Examples of java.nio.channels.DatagramChannel

java.nio.channels.DatagramChannel
A DatagramChannel is a selectable channel for part abstraction of datagram socket. The socket method of this class can return the related DatagramSocket instance, which can handle the socket.
A datagram channel is open but not connected when created by open method. After connected, it will keep the connected status before disconnecting or closing. The benefit of a connected channel is the reduced effort of security checks during send and receive. When invoking read or write, a connected channel is required.

Datagram channels are thread-safe, no more than one thread can read or write at given time.

        }
        return ch;
    }


    private static DatagramChannel createDatagramChannel(final SocketAddress sockAddr, final boolean blocking) {
        final DatagramChannel ch;
        try {
            ch = DatagramChannel.open();
            ch.configureBlocking(blocking);
        } catch (IOException e) {
            LOG.error("Failed to open DatagramChannel.", e);
            throw new IllegalStateException(e);
        }
        try {
            ch.socket().setBroadcast(false);
        } catch (SocketException e) {
            LOG.error("Failed to configure socket.", e);
            throw new IllegalStateException(e);
        }
        try {
            ch.connect(sockAddr);
        } catch (IOException e) {
            LOG.error("Failed to connect socket: " + sockAddr, e);
            throw new IllegalStateException(e);
        }
        return ch;

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      throw ioEx;
    }
  }


  public InetSocketAddress readFromAddress () throws IOException {
    DatagramChannel datagramChannel = this.datagramChannel;
    if (datagramChannel == null) throw new SocketException("Connection is closed.");
    lastCommunicationTime = System.currentTimeMillis();
    return (InetSocketAddress)datagramChannel.receive(readBuffer);
  }

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  /**
   * This method is thread safe.
   */
  public int send (Connection connection, Object object, SocketAddress address) throws IOException {
    DatagramChannel datagramChannel = this.datagramChannel;
    if (datagramChannel == null) throw new SocketException("Connection is closed.");
    synchronized (writeLock) {
      try {
        Context context = Kryo.getContext();
        context.put("connection", connection);
        context.setRemoteEntityID(connection.id);
        kryo.writeClassAndObject(writeBuffer, object);
        writeBuffer.flip();
        int length = writeBuffer.limit();
        datagramChannel.send(writeBuffer, address);


        lastCommunicationTime = System.currentTimeMillis();


        boolean wasFullWrite = !writeBuffer.hasRemaining();
        return wasFullWrite ? length : -1;

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    }


    @JRubyMethod(visibility = Visibility.PRIVATE)
    public IRubyObject initialize(ThreadContext context) {
        try {
            DatagramChannel channel = DatagramChannel.open();
            initSocket(context.getRuntime(), new ChannelDescriptor(channel, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (org.jruby.util.io.InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch (ConnectException e) {
            throw context.getRuntime().newErrnoECONNREFUSEDError();

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        if (config == null) {
            config = getDefaultConfig();
        }


        DatagramChannel ch = null;
        boolean initialized = false;
        try {
            ch = DatagramChannel.open();
            DatagramSessionConfig cfg;
            if (config.getSessionConfig() instanceof DatagramSessionConfig) {
                cfg = (DatagramSessionConfig) config.getSessionConfig();
            } else {
                cfg = getDefaultConfig().getSessionConfig();
            }


            ch.socket().setReuseAddress(cfg.isReuseAddress());
            ch.socket().setBroadcast(cfg.isBroadcast());
            ch.socket().setReceiveBufferSize(cfg.getReceiveBufferSize());
            ch.socket().setSendBufferSize(cfg.getSendBufferSize());


            if (ch.socket().getTrafficClass() != cfg.getTrafficClass()) {
                ch.socket().setTrafficClass(cfg.getTrafficClass());
            }


            if (localAddress != null) {
                ch.socket().bind(localAddress);
            }
            ch.connect(address);
            ch.configureBlocking(false);
            initialized = true;
        } catch (IOException e) {
            return DefaultConnectFuture.newFailedFuture(e);
        } finally {
            if (!initialized && ch != null) {
                try {
                    ch.disconnect();
                    ch.close();
                } catch (IOException e) {
                    ExceptionMonitor.getInstance().exceptionCaught(e);
                }
            }
        }


        RegistrationRequest request = new RegistrationRequest(ch, handler,
                config);
        synchronized (lock) {
            try {
                startupWorker();
            } catch (IOException e) {
                try {
                    ch.disconnect();
                    ch.close();
                } catch (IOException e2) {
                    ExceptionMonitor.getInstance().exceptionCaught(e2);
                }
    
                return DefaultConnectFuture.newFailedFuture(e);

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        if (!key.isValid()) {
            return false;
        }
        key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));


        DatagramChannel ch = session.getChannel();
        Queue<WriteRequest> writeRequestQueue = session.getWriteRequestQueue();


        int writtenBytes = 0;
        int maxWrittenBytes = ((DatagramSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req = writeRequestQueue.peek();
        
                if (req == null)
                    break;
        
                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    // pop and fire event
                    writeRequestQueue.poll();
        
                    session.increaseWrittenMessages();
                    buf.reset();
                    session.getFilterChain().fireMessageSent(session, req);
                    continue;
                }
        
                int localWrittenBytes = ch.write(buf.buf());
                writtenBytes += localWrittenBytes;
    
                if (localWrittenBytes == 0 || writtenBytes >= maxWrittenBytes) {
                    // Kernel buffer is full or wrote too much
                    key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);

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            if (session == null)
                break;
            else {
                SelectionKey key = session.getSelectionKey();
                DatagramChannel ch = (DatagramChannel) key.channel();
                try {
                    ch.disconnect();
                    ch.close();
                } catch (IOException e) {
                    ExceptionMonitor.getInstance().exceptionCaught(e);
                }


                getListeners().fireSessionDestroyed(session);

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        if (localAddress == null) {
            throw new NullPointerException("localAddress");
        }


        Selector selector = this.selector;
        DatagramChannel ch = channels.get(localAddress);
        if (selector == null || ch == null) {
            throw new IllegalArgumentException("Unknown localAddress: "
                    + localAddress);
        }


        SelectionKey key = ch.keyFor(selector);
        if (key == null) {
            throw new IllegalArgumentException("Unknown localAddress: "
                    + localAddress);
        }

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        Iterator<SelectionKey> it = keys.iterator();
        while (it.hasNext()) {
            SelectionKey key = it.next();
            it.remove();


            DatagramChannel ch = (DatagramChannel) key.channel();


            RegistrationRequest req = (RegistrationRequest) key.attachment();
            try {
                if (key.isReadable()) {
                    readSession(ch, req);

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        if (!key.isValid()) {
            return false;
        }
        key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));


        DatagramChannel ch = session.getChannel();
        Queue<WriteRequest> writeRequestQueue = session.getWriteRequestQueue();


        int writtenBytes = 0;
        int maxWrittenBytes = ((DatagramSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req = writeRequestQueue.peek();
    
                if (req == null)
                    break;
    
                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    // pop and fire event
                    writeRequestQueue.poll();
    
                    session.increaseWrittenMessages();
                    buf.reset();
                    session.getFilterChain().fireMessageSent(session, req);
                    continue;
                }
    
                SocketAddress destination = req.getDestination();
                if (destination == null) {
                    destination = session.getRemoteAddress();
                }
    
                int localWrittenBytes = ch.send(buf.buf(), destination);
                writtenBytes += localWrittenBytes;
    
                if (localWrittenBytes == 0 || writtenBytes >= maxWrittenBytes) {
                    // Kernel buffer is full or wrote too much
                    key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);

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Datagrams

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