Re: [ws-tx] Mixed Outcome scenario

[Ian Robinson <ian_robinson@uk.ibm.com>]

We were unfortunately unable to complete the discussion with Alastair today
on the scenario he described in which a single application message resulted
in multiple participant registrations. We did agree, within the TC, to add
a mixed outcome scenario in which 2 PAs register one participant each -
PS1, which will ultimately be closed, and PS2, which will ultimately be
compensated.
The TC wishes Alastair or Peter to describe in more detail (i.e showing the
required message flows in the manner of existing scenarios) a mixed outcome
scenario in which the IDENTITY of the registered participant needs to be
communicated in some way.

Once we have such a scenario, we can then discuss whether or not this is
something that we believe is in scope for the the MixedOutcome coordinator
type and, if it is, whether or not the existing specification actually
enables this to be implemented.

We can schedule discussion of any such detailed scenario on the TC telecon
on Sep 21.

Regards,
Ian



                                                                           
             "Peter Furniss"                                               
             <peter@furniss.co                                             
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                                       <peter.furniss@erebor.co.uk>        
                                                                   Subject 
                                       [ws-tx] Mixed Outcome scenario      
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Following the discussion yesterday, I'd suggest the following as an
outline of a scenario for Mixed Outcome:

IA sends application request to PA, with Mixed Outcome context

PA registers two participants "left" and "right" for participant
completion, and replies

PA completes both participants

IA orders close of "left" and compensation of "right".

(only have a few minutes now, so elaborate with appropriate terminology
etc.  And "left", "right" could be changed (in the scenario
specification, not the implementations) to anything else - key thing is
the participant's "left" will close, "right" will compensate)



However, I believe to make that work, we will find we need to reverse
the no-change decision on participant identifiers. IA's "view" of the
participants must allow it to know which is "left" and which "right".
This doesn't require standardisation of "left" and "right" outside the
scenario definition. It DOES require that the heterogeneous ws-c+ws-ba
implementations can pass a field on at least one message that is put in
by PA and received by IA.

Other variations - including coordinator completion, cancel one,
complete other would also be useful.




You will see this email is sent from a different address. I'm leaving
erebor today and joining another company on Monday. I'm not sure whether
I'll get messages from the distribution in the meantime, so please cc:
peter@furniss.co.uk on replies. (but I'll respond faster on
peter.furniss@erebor.co.uk until about 17:00 uk time today)


Peter

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Peter Furniss
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