Well, your example is simplified, as you say, so I can't tell with
certainty. But it might be that you're under the impression that
locating the method callReteLoop() in a subclass of Thread
automatically means that any calls to it will return immediately while
the method runs in some other concurrent process. This is not how it
works. Only code in the run() method of a Thread class will be run in
a new thread, and then only by calling the start() method of that same
object; start() calls run() in a new thread. Your GUI is freezing
because instead you're calling runUntilhalt() directly in the
event-handling thread, which is therefore busy until the method
returns.
Here's a very simple version that uses a anonymous inner class (the
run() method will need a JessException try/catch block which I've
omitted here.)
class JessGui extends JFrame {
...
if (button1.clicked())
new Thread() { public void run() { rete.runUntilHalt(); }}.start();
When the button is clicked, the engine runs in a new Thread. As I said,
this is a very simple version. If you want to do fancier things,
you're probably going to need to learn more about how Threads work;the
Java tutorial at java.sun.com is actually quite nice and has a good
Threads section.
I think S.S.Ozsariyildiz wrote:
>
> Hi,
>
> The problem is when I call the run-until-halt command is waits and all
> the swing based gui's are frozen. (With out run-until-halt every thing
> works fine also with run it works) What may cause the problem ant Ideas?
> Are there any examples or explanations how to use ACTIVATION LOCK in
> Rete?
>
> The simplified class structure looks like this.
>
> class mainApp {
> JessGui j1;
> App1 a1;
> ......
> }
>
> class JessGui extends JFrame {
> JessThread jt1;
> ......
> if (button1 clicked) callReteLoop();
> // this locks the gui. It does not let the gui to update though its not
> the JessThread.
> // it also locks the App1 no updates there as well.
> ......
> }
>
> JessThread extends Thread {
> static Rete rete;
> static initJess(){}
> ......
> callReteLoop(){
> rete.runUntilHalt();
> }
> }
>
> App1 extends Thread {
> ....
> //some where I access to the jess engine by using the static member
> in JessThread
> putInstancetoJess(){
> JessThread.rete.executeCommand(....)
> }
> }
>
> thanks.
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
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