Examples of java.nio.channels.SocketChannel

java.nio.channels.SocketChannel
A SocketChannel is a selectable channel for part abstraction of stream connecting socket. The socket method of this class can return the related Socket instance, which can handle the socket.
A socket channel is open but not connected when created by open method. After connected by calling the connect method, it will keep connected before closed. The connection is non-blocking that the connect method is for the initial connection and following finishConnect method is for the final steps of connection. The isConnectionPending method can tell the connection is blocked or not; the isConnected method can tell the socket is connected finally or not.

The shut down operation can be independent and asynchronous for input and output. The shutdownInput method is for input, and can make the following read operation fail as end of stream. If the input is shut down and another thread is pending in read operation, the read will end without effect and return end of stream. The shutdownOutput method is for output, and can make the following write operation throwing a ClosedChannelException. If the output is shut down and another is pending in a write operation, an AsynchronousCloseException will thrown to the pending thread.

Socket channels are thread-safe, no more than one thread can read or write at given time. The connect and finishConnect methods are concurrent each other, when they are processing, other read and write will block.

    } catch (Exception e) {
      port = PookaMessagingConstants.S_PORT;
    }
    getLogger().log(Level.FINE, "opening port " + port);
    SocketAddress address = new InetSocketAddress("localhost",port);
    SocketChannel channel = SocketChannel.open();
    channel.configureBlocking(false);
    if (! channel.connect(address)) {
      // we're willing to wait for about a second.
      for (int i = 0; (! channel.finishConnect()) && i < 4; i++) {
  try {
    getLogger().log(Level.FINE, "not connected; sleeping (" + i + ").");
    Thread.currentThread().sleep(250);
  } catch (Exception e) {
  }
      }
    }
    if (channel.isConnected()) {
      getLogger().log(Level.FINE, "got connection.");
      mChannel = channel;
      mChannel.configureBlocking(true);


      mConnected = true;

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    public void Open(String host,int port)
    {
        InetSocketAddress isa = new InetSocketAddress(host, port);
        try
        {
            SocketChannel sc = SocketChannel.open();
            //        SocketChannel sc = (SocketChannel)GetChannel();
            sc.configureBlocking(false);
            if (!sc.connect(isa))
            {
                SetConnecting();
            }
            else
            {

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    public void OnRead()
    {
        m_ibuf.clear();
        try
        {
            SocketChannel sc = (SocketChannel)GetChannel();
            int n = sc.read(m_ibuf);
            m_ibuf.flip();
            if (n == -1)
            {
                Handler().LogError(this, "OnRead", 0, "error while reading", SocketHandler.LOG_LEVEL_FATAL);
                SetCloseAndDelete();

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        }
    } // OnRead
    
    public void OnDelete()
    {
        SocketChannel sc = (SocketChannel)GetChannel();
        try
        {
            sc.close();
        }
        catch (IOException e)
        {
            Handler().LogError(this, "OnDelete", 0, e.toString(), SocketHandler.LOG_LEVEL_ERROR);
        }

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    public void OnWrite()
    {
        m_obuf.flip();
        try
        {
            SocketChannel sc = (SocketChannel)GetChannel();
            int n = sc.write(m_obuf);
            System.out.println(n + " bytes written");
        }
        catch (Exception e)
        {
            Handler().LogError(this, "OnWrite", 0, e.toString(), SocketHandler.LOG_LEVEL_FATAL);

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                SelectionKey key = (SelectionKey)it.next();
                
                // What kind of activity is it?
                if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ)
                {
                    SocketChannel ch = (SocketChannel)key.channel();
                    java.net.Socket ss = (java.net.Socket)ch.socket();
                    Socket s = (Socket)key.attachment();
                    if (s != null)
                    {
//                        System.out.println(s + ": OnRead");
                        s.OnRead();
                        if (s.LineProtocol())
                        {
                            s.ReadLine(); // eat ibuf to m_line, calls OnLine
                        }
                    }
                }
                if ((key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE)
                {
                    SocketChannel ch = (SocketChannel)key.channel();
                    java.net.Socket ss = (java.net.Socket)ch.socket();
                    Socket s = (Socket)key.attachment();
                    if (s != null)
                    {
//                        System.out.println(s + ": OnWrite");
                        s.OnWrite();
                    }
                }
                if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT)
                {
                    ServerSocketChannel ch = (ServerSocketChannel)key.channel();
                    java.net.ServerSocket ss = (java.net.ServerSocket)ch.socket();
                    Socket s = (Socket)key.attachment();
                    if (s != null)
                    {
//                        System.out.println(s + ": OnRead(ACCEPT)");
                        s.OnRead(); // ListenSocket.OnRead will call OnAccept on new Socket
                    }
                }
                if ((key.readyOps() & SelectionKey.OP_CONNECT) == SelectionKey.OP_CONNECT)
                {
                    SocketChannel ch = (SocketChannel)key.channel();
                    java.net.Socket ss = (java.net.Socket)ch.socket();
                    Socket s = (Socket)key.attachment();
                    if (s != null)
                    {
//                        System.out.println(s + ": OnConnect");
                        ch.finishConnect();
                        s.SetConnecting(false);
                        s.GetKey().interestOps(SelectionKey.OP_READ);
                        s.OnConnect();
                    }
                }

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                java.net.Socket js = ss.accept();
                System.out.println( "Got connection from " + js);
                
                // Make sure to make it non-blocking, so we can
                // use a selector on it.
                SocketChannel sc = js.getChannel();
                sc.configureBlocking( false );
                
                // Register it with the selector, for reading
                //        sc.register( selector, SelectionKey.OP_READ );
                
                Socket s = m_creator.Create();

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        int remotePort = getPortFrom(context.getRuntime(), args[1]);
        String localHost = args.length >= 3 ? args[2].convertToString().toString() : null;
        int localPort = args.length == 4 ? getPortFrom(context.getRuntime(), args[3]) : 0;


        try {
            SocketChannel channel = null;
            if(localHost == null) {
                InetSocketAddress addr = new InetSocketAddress(InetAddress.getByName(remoteHost), remotePort);
                channel = SocketChannel.open(addr);
            } else {
                channel = SocketChannel.open();
                Socket socket = channel.socket();
                socket.bind(new InetSocketAddress(InetAddress.getByName(localHost), localPort));
                socket.connect(new InetSocketAddress(InetAddress.getByName(remoteHost), remotePort));
            }
            channel.finishConnect();
            initSocket(context.getRuntime(), new ChannelDescriptor(channel, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch(ConnectException e) {
            throw context.getRuntime().newErrnoECONNREFUSEDError();

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                if (!ready) {
                    // we were woken up without being selected...poll for thread events and go back to sleep
                    context.pollThreadEvents();
                } else {
                    try {
                        SocketChannel connected = ssc.accept();
                        connected.finishConnect();
                        
                        //
                        // Force the client socket to be blocking
                        //
                        synchronized (connected.blockingLock()) {
                            connected.configureBlocking(false);
                            connected.configureBlocking(true);
                        }
        
                        // otherwise one key has been selected (ours) so we get the channel and hand it off
                        socket.initSocket(context.getRuntime(), new ChannelDescriptor(connected, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
                    } catch (InvalidValueException ex) {

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        {
            try {
                if(_length == -1){
                    throw new JodbIOException("no client transaction data size available");
                }
                SocketChannel socketChannel = _readSocket.getChannel();
                long transfered = _file.transferFrom(socketChannel, 0, _length);
                if(JODBConfig.DEBUG){
                    Utils.getLogger(getClass().getName()).log(Level.INFO, "Transfered "+ transfered +" to file "+_file);
                }
                /*

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