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

[Danny Thornton <danny_thornton2@yahoo.com>]

The compilation problem I was referring to goes deeper
than the class interface and extensions.  The
distributed OO object could have a single method but
require many libraries in its implementation of that
single method.  To use the distributed OO object means
signing up to all the private side dependencies of the
object.

Danny

--- Rex Brooks <rexb@starbourne.com> wrote:

> Not quite, Ken,
> 
> An object usually or typically instantiates a class.
> It has all the 
> methods it will ever have in its class
> specification. To add new 
> methods you have to "extend" the class, which means
> that the new 
> class inherits all of the methods of the class it
> extends plus 
> whatever new methods you specify.
> 
> A SOA service may or may not have a single class it
> embodies. It may 
> have many classes. The compilation problem Danny
> cites comes from 
> classes that are composed of a several new classes
> extending the base 
> class, each in its own turn adding to the total
> methods involved.
> 
> Use a few classes in a service, e.g. a class for
> adding new contacts 
> with new postal addresses and a class for adding
> business and 
> personal email addresses; and a couple of classes
> for different kinds 
> of messages, such as requests and responses, and you
> get a large set 
> of service components that may belong to a single
> service such as a 
> reverse 911 message distribution services but are
> not contained 
> within a single object.
> 
> Cheers,
> Rex
> 
> At 6:05 PM -0500 1/22/08, Ken Laskey 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
> >
> >
> >
> >Attachment converted: Macintosh HD:smime 703.p7s ( 
>   /    ) (00366E46)
> 
> 
> -- 
> Rex Brooks
> President, CEO
> Starbourne Communications Design
> GeoAddress: 1361-A Addison
> Berkeley, CA 94702
> Tel: 510-898-0670
> 
>
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