Re: [aspectj-users] Question on Tracing Aspect

[Manjula Jayaraman <manjuv123@xxxxxxxxx>]

Thanks Matthew. I used staticinitialization and it
worked for me. 

Another question is that is there a dynamic waying of
turning off aspects J in the production. For example,
i've an aspect EspressoTraceAspect for tracing. If i
want to disable it, i've to change the pointcut and
recompile and redeploy that in the production. Is
there another way without going through this
compilation?

Thanks in advance,
Manjula


--- Matthew Webster <matthew_webster@xxxxxxxxxx>
wrote:
> 
> 
> 
> 
> Manjula,
> 
> Please see my append to aspectj-dev for a good
> tracing aspect example:
>
http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg01261.html.
> If you want
> per-thread tracing i.e. one logger per thread
> instead of the usual one
> logger per class you will need to make your Logger a
> ThreadLocal. Only do
> this if you want to control tracing on a per-thread
> basis because most
> implementations allow you to distinguish outputs
> produced on different
> threads.
> 
> 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/
> 
> Manjula Jayaraman <manjuv123@xxxxxxxxx>@eclipse.org
> on 03/05/2005 23:27:04
> 
> Please respond to aspectj-users@xxxxxxxxxxx
> 
> Sent by:    aspectj-users-bounces@xxxxxxxxxxx
> 
> 
> To:    aspectj-users@xxxxxxxxxxx
> cc:
> Subject:    [aspectj-users] Question on Tracing
> Aspect
> 
> 
> Hi All,
> 
> I'm new to Aspect J. I wrote my first aspect using
> Aspect J for tracing. I would like to log a message
> upon entry and exit of all the methods in ALL the
> packages in my project.
> 
> I've a class called EspressoLog as follows:
> 
> public class EspressoTrace {
> 
>         private static Logger logger = null;
> 
>         public static void initLogger(Logger l) {
>                 logger = l;
>         }
>         public static void traceEntry(String
> message)
> {
>                 logger.debug("Entering : " +
> message);
>         }
> 
>         public static void traceExit(String message)
> {
>                 logger.debug("Exiting : " +
> message);
>         }
> }
> 
> I've another class as follows
> 
> aspect EspressoTraceAspect {
> 
>         private Logger logger;
> 
> 
>         pointcut traceCall() : target(*) &&
> execution(public *
> com.apple.ist.espresso.xmlparser..*(..));
> 
>         before() : traceCall() {
> 
>
EspressoTrace.initLogger(EspressoLogger.getLogger(thisJoinPointStaticPart.getSignature().getName().getClass()));
> 
>                 EspressoTrace.traceEntry("" +
> thisJoinPointStaticPart.getSignature().getName());
>         }
> 
>         after() : traceCall() {
>                 EspressoTrace.traceExit("" +
> thisJoinPointStaticPart.getSignature().getName());
>         }
> 
> }
> 
> 
> My problem is that i'm calling initLogger every time
> in before method of my EspressoTraceAspect. But the
> efficient way to do this is to call only once per
> invocation of a class not before the invocation of
> each method in that class. how can i achieve this?
> 
> 
> Also, if the same class is called through multiple
> threads having the Logger attribute as static in
> EspressoTraceAspect would not help. How should i
> handle that?
> 
> Thanks for any input in advance,
> Manjula
> 
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