RE: [ws-rx] discussion of issue i009

[Ashok Malhotra <ashok.malhotra@oracle.com>]

Chris:
As with issue i024, we need to determine the messages to which this new
assertion applies.  It seems from your discussion that it applies only
to the CreateSequenceResponse.  Does this makes sense or are there other
usecases?

All the best, Ashok
 

> -----Original Message-----
> From: Christopher B Ferris [mailto:chrisfer@us.ibm.com] 
> Sent: Wednesday, September 14, 2005 9:40 AM
> To: ws-rx@lists.oasis-open.org
> Subject: [ws-rx] discussion of issue i009
> 
> All,
> 
> This email is intended to start a discussion on issue i009 [1].
> 
> The issue has to do with providing the RMD with the capacity 
> to advertise its DA QoS. It is somewhat related to issue 
> i024, raised by Ashok. However, I don't believe that the 
> resolutions need to be tied to one another.
> 
> Basically, there is currently no specified means of declaring 
> the DA applied at a given RMD endpoint. It has been suggested 
> that the RMS (or AS) might have a vested interest in knowing, 
> a priori to establishing a Sequence with an RMD what DA would 
> be applied. For instance, it may require that the messages be 
> processed InOrder. If the RMD were not enforcing InOrder DA 
> at the RMD, then the source endpoint might choose not to 
> engage with that endpoint.
> 
> I would propose that one way to resolve this would be to 
> define RM policy assertions that specify the DA.
> e.g. a psuedo-schema for this would be as follows:
> 
> <wsrm:RMAssertion>
>   <wsrm:DeliveryAssertion mode="[AtLeastOnce|AtMostOnce|ExactlyOnce]"
> ordered="[xs:boolean]"? ... >
>     ...
>   </wsrm:DeliveryAssertion>?
>   ...
> </wsrm:RMAssertion>
> 
> Thus, an endpoint could declare its DA QoS in the policy 
> statement associated with the endpoint.
> 
> Thoughts?
> 
> [1]
> http://www.oasis-open.org/apps/org/workgroup/ws-rx/download.ph
> p/14329/ReliableMessagingIssues.xml#i009
> 
> Cheers,
> 
> Christopher Ferris
> STSM, Emerging e-business Industry Architecture
> email: chrisfer@us.ibm.com
> blog: http://webpages.charter.net/chrisfer/blog.html
> phone: +1 508 377 9295
> 
>