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

            Thread.currentThread().setName(SocketIoProcessor.this.threadName);


            Selector selector = SocketIoProcessor.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select(1000);
                    doAddNew();
                    doUpdateTrafficMask();


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

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            Thread.currentThread().setName(SocketConnector.this.threadName);


            Selector selector = SocketConnector.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select(1000);


                    registerNew();


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

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            Thread.currentThread().setName("DatagramAcceptor-" + id);


            Selector selector = DatagramAcceptorDelegate.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();


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

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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());
                }


                if (selector.keys().isEmpty()) {

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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());
                    }


                    if (selector.keys().isEmpty()) {

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        while (doListen) {
            // this may block for a long time, upon return the
            // selected set contains keys of the ready channels
            try {


                int n = selector.select(tcpSelectorTimeout);
                if (n == 0) {
                    continue; // nothing to do
                }
                // get an iterator over the set of selected keys
                Iterator it = selector.selectedKeys().iterator();

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


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


                // Wake up immediately in the next turn if someone might
                // have waken up the selector between 'wakenUp.set(false)'
                // and 'selector.select(...)'.
                if (wakenUp.get()) {

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            Selector selector = this.selector;
            for (;;) {
                wakenUp.set(false);


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


                    // Wake up immediately in the next turn if someone might
                    // have waken up the selector between 'wakenUp.set(false)'
                    // and 'selector.select(...)'.
                    if (wakenUp.get()) {

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                            }
                            key = getIOChannel().register(selector, hsStatus);
                        } else {
                            key.interestOps(hsStatus);
                        }
                        int keyCount = selector.select(timeout);
                        if (keyCount == 0 && ((System.currentTimeMillis()-now) >= timeout)) {
                            throw new SocketTimeoutException("Handshake operation timed out.");
                        }
                        isReadable = key.isReadable();
                        isWriteable = key.isWritable();

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        public void run() {
            Selector selector = SocketConnector.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select(1000);


                    registerNew();


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

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