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.


            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 = (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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        Iterator it = keys.iterator();
        while (it.hasNext()) {
            SelectionKey key = (SelectionKey) 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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            }
        }
    }


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


        Queue writeRequestQueue = session.getWriteRequestQueue();


        WriteRequest req;
        for (;;) {
            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();
                }


                session.increaseWrittenMessages();
                buf.reset();
                ((DatagramFilterChain) session.getFilterChain())
                        .fireMessageSent(session, req);
                continue;
            }


            SelectionKey key = session.getSelectionKey();
            if (key == null) {
                scheduleFlush(session);
                break;
            }
            if (!key.isValid()) {
                continue;
            }


            SocketAddress destination = req.getDestination();
            if (destination == null) {
                destination = session.getRemoteAddress();
            }


            int writtenBytes = ch.send(buf.buf(), destination);


            if (writtenBytes == 0) {
                // Kernel buffer is full
                key.interestOps(key.interestOps() | SelectionKey.OP_WRITE);
            } else if (writtenBytes > 0) {

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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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    }


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

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        {
            throw new IllegalArgumentException( "Unexpected local address type: "
                                                + localAddress.getClass() );
        }
        
        DatagramChannel ch = DatagramChannel.open();
        boolean initialized = false;
        try
        {
            ch.socket().setReuseAddress( true );
            if( localAddress != null )
            {
                ch.socket().bind( localAddress );
            }
            ch.connect( address );
            ch.configureBlocking( false );
            initialized = true;
        }
        finally
        {
            if( !initialized )
            {
                ch.close();
            }
        }


        RegistrationRequest request = new RegistrationRequest( ch, handler );
        synchronized( this )

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        }
    }


    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.write( buf.buf() );


            SelectionKey key = session.getSelectionKey();
            if( writtenBytes == 0 )
            {
                // Kernel buffer is full

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        while( it.hasNext() )
        {
            SelectionKey key = ( SelectionKey ) it.next();
            it.remove();


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


            RegistrationRequest req = ( RegistrationRequest ) key.attachment();
            DatagramSession session = new DatagramSession(
                    filters, ch, req.handler );
            session.setSelectionKey( key );

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Datagrams

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