Socket asynchronous naga instance details

This article describes how to use Socket asynchronous naga instances. I hope this tutorial will be helpful to you.

The naga project was recommended by others on Stack Overflow. I just wrote something simple. I tried it when I saw that the pseudocode on the project homepage was quite concise.

The Code is as follows:

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NIOService service = new NIOService; NIOServerSocket serverSocket = service. openServerSocket (1234 ); ServerSocket. setConnectionAcceptor (myAcceptor ); ServerSocket. listen (myObserver ); NIOService service = new NIOService; NIOSocket serverSocket = service. openSocket (www.bkjia. c0m, 1234 ); Socket. listen (myObserver ); // Asynchronous write by default: Socket. write ("Some message". getBytes ());

The code is quite simple, so it won't be too long. It is transformed from the official DEMO code.

As shown in the pseudo-code example, you only need to add a ServerSocketObserverAdapter to the socket listener.

The Code is as follows:

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Package com. socket. naga;   Import java. io. ByteArrayInputStream; Import java. io. ByteArrayOutputStream; Import java. io. DataInputStream; Import java. io. DataOutputStream; Import java. io. IOException; Import java. util. HashMap; Import java. util. Map;   Import naga. ConnectionAcceptor; Import naga. NIOServerSocket; Import naga. NIOService; Import naga. NIOSocket; Import naga. ServerSocketObserverAdapter; Import naga. SocketObserverAdapter; Import naga. packetreader. RegularPacketReader; Import naga. packetwriter. RegularPacketWriter;   Public class ValidationServer { Private NIOService service; Private NIOServerSocket socket;   Public ValidationServer () throws IOException { Service = new NIOService (); }   Public void start () throws IOException { Int port = 9001; Socket = service. openServerSocket (port ); Final Map <String, String> passwords = new HashMap <String, String> (); Passwords. put ("Admin", "password "); Passwords. put ("Aaron", "AAAAAAAA "); Passwords. put ("Bob", "QWERTY "); Passwords. put ("Lisa", "secret ");   Socket. listen (new ServerSocketObserverAdapter (){ Public void newConnection (NIOSocket nioSocket ){ System. out. println ("Received connection:" + nioSocket );   NioSocket. setPacketReader (new RegularPacketReader (1, true ));   NioSocket. setPacketWriter (new RegularPacketWriter (1, true ));   NioSocket. listen (new SocketObserverAdapter (){ Public void packetReceived (NIOSocket socket, byte [] packet ){ System. out. println ("Login attempt from" + socket ); Try { DataInputStream stream = new DataInputStream (new ByteArrayInputStream (packet ));   String user = stream. readUTF (); String password = stream. readUTF ();   ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream (); DataOutputStream out = new DataOutputStream (byteArrayOutputStream );   If (! Passwords. containsKey (user )){ System. out. println ("Unknown user:" + user ); Out. writeUTF ("NO_SUCH_USER "); } Else if (! Passwords. get (user). equals (password )){ Out. writeUTF ("INCORRECT_PASS "); System. out. println ("Failed login for:" + user ); } Else { Out. writeUTF (user + "LOGIN_ OK "); System. out. println ("Successful login for:" + user ); }   Out. flush (); Socket. write (byteArrayOutputStream. toByteArray ());   Socket. closeAfterWrite (); } Catch (IOException e ){ Socket. close (); } } }); }   }); Socket. setConnectionAcceptor (ConnectionAcceptor. ALLOW );   While (true ){ Service. selectBlocking (); } }   Public void close (){ If (socket. isOpen ()) Socket. close ();   If (service. isOpen ()) Service. close (); }   Public static void main (String [] args ){ Try { ValidationServer validationServer = new ValidationServer (); ValidationServer. start (); // ValidationServer. close (); } Catch (Exception e ){ E. printStackTrace (); } } }

The client adds SocketObserver to the listener.

The Code is as follows:

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Package com. socket. naga;   Import java. io. ByteArrayInputStream; Import java. io. ByteArrayOutputStream; Import java. io. DataInputStream; Import java. io. DataOutputStream; Import java. io. IOException; Import java. util. HashMap; Import java. util. Map; Import java. util. Map. Entry;   Import naga. NIOService; Import naga. NIOSocket; Import naga. SocketObserver; Import naga. packetreader. RegularPacketReader; Import naga. packetwriter. RegularPacketWriter;   Public class ValidationClient { Private NIOService service; Private NIOSocket socket;   Public ValidationClient () throws IOException { Service = new NIOService (); }   Public void send (final String account, final String password) throws IOException { ByteArrayOutputStream stream = new ByteArrayOutputStream (); DataOutputStream dataStream = new DataOutputStream (stream ); DataStream. writeUTF (account ); DataStream. writeUTF (password ); DataStream. flush (); Final byte [] content = stream. toByteArray (); DataStream. close ();   Socket = service. openSocket ("127.0.0.1", 9001 ); Socket. setPacketReader (new RegularPacketReader (1, true )); Socket. setPacketWriter (new RegularPacketWriter (1, true ));   // Start listening to the socket. Socket. listen (new SocketObserver (){ Public void connectionOpened (NIOSocket nioSocket ){ System. out. println ("Sending login..." + account + "//" + password ); NioSocket. write (content ); }   Public void packetReceived (NIOSocket socket, byte [] packet ){ Try { // Read the UTF-reply and print it. String reply = new DataInputStream (new ByteArrayInputStream (packet). readUTF (); System. out. println ("Reply was:" + reply ); } Catch (Exception e ){ // E. printStackTrace (); } }   Public void connectionBroken (NIOSocket nioSocket, Exception exception ){ System. out. println ("Connection failed." + nioSocket. isOpen () + "" + exception. getMessage ()); } });   While (true) {// wait Service. selectBlocking (); } }   Public static void main (String [] args) throws IOException { Final Map <String, String> passwords = new HashMap <String, String> (); Passwords. put ("Admin", "password "); Passwords. put ("Aaron", "AAAAAAAA "); Passwords. put ("Bob", "QWERTY "); Passwords. put ("Lisa", "secret ");   ValidationClient client = new ValidationClient (); For (Entry <String, String> pasword: passwords. entrySet ()){ Client. send (pasword. getKey (), pasword. getValue ()); } // Client. stop (); } }

It is not as good as Netty's design and not as elegant as it is in terms of details. It is quite good to write a demo.