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From "Bartosz Kowalewski (JIRA)" <>
Subject [jira] Created: (ARIES-373) Sample implementention of AspectJ-based SPI mechanisms for SPI-Fly
Date Thu, 05 Aug 2010 01:46:15 GMT
Sample implementention of AspectJ-based SPI mechanisms for SPI-Fly

                 Key: ARIES-373
             Project: Aries
          Issue Type: Improvement
         Environment: SPI-Fly
            Reporter: Bartosz Kowalewski

David Bosschaert some time ago contributed a set of Equinox Aspects-based examples showing
how to use aspects to make SPI work inside an OSGi container. I promised to contributed an
enhanced verion of these mechanisms and integrate these into SPI-Fly /Maven projects, Pax
Exam, etc./. I'll attach a patch with those changes in a moment. 

Few important notes:

1. This not intended to be committed directly to Aries SVN. The only purpose of this patch
is to provide initial impl that could be used when doing additional experiments and evaluation.
The patch is dirty, I was in hurry when doing it and there are lots of ugly pieces of code
inside :). If we decide to go with this approach, I'll prepare a clean patch once I'm back
from vacation - in two weeks' time.

2. The problems that were identified in the discussion about using AspectJ in SPI-Fly haven't
been resolved yet. This includes (but is not limited to): 
- being tightly coupled to Equinox; this piece of code is based on Equinox Aspects/Weaving;
this will not work wit any other container
- inability to tell AspectJ to run an aspect on behalf of other bundle; each bundle that wants
to use these new features, needs to contain an aspect and other settings like a Require-Bundle

3. This patch introduces a SPI-Consumer header and enhances the SPI-Provider header. A Pax
Exam test show how to use this new functionality once you copy the aspect to your bundle and
configure Require-Bundle header.

4. I haven't found the latest version of Equinox Weaving in any of publicly available Maven
repos. That is why, these libraries will need to be copied manually to the itests project
(to the weaverBundles subdirectory). I'll attach these bundles to this JIRA.

This patch is huge, so I guess there might some issues with applying it. If you have problems
with that, let me know and I'll try to generate it again.

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