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Groups > comp.lang.java.gui > #5081

Re: [ANN] java.awt.SecondaryLoop

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On 03/06/2012 06:30 AM, Steven Simpson wrote:
> On 06/03/12 01:54, Jeff Higgins wrote:
>> <http://docs.oracle.com/javase/7/docs/api/java/awt/SecondaryLoop.html>
>> <http://sellmic.com/blog/2012/02/29/hidden-java-7-features-secondaryloop/>
>>
>
> How will that work? I suppose that the enter() call sets off a new EDT,
> and then blocks until exit() is called. Then it tries to claim back
> responsibility for event dispatch as soon as the current EDT completes
> an event. Each time the current EDT completes an event, it checks for
> completed SecondaryLoops, i.e. one which has been exit()ed. At that
> point, it wakes the thread blocked on that SL, and terminates, allowing
> the other thread to take over as EDT.
>
> Hmm, no it doesn't work like that. Try the progam below. It creates two
> buttons; we'll call them A and B. When you click A, it greys out for 5
> seconds; B for 10 seconds. If you click A then B before A is restored, A
> has to wait for B to complete. It seems that A's SL simply re-enters the
> event loop, so the second click is handled by that invocation, and must
> re-enter the loop again. They can only unwind in reverse order.
>
> Am I doing it wrong?

I haven't determined for sure that this is apropos.
<http://mail.openjdk.java.net/pipermail/awt-dev/2010-August/001345.html>
<http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6980209>

>
> import javax.swing.JFrame;
> import javax.swing.JButton;
> import javax.swing.SwingUtilities;
> import java.awt.SecondaryLoop;
> import java.awt.event.ActionListener;
> import java.awt.event.ActionEvent;
> import java.awt.Toolkit;
> import java.awt.EventQueue;
> import java.awt.GridBagConstraints;
> import java.awt.GridBagLayout;
> import java.awt.Container;
>
> public class TestSL {
> private static JFrame frame;
>
> private static JButton makeButton(String text, final int delay) {
> final JButton button = new JButton(text);
> ActionListener al = new ActionListener() {
> public void actionPerformed(ActionEvent e) {
> Toolkit tk = Toolkit.getDefaultToolkit();
> EventQueue eq = tk.getSystemEventQueue();
> SecondaryLoop loop = eq.createSecondaryLoop();
>
> button.setEnabled(false);
> new Sleeper(delay, loop).start();
> loop.enter();
> button.setEnabled(true);
> }
> };
> button.addActionListener(al);
> return button;
> }
>
> private static void init() {
> frame = new JFrame("Boo");
> frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>
> Container content = frame.getContentPane();
> content.setLayout(new GridBagLayout());
> GridBagConstraints c = new GridBagConstraints();
> content.add(makeButton("5 seconds", 5), c);
> content.add(makeButton("10 seconds", 10), c);
> frame.pack();
> frame.setVisible(true);
> }
>
> public static void main(String[] args) throws Exception {
> Runnable action = new Runnable() {
> public void run() {
> init();
> }
> };
>
> SwingUtilities.invokeLater(action);
> }
>
> private static class Sleeper extends Thread {
> private final int seconds;
> private final SecondaryLoop loop;
>
> public Sleeper(int seconds, SecondaryLoop loop) {
> this.seconds = seconds;
> this.loop = loop;
> }
>
> public void run() {
> try {
> Thread.sleep(1000 * seconds);
> } catch (InterruptedException ex) {
> // Ignore.
> }
> loop.exit();
> }
> }
> }
>
>
>

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Thread

[ANN] java.awt.SecondaryLoop Jeff Higgins <jeff@invalid.invalid> - 2012-03-05 20:54 -0500
  Re: [ANN] java.awt.SecondaryLoop markspace <-@.> - 2012-03-05 23:19 -0800
  Re: [ANN] java.awt.SecondaryLoop Steven Simpson <ss@domain.invalid> - 2012-03-06 11:30 +0000
    Re: [ANN] java.awt.SecondaryLoop markspace <-@.> - 2012-03-06 08:28 -0800
      Re: [ANN] java.awt.SecondaryLoop Steven Simpson <ss@domain.invalid> - 2012-03-06 17:00 +0000
        Re: [ANN] java.awt.SecondaryLoop markspace <-@.> - 2012-03-06 10:23 -0800
    Re: [ANN] java.awt.SecondaryLoop Jeff Higgins <jeff@invalid.invalid> - 2012-03-06 12:07 -0500
      Re: [ANN] java.awt.SecondaryLoop markspace <-@.> - 2012-03-06 10:25 -0800

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