Re: [soa-rm-ra] OO vs. SOA and what goes into a service

[Duane Nickull <dnickull@adobe.com>]

Careful, message names as service definitions gets into the "S" area.

Duane
(Semantics)


On 1/22/08 3:58 PM, "Danny Thornton" <danny_thornton2@yahoo.com> wrote:

> The message names can denote the action to take -
> AddResourceRequest and AddResourceResponse for
> example.  If CRUD operations are performed by a
> service, the actions can be realized through CRUD
> message types and could be handled by a single
> service.  You can define real world effects or
> constraints for the action/message just like any other
> action/message the service may receive.
> 
> In the above model, the interface can have a single
> method (like receiveMessage) where the received
> message type denotes the action.
> 
> The other model is to have separately named methods in
> the service for the actions.
> 
> A real difference for a service and an OO object is
> that service functionality is self contained and it
> does not flow across the wire, only the information in
> the information model flows across the wire.  With an
> OO object both the data and the functionality of the
> object flow across the wire.  This is why OO objects
> with functionality reak havoc when they are
> distributed.  For example, I may accept some
> distributed OO object and then find out I have to
> compile in another 5,000 libraries (that's how it felt
> sometimes) to use it because of all the functionality
> that came with it.
> 
> Danny
> 
> --- Ken Laskey <klaskey@mitre.org> wrote:
> 
>> Is it fair (or at least not too distorted) to say
>> that with OO we 
>> define an object and look for what we can do to it
>> (i.e. its methods)
>> while with SOA we identify what we want to do (i.e.
>> business  
>> functions) and then, if appropriate, look for
>> objects to do it to?
>> 
>> This gets back to the discussion last October on
>> what actions get
>> bundled together in a service.  From an OO
>> perspective, I choose an
>> object and then attach CRUD methods.  In SOA, would
>> the CRUD methods
>> individually be things I want to do, each with a
>> describable real
>> world effect (and possibly policies on who can do it
>> and under what  
>> conditions), and I define services to carry out
>> those functions?
>> 
>> Are both perspectives/design approaches equally
>> valid?  What are the
>> implications for description and discovery?
>> 
>> Ken
>> 
>> 
> ------------------------------------------------------------------------
>> 
>> ------------------
>> Ken Laskey
>> MITRE Corporation, M/S H305     phone:  703-983-7934
>> 7515 Colshire Drive                        fax:
>>   703-983-1379
>> McLean VA 22102-7508
>> 
>> 
> 
> 
> 
>       
> ______________________________________________________________________________
> ______
> Be a better friend, newshound, and
> know-it-all with Yahoo! Mobile.  Try it now.
> http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe from this mail list, you must leave the OASIS TC that
> generates this mail.  You may a link to this group and all your TCs in OASIS
> at:
> https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php
> 

-- 
**********************************************************************
"Speaking only for myself"
Senior Technical Evangelist - Adobe Systems, Inc.
Blog - http://technoracle.blogspot.com
Community Music - http://www.mix2r.com
My Band - http://www.myspace.com/22ndcentury
Adobe MAX 2008 - http://technoracle.blogspot.com/2007/08/adobe-max-2008.html
**********************************************************************