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

java.nio.channels.Selector.keys()
Returns this selector's key set.
The key set is not directly modifiable. A key is removed only after it has been cancelled and its channel has been deregistered. Any attempt to modify the key set will cause an {@link UnsupportedOperationException} to be thrown.
The key set is not thread-safe.
@return This selector's key set @throws ClosedSelectorException If this selector is closed

                // Exit the loop when there's nothing to handle.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when
                // connections are registered in a one-by-one manner instead of
                // concurrent manner.
                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {

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                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {
                                started = false;
                                try {
                                    selector.close();
                                } catch (IOException e) {
                                    logger.warn(

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                // Exit the loop when there's nothing to handle.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when
                // connections are registered in a one-by-one manner instead of
                // concurrent manner.
                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {

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                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {
                                started = false;
                                try {
                                    selector.close();
                                } catch (IOException e) {
                                    logger.warn(

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    protected void socketTimeouts() {
        long now = System.currentTimeMillis();
        if ( (now-lastCheck) < getSelectorTimeout() ) return;
        //timeout
        Selector tmpsel = selector;
        Set keys =  (isListening()&&tmpsel!=null)?tmpsel.keys():null;
        if ( keys == null ) return;
        for (Iterator iter = keys.iterator(); iter.hasNext(); ) {
            SelectionKey key = (SelectionKey) iter.next();
            try {
//                if (key.interestOps() == SelectionKey.OP_READ) {

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                    // Handle connection timeout every 0.5 seconds approximately.
                    long currentTimeNanos = System.nanoTime();
                    if (currentTimeNanos - lastConnectTimeoutCheckTimeNanos >= 500 * 1000000L) {
                        lastConnectTimeoutCheckTimeNanos = currentTimeNanos;
                        processConnectTimeout(selector.keys(), currentTimeNanos);
                    }


                    // Exit the loop when there's nothing to handle.
                    // The shutdown flag is used to delay the shutdown of this
                    // loop to avoid excessive Selector creation when

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                    // Exit the loop when there's nothing to handle.
                    // The shutdown flag is used to delay the shutdown of this
                    // loop to avoid excessive Selector creation when
                    // connection attempts are made in a one-by-one manner
                    // instead of concurrent manner.
                    if (selector.keys().isEmpty()) {
                        if (shutdown ||
                            bossExecutor instanceof ExecutorService && ((ExecutorService) bossExecutor).isShutdown()) {


                            synchronized (startStopLock) {
                                if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {

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                    if (selector.keys().isEmpty()) {
                        if (shutdown ||
                            bossExecutor instanceof ExecutorService && ((ExecutorService) bossExecutor).isShutdown()) {


                            synchronized (startStopLock) {
                                if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {
                                    started = false;
                                    try {
                                        selector.close();
                                    } catch (IOException e) {
                                        logger.warn(

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                // Exit the loop when there's nothing to handle.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when
                // connections are registered in a one-by-one manner instead of
                // concurrent manner.
                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {

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                if (selector.keys().isEmpty()) {
                    if (shutdown ||
                        executor instanceof ExecutorService && ((ExecutorService) executor).isShutdown()) {


                        synchronized (startStopLock) {
                            if (registerTaskQueue.isEmpty() && selector.keys().isEmpty()) {
                                started = false;
                                try {
                                    selector.close();
                                } catch (IOException e) {
                                    logger.warn(

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