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.

            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);
                    }
                }
            }

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            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) {

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    }
    
    public void test_write_LBuffer_positioned() throws Exception {
        // Regression test for Harmony-683
        int position = 16;
        DatagramChannel dc = DatagramChannel.open();
        byte[] sourceArray = new byte[CAPACITY_NORMAL];        
        dc.connect(localAddr1);
        // write
        ByteBuffer sourceBuf = ByteBuffer.wrap(sourceArray);
        sourceBuf.position(position);
        assertEquals(CAPACITY_NORMAL - position, dc.write(sourceBuf));
    }

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    public void test_send_LBuffer_LSocketAddress_PositionNotZero()
            throws Exception {
        // regression test for Harmony-701
        int CAPACITY_NORMAL = 256;
        int position = 16;
        DatagramChannel dc = DatagramChannel.open();
        byte[] sourceArray = new byte[CAPACITY_NORMAL];
        // send ByteBuffer whose position is not zero
        ByteBuffer sourceBuf = ByteBuffer.wrap(sourceArray);
        sourceBuf.position(position);
        int ret = dc.send(sourceBuf, localAddr1);
        // assert send (256 - 16) bytes  
        assertEquals(CAPACITY_NORMAL - position, ret);
        // assert the position of ByteBuffer has been set
        assertEquals(CAPACITY_NORMAL, sourceBuf.position());
    }

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     * @tests DatagramChannel#read(ByteBuffer)
     */
    public void test_read_LByteBuffer_closed_nullBuf() throws Exception {
        // regression test for Harmony-754
        ByteBuffer c = null;
        DatagramChannel channel = DatagramChannel.open();
        channel.close();
        try{
            channel.read(c);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e){
            // expected
        }
    }

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     * @tests DatagramChannel#read(ByteBuffer)
     */
    public void test_read_LByteBuffer_NotConnected_nullBuf() throws Exception {
        // regression test for Harmony-754
        ByteBuffer c = null;
        DatagramChannel channel = DatagramChannel.open();
        try{
            channel.read(c);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e){
            // expected
        }
    }

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     * @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
        }
    }

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    /**
     * @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

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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.increaseWrittenWriteRequests();
                session.getManagerFilterChain().dataWritten( session, marker );
                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 );

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Datagrams

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