> -----Original Message-----
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Steve Ross-Talbot
> Sent: jeudi 25 mai 2006 15:59
> To: [email protected]
> Subject: Re: [service-orientated-architecture] Re: an SOA in practice
>
>
> I think that Gregg is correct developers do not and should not care
> about the transport as long as the behavioral contract is fulfilled
> correctly by each participant service in a system.
>
> This does not mean that the behaviors can be guaranteed because the
> stack upon which you base your participant service may have different
> underlying synchronisation and threading models. When those
> models clash with the behavioral contract of the services you care.
> When it does not you don't care and don't need to care.
>
> The ideal world (which of course we do not live in) would enforce
> behavior, enforce data and functions and so guarantee interoperability
> of participant services regardless of the underlying transport.
There are many differences between the ideal world and the real world.
The "8 fallacies of distributed computing" is one _expression_ of that
difference: you cannot ignore that networks break down and that
bandwidth isn't infinite.
But even in the ideal world there may be stringent behavioral contraints
of the kind "if you don't respond within the next 30 ms, the roof will
come down".
Enforcing such behavior in the real, networked world, "regardless of the
underlying transport", is not exactly an easy task.
> Given WSDL does not provide behavioral contracts (just
> functional ones over data)
> how can we:
> i) describe the behavior?
> ii) monitor services against their described behavior?
> iii) guarantee that services do behave correctly?
> All of course in a standard and unambiguous way. If we can do
> this then we can ensure that different implementations over
> different transports do the right thing at right time and that way
> ensure interoperability and substituability of participant services.
Right. Then, what's your approach to answer the above questions?
> Cheers
> Steve T
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