Re: [aspectj-users] Only enabling specific aspects when weaving with ajc

["Andy Clement" <andrew.clement@xxxxxxxxx>]

Hi Alex,

We have an open bugzilla issue to do with using aop.xml to configure weaving at compile time ( https://bugs.eclipse.org/bugs/show_bug.cgi?id=124460 ) - this would enable you to do what you want.  Right now compilation considers all incoming aspects to be available and they may target any source or other .class files passed into the compiler.  The way you would have to solve it right now is as you suggested, by creating one .jar per aspect and passing only those necessary jars on the aspectpath for the compiler to use.

> Also, right now I'm just
delivering my aspects in a javac-compiled jar (which works because they
are
> @AspectJ-style aspects). Do I need to first use ajc to generate a
read-only aspect library in a separate 
> jar?

You can supply an annotation style aspect built with javac to the ajc compiler (on the aspectpath or inpath).  You do not have to use the ajc compiler to build that aspect in the first place, whether it is for use with load time weaving or a further compile time weaving step.

cheers,
Andy.

2008/12/30 Alexander Devine <alex.devine@xxxxxxxxx>

I have the following situation, and while I have solved the problem using aspectj's load-time weaver, I would like to see if it's possible to handle this problem using ajc at compile time.

1. I have built a java library (the jar file is perf4j.jar) that contains a number of aspects created using @AspectJ style syntax. That is, perf4j.jar was just compiled using javac, NOT ajc.
2. I would like to enable other developers to use my aspects by marking some of their methods with a "Profiled" annotation, which is also defined in perf4j.jar. Thus, my aspects all have a pointcut that looks like: execution(* *(..)) && @annotation(profiled)
3. Right now everything works fine if I use load-time weaving with an aop.xml that looks like this:

<aspectj>
  <!-- we only want to weave in the log4j TimingAspect -->
  <aspects>
    <aspect name="org.perf4j.log4j.aop.

TimingAspect"/>
  </aspects>

  <weaver options="-verbose -showWeaveInfo">
    <!-- other developers specify here their classes they wish to weave -->
    <include within="com.third.party.developer.*"/>
  </weaver>
</aspectj>
4. Is there a way that I can replicate this behavior at compile time using ajc? The problem I have with ajc is that, as far as I can tell, there is no way to specify the class names of the aspects I want to include like there is with aop.xml. That is, my perf4j.jar contains a bunch of different aspects, but other developers are only going to want to chose one of those aspects to weave into their classes. Do I need to generate a different jar file for each aspect? Also, right now I'm just delivering my aspects in a javac-compiled jar (which works because they are @AspectJ-style aspects). Do I need to first use ajc to generate a read-only aspect library in a separate jar?

Thanks for any and all help!

Alex Devine

_______________________________________________
aspectj-users mailing list
aspectj-users@xxxxxxxxxxx
https://dev.eclipse.org/mailman/listinfo/aspectj-users