Hi Sachin, I like your proposal for using annotations for our Geronimo-specific deployment plans. If
annotations do ultimately fulfill their intended purpose over time they could potentially simplify
the work for our end users in dealing/creating Geronimo-specific deployment plans.
Thanks.
Tim
Sachin Patel wrote:
To broaded the topic, and I asked this earlier and didn't get any
responses, but do we foresee needing annotations for any of our geronimo
plans?
On Dec 12, 2006, at 12:46 PM, David Jencks wrote:
I think we have a lot of work to do for annotation processing, and I
don't recall seeing any discussion of the steps involved. I haven't
read most of the specs involved so what I say is probably full of
errors, but this provides a great opportunity to correct me :-)
I think there are 2 kinds of annotations: some describe something
about the class that is exposed to the outside world, such as
@WebService, and some describe something supplied to the class from
its environment, such as @Resource. The @Resource type annotations
result in something getting bound in the components java:comp/env jndi
context, and then that thing getting assigned to the annotated field.
I believe all of these need to be translated to the xml in the spec
deployment descriptor and made available through jsr-77. This is a
pretty major change to jsr-77 since previously we were supposed to
provide the dd unchanged as a string.
I think that there is no further information needed for the "exposing"
annotations: once they are in the xml, we can just deploy from the xml
and we're done. However for the "resource injection" annotations, we
still need some code to get the object out of jndi and put it into the
field.
So, here's how I imagine this working:
Deploy time:
1. scan all the classes for annotations
2. process them into the xml descriptor
3. deploy from the modified xml descriptor, includiing constructing
the jndi tree (as done currently)
4. add objects to inject resources
Run time:
start up just like we do now
So, I don't think we have any of this code in geronimo. I suspect
there is a bunch of simliar code in other projects such as openejb,
openjpa, and cxf (at least) How much can we crib from elsewhere?
Comments desperately needed :-)
thanks
david jencks
-sachin
--
Thanks,
Tim McConnell
