Hi Ranx,
Blueprint is still maintained and supported by Karaf. There are pros and
cons for blueprint.
DS/SCR is a nice alternative.
At the end of the day, behind the hood, it's OSGi services, that you can
use with "native" OSGi approach.
We don't necessary agree with all OSGi alliance directions. Karaf is
really focus on dev + devops, and specifications should be a way to
provide new features in an easy way more than a constraint.
We are working on a prototype right now (named winegrower) to provide a
new experience for developer.
Regards
JB
On 17/10/2018 21:42, Ranx wrote:
I've been using Blueprint for a few years now and a couple of years ago I was
kicking the tires on DS and CDI. At the time there was a vigorous debate
about the future of OSGi and the place for Blueprint, DS and CDI. I've been
developing in Fuse primarily so was stuck with Karaf 2.x and the standard
libraries. However, I'm going to be doing a Fuse 7 prototype and generating
recommendations for a new clean room implementation and some porting of
older bundles as well.
From what I could tell the use of CDI with DS under the covers was
attempting to solve three problems - (1) it would use the better service
mechanics of DS, (2) provide the dependency injection wire up that DS lacks,
and (3) use a standard paradigm that J2EE developers would find comfortable.
PAX CDI was kicking off at the time and a 1.0 final was released in February
of this year (2018). But I don't see a lot of activity.
https://ops4j1.jira.com/projects/PAXCDI/issues/PAXCDI-197?filter=allopenissues
It's well and fine that all those technologies can pay together in the same
sandbox but I go into clients all the time and a lot of what I do is mentor
them on how to use the stack and especially how to test their code during
development. Teaching different modalities isn't realistic.
Normally that would militate toward adopting Blueprint and the Karaf/PAX
team have done good work at keeping it moving forward. But it doesn't appear
to be tied into much of what is happening with the OSGi alliance and their
directions.
Are the trade offs today the same as when that discussion happened here in
2016 or have things shifted since then.
Any insights would be helpful.
Thanks,
Ranx
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