Examples of java.nio.channels.SelectableChannel

java.nio.channels.SelectableChannel
A channel that can be multiplexed via a {@link Selector}.
In order to be used with a selector, an instance of this class must first be registered via the {@link #register(Selector,int,Object) register} method. This method returns a new {@link SelectionKey} objectthat represents the channel's registration with the selector.
Once registered with a selector, a channel remains registered until it is deregistered. This involves deallocating whatever resources were allocated to the channel by the selector.
A channel cannot be deregistered directly; instead, the key representing its registration must be cancelled. Cancelling a key requests that the channel be deregistered during the selector's next selection operation. A key may be cancelled explicitly by invoking its {@link SelectionKey#cancel() cancel} method. All of a channel's keys are cancelledimplicitly when the channel is closed, whether by invoking its {@link Channel#close close} method or by interrupting a thread blocked in an I/Ooperation upon the channel.
If the selector itself is closed then the channel will be deregistered, and the key representing its registration will be invalidated, without further delay.
A channel may be registered at most once with any particular selector.
Whether or not a channel is registered with one or more selectors may be determined by invoking the {@link #isRegistered isRegistered} method.
Selectable channels are safe for use by multiple concurrent threads.

Blocking mode
A selectable channel is either in blocking mode or in non-blocking mode. In blocking mode, every I/O operation invoked upon the channel will block until it completes. In non-blocking mode an I/O operation will never block and may transfer fewer bytes than were requested or possibly no bytes at all. The blocking mode of a selectable channel may be determined by invoking its {@link #isBlocking isBlocking} method.
Newly-created selectable channels are always in blocking mode. Non-blocking mode is most useful in conjunction with selector-based multiplexing. A channel must be placed into non-blocking mode before being registered with a selector, and may not be returned to blocking mode until it has been deregistered. @author Mark Reinhold @author JSR-51 Expert Group @version 1.35, 05/11/17 @since 1.4 @see SelectionKey @see Selector

             */
            @Override
            public boolean onAcceptInterest(SelectionKey key, Context ctx)
                    throws IOException {
                try {
                    SelectableChannel channel = acceptWithoutRegistration(key);


                    if (channel != null) {
                        configureChannel(channel);


                        SelectionKey readKey = channel.register(selector,
                                SelectionKey.OP_READ);


                        // Cache the connection.
                        TargetTuple tt = connectionManager.add(readKey, this);

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                //
                // have to register keys with selector thread
                //
                while ((newLink = _registerConnections.poll()) != null) {
                    try {
                        SelectableChannel sc = newLink.getSelectableChannel();


                        if (sc.isOpen()) {
                            if (_log.isLoggable(Level.INFO)) {
                                _log.log(Level.INFO,
                                    "Adding new open channel : " +
                                    newLink.getInfo() +
                                    ", current number of keys in selector = " +
                                    _selector.keys().size());
                            }


                            sc.register(_selector, SelectionKey.OP_READ, newLink);
                        }
                    } catch (Exception e) {
                        _log.log(Level.WARNING, "Failed to register link.", e);
                    }
                }

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        private int bufferSize = DEFAULT_RECEIVE_BB_SIZE;


        @Override
        public boolean execute(Context ctx) throws IOException {
            SelectableChannel channel = ctx.getSelectionKey().channel();


            // Make sure we remove that attribute in case the 


            // ProtocolChain is not the default one.
            ctx.removeAttribute(ProtocolFilter.SUCCESSFUL_READ);


            /*
             * Read filter should be executed only for READ or READ_WRITE
             * operations and never for WRITE. Printing a fine message.
             */
            if (ctx.getCurrentOpType() == Context.OpType.OP_WRITE) {
                if (logger.isLoggable(Level.FINE)) {
                    logger.log(Level.FINE,
                            "sip.network.grizzly.filter.write.warning");
                }


                return false;
            }


            if (!channel.isOpen()) {
                ctx.setKeyRegistrationState(KeyRegistrationState.CANCEL);


                return false;
            }

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        public boolean execute(Context ctx) throws IOException {
            // Make sure we remove that attribute in case the 
            // ProtocolChain is not the default one.
            ctx.removeAttribute(ProtocolFilter.SUCCESSFUL_READ);


            SelectableChannel channel = ctx.getSelectionKey().channel();


            if (ctx.getCurrentOpType() == Context.OpType.OP_WRITE) {
                if (logger.isLoggable(Level.FINER)) {
                    logger.log(Level.FINER,
                            "sip.network.grizzly.filter.write.warning");
                }


                return false;
            }


            if (!channel.isOpen()) {
                ctx.setKeyRegistrationState(KeyRegistrationState.CANCEL);


                return false;
            }
            WorkerThread workerThread = (WorkerThread) Thread.currentThread();

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                } else if (handler == null) {
                    handler = createHandlerUDP(tt);
                }


                if (handler != null) {
                    SelectableChannel channel = handler.getUnderlyingChannel();


                    if ((channel != null) && channel.isOpen() && (handler.getSelectorHandler() != null) && (handler.getSelectorHandler().getAsyncQueueWriter() != null)) {
                        streams.putIfAbsent(tt, handler);
                    } else {
                      if (handler.getUnderlyingChannel() == null) {
                            if (logger.isLoggable(Level.FINEST)){
                                logger.log(

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            if ((key != null) && (key.channel() != null) && (byteBuffer != null)) {
                StringBuffer sb = new StringBuffer();
                for (int i = 0; i < byteBuffer.position(); i++) {
                    sb.append((char) byteBuffer.get(i));
                }
                SelectableChannel channel = key.channel();
                if (channel instanceof DatagramChannel) {
                    DatagramSocket sock = ((DatagramChannel) channel).socket();
                    if (sock != null) {
                      if (ex == null) {
                            if (logger.isLoggable(Level.FINEST)){

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                        null)) {
                    StringBuffer sb = new StringBuffer();
                    for (int i = 0; i < byteBuffer.position(); i++) {
                        sb.append((char) byteBuffer.get(i));
                    }
                    SelectableChannel channel = key.channel();
                    if (channel instanceof DatagramChannel) {
                        DatagramSocket sock =
                                ((DatagramChannel) channel).socket();
                        if (sock != null) {
                            logger.log(Level.FINEST, "STUN OUT ",

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                        null)) {
                    StringBuffer sb = new StringBuffer();
                    for (int i = 0; i < byteBuffer.position(); i++) {
                        sb.append((char) byteBuffer.get(i));
                    }
                    SelectableChannel channel = key.channel();
                    if (channel instanceof DatagramChannel) {
                        DatagramSocket sock =
                                ((DatagramChannel) channel).socket();
                        if (sock != null) {
                            logger.log(Level.FINEST, "STUN ERROR  ",

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                EventHandler eventHandler =
                    (EventHandler)deferredRegistrations.get(i);
                if (orb.transportDebugFlag) {
                    dprint(".handleDeferredRegistrations: " + eventHandler);
                }
                SelectableChannel channel = eventHandler.getChannel();
                SelectionKey selectionKey = null;
                try {
                    selectionKey =
                        channel.register(selector,
                                         eventHandler.getInterestOps(),
                                         (Object)eventHandler);
                } catch (ClosedChannelException e) {
                    if (orb.transportDebugFlag) {
                        dprint(".handleDeferredRegistrations: " + e);

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        return new IoSessionIterator(selector.selectedKeys());
    }


    @Override
    protected void init(NioSession session) throws Exception {
        SelectableChannel ch = (SelectableChannel) session.getChannel();
        ch.configureBlocking(false);
        session.setSelectionKey(ch.register(selector, SelectionKey.OP_READ,
                session));
    }

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Examples of java.nio.channels.SelectableChannel

Blocking mode

Related Classes of java.nio.channels.SelectableChannel