Worker Thread and Helper Thread for Gauge updates

Question

Hi
I know that in the Smart Ticket sample application there is an example with the implematation of "Each worker thread also has a helper thread that displays an animated gauge to indicate the progress of the worker thread".
But i can't find the sample on java.sun.com anymore..:-(. Do you have the source code of smart ticket or even an example of the helper thread implemetation. The worker thread i have already implementated.
Thanx
Michael

Answer 1

Here's a simple outline of what I do. This has been drastically stipped down from my actual code as I use teh message for all kinds of things incluing requests on a queue to the worker and resposes back. So in the real code I also have a success flag, a command type, an argument object and a result object with get and set methods for all of them.
1) define an interface that the GUI code can implement and pass a reference to the worker which stores it in myTarget.
interface MessageTarget
     void postMessage(Message m);
     void runMessage(Message m);
}2) define a message class
class Message implements Runnable
     Object data;
     MessageTarget target;
     Message(MessageTarget target, Object data)
          this.target = target;
          this.data = data;
     public void run(){target.runMessage(this);}
     public Object getData(){return data;}
     public void postMessage(){target.postMessage(this);}
}3) implement the MessageTarget interface in the GUI
// put a response from the database onto the swing queue
public void postMessage(Message r)
     javax.swing.SwingUtilities.invokeLater((Runnable)r);
// process messages
public void runMessage(Message m)
     Object data = m.getData();
}4) post messages back from the worker
       new Message(myTarget,myData).post();