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Subject: What is SOA (Really???) (Was RE: [soa-rm] Duplicative or Distinct Service)
Does the REST model help with the answer? If each service
"variant" actually
has a different "identity" (==URI), then they are
different services, no?
There is no need to have any reference back to the
resources used, etc. Or
to paraphrase Chris Sotudeh's point: is governance
the key or is it really
identity?
-Peter
-----Original
Message-----
From: Metz Rebekah [mailto:metz_rebekah@bah.com]
Sent: 27
May 2005 16:25
To: peter@justbrown.net; Ken Laskey; SOA-RM
Subject: RE:
[soa-rm] David Linthicum Says: "ESB versus Fabric.Stop It!"
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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