public void sendMessage(Address address, byte[] message) throws java.io.IOException {
      Socket s = null;
      SocketEntry entry = (SocketEntry) sockets.get(address);
      if (logger.isDebugEnabled()) {
        logger.debug("Looking up connection for destination '" + address + "' returned: " + entry);
        logger.debug(sockets.toString());
      }
      if (entry != null) {
        s = entry.getSocket();
      }
      if ((s == null) || (s.isClosed())) {
        if (logger.isDebugEnabled()) {
          logger.debug("Socket for address '" + address + "' is closed, opening it...");
        }
        SocketChannel sc = null;
        try {
          // Open the channel, set it to non-blocking, initiate connect
          sc = SocketChannel.open();
          sc.configureBlocking(false);
          sc.connect(
              new InetSocketAddress(
                  ((TcpAddress) address).getInetAddress(), ((TcpAddress) address).getPort()));
          s = sc.socket();
          entry = new SocketEntry((TcpAddress) address, s);
          entry.addMessage(message);
          sockets.put(address, entry);

          synchronized (pending) {
            pending.add(entry);
          }

          selector.wakeup();
          logger.debug("Trying to connect to " + address);
        } catch (IOException iox) {
          logger.error(iox);
          throw iox;
        }
      } else {
        entry.addMessage(message);
        synchronized (pending) {
          pending.add(entry);
        }
        selector.wakeup();
      }
    }
    public ServerThread() throws IOException {
      setName("DefaultTCPTransportMapping_" + getAddress());
      buf = new byte[getMaxInboundMessageSize()];
      // Selector for incoming requests
      selector = Selector.open();

      if (serverEnabled) {
        // Create a new server socket and set to non blocking mode
        ssc = ServerSocketChannel.open();
        ssc.configureBlocking(false);

        // Bind the server socket
        InetSocketAddress isa =
            new InetSocketAddress(tcpAddress.getInetAddress(), tcpAddress.getPort());
        ssc.socket().bind(isa);
        // Register accepts on the server socket with the selector. This
        // step tells the selector that the socket wants to be put on the
        // ready list when accept operations occur, so allowing multiplexed
        // non-blocking I/O to take place.
        ssc.register(selector, SelectionKey.OP_ACCEPT);
      }
    }
    public void run() {
      // Here's where everything happens. The select method will
      // return when any operations registered above have occurred, the
      // thread has been interrupted, etc.
      try {
        while (!stop) {
          try {
            if (selector.select() > 0) {
              if (stop) {
                break;
              }
              // Someone is ready for I/O, get the ready keys
              Set readyKeys = selector.selectedKeys();
              Iterator it = readyKeys.iterator();

              // Walk through the ready keys collection and process date requests.
              while (it.hasNext()) {
                SelectionKey sk = (SelectionKey) it.next();
                it.remove();
                SocketChannel readChannel = null;
                TcpAddress incomingAddress = null;
                if (sk.isAcceptable()) {
                  // The key indexes into the selector so you
                  // can retrieve the socket that's ready for I/O
                  ServerSocketChannel nextReady = (ServerSocketChannel) sk.channel();
                  // Accept the date request and send back the date string
                  Socket s = nextReady.accept().socket();
                  readChannel = s.getChannel();
                  readChannel.configureBlocking(false);
                  readChannel.register(selector, SelectionKey.OP_READ);

                  incomingAddress = new TcpAddress(s.getInetAddress(), s.getPort());
                  SocketEntry entry = new SocketEntry(incomingAddress, s);
                  sockets.put(incomingAddress, entry);
                  timeoutSocket(entry);
                  TransportStateEvent e =
                      new TransportStateEvent(
                          DefaultTcpTransportMapping.this,
                          incomingAddress,
                          TransportStateEvent.STATE_CONNECTED,
                          null);
                  fireConnectionStateChanged(e);
                } else if (sk.isReadable()) {
                  readChannel = (SocketChannel) sk.channel();
                  incomingAddress =
                      new TcpAddress(
                          readChannel.socket().getInetAddress(), readChannel.socket().getPort());
                } else if (sk.isWritable()) {
                  try {
                    SocketEntry entry = (SocketEntry) sk.attachment();
                    SocketChannel sc = (SocketChannel) sk.channel();
                    if (entry != null) {
                      writeMessage(entry, sc);
                    }
                  } catch (IOException iox) {
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
                            iox);
                    fireConnectionStateChanged(e);
                    sk.cancel();
                  }
                } else if (sk.isConnectable()) {
                  try {
                    SocketEntry entry = (SocketEntry) sk.attachment();
                    SocketChannel sc = (SocketChannel) sk.channel();
                    if ((!sc.isConnected()) && (sc.finishConnect())) {
                      sc.configureBlocking(false);
                      logger.debug("Connected to " + entry.getPeerAddress());
                      // make sure conncetion is closed if not used for timeout
                      // micro seconds
                      timeoutSocket(entry);
                      sc.register(selector, SelectionKey.OP_WRITE, entry);
                    }
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_CONNECTED,
                            null);
                    fireConnectionStateChanged(e);
                  } catch (IOException iox) {
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    sk.cancel();
                  }
                }

                if (readChannel != null) {
                  try {
                    readMessage(sk, readChannel, incomingAddress);
                  } catch (IOException iox) {
                    // IO exception -> channel closed remotely
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    sk.cancel();
                    readChannel.close();
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
                            iox);
                    fireConnectionStateChanged(e);
                  }
                }
              }
            }
          } catch (NullPointerException npex) {
            // There seems to happen a NullPointerException within the select()
            npex.printStackTrace();
            logger.warn("NullPointerException within select()?");
          }
          processPending();
        }
        if (ssc != null) {
          ssc.close();
        }
      } catch (IOException iox) {
        logger.error(iox);
        lastError = iox;
      }
      if (!stop) {
        stop = true;
        synchronized (DefaultTcpTransportMapping.this) {
          server = null;
        }
      }
    }