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.

        while (!closed) {
            try {
                readBuffer.clear();
                readBuffer.limit(0);


                SocketChannel sc = SocketChannel.open(address);
                sc.socket().setReceiveBufferSize(256 * 1024);
                logger.info("Connected to " + address);
                ByteBuffer bb = ByteBuffer.allocate(8);
                bb.putLong(0, chronicle.size());
                IOTools.writeAllOrEOF(sc, bb);
                return sc;

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        @Override
        public void run() {
            Thread.currentThread().setName(name + "-acceptor");
            try {
                while (!closed) {
                    SocketChannel socket = server.accept();
                    service.execute(new Handler(socket));
                }
            } catch (IOException e) {
                if (!closed)
                    logger.log(Level.SEVERE, "Acceptor dying", e);

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        @Override
        public void run() {
            Thread.currentThread().setName(name + "-acceptor");
            try {
                while (!closed) {
                    SocketChannel socket = server.accept();
                    service.execute(new Handler(socket));
                }
            } catch (IOException e) {
                if (!closed)
                    logger.log(Level.SEVERE, "Acceptor dying", e);

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        public void run() {
            try {
                ByteBuffer bb = ByteBuffer.allocateDirect(64 * 1024);
                System.err.println("Accepting connect on " + ssc.socket().getLocalPort());
                while (!Thread.interrupted()) {
                    SocketChannel sc = ssc.accept();
                    if (BUSY)
                        sc.configureBlocking(false);


                    String ra = sc.socket().getInetAddress().toString();
                    System.err.println("... connect to " + ra);
                    try {
                        sc.socket().setTcpNoDelay(true);
                        while (sc.read(bb) >= 0) {
                            bb.flip();
//                            System.out.println("e "+bb.remaining());
                            IOTools.writeAllOrEOF(sc, bb);
                            bb.clear();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        sc.close();
                    }
                }
            } catch (ClosedByInterruptException ignored) {
            } catch (IOException e) {
                e.printStackTrace();

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        @SuppressWarnings("unchecked")
        final Excerpt excerpt = chronicle.createExcerpt();


        @Override
        public void run() {
            SocketChannel sc = null;
            try {
                while (!closed) {
                    if (sc == null || !sc.isOpen())
                        sc = createConnection();
                    else
                        readNextExcerpt(sc);
                }
            } finally {

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            if (closed) {
                return null;
            }
            do {
                try {
                    SocketChannel sc = SocketChannel.open(address);
                    ByteBuffer bb = ByteBuffer.allocate(8);
                    bb.putLong(0, chronicle.size());
                    IOTools.writeAllOrEOF(sc, bb);
                    return sc;

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  /**
   * construct a NIOConnection from a selection key
   */
  PacketConnection(SelectionKey sk) {
    SocketChannel sch = (SocketChannel) sk.channel();
    if (sch.isConnected()) // connected immediatedly if local on *nix
    {
      sk.interestOps(SelectionKey.OP_READ);
      state = Connection.OPEN;
    } else if (sch.isConnectionPending()) {
      sk.interestOps(SelectionKey.OP_CONNECT);
      state = Connection.OPENING;
    }
    this.sk = sk; // link this to the key
    sk.attach(this);

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  /**
   * process a connect complete selection
   */
  public void doConnect() {
    SocketChannel sc = (SocketChannel) sk.channel();
    try {
      sc.finishConnect();
      sk.interestOps(sk.interestOps() & ~SelectionKey.OP_CONNECT); 
      log.fine("connect complete");
      state = Connection.OPEN;
    } catch (IOException e) {
      e.printStackTrace();

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  /**
   * process a read ready selection
   */
  public void doRead() {
    SocketChannel sc = (SocketChannel) sk.channel();
    if (sc.isOpen()) {


      int len;
      recvBuffer.clear();
      try {
        len = sc.read(recvBuffer);
      } catch (IOException e) {
        //e.printStackTrace();
        len = -1;
      } // error look like eof
      log.finer("read len=" + len);

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  /*
   * close the connection and its socket
   */
  public void close() {
    if (state != Connection.CLOSED) {
      SocketChannel sc = (SocketChannel) sk.channel();
      if (sc.isOpen()) {
        if (state == Connection.OPEN) // open attempt graceful
        // shutdown
        {
          log.fine("shutting down");
          state = Connection.CLOSING;
          Socket sock = sc.socket();
          try {
            sock.shutdownOutput();
          } catch (IOException se) {
            log.severe("shutdown failed: " + se.getMessage());
            log.log(Level.FINE, "details: ", se);

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