Re: [service-orientated-architecture] Re: if f(x) changes, do you version the service?

[Michael Poulin]

Fully agreed with Robin.
- Michael

Robin <[EMAIL PROTECTED]> wrote:

I agree. The contract is not just the interface, it is larger than
that but the service interface definition must be included or attached
to it.
In the contract, there must be also things like SLA, policies, etc etc

Robin

--- In service-orientated-architecture@yahoogroups.com, Michael Poulin
<[EMAIL PROTECTED].> wrote:
>
> Robin wrote: "If the interface is not changed, it means
> this interface is generic and the contract is a document somewhere
> exchanged between service provider and consumer that describes what's
> in the messages."
>
> The SOA Service Contract is MUCH 'wider' than "what's
> in the messages". A 'contract' for Web Services is WSDL, yes, but
Web Services is just one of possible sub-sets of SOA Services (to me,
its just a type of interface). So, if a change in the f(x) affects SOA
Service Contract, it has to be versioned, otherwise - no.
>
> Here is an extreme example: after a change in the f(x), the SOA
Service started to accept porno content via its new function. If your
(as a user) Contract does not require a notification about all new
Service features and/or explicitly prohibits porno content, you are
fine, no need for a version. Otherwise, it is up to you to decide if
you want your business to be associated with porno transfer... but you
have to be officially notified about that fact according to the
Contract. So you will be able to use previous version of the Service
without the feature in question (it IS an extreme example of SOA
Service versioning issue).
>
> - Michael Poulin
>
> Robin <[EMAIL PROTECTED]> wrote: What do you
mean by versioning the service?
> - If you are talking about the version of the service implementation,
> of course yes. A new logic in the service will mean a new
> implementation of the service.
> - If you are talking about the version of the service interface, I
> would say no because the interface is backward compatible, in fact,
> the same. But you could create a new version of your interface to
> deliberately break existing clients that could be outside of your
> control (I have seen people doing this)
> - If you are talking about the contract, if the result is different
> but the interface is the same, the difference might be in the nature
> or the quantity of data returned. In any case, you have to inform the
> service consumers of this change but creating a new version of the
> contract will be necessary when the clients might be seriously broken.
>
> There is a contradiction on your question. In most of the cases, if a
> service is changed and f(x) begins producing a new result, it means
> the interface is changed. If the interface is not changed, it means
> this interface is generic and the contract is a document somewhere
> exchanged between service provider and consumer that describes what's
> in the messages. Of course, a new version of this document is then
> produced as a result of the change.
> While I believe some people will not consider that change as a new
> interface, I think it is untrue on a functional level.
>
> Robin
>
> --- In service-orientated-architecture@yahoogroups.com,
> "jeffrschneider" <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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