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

[Jim Marino <jim.marino@gmail.com>]

On Sep 1, 2009, at 9:15 AM, Anish Karmarkar wrote:

> 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.
>

I should have been clearer. My question wasn't about using the JMS API  
directly. Rather, it was about using it (and a JMS provider) to build  
eventing functionality as a binding.

> 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 ;-)

That was my point :-)

>
> 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.
>

So far it seems to me that this can be handled by services,  
references, and bindings. I may be wrong in the end, but it seems  
worthwhile to start from that premise given the additional complexity  
the eventing proposal introduces.

Jim


> 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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