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

java.nio.channels.Selector.selectedKeys()
Returns this selector's selected-key set.
Keys may be removed from, but not directly added to, the selected-key set. Any attempt to add an object to the key set will cause an {@link UnsupportedOperationException} to be thrown.
The selected-key set is not thread-safe.
@return This selector's selected-key set @throws ClosedSelectorException If this selector is closed

                    int nKeys = selector.select(1000);
                    doAddNew();
                    doUpdateTrafficMask();


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


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

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                    int nKeys = selector.select();


                    registerNew();


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


                    cancelKeys();


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

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                    int nKeys = selector.select(1000);


                    registerNew();


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


                    processTimedOutSessions(selector.keys());


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

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                    registerNew();
                    doUpdateTrafficMask();


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


                    flushSessions();
                    cancelKeys();

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                        //interestOps method
//                    }
                    continue; // nothing to do
                }
                // get an iterator over the set of selected keys
                Iterator<SelectionKey> it = selector.selectedKeys().iterator();
                // look at each key in the selected set
                while (it!=null && it.hasNext()) {
                    SelectionKey key = it.next();
                    // Is a new connection coming in?
                    if (key.isAcceptable()) {

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            if (selectedKeys == 0) {
                continue;
            }


            Iterator<SelectionKey> it = selector.selectedKeys().iterator();
            while (it.hasNext()) {
                SelectionKey sk = it.next();
                it.remove();
                try {
                    int readyOps = sk.readyOps();

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            int select = selector.select(1000 * 10); // 10s
            if (select > 0) {
                System.out.println("select return: " + select
                        + " events ; current connection per ip: " + currentConnectionPerIP);
                Set<SelectionKey> selectedKeys = selector.selectedKeys();
                Iterator<SelectionKey> it = selectedKeys.iterator();


                while (it.hasNext()) {
                    SelectionKey key = it.next();
                    if (key.isConnectable()) {

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        while (true) {
            int select = selector.select();
            D("selec return " + select);
            if (select > 0) {
                Set<SelectionKey> selectedKeys = selector.selectedKeys();
                Iterator<SelectionKey> it = selectedKeys.iterator();
                while (it.hasNext()) {
                    SelectionKey key = it.next();
                    if (key.isConnectable()) {
                        SocketChannel ch = (SocketChannel) key.channel();

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            int n = selector.select();
            if (n == 0) {
                continue;  // nothing to do
            }
            // get an iterator over the set of selected keys
            Iterator it = selector.selectedKeys().iterator();
            // look at each key in the selected set
            while (it.hasNext()) {
                SelectionKey key = (SelectionKey) it.next();
                // Is a new connection coming in?
                if (key.isAcceptable()) {

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                } catch (IOException ignore) {
                    n = 0;
                    ignore.printStackTrace();
                }
                if (n > 0) {
                    Iterator<SelectionKey> it = sel.selectedKeys().iterator();
                    while (it.hasNext()) {
                        SelectionKey sk = it.next();
                        it.remove();
                        Object o = sk.attachment();
                        sk.interestOps(0);

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