Re: [aspectj-users] Trace method calls with around advice

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

Martin,

If you value performance, which most
people do when tracing, then you will not use around advice. Entry/exit/exception
events generated by before/after returning/after throwing advice easily
be correlated offline. If you really need to do it online use a ThreadLocal
counter.

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/

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Subject:        [aspectj-users] Trace method calls with around advice


Hello!

I want to trace method calls using an around advice. It is important
that I can associate method calls and their return value and a thrown
exception, respectively. So, using before and after advices does not
meet my requirements (without using the stack information).

An advice like the following could do the job:


   Object around() throws Exception: aCall() {
       
       logger.trace("Before proceed: " + thisJoinPoint);
       
       int id = Manager.record(thisJoinPoint);

       Object returned = null;
       
       try {
           returned = proceed();
       } catch (Exception e) {
           logger.trace("After proceed: " + thisJoinPoint);
           logger.trace("Threw an exception: " + e);
           Manager.recordException(id, e);
           throw e;
       }

       logger.trace("After proceed: " + thisJoinPoint);
       logger.trace("Returned normally with " + returned);

       Manager.record(id, returned);
     
       return returned;
   }


Unfortunately, that advice does not work. Using an RuntimeException will
not handle method with checked exceptions.

Is there any way to do this job using AspectJ?

Regards,
   Martin
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