Examples of java.nio.channels.Selector.select()

java.nio.channels.Selector.select()
Selects a set of keys whose corresponding channels are ready for I/O operations.
This method performs a blocking selection operation. It returns only after at least one channel is selected, this selector's {@link #wakeup wakeup} method is invoked, the currentthread is interrupted, or the given timeout period expires, whichever comes first.
This method does not offer real-time guarantees: It schedules the timeout as if by invoking the {@link Object#wait(long)} method.
@param timeout If positive, block for up to timeoutmilliseconds, more or less, while waiting for a channel to become ready; if zero, block indefinitely; must not be negative @return The number of keys, possibly zero,whose ready-operation sets were updated @throws IOException If an I/O error occurs @throws ClosedSelectorException If this selector is closed @throws IllegalArgumentException If the value of the timeout argument is negative

    private class Worker implements Runnable {
        public void run() {
            Selector selector = DatagramAcceptorDelegate.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();


                    if (nKeys > 0) {
                        processReadySessions(selector.selectedKeys());

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    private class Worker implements Runnable {
        public void run() {
            Selector selector = SocketIoProcessor.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select(1000);
                    doAddNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {
                        process(selector.selectedKeys());

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    private class Worker implements Runnable {
        public void run() {
            Selector selector = DatagramConnectorDelegate.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {

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                            Log.ignore(e);
                        }
                    }
                        
                    long before=now;
                    int selected=selector.select(wait);
                    now = System.currentTimeMillis();
                    _idleTimeout.setNow(now);
                    _retryTimeout.setNow(now);
                    _selects++;

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                synchronized (selectorGuard) {
                    // This empty synchronization block prevents the selector
                    // from acquiring its lock.
                }
                try {
                    int selectedKeyCount = selector.select(500);
                    if (selectedKeyCount > 0) {
                        processSelectedKeys(selector.selectedKeys());
                    }


                    // Exit the loop when there's nothing to handle.

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                    // from acquiring its lock.
                selectorGuard.writeLock().unlock();
            }


            try {
                int selectedKeyCount = selector.select(500);


                processRegisterTaskQueue();
                processWriteTaskQueue();


                if (selectedKeyCount > 0) {

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                    // from acquiring its lock.
                selectorGuard.writeLock().unlock();
            }


            try {
                int selectedKeyCount = selector.select(500);


                processRegisterTaskQueue();
                processWriteTaskQueue();


                if (selectedKeyCount > 0) {

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                        in_channel.configureBlocking(false);
                        out_channel.configureBlocking(false);
                        in_channel.register(sel, SelectionKey.OP_READ);
                        out_channel.register(sel, SelectionKey.OP_READ);
                        
                        while (sel.select() > 0) {
                            ready_keys=sel.selectedKeys();
                            for (Iterator it=ready_keys.iterator(); it.hasNext();) {
                                key=(SelectionKey) it.next();
                                it.remove(); // remove current entry (why ?)
                                tmp=(SocketChannel) key.channel();

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      }
    
    harness.checkPoint("select");
    try
      {
        int ret = sel.select(100);
        harness.check(ret, 0);
      }
    catch (IOException ioe)
      {
        harness.fail("select");

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            long lastConnectTimeoutCheckTimeNanos = System.nanoTime();
            for (;;) {
                wakenUp.set(false);


                try {
                    int selectedKeyCount = selector.select(500);


                    // 'wakenUp.compareAndSet(false, true)' is always evaluated
                    // before calling 'selector.wakeup()' to reduce the wake-up
                    // overhead. (Selector.wakeup() is an expensive operation.)
                    //

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