| Re: [aspectj-users] WeavingAdapter - how to use it? |
Hello, thank you for the replies! On Nov 20, 2009, at 11:45 PM, Andy Clement wrote: > Hi, > >> I use my own agent, to perform other types of analysis on the bytecode. Thus I would like to use the load-time facilities offered >> by AspectJ out of their normal context. I searched a bit and I found WeaverAdapter. However, what is not clear to me is how >> to use it. Could someone point me to a tutorial, example, etc? > > Unfortunately there is no real documentation on that. You may find > some googling through the mailing list archives as a few people have > done it before, but it hasn't been formally written up due to lack of > time. If anyone wants to help out fleshing out the details, the wiki > space on http://wiki.eclipse.org/AspectJ would be a great place to > document it... I found such a question, with example code, but I wasn't able to instrument anything :(. Please find attached the source code for my little experiment. I followed some guidelines I found in a previous mail sent to this list. However, it does not work for me. I should mention I am using Java 6, with AspectJ 1.6.6
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Example.zip
Description: Example.zip
To run a small test, compile the code and execute java TestStatic Test.class This will output the INSTR_Test.class file that one can rename to Test.class and inspect with javap -c -private Test This will show that the instrumentation has not been performed. > > My initial advice would be to look at how it is used by AspectJ > itself. See the Aj/WeavingURLClassLoader class and other types in > that package. > >> I would like to ask what is the GeneratedClassHandler for? > > As part of weaving, AspectJ may create classes, for example marker > interfaces or closures for around advice weaving. These are passed to > the GeneratedClassHandler which should decide what to do with them - > probably define them to the classloader. > Thanks for clearing that up! >> Also, do I need to pass to the WeaverAdapter the entire classpath for the classes, since I already have the bytes of the class I want to instrument? > > The weaver (inside the adapter) will need to be able to resolve types. > It won't weave anything you don't ask it to, but in the process of > weaving what you want it may need to look up many types to determine > whether pointcuts match. Is there a reason you can't just give it a > suitable classpath? > You're right. >> Also, for the URLs for the aspects, do these have to point to an .aj file? or a compiled version? I tried with the ".aj" files but no success. > > Compiled version, there is no on the fly compilation. Although LTW > does support a rudimentary form of defining aspects in aop.xml. I used ajc with the option of creating a jar. Best regards, Silviu > > Andy > _______________________________________________ > aspectj-users mailing list > aspectj-users@xxxxxxxxxxx > https://dev.eclipse.org/mailman/listinfo/aspectj-users