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 (!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;
                }
        
                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);

View Full Code Here


            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);

View Full Code Here

        }
    }


    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();
                session.getFilterChain().fireMessageSent( session, req );
                continue;
            }


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


            int writtenBytes = ch.write( buf.buf() );


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

View Full Code Here

            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 );
                }

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 = ( 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 );
                }

View Full Code Here

        {
            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 );
        }

View Full Code Here

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


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


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

View Full Code Here

        }
    }


    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 );

View Full Code Here

            }


            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 );
                    }

View Full Code Here

            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 );

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.