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


                tmpKey = null;
                tmpKey = channel.register(readSelector, SelectionKey.OP_READ);
                tmpKey.interestOps(tmpKey.interestOps() | SelectionKey.OP_READ);


                int code = readSelector.select(readTimeout);
                tmpKey.interestOps(tmpKey.interestOps() &
                    (~SelectionKey.OP_READ));


                if (code == 0) {
                    return 0; // Return on the main Selector and try again.

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        int selectRetries = _networkManager.getSipLinkTimeoutRetries();
        long waitTime = _networkManager.getSipLinkTimeout();


        try {
            while ((selectRetries > 0) &&
                    ((sel = connectSel.select(waitTime)) < 1)) {
                selectRetries--;


                if (sel < 0) {
                    //
                    // something really wrong !

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                int sel;
                int selectRetries = 0;
                long waitTime = _networkManager.getSipLinkTimeout();


                try {
                    while ((sel = writeSel.select(waitTime)) < 1) {
                        selectRetries++;


                        int left = message.remaining();


                        if (sel < 0) {

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            Selector sel = NativeSelectorProvider.getInstance().openSelector();
            channel.configureBlocking(false);
            channel.socket().bind(address);
            channel.register(sel, SelectionKey.OP_ACCEPT, new ServerActor(channel, sel));


            while (sel.select() > 0) {
                Set<SelectionKey> keys = sel.selectedKeys();
                for (SelectionKey k : keys) {
                    Actor a = (Actor) k.attachment();
                    if (!a.rxready()) {
                        k.cancel();

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      logger.l1("We are listening on " + bind.getHostString() + ":"
          + bind.getPort());
      Selector selector = Selector.open();
      server.register(selector, server.validOps());
      while (true) {
        selector.select();
        for (SelectionKey key : selector.selectedKeys()) {
          try {
            ServerSocketChannel channel = (ServerSocketChannel) key
                .channel();
            if (key.isValid()) {

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                start = System.currentTimeMillis();
            }
            sender.setMessage(buf);
            int selectedKeys = 0;
            try {
                selectedKeys = selector.select(0);
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }

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                start = System.currentTimeMillis();
            }
            sender.setMessage(buf);
            int selectedKeys = 0;
            try {
                selectedKeys = selector.select(0);
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }

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    private class Worker implements Runnable {
        public void run() {
            Selector selector = DatagramAcceptorDelegate.this.getSelector();
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();


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

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    private class Worker implements Runnable {
        public void run() {
            Selector selector = getSelector();
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {

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    private class Worker implements Runnable {
        public void run() {
            Selector selector = getSelector();
            for (;;) {
                try {
                    int nKeys = selector.select(1000);
                    doAddNew();
                    doUpdateTrafficMask();


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

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