Re: [sca-assembly] Pointer to SCA event processing presentation

[Anish Karmarkar <Anish.Karmarkar@oracle.com>]

Jim Marino wrote:
> Hi Anish,
> 
> I have a very naive question about the eventing proposal: is there a 
> capability that cannot be implemented using JMS? My impression is the 
> JMS API has everything that is needed to be the foundation of an 
> eventing system.
> 

JMS doesn't provide what is needed for an assembly model. JMS, as you 
know, is a *Java* *API*. It doesn't say how to do things in, say, BPEL. 
It doesn't say how to create a composite application that contains 
components that want to subscribe or publish events of certain types. It 
doesn't allow multiple components that contain publish/subscribe/topic 
functionality to be connected/wired/configured and deployed/managed as a 
  single entity.

If I were to stretch the comparison a bit: even though we have JAX-WS, 
which can be used to implement and invoke services, we still need SCA ;-)

What the contribution addresses is an assembly-level model for pub-sub. 
It provides the additional concepts/constructs needed to declare 
subscribers (or consumers), publishers (or producers), topics (channels) 
that can coexist with existing service-reference-wiring model and takes 
advantage of the intent/policy framework.

Hope that makes sense.

-Anish
--

> As an aside, I'm not asking this as a way of implying that JMS should be 
> used and/or required.
> 
> Jim
> 
> 
> 
> On Aug 26, 2009, at 6:57 PM, Anish Karmarkar wrote:
> 
>> Hi Sanjay,
>>
>> Here is the link to the presentation:
>> http://www.oasis-open.org/apps/org/workgroup/sca-assembly/download.php/32653/SCA-EventingProcessing.pdf 
>>
>>
>> It does talk about the motivation and has use cases.
>>
>> HTH
>>
>> -Anish
>> -- 
>>
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