To version a SOA Service, I follow one straight forward rule:
if a change in f(x) causes a change in a SOA Service Contract, the service version ought to be changed.
Since a SOA Service may have more than on Contract with its consumers, the version change decision is based on an accumulative analysis of all active Contracts for the Service. If no changes in the Contracts are caused by a change in the Service's f(x), you are free to make a f(x) change totally transparent to the Service consumers.
- Michael Poulin
Gervas Douglas <[EMAIL PROTECTED]> wrote:
Chuck, thanks for the clarity of _expression_ there. Even a non-techy
erstwhile mathematician (to a modest academic level) like myself can
appreciate your exposition.
Would that the MBAs in the industry express such clarity of thought so
simply!
Gervas
--- In service-orientated-architecture@ , Chuckyahoogroups. com
D'Antonio <c_dantonio@...> wrote:
>
> I'd be partial to versioning the service in this instance if the
> difference in the result is semantically distinct. By returning a
> result that has changed semantics, you're changing the contract of
> the service. Anytime the contract changes I'd suggest that that
> represents a new version of the service.
>
> For an example, let's start with f(x) returning the square root of
> x. If f(4) was returning 1.78 and you fixed it to return 2, then I'd
> say that's not a new version. If you changed your algorithm so that f
> (4) returned the cube root of 4, and that was the correct purpose of
> the function with the business changes that drove it, then I'd say
> it's a new version. You've changed the expectations inherent in the
> contract so you should use version the service to make that clear.
>
> Chuck
>
>
> Chuck D' Antonio
> Software Consulting Professional
> Mobile: (617) 388-1120
> Email: [EMAIL PROTECTED]..
> IM: dantonioJr (AIM)
> http://www.linkedin.com/in/dantonio
>
>
>
> On Sep 27, 2006, at 9:33 AM, jeffrschneider wrote:
>
> > If the logic in a service is changed and f(x) begins producing a new
> > result, do you version the service?
> >
> > (Note: in this scenario, the interface didn't change just the internal
> > logic.)
> >
> > Thanks,
> > Jeff
> >
> >
> >
>
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