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.

     * @tests DatagramChannel#read(ByteBuffer)
     */
    public void test_read_LByteBuffer_readOnlyBuf() throws Exception {
        // regression test for Harmony-754
        ByteBuffer c = ByteBuffer.allocate(1);
        DatagramChannel channel = DatagramChannel.open();
        try{
            channel.read(c.asReadOnlyBuffer());
            fail("Should throw NotYetConnectedException");
        } catch (NotYetConnectedException e){
            // expected
        }
        channel.connect(localAddr1);
        try{
            channel.read(c.asReadOnlyBuffer());
            fail("Should throw IllegalArgumentException");
        } catch (IllegalArgumentException e){
            // expected
        }
    }

View Full Code Here

    /**
     * @tests DatagramChannel#socket()
     */
    public void test_socket_IllegalBlockingModeException() throws Exception {
        // regression test for Harmony-1036
        DatagramChannel channel = DatagramChannel.open();
        channel.configureBlocking(false);
        DatagramSocket socket = channel.socket();
        try {
            socket.send(null);
            fail("should throw IllegalBlockingModeException");
        } catch (IllegalBlockingModeException e) {
            // expected

View Full Code Here

    }


    @Override
    protected DatagramChannel newHandle(SocketAddress localAddress)
            throws Exception {
        DatagramChannel ch = DatagramChannel.open();


        try {
            if (localAddress != null) {
                ch.socket().bind(localAddress);
            }
            
            return ch;
        } catch (Exception e) {
            // If we got an exception while binding the datagram,
            // we have to close it otherwise we will loose an handle
            ch.close();
            throw e;
        }
    }

View Full Code Here

        setDefaultLocalAddress((SocketAddress) localAddress);
    }


    @Override
    protected DatagramChannel open(SocketAddress localAddress) throws Exception {
        final DatagramChannel c = DatagramChannel.open();
        boolean success = false;
        try {
            new NioDatagramSessionConfig(c).setAll(getSessionConfig());
            c.configureBlocking(false);
            c.socket().bind(localAddress);
            c.register(selector, SelectionKey.OP_READ);
            success = true;
        } finally {
            if (!success) {
                close(c);
            }

View Full Code Here

        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);
        }

View Full Code Here

        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);

View Full Code Here

        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();
    
                    buf.reset();
                    
                    if (!buf.hasRemaining()) {
                        session.increaseWrittenMessages();
                    }
                    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);

View Full Code Here

            RegistrationRequest req = registerQueue.poll();


            if (req == null)
                break;


            DatagramChannel ch = null;
            try {
                ch = DatagramChannel.open();
                DatagramSessionConfig cfg;
                if (req.config.getSessionConfig() instanceof DatagramSessionConfig) {
                    cfg = (DatagramSessionConfig) req.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());
                }


                ch.configureBlocking(false);
                ch.socket().bind(req.address);
                if (req.address == null || req.address.getPort() == 0) {
                    req.address = (InetSocketAddress) ch.socket()
                            .getLocalSocketAddress();
                }
                ch.register(selector, SelectionKey.OP_READ, req);
                channels.put(req.address, ch);


                getListeners().fireServiceActivated(this, req.address,
                        req.handler, req.config);
            } catch (Throwable t) {
                req.exception = t;
            } finally {
                synchronized (req) {
                    req.done = true;
                    req.notify();
                }


                if (ch != null && req.exception != null) {
                    try {
                        ch.disconnect();
                        ch.close();
                    } catch (Throwable e) {
                        ExceptionMonitor.getInstance().exceptionCaught(e);
                    }
                }
            }

View Full Code Here


            if (request == null) {
                break;
            }


            DatagramChannel ch = channels.remove(request.address);


            // close the channel
            try {
                if (ch == null) {
                    request.exception = new IllegalArgumentException(
                            "Address not bound: " + request.address);
                } else {
                    SelectionKey key = ch.keyFor(selector);
                    request.registrationRequest = (RegistrationRequest) key
                            .attachment();
                    key.cancel();
                    selector.wakeup(); // wake up again to trigger thread death
                    ch.disconnect();
                    ch.close();
                }
            } catch (Throwable t) {
                ExceptionMonitor.getInstance().exceptionCaught(t);
            } finally {
                synchronized (request) {

View Full Code Here


        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);

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of java.nio.channels.DatagramChannel

biz.paluch.logging.gelf.intern.GelfUDPSender

biz.paluch.logging.gelf.intern.sender.GelfUDPSender

ch.unifr.nio.framework.HandlerAdapterTest

com.davfx.ninio.common.DatagramReady

com.ericsson.ssa.container.GrizzlyNetworkManager$ReadUDPSelectorHandler

com.esotericsoftware.kryonet.UdpConnection

com.facebook.presto.jdbc.internal.netty.channel.socket.nio.NioDatagramChannel

com.facebook.presto.jdbc.internal.netty.channel.socket.nio.NioDatagramWorker

com.java7developer.chapter2.Listing_2_11

Datagrams

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.