Re: [aspectj-users] Question on Tracing Aspect

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Re: [aspectj-users] Question on Tracing Aspect

From: Manjula Jayaraman <manjuv123@xxxxxxxxx>
Date: Wed, 11 May 2005 18:34:20 -0700 (PDT)
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Thanks very much Matthew for always responding
promptly. I've deployed AspectJ for my simple
requirement and it's working fine.

Manjula

--- Matthew Webster <matthew_webster@xxxxxxxxxx>
wrote:

> 
> 
> 
> 
> Manjula,
> 
> Use
>
thisJoinPointStaticPart.getSignature().getDeclaringType()
> in advice for
> the staticinitialization join point.
> 
> 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 09/05/2005 23:42:39
> 
> Please respond to aspectj-users@xxxxxxxxxxx
> 
> Sent by:    aspectj-users-bounces@xxxxxxxxxxx
> 
> 
> To:    aspectj-users@xxxxxxxxxxx
> cc:
> Subject:    Re: [aspectj-users] Question on Tracing
> Aspect
> 
> 
> Thanks Matthew.
> 
> Actually, my logger takes the "Class" as an input as
> below:
> 
> public class EspressoLogger {
> 
>              public static Logger getLogger(Class
> userClass) {
>                          ......
>              }
> 
> }
> 
> I will call this as:
> 
> EspressoLogger.getLogger(Test.class);
> 
> So for each class, how do i do that?
> 
> Thanks,
> Manjula
> 
> --- Matthew Webster <matthew_webster@xxxxxxxxxx>
> wrote:
> 
> >
> >
> >
> >
> > Manjula,
> >
> > Use either
> >
>
thisJoinPointStaticPart.getSignature().getDeclaringType()
> > or
> >
>
thisJoinPointStaticPart.getSignature().getDeclaringTypeName().
> > I think you
> > have ended up with java.lang.String.
> >
> > 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 09/05/2005 05:14:14
> >
> > Please respond to aspectj-users@xxxxxxxxxxx
> >
> > Sent by:    aspectj-users-bounces@xxxxxxxxxxx
> >
> >
> > To:    aspectj-users@xxxxxxxxxxx
> > cc:
> > Subject:    Re: [aspectj-users] Question on
> Tracing
> > Aspect
> >
> >
> > Thanks Matthew. As i mentioned before, i'm using
> > staticinitialization to get the logger as follows:
> >
> >
>
EspressoTrace.initLogger(EspressoLogger.getLogger(thisJoinPointStaticPart.getSignature().getDeclaringTypeName().getClass()));
> 
> >
> >
> >
> > When i use the above, i don't see the correct
> class
> > name in the log statement.  Could you please let
> me
> > know what's that i'm missing?
> >
> > Thanks,
> > Manjula
> >
> >
> > Manjula,
> >
> > You have 3 choices:
> > 1. Using a logging framework like
> java.util.logging
> > in
> > the example which
> > has separate configuration. Each time you start
> you
> > program you can chose
> > which classes get logged. The aspect
> implementation
> > is
> > efficient enough
> > that having the logging woven but disabled will
> only
> > have a minor impact on
> > application performance.
> > 2. Use an aspect enabling/disabling technique
> > described by Adrian Colyer in
> > his blog:
> >
>
http://www.aspectprogrammer.org/blogs/adrian/2005/03/perinstance_asp.html,
> >
>
http://aspectprogrammer.org/modules/sections/index.php?op=printpage&artid=2
> > 3. Use the load-time weaving feature that will be
> in
> > the final version of
> > AspectJ 5:
> >
>
http://www.eclipse.org/aspectj/doc/ajdk15notebook/index.html
> >
> > 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> wrote:
> >
> > > 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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> _______________________________________________
> > > > aspectj-users mailing list
> > > > aspectj-users@xxxxxxxxxxx
> > > >
> > >
> >
>
https://dev.eclipse.org/mailman/listinfo/aspectj-users
> > > >
> > > >
> > > >
> _______________________________________________
> > > > aspectj-users mailing list
> > > > aspectj-users@xxxxxxxxxxx
> > > >
> > >
> >
>
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> > > >
> > >
> > >
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> 
> 
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References:
- Re: [aspectj-users] Question on Tracing Aspect
  - From: Matthew Webster

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