Re: [aspectj-users] Saving data at program termination

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

I don't see anywhere in your code where
data is initialized. Have you checked whether the before advice is being
called and the shutdown hook registered? The after advice is redundant,
just put the logic in the run() method of the hook.

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal) 
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

"Darkemon" <darkemon@xxxxxxxx>
Sent by: aspectj-users-bounces@xxxxxxxxxxx

09/12/2006 14:15

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Subject	[aspectj-users] Saving data at program termination

Hi,
I would like to advise a program termination
to write (or show) collected data in a file when the program terminate.
So that, the target program have finished all its method executions and
not only that executed inside the main. I'am referring at application with
threads or gui.

I tried to use an execution pointcut on a generic ShutdownThread.run()
method and write data with a after advice like that below, but when save
data there is an "Exception in thread "Thread-0" java.lang.NullPointerException".
 I think that the "data" object life end out the main...
but how can i save the data in this way?



aspect MyAspect 
{
      DataStructure data; // this collected information
on method executions of weaved target program

      pointcut mainExec() : execution(* *.main(..));
      

      before() : mainExec()
      {
           Runtime.getRuntime().addShutdownHook(new
ShutdownThread());   
      }


      after() : execution(void ShutdownThread.run())
      {
           
data.write(); // where is my data!?
             ...
      }
}

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