Re: [ws-tx-comment] WS-BusinessActivity Specification

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

"Dominik Heller" <Dominik.Heller@gmx.net>
wrote on 17/01/2008 15:01:51:

> Hello Ian,
> first of all thanks for your fast response i really appreciate it.
> So I am a little bit confused right now. If I understood you right
> then the parent and the child activity do not necessarily need to
be
> in a coordinator-participant relationship 

Right


> though as an example the 
> parent activity could be the participant of a coordinator, having
> several child activitys in the form of fulfilling some sequential
> work on other WS or other entites? 

Any activity has a coordinator. If A and B are distinct
activities then they both have coordinators that drive the agreement protocol
with any participants in their respective activies. One way of relating
any activity B to any activity A is to have some component that is part
of B to be a participant in A. How any relationship between different activities
is established is outside the scope of WS-BA - WS-BA describes what goes
on within a single activity that is distributed between web services, each
of which may register a participant in the activity. In the example I mentioned,
a participant in a "parent" activity was also a coordinator of
another "child" activity. In this example, when the business
processing of the child activity is complete, the child's coordinator sends
"wsba:completed" to the parent activity coordinator. The parent
activity's coordinator later tells its participants to close or compensate.

> in this case one of the childs 
> could be another coordinator with a mixedOutcome having some 
> participants, though the whole outcome would rely on the final 
> command the parent activity would get from its own coordinator, right?

Yes

> 
> well as I said I am a little bit confused right now, I hope I didn't
> mess up to much. Thanks
> 
> Dominik
> 
> -------- Original-Nachricht --------
> > Datum: Thu, 17 Jan 2008 13:29:29 +0000
> > Von: Ian Robinson <ian_robinson@uk.ibm.com>
> > An: "Dominik Heller" <Dominik.Heller@gmx.net>
> > CC: ws-tx-comment@lists.oasis-open.org
> > Betreff: Re: [ws-tx-comment] WS-BusinessActivity Specification
> 
> > Dominik,
> > The WS-BA spec is prescriptive about how a coordinator must manage
> > participants within a business activity scope but is not prescriptive
> > about the relationship between parent and child activity scopes.
In your 
> > example, activites B, C and D are each sibling child activities
of A. One 
> > way of relating a child activity to its parent is to make the
coordinator 
> > of a child activity a participant in its parent activity, although
the 
> > specification does not require this. Even though the Coordinator
for B is 
> > an AtomicOutcome coordinator (and the outcome of all participants
within 
> > the scope of B must be the same), if it were also a participant
of A it 
> > would be a participant in the MixedOutcome activity A. Continuing
this 
> > example, the completion of the AtomicOutcome work of B would
result in a 
> > wsba:Completed protocol message to A (in B's role as a participant
of A in
> > this example). Once A received all its wsba:Completed signals,
it would 
> > consult application logic to determine which participants to
close and 
> > which to compensate.
> > 
> > Regards,
> > Ian Robinson
> > 
> > 
> > 
> > 
> > "Dominik Heller" <Dominik.Heller@gmx.net> 
> > 17/01/2008 10:08
> > 
> > To
> > ws-tx-comment@lists.oasis-open.org
> > cc
> > 
> > Subject
> > [ws-tx-comment] WS-BusinessActivity Specification
> > 
> > 
> > 
> > 
> > 
> > 
> > Hello,
> > I am reading through the WS-BusinessActivity Specifiaction right
now and I
> > am not sure if I understood the concept of the Business Activity
scopes 
> > correctly. Well to picture the way of my understanding right
now I 
> > describe a little scenario:
> > the top node of the Business Activity is a MixedOutcome Coordinator
A 
> > which has three childs say, one AtomicOutcome Coordinator B with
two 
> > childs and two separate MixedOutcome Coordinators C and D with
two childs 
> > each.
> > 
> > So do I guess right that every coordinator is contained in a
separate Web 
> > Service because of separate business logics and then is just
plugged 
> > together  to a Business Activity?
> > 
> > The WS-BA spec is talking about nested scopes and that a business
> > application is allowed to select which child tasks are allowed
in the 
> > overall outcome. So in the end this means that the business logic
of the 
> > Coordinator C chooses which of his childs has to close and which
has to 
> > compensate and then notifices the Coordinator A that it is ready
for 
> > closing or compensation, right?
> > 
> > 
> > Well thanks in advance for your help
> > 
> > Dominik Heller
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