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Subject: Service and context
Ah Peter! You've sparked a thought...
Three
statements to frame the thought:
(1) A service description defines the
functionality and operational
requirements (data model, semantics &
policy) for interacting with a
service.
(2) Interacting with a
service includes invocation or inquiry.
(3) It appears that we've
determined that a service description is
independent of the
*service*
Thus, is a service duplicative (and thus not truly
service-oriented?)
when *any* part of that description changes? Or are
two services the
same when the functionality/data models are static but the
operational
requirements (and thus the metadata) differ?
A concrete
example: Let's say there are two real-time ordering
services.
Both offer the same functionality to whoever invokes them.
However, one is
only available to preferred customers. A benefit of
preferential
treatment is the guaranteed response times, represented by
the service
policy. In addition, both services operate on a single
resource - the
inventory data store.
Why are these two services distinct or
duplicative? Does this mean that
functionality exposed in this manner
is not service oriented?
Rebekah
Rebekah
Metz
Associate
Booz Allen Hamilton
Voice: (703)
377-1471
Fax: (703) 902-3457
>
-----Original Message-----
> From: Peter F Brown [mailto:peter@justbrown.net]
> Sent:
Friday, May 27, 2005 11:42 AM
> To: 'Ken Laskey'; 'SOA-RM'
>
Subject: RE: [soa-rm] David Linthicum Says: "ESB versus
Fabric.Stop
It!"
>
> But surely if your service offer includes a
better SLA, faster
response
> time, better quality of result, etc. it
is not a duplication of a
service
> but a different service: it may
however use the same resources, and
that
> is
> a different
issue...
>
> -Peter
>
> -----Original
Message-----
> From: Ken Laskey [mailto:klaskey@mitre.org]
> Sent: 26
May 2005 02:44
> To: SOA-RM
> Subject: Re: [soa-rm] David Linthicum
Says: "ESB versus Fabric.Stop
It!"
>
>
> On May 25, 2005,
at 2:30 PM, Chiusano Joseph wrote:
>
> >> -----Original
Message-----
> >> From: Duane Nickull [mailto:dnickull@adobe.com]
> >>
Sent: Wednesday, May 25, 2005 2:29 PM
> >> Cc:
soa-rm@lists.oasis-open.org
> >> Subject: Re: [soa-rm] David
Linthicum Says: "ESB versus Fabric.Stop
> >> It!"
>
>>
> >> The question that Rebekah asked that is tough and we
need to answer
> >> is "What is the opposite of Services". On
other words, if it is
not
> >> service oriented, what is
it. This is a tough question and our RM
> >> must address a
level of clarity that we can point at something that
> >> is not SOA
as well as something that is.
> >>
> >> I would like to
hear opinions on this.
> >
> > Duplication of services instead
of sharing services: Not SOA.
> >
>
> This gets into the
hairy realm of governance. I could argue that you
> should
>
not be funded to develop a service because I provide adequate
>
functionality.
> However, you may respond that my quality of service
stinks and you'll
do
> better. On the other hand, I want to
extend the functionality of your
> service but to do that I will be
duplicating everything you can do.
>
> This goes on and
on.
>
> -1
>
> Ken
>
> > Kind
Regards,
> > Joseph Chiusano
> > Booz Allen Hamilton
>
> Visit us online@ http://www.boozallen.com
>
>
> >> Duane
> >>
>
>>
>
------------------------------------------------------------------------
>
------------------
> Ken Laskey
> MITRE Corporation, M/S
H305 phone: 703-983-7934
> 7515 Colshire
Drive
fax: 703-983-1379
> McLean VA
22102-7508
>
>
>
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