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

                    processTimedOutSessions(selector.keys());


                    if (selector.keys().isEmpty()) {
                        if (System.currentTimeMillis() - lastActive > workerTimeout * 1000L) {
                            synchronized (lock) {
                                if (selector.keys().isEmpty()
                                        && connectQueue.isEmpty()) {
                                    worker = null;
                                    try {
                                        selector.close();
                                    } catch (IOException e) {

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

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    private void closeSelector() throws IOException {
        Selector selector = this.selector;
        this.selector = null;
        if (selector==null) return;
        try {
            Iterator<SelectionKey> it = selector.keys().iterator();
            // look at each key in the selected set
            while (it.hasNext()) {
                SelectionKey key = it.next();
                key.channel().close();
                key.attach(null);

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

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    private void closeSelector() throws IOException {
        Selector selector = this.selector;
        this.selector = null;
        if (selector==null) return;
        try {
            Iterator<SelectionKey> it = selector.keys().iterator();
            // look at each key in the selected set
            while (it.hasNext()) {
                SelectionKey key = it.next();
                key.channel().close();
                key.attach(null);

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                    doFlush();
                    doRemove();
                    notifyIdleness();


                    if (selector.keys().isEmpty()) {
                        synchronized (lock) {
                            if (selector.keys().isEmpty()
                                    && newSessions.isEmpty()) {
                                worker = null;

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                    doRemove();
                    notifyIdleness();


                    if (selector.keys().isEmpty()) {
                        synchronized (lock) {
                            if (selector.keys().isEmpty()
                                    && newSessions.isEmpty()) {
                                worker = null;


                                try {
                                    selector.close();

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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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                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();

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