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.

        }
    }


    private void flush( DatagramSession session ) throws IOException
    {
        DatagramChannel ch = session.getChannel();


        Queue writeBufferQueue = session.getWriteBufferQueue();
        Queue writeMarkerQueue = session.getWriteMarkerQueue();


        ByteBuffer buf;
        Object marker;
        for( ;; )
        {
            synchronized( writeBufferQueue )
            {
                buf = ( ByteBuffer ) writeBufferQueue.first();
                marker = writeMarkerQueue.first();
            }


            if( buf == null )
                break;


            if( buf.remaining() == 0 )
            {
                // pop and fire event
                synchronized( writeBufferQueue )
                {
                    writeBufferQueue.pop();
                    writeMarkerQueue.pop();
                }


                try
                {
                    buf.release();
                }
                catch( IllegalStateException e )
                {
                    session.getManagerFilterChain().exceptionCaught( session, e );
                }


                session.getManagerFilterChain().dataWritten( session, marker );
                continue;
            }


            int writtenBytes = ch
                    .send( buf.buf(), session.getRemoteAddress() );


            SelectionKey key = session.getSelectionKey();
            if( writtenBytes == 0 )
            {

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            }


            if( req == null )
                break;


            DatagramChannel ch = null;
            try
            {
                ch = DatagramChannel.open();
                ch.configureBlocking( false );
                ch.socket().bind( req.address );
                ch.register( selector, SelectionKey.OP_READ, req );
                channels.put( req.address, ch );
            }
            catch( Throwable t )
            {
                req.exception = t;
            }
            finally
            {
                synchronized( req )
                {
                    req.done = true;
                    req.notify();
                }


                if( ch != null && req.exception != null )
                {
                    try
                    {
                        ch.close();
                    }
                    catch( Throwable e )
                    {
                        exceptionMonitor.exceptionCaught( this, e );
                    }

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            if( request == null )
            {
                break;
            }


            DatagramChannel ch = ( DatagramChannel ) 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 );
                    key.cancel();
                    selector.wakeup(); // wake up again to trigger thread death
                    ch.close();
                }
            }
            catch( Throwable t )
            {
                exceptionMonitor.exceptionCaught( this, t );

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


        Selector selector = getSelector();
        DatagramChannel ch = (DatagramChannel) 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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        if (!key.isValid()) {
            return false;
        }
        key.interestOps(key.interestOps() & (~SelectionKey.OP_WRITE));


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


        int writtenBytes = 0;
        int maxWrittenBytes = ((DatagramSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req;
                synchronized (writeRequestQueue) {
                    req = (WriteRequest) writeRequestQueue.first();
                }
    
                if (req == null)
                    break;
    
                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    // pop and fire event
                    synchronized (writeRequestQueue) {
                        writeRequestQueue.pop();
                    }


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


            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 = (DatagramSessionConfig) 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);
                synchronized (channels) {
                    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);
                    }
                }
            }

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            if (request == null) {
                break;
            }


            DatagramChannel ch;
            synchronized (channels) {
                ch = (DatagramChannel) 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) {

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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 = (DatagramSessionConfig) 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 (this) {
            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 writeRequestQueue = session.getWriteRequestQueue();


        int writtenBytes = 0;
        int maxWrittenBytes = ((DatagramSessionConfig) session.getConfig()).getSendBufferSize() << 1;
        try {
            for (;;) {
                WriteRequest req;
                synchronized (writeRequestQueue) {
                    req = (WriteRequest) writeRequestQueue.first();
                }
    
                if (req == null)
                    break;
    
                ByteBuffer buf = (ByteBuffer) req.getMessage();
                if (buf.remaining() == 0) {
                    // pop and fire event
                    synchronized (writeRequestQueue) {
                        writeRequestQueue.pop();
                    }
    
                    buf.reset();
                    
                    if (!buf.hasRemaining()) {
                        session.increaseWrittenMessages();
                    }
                    
                    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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