Re: [aspectj-users] using static fields in an advice

[Matthew Adams <matthew@xxxxxxxxxxxxxxx>]

Off of the top of my head, I see two quick ways to do this.

1. Reflection.  The advice could use reflection to find a field of type Logger and invoke its info method.

2. Introduction.  Use an ITD to introduce a Logger known to your advice into the class along with methods to control the logging.

HTH,

Matthew

On Tue, Feb 12, 2013 at 9:11 AM, Kempff, Malte <Malte.Kempff@xxxxxxxxxxxxx> wrote:

Hi to all,

I am pretty new to AspectJ and was wondering about a thing…

I saw some nice examples like logging methods the start and the end. In that example there was just an System.out used. I was trying that using log4j but did not get along directly.

After some googling I found a kind of reflective workaround so it looks like this;

import org.apache.log4j.Logger;

import org.aspectj.lang.Signature;

import de.lala.Klasse1

import de.lala.Klasse2;

import de.lala.Klasse3;

public aspect Performance

{

   

    pointcut classes()      : within(Klasse1) || within (Klasse2) || within(Klasse3);

    pointcut constructors() : classes() && execution(new(..));

    pointcut methods()      : classes() && execution (* *(..));

   

    

    before () : constructors() || methods()

    {

        Signature sig    = thisJoinPointStaticPart.getSignature();

        Logger    logger = Logger.getLogger(sig.getDeclaringType());

        logger.info("----- start:"+sig);

    }

   

    after () : constructors() || methods()

    {

        Signature sig    = thisJoinPointStaticPart.getSignature();

        Logger    logger = Logger.getLogger(sig.getDeclaringType());

        logger.info("----- end:"+sig);

    }

}

 

The disadvantage is that I need  the aspect-library to run my program.

Is there any way to use the static logger field provided in eaqch class  of its own for the advice? If yes, what is the correct syntax for that?

 

Thanks for useful hints in advance

 

Malte

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