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Subject: 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.php/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
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