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

                    }


                    processRegisterTaskQueue();


                    if (selectedKeyCount > 0) {
                        processSelectedKeys(selector.selectedKeys());
                    }


                    // Handle connection timeout every 0.5 seconds approximately.
                    long currentTimeNanos = System.nanoTime();
                    if (currentTimeNanos - lastConnectTimeoutCheckTimeNanos >= 500 * 1000000L) {

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                }


                cancelledKeys = 0;
                processRegisterTaskQueue();
                processWriteTaskQueue();
                processSelectedKeys(selector.selectedKeys());


                // 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

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                }


                cancelledKeys = 0;
                processRegisterTaskQueue();
                processWriteTaskQueue();
                processSelectedKeys(selector.selectedKeys());


                // Exit the loop when there's nothing to handle (the registered
                // key set is empty.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when

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                        // Reduce the time remaining by the elapsed time and
                        timeRemaining = timeRemaining.subtract(elapsed);
                        startTime = now;
                    }
                } else if (keys == 1) {
                    Set selectedKeys = selector.selectedKeys();
                    if (selectedKeys.contains(key)) {
                        connected = true;
                    } else {
                        throw new IllegalStateException(
                                "Expected selected keys to contain " + key +

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    private void addStatus (StringBuilder sb) {
  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) {

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            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();
            if (keys.isEmpty()) {
                throw new IOException("Selection keys unexpectedly empty for " +
                        hostString + "[exceptions: " + exceptions + "]");
            }
            for (SelectionKey key : keys) {

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          client.connected_.keyFor(selector).interestOps(SelectionKey.OP_WRITE);
        }
      }


      // handle selectable I/O
      for (Iterator<SelectionKey> i = selector.selectedKeys().iterator();
           i.hasNext();) {
        SelectionKey key = i.next();
        SocketChannel channel = (SocketChannel) key.channel();
        i.remove();

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      {


        // Waiting for events
        selector.select();
        // Get keys
        Set keys = selector.selectedKeys();


        Iterator iter = keys.iterator();


        // For each keys...
        while (iter.hasNext())

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                    int nKeys = selector.select();


                    registerNew();


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


                    flushSessions();
                    cancelKeys();

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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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