Re: [mdr-users] MDR and Swing

Hi Dimitrios,
I need to see the DebugException which are thrown (and maybe it can be some bug of MDR or an issue for Martin Matula). The possible problem could be not calling shutdown() method on MDRManager (or MDRrepository, I'm not sure) otherwise I need to see the log or the source code.

Maybe you can also try some newer version of MDR (I don't know which version do you use).

Regards
Jarda

>  Hi Jarda,
>  
>  Thanks for your response. Skipping transactions solved the threading 
>  problem (and I really thank you for that!). However, (as usually) every 
>  solution creates another problem :) Now my repository gets corrupted 
>  everly time so between two successive "runs" of my program, I have to 
>  delete the btd, btx files or else I get a lot of "DebugExceptions". If I 
>  turn transactions on again, everything (except for the threads of 
>  course) works fine. Any ideas on how to overcome this?
>  
>  Cheers,
>  Dimitrios
>  
>  Jaroslav Drazan wrote:
>  
>  > Hi Dimitrios,
>  > the possible problem can be MDR transactions - if you start a 
>  > transaction from some threadXXX, you cannot access the repository from 
>  > another thread (if you do so, the another thread waits until the 
>  > threadXXX does not finish the transaction).
>  >
>  > We had the similar problem - we started a transaction from the main 
>  > thread and when we accessed the repository frm the AWT-thread - the 
>  > application freezed. The possible solution in our case were to access 
>  > the repository from just one thread or not to use MDR transaction.
>  >
>  > We have used Eclipse and swing as well and everything (after solving 
>  > the problem mentioned above) works fine.
>  >
>  > Regards
>  > Jarda
>  >
>  >>  Hi Martin,
>  >>  
>  >>  Thanks for your reply. Yes, the application freezes forever. I have 
>  >>  looked into it and managed to get somehow deeper into the problem. I 
>  >>  believe it has to do with threads and it is not limited to Swing only.
>  >>  
>  >>  For example when I populate a RefPackage (e.g. refPackage) in the 
>  >> main  method of my (Swing) program and try to access it on a button 
>  >> click  event - AbstractAction.perform() -, since the perform() 
>  >> function is run  by the dispatcher in a different thread, I get no 
>  >> response (the code  freezes at the statement I try to access e.g. 
>  >> refPackage.refAllClasses()  and the statement does not return!). 
>  >> However, if I populate refPackage  inside the perform() method (so 
>  >> that it is in the same thread with the  accessing code), everything 
>  >> works fine. Any ideas?
>  >>  
>  >>  Cheers,
>  >>  Dimitrios
>  >>  
>  >>  Martin Matula wrote:
>  >>  
>  >>  > Hi Dimitrios,
>  >>  > what kind of freezing do you mean? Does your application freeze 
>  >> forever?
>  >>  > Martin
>  >>  >
>  >>  > Dimitrios Kolovos wrote:
>  >>  >
>  >>  >> I am working on a small utility that displays and MDR model in a 
>  >>  >> JTree. In generally I face a lot of execution "freezing" issues 
>  >> and I  >> often have to call SwingUtilities.invokeLater() to prevent 
>  >> execution  >> from freezing where MDR is involved. Does anyone else 
>  >> have similar  >> (bad) experience (and hopefully come up with a 
>  >> solution) with MDR and  >> JTree (or Swing in general)?
>  >>  >>
>  >>  >> Cheers,
>  >>  >> Dimitrios
>  >>  >>
>  >>  >> P.S. I use Eclipse for Java development in case that makes a 
>  >> difference.
>  >>  >
>  >>  >
>  >>  >
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