On Apr 4, 2009, at 11:15 AM, Jason van Zyl wrote:
On 4-Apr-09, at 10:13 AM, David Jencks wrote:
I'd like to write something.... I'll call it an archetype for
now.... that generates a maven project but needs to run a _lot_ of
java code in order to figure out what to put in the new pom.xml.
The basis of it is there given we have velocity templates in there.
I think what you want is to be able to deploy a class along with the
archetype that would execute and manipulate the velocity context
before rendering the files of the archetype. Something like a
delegate for each template that's rendered? For this template do
some mumbo jumbo and set object and flags in the Velocity context.
For sophisticated POM manipulation we can just put a tool in the
velocity context or provide a hook to write out your own POM
completely.
95% of what you need is there already. You definitely don't need to
start over.
Thinking about this a bit more I'm even more confused about how to
proceed. In my case the "lot of java code" is about half of
geronimo. So, I need the archetype to have the same classloader setup/
classloading capabilities as a plugin. So it seems like one choice
would be to simply write a plugin that happens to use the archetype
common code. But this wouldn't fit nicely into the m2eclipse ability
to run the archetype plugin. Is there a reasonably simple way to
have an archetype be a whole plugin whose pom sets up the classloader
for the archetype's code and to have the arechetype plugin manage
this? Is there another approach I haven't thought of?
thanks
david jencks
What's my best strategy here? From a quick glance at the archetype
plugin stuff it looks like this is not currently supported but that
it might be possible to add a third kind of archetype, something
like "code-based" along with file-set and old. Is this interesting
to anyone else? Is it likely to be simpler to just start over and
ignore the archetype plugin stuff?
I'd also like it push dependencyManagement stuff and possibly some
properties into parent poms and check that it's not duplicating
stuff. Is there already code in the archetype plugin stuff that
does this or would I be adding a new capability?
thanks
david jencks
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Thanks,
Jason
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Jason van Zyl
Founder, Apache Maven
http://twitter.com/jvanzyl
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People develop abstractions by generalizing from concrete examples.
Every attempt to determine the correct abstraction on paper without
actually developing a running system is doomed to failure. No one
is that smart. A framework is a resuable design, so you develop it by
looking at the things it is supposed to be a design of. The more
examples
you look at, the more general your framework will be.
-- Ralph Johnson & Don Roberts, Patterns for Evolving Frameworks
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