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From Andreas Veithen <>
Subject Re: Radical structure reorg thoughts for 2.3....
Date Mon, 25 Jan 2010 21:22:45 GMT

"cxf-kernel" sounds very Axis2-ish ;-)

More seriously, one of the big design issues in Axis2 is that there is
no separation between API and core/kernel. We just have that
axis2-kernel module containing a huge amount of classes of different
kinds (real APIs/SPIs, internal implementation classes and utility
classes). That makes it very hard to distinguish the public API (which
should be as stable as possible) from those classes that may change
more frequently. If there is ever an Axis3 (or Axis 3.0 ;-), I would
suggest to do that split.

I'm not very familiar with the CXF internals, so I don't know if the
api/rt-core separation in CXF reflects that distinction between public
API and internal classes, but if it does, I would suggest not to make
the same mistake as Axis2.


On Mon, Jan 25, 2010 at 21:32, Daniel Kulp <> wrote:
> I'd like everyone's thoughts on some ideas I have to do some minor
> restructuring for 2.3.  I'm just throwing this out there as some ideas.   We
> don't need to do any of this if people disagree or would find it annoying or
> similar.   I just want peoples thoughts....
> 1) We have a bunch of xjc plugins in common/xjc that really never change.
> There really isn't a reason to have a 2.3 version and a 2.2.6 version and
> such.   They are pretty much completely shareable.    Thus, I'm thinking of
> creating an "xjc-plugins" sub-project to house these.  We could just release
> them once and re-use them until new plugins are needed/created.   common/xsd
> (our xjc wrapper maven plugin) would probably go there as well.
> 2) Likewise, buildtools and maven-plugins/xml2fastinfoset-*  are really RARELY
> changed.   I'd like to have a "build-tools" subproject for these type things.
> This is partially to support (1) above so the checkstyle rules and such are
> more shareable, but it also would remove a few modules from the build.
> 3) Most radical idea:   I'd like to merge what's left in common/*  after (1)
> into api.   Possibly also merge parts or all of rt/core into API.   If we do
> that, possibly just rename api to "cxf-kernel" or make it cxf-core or similar.
> common-utilities, api, and core are really not useable without each other at
> all.   You cannot do much without all three so merging them together seems to
> make some sense.    POSSIBLY tools-common as well.   I  need to look into that
> one a bit more.    We COULD potentially move some stuff OUT of api/rt-core
> that is more ws specific (like the wsdl manager stuff) and into a ws-core or
> something that wouldn't be needed for JAX-RS.   Not sure how much of an impact
> that would have.
> Doing 3 MAY allow better OSGi support as we really would have a "kernel" with
> pretty much EVERYTHING else being plugins into our kernel.
> There will be a slight build speedup as less modules are built and less calls
> to checkstyle and such, but nothing major as a majority is in the systests.
> Now that we've gone with Surefire 2.5, I MAY experiment with the parallel
> setting on a couple of the module, probably cannot on the systests though.
> Now, the MAIN drawback from all this would be merging fixes to 2.2.x is going
> to be much harder in those modules.   I think that would mostly affect me
> though.
> Anyway, I'd like to know what people think about all this.
> --
> Daniel Kulp

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