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From Sachin Patel <sppat...@gmail.com>
Subject Re: Annotation processing
Date Tue, 12 Dec 2006 17:54:34 GMT
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



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