Re: [aspectj-users] Question about Compile Time Weaving, OSGI, Java Web

[Martin Lippert <lippert@xxxxxxx>]

Hi Daniel,

I haven't tried this myself, but you should be able to use compile time 
weaving for aspects within an OSGi world. I think you need to create the 
dependencies between your bundles in the right way and tell the AspectJ 
compiler to use the aspects from another project to weave them into some 
other projects.

The difference to load time weaving is: using compile time weaving you 
need to hard-weave your aspects into your OSGi bundles. This means your 
aspects can only affect classes from other bundles that you are aware of 
at compile time. This might not always be the case for OSGi since new 
bundles from other parties are coming and going.

For example: if your aspect should weave into some existing Eclipse SDK 
bundles that people have installed on their machines, compile time 
weaving might be somewhat complicated (you would to recompile those 
bundles and put them into a fragment for the SDK bundles). If your 
aspects should also weave against new bundles that people might install 
in the future, compile time weaving is also not really usable.

If you implement a self-contained rich client platform and you (or your 
team) are the only people defining what gets installed in that OSGi 
runtime, compile time weaving is an option, I think.

Just a few thoughts,
-Martin



On 02.07.10 15:17, Kashtan, Daniel wrote:
> Hey all,
>
> I am currently developing an OSGI project that makes use of AspectJ. I am using Java Web Start too which means that I cannot use Load Time Weaving. With Compile Time Weaving, it appears that I will need *.aj files for every bundle, and that I have to duplicate code if I want the same aspect to affect java classes in different bundles. Am I wrong about this? I am not sure if I am misinterpreting what Equinox Aspects is saying about Compile Time Weaving, or if I am not taking advantage of OSGI enough to be able to use aspects in multiple bundles. Let me know if I made my problem clear and if I have any way around duplicating aspect code.
>
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