summary of reliable req-response proposal

[Jacques Durand <JDurand@fsw.fujitsu.com>]

Title: summary of reliable req-response proposal

Here is a tentative summary of the reliable request-response proposal I have sent
a couple of weeks ago ( co-signed Marc G., Sunil K., Payrits S., Jacques D.)

Because it is a big chunk, we 'd like to get feedback first on the overall direction of the proposal
(summarized below).
Then there are still some details left to be discussed.

Jacques

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General recommendation on what WS-R should cover regarding Guaranteed delivery (GD)
of messages involved in a WSDL request-response :

1- Only the following GD cases should be supported by this version of WS-R:
- GD of request + GD of response (Variant 1)
- GD of request + no GD of response (Variant 2)
The following case should be excluded (not covered by this specification) (see Option 3.1.1):
- no GD of request + GD of response (Variant 3)

2- The recommendation for GD of request-response, is that its use of Ack and resend procedures
will differ from one-way ops in the following way:
- request-response is treated as a single transaction (will be entirely replayed, if either leg failed)
- in case of Variant 1, in case the response is not acknowledged, the request-response should not be replayed.
Instead, the Ack should be resent (see Proposal 1.2) (depending on firewall restrictions on either side,
either using RMP-level polling to get the Ack, or a resending mechanism for Acks.)(to resolve!)

3- Given the impact of supporting GD request-response on SOAP implementations (seee Appendix A),
recommendation is that it should belong to a higher conformance profile for WS-R.
i.e. some implementations that cover only the reliability of one-way operations
should still be considered as conforming at some level to WS-R.