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

                // key set is empty.
                // 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("Failed to close a selector.",

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  sb.append ("Status of selector at: ");
  sb.append (new Date ());
  sb.append ("<p>\n");
  Selector sel = con.getSelector ();
  appendKeys (sb, sel.selectedKeys (), "Selected key");
  appendKeys (sb, sel.keys (), "registered key");
    }


    private void appendKeys (StringBuilder sb, 
           Set<SelectionKey> sks, String header) {
  sb.append (HtmlPage.getTableHeader (100, 1));

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

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        }
        SocketChannel connectedChannel = null;


        connect:
        while (true) {
            if (selector.keys().isEmpty()) {
                throw new IOException("Connection failed for " + hostString +
                        ": " + exceptions);
            }
            selector.select();  // you can add a timeout parameter in millseconds
            Set<SelectionKey> keys = selector.selectedKeys();

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        }


        assert connectedChannel != null;
        
        // Close the channels that didn't connect
        for (SelectionKey key : selector.keys()) {
            Channel channel = key.channel();
            if (channel != connectedChannel)
                channel.close();
        }

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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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    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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                    }


                    flushSessions();
                    cancelKeys();


                    if (selector.keys().isEmpty()) {
                        synchronized (DatagramAcceptorDelegate.this) {
                            if (selector.keys().isEmpty()
                                    && registerQueue.isEmpty()
                                    && cancelQueue.isEmpty()) {
                                worker = null;

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