Examples of java.nio.channels.ServerSocketChannel

java.nio.channels.ServerSocketChannel
A selectable channel for stream-oriented listening sockets.
Server-socket channels are not a complete abstraction of listening network sockets. Binding and the manipulation of socket options must be done through an associated {@link java.net.ServerSocket} object obtained byinvoking the {@link #socket() socket} method. It is not possible to createa channel for an arbitrary, pre-existing server socket, nor is it possible to specify the {@link java.net.SocketImpl} object to be used by a serversocket associated with a server-socket channel.
A server-socket channel is created by invoking the {@link #open() open}method of this class. A newly-created server-socket channel is open but not yet bound. An attempt to invoke the {@link #accept() accept} method of anunbound server-socket channel will cause a {@link NotYetBoundException} tobe thrown. A server-socket channel can be bound by invoking one of the {@link java.net.ServerSocket#bind(java.net.SocketAddress,int) bind} methodsof an associated server socket.
Server-socket channels are safe for use by multiple concurrent threads.
@author Mark Reinhold @author JSR-51 Expert Group @version 1.25, 05/11/17 @since 1.4

    }


    @Override
    protected ServerSocketChannel open(SocketAddress localAddress)
            throws Exception {
        ServerSocketChannel c = ServerSocketChannel.open();
        boolean success = false;
        try {
            c.configureBlocking(false);
            // Configure the server socket,
            c.socket().setReuseAddress(isReuseAddress());
            // XXX: Do we need to provide this property? (I think we need to remove it.)
            c.socket().setReceiveBufferSize(
                    getSessionConfig().getReceiveBufferSize());
            // and bind.
            c.socket().bind(localAddress, getBacklog());
            c.register(selector, SelectionKey.OP_ACCEPT);
            success = true;
        } finally {
            if (!success) {
                close(c);
            }

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        try {
            addressPicker.pickAddress();
        } catch (Throwable e) {
            throw ExceptionUtil.rethrow(e);
        }
        final ServerSocketChannel serverSocketChannel = addressPicker.getServerSocketChannel();
        address = addressPicker.getPublicAddress();
        final Map<String, Object> memberAttributes = findMemberAttributes(config.getMemberAttributeConfig().asReadOnly());
        localMember = new MemberImpl(address, true, UuidUtil.createMemberUuid(address), hazelcastInstance, memberAttributes);
        loggingService.setThisMember(localMember);
        logger = loggingService.getLogger(Node.class.getName());
        initializer = NodeInitializerFactory.create(configClassLoader);
        try {
            initializer.beforeInitialize(this);
        } catch (Throwable e) {
            try {
                serverSocketChannel.close();
            } catch (Throwable ignored) {
            }
            throw ExceptionUtil.rethrow(e);
        }
        securityContext = config.getSecurityConfig().isEnabled() ? initializer.getSecurityContext() : null;

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                            }


                        }
                        else if (o instanceof ServerSocketChannel)
                        {
                            ServerSocketChannel channel = (ServerSocketChannel)o;
                            channel.register(getSelector(),SelectionKey.OP_ACCEPT);
                        }
                        else
                            throw new IllegalArgumentException(o.toString());
                    }
                    catch (CancelledKeyException e)
                    {
                        if (isRunning())
                            Log.warn(e);
                        else
                            Log.debug(e);
                    }
                }
                changes.clear();


                long idle_next = 0;
                long retry_next = 0;
                long now=System.currentTimeMillis();
                synchronized (this)
                {
                    _idleTimeout.setNow(now);
                    _retryTimeout.setNow(now);
                    if (_lowResourcesConnections>0 && _selector.keys().size()>_lowResourcesConnections)
                        _idleTimeout.setDuration(_lowResourcesMaxIdleTime);
                    else 
                        _idleTimeout.setDuration(_maxIdleTime);
                    idle_next=_idleTimeout.getTimeToNext();
                    retry_next=_retryTimeout.getTimeToNext();
                }


                // workout how low to wait in select
                long wait = 1000L;  // not getMaxIdleTime() as the now value of the idle timers needs to be updated.
                if (idle_next >= 0 && wait > idle_next)
                    wait = idle_next;
                if (wait > 0 && retry_next >= 0 && wait > retry_next)
                    wait = retry_next;
    
                // Do the select.
                if (wait > 10) // TODO tune or configure this
                {
                    long before=now;
                    int selected=_selector.select(wait);
                    now = System.currentTimeMillis();
                    _idleTimeout.setNow(now);
                    _retryTimeout.setNow(now);


                    // Look for JVM bug 
                    if (selected==0 && wait>0 && (now-before)<wait/2 && _selector.selectedKeys().size()==0)
                    {
                        if (_jvmBug++>5)  // TODO tune or configure this
                        {
                            // Probably JVM BUG!
                            
                            Iterator iter = _selector.keys().iterator();
                            while(iter.hasNext())
                            {
                                key = (SelectionKey) iter.next();
                                if (key.isValid()&&key.interestOps()==0)
                                {
                                    key.cancel();
                                }
                            }
                            try
                            {
                                Thread.sleep(20);  // tune or configure this
                            }
                            catch (InterruptedException e)
                            {
                                Log.ignore(e);
                            }
                        } 
                    }
                    else
                        _jvmBug=0;
                }
                else 
                {
                    _selector.selectNow();
                    _jvmBug=0;
                }


                // have we been destroyed while sleeping\
                if (_selector==null || !_selector.isOpen())
                    return;


                // Look for things to do
                Iterator iter = _selector.selectedKeys().iterator();
                while (iter.hasNext())
                {
                    key = (SelectionKey) iter.next();
                                        
                    try
                    {
                        if (!key.isValid())
                        {
                            key.cancel();
                            SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment();
                            if (endpoint != null)
                                endpoint.doUpdateKey();
                            continue;
                        }


                        Object att = key.attachment();
                        if (att instanceof SelectChannelEndPoint)
                        {
                            SelectChannelEndPoint endpoint = (SelectChannelEndPoint)att;
                            endpoint.dispatch();
                        }
                        else if (key.isAcceptable())
                        {
                            SocketChannel channel = acceptChannel(key);
                            if (channel==null)
                                continue;


                            channel.configureBlocking(false);


                            // TODO make it reluctant to leave 0
                            _nextSet=++_nextSet%_selectSet.length;


                            // Is this for this selectset
                            if (_nextSet==_setID)
                            {
                                // bind connections to this select set.
                                SelectionKey cKey = channel.register(_selectSet[_nextSet].getSelector(), SelectionKey.OP_READ);
                                SelectChannelEndPoint endpoint=newEndPoint(channel,_selectSet[_nextSet],cKey);
                                cKey.attach(endpoint);
                                if (endpoint != null)
                                    endpoint.dispatch();
                            }
                            else
                            {
                                // nope - give it to another.
                                _selectSet[_nextSet].addChange(channel);
                                _selectSet[_nextSet].wakeup();
                            }
                        }
                        else if (key.isConnectable())
                        {
                            // Complete a connection of a registered channel
                            SocketChannel channel = (SocketChannel)key.channel();
                            boolean connected=false;
                            try
                            {
                                connected=channel.finishConnect();
                            }
                            catch(Exception e)
                            {
                                connectionFailed(channel,e,att);
                            }

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            ss.add(SSLFactory.getServerSocket(DatabaseDescriptor.getEncryptionOptions(), localEp, DatabaseDescriptor.getSSLStoragePort()));
            // setReuseAddress happens in the factory.
            logger_.info("Starting Encrypted Messaging Service on SSL port {}", DatabaseDescriptor.getSSLStoragePort());
        }


        ServerSocketChannel serverChannel = ServerSocketChannel.open();
        ServerSocket socket = serverChannel.socket();
        socket.setReuseAddress(true);
        InetSocketAddress address = new InetSocketAddress(localEp, DatabaseDescriptor.getStoragePort());
        try
        {
            socket.bind(address);

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     * Regression test for Harmony-1947.
     */
    public void test_finishConnect() throws Exception {
        SocketAddress address = new InetSocketAddress("localhost", 2046);


        ServerSocketChannel theServerChannel = ServerSocketChannel.open();
        ServerSocket serversocket = theServerChannel.socket();
        serversocket.setReuseAddress(true);
        // Bind the socket
        serversocket.bind(address);


        boolean doneNonBlockingConnect = false;

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    public void testReadByteBuffer_Direct2() throws IOException {
        byte[] request = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        ByteBuffer buffer = ByteBuffer.allocateDirect(128);


        ServerSocketChannel server = ServerSocketChannel.open();
        server.socket().bind(
                new InetSocketAddress(InetAddress.getLocalHost(), 0), 5);
        Socket client = new Socket(InetAddress.getLocalHost(), server.socket()
                .getLocalPort());
        client.setTcpNoDelay(false);
        Socket worker = server.socket().accept();
        SocketChannel workerChannel = worker.getChannel();


        OutputStream out = client.getOutputStream();
        out.write(request);
        out.close();


        buffer.limit(5);
        int bytesRead = workerChannel.read(buffer);
        assertEquals(5, bytesRead);
        assertEquals(5, buffer.position());


        buffer.limit(request.length);
        bytesRead = workerChannel.read(buffer);
        assertEquals(6, bytesRead);


        buffer.flip();
        assertEquals(request.length, buffer.limit());


        assertEquals(ByteBuffer.wrap(request), buffer);


        client.close();
        worker.close();
        server.close();
    }

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     *        closed
     */
    public void test_socketChannel_read_ByteBufferII_remoteClosed()
            throws Exception {
        // regression 1 for HARMONY-549
        ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(localAddr2);
        SocketChannel sc = SocketChannel.open();
        sc.connect(localAddr2);
        ssc.accept().close();
        ByteBuffer[] buf = { ByteBuffer.allocate(10) };
        assertEquals(-1, sc.read(buf, 0, 1));
        ssc.close();
        sc.close();
    }

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    /**
     * @tests SocketChannel#write(ByteBuffer[], int, int)
     */
    public void test_socketChannel_write_ByteBufferII() throws Exception {
        // regression 2 for HARMONY-549
        ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(localAddr2);
        SocketChannel sc = SocketChannel.open();
        sc.connect(localAddr2);
        SocketChannel sock = ssc.accept();
        ByteBuffer[] buf = { ByteBuffer.allocate(10), null };
        try {
            sc.write(buf, 0, 2);
            fail("should throw NPE");
        } catch (NullPointerException e) {
            // expected
        }
        ssc.close();
        sc.close();
        ByteBuffer target = ByteBuffer.allocate(10);
        assertEquals(-1, sock.read(target));
    }

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    /**
     * @tests SocketChannel#read(ByteBuffer[], int, int) with a null ByteBuffer
     */
    public void test_socketChannel_read_ByteBufferII_bufNULL() throws Exception {
        // regression 3 for HARMONY-549
        ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(localAddr2);
        SocketChannel sc = SocketChannel.open();
        sc.connect(localAddr2);
        ssc.accept();
        ByteBuffer[] buf = new ByteBuffer[2];
        buf[0] = ByteBuffer.allocate(1);
        // let buf[1] be null
        try {
            sc.read(buf, 0, 2);
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        ssc.close();
        sc.close();
    }

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    /**
     * @tests SocketChannel#write(ByteBuffer) after close
     */
    public void test_socketChannel_write_close() throws Exception {
        // regression 4 for HARMONY-549
        ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(localAddr2);
        SocketChannel sc = SocketChannel.open();
        sc.connect(localAddr2);
        SocketChannel sock = ssc.accept();
        ByteBuffer buf = null;
        ssc.close();
        sc.close();
        try {
            sc.write(buf);
            fail("should throw NPE");
        } catch (NullPointerException e) {

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