wire ↔ Business logic

12. MINA architecture

13. IoService IoConnector IoAcceptor

14. IoFilter

15. Protocol codec

16. Lots of free stuff!

17. Traffic shapers SSL Compression Session based logging Firewall

18. IoHandler

19. Concurrency... yeay!

20. Acceptor thread Connector thread

21. I/O processor thread Cores + 1

22. ExecutorFilter

23. Fine, so what's best for me?

24. What's new in MINA 2.0

25. Thread model redesigned

26. Simplified configuration

27. ByteBuffer now IoBuffer and default to heap allocation

28. IoSessionLogger removed

29. And lots and lots of Cleanup and improvements

30. So, which version should I use?

31. MINA 1.0 MINA 1.1 MINA 2.0

32. Migrating from 1.x

33. Review thread model

34. Update configuration

35. Remove IoSessionLogger

36. Update class and package names

37. DEMO!

38. Simple chat server in MINA

39. public final static Chat INSTANCE = new Chat(); private List<User> users = new ArrayList<User>(); public void addUser(User user) { users.add(user); } public void removeUser(User user) { users.remove(user); } public void talkToAll(Message msg) { for(User user : users) { user.talkTo(msg); } }

40. public class ChatDecoder extends CumulativeProtocolDecoder { protected boolean doDecode(IoSession session, IoBuffer buffer, ProtocolDecoderOutput out) throws Exception { if(do we have all the data we need?) { Message msg = new Message(user, text); out.write(msg); return true; } else { return false; } } }

41. public class ChatHandler extends IoHandlerAdapter { public void sessionCreated(IoSession session) throws Exception { User user = new MinaUser(session); session.setAttribute(USER_ATTRIBUTE, user); Chat.INSTANCE.addUser(user); }

42. ChatHandler continued... public void messageReceived(IoSession session, Object o) throws Exception { Message msg = (Message) o; if(msg.getText().equalsIgnoreCase(&quot;QUIT&quot;)) { session.closeOnFlush(); } else { Chat.INSTANCE.talkToAll(msg); } } ... }

43. SocketAcceptor acceptor = new NioSocketAcceptor(); acceptor.getFilterChain().addLast(&quot;codec&quot;, new ProtocolCodecFilter(new ChatCodecFactory()) ); acceptor.setIdleTime(IdleStatus.BOTH_IDLE, 60); acceptor.setHandler(new ChatHandler()); acceptor .bind(new InetSocketAddress(6789));

44. Fire up your terminals telnet 62.12.11.90 6789

45. http://mina.apache.org

46. [email_address]

47. Questions ?

48. http://flickr.com/photos/samiksha/408007916/ http://flickr.com/photos/henrikmoltke/142750871/