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From Gianny Damour <>
Subject Re: Effectiveness of WADI's Design and Implementation Comforted
Date Sun, 21 Oct 2007 11:58:22 GMT
Dain, Jeff,

Thanks for your feedback on the weakness of the annotation approach.  
It should be easy to have a less obtrusive configuration mechanism as  
the logic is encapsulated within a single (AspectJ) aspect. I will  
see what I can do.

In more details, an aspect adds the interface ClusteredStateMarker to  
any classes having @ClusteredState:
     declare parents:
         (@ClusteredState *) implements ClusteredStateMarker;

It is easy to have a pattern driven mechanism instead, e.g.:
     declare parents:* implements ClusteredStateMarker;

I now need to find a way to specify patterns outside of the aspect.

Regarding the WADI vs Tribes on Tomcat suggestion, there isn't yet a  
Tomcat session manager integrated with WADI. BTW, WADI actually  
relies on Tribes for its group communications thanks to Filip Hanik's  
work on wadi-tribes.

Regarding a test with a bigger session size, I also would like to  
know how wadi-aop performs. However, I would like to first resume  
some Geronimo clustering work. Once done, I will touch base with  
Jason as suggested to know if he can grant me access to GBuild in  
order to conduct a real distributed test.


On 19/10/2007, at 10:19 AM, Dain Sundstrom wrote:

> I agree about the annotation thing.  Would it be difficult change  
> the design to have some reasonable defaults, and only use  
> annotations (or xml) for overrides?
> -dain
> On Oct 18, 2007, at 3:49 PM, Jeff Genender wrote:
>> Gianni,
>> What you have done is very cool.  I guess my only comment is that  
>> what I
>> am reading is that the annotations force a lock to the clustering
>> engine, as opposed to being somewhat transparent by swapping out the
>> clustering manager.
>> Therefore, my application code needs these annotations coded as a  
>> part
>> of it.  In otherwords, in order for me to leverage the fine grained
>> capabilities of WADI, my application needs to be coded with the WADI
>> annotations.  Did I read that correctly?
>> Regardless...its pretty cool stuff.  We should talk about the
>> contract/interface for openejb...I look forward to working with  
>> you ;-)
>> Jeff

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