Re: [aspectj-users] Question on Tracing Aspect

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

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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