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

                            Log.ignore(e);
                        }
                    }
                        
                    long before=now;
                    int selected=selector.select(wait);
                    now = System.currentTimeMillis();
                    _idleTimeout.setNow(now);
                    _retryTimeout.setNow(now);
                    _selects++;

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            return;
          }
          tmpKey = selectableChannel.register(writeSelector,
              SelectionKey.OP_WRITE);
        }
        if (writeSelector.select(1000) == 0) {
          attempts++;
          if (attempts > 2) {
            return;
          }
        } else {

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              continue;
            }
            tmpKey = channel.register(writeSelector,
                SelectionKey.OP_WRITE);
          }
          if (writeSelector.select(1000) == 0) {
            if (attempts > 2) {
              throw new IOException("Client disconnected");
            }
          }
        }

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    SelectionKey tmpKey = null;
    try {
      if (this.selectableChannel.isOpen()) {
        tmpKey = this.selectableChannel.register(readSelector, 0);
        tmpKey.interestOps(tmpKey.interestOps() | SelectionKey.OP_READ);
        int code = readSelector.select(500);
        tmpKey
            .interestOps(tmpKey.interestOps()
                & ~SelectionKey.OP_READ);
        if (code > 0) {
          do {

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                                } else if ((operations & SelectionKey.OP_WRITE) != 0) {
                                    writeWouldBlock();
                                }
                            }
                        } else {
                            result[0] = selector.select();
                        }
                    } catch (IOException ioe) {
                        throw runtime.newRuntimeError("Error with selector: " + ioe.getMessage());
                    }
                }

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            // this may block for a long time, upon return the
            // selected set contains keys of the ready channels
            try {
                events();
                socketTimeouts();
                int n = selector.select(getSelectorTimeout());
                if (n == 0) {
                    //there is a good chance that we got here
                    //because the TcpReplicationThread called
                    //selector wakeup().
                    //if that happens, we must ensure that that

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


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

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


                    registerNew();


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

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        public void run() {
            Selector selector = SocketConnector.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select(1000);


                    registerNew();


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

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