Re: What databases have taught me

From: Robert Martin <unclebob_at_objectmentor.com>
Date: Fri, 30 Jun 2006 19:52:01 -0500
Message-ID: <2006063019520150073-unclebob@objectmentorcom>

On 2006-06-28 07:41:05 -0500, "Daniel Parker" <danielaparker_at_gmail.com> said:

>
> Robert Martin wrote:

>> 
>> It is not hiearchy that drives OO, it is dependency management.  It is
>> the decoupling of callers from callees through the mechanisms of
>> dynamic polymorhism that is the driving force behind OO design.
>>

> It's a matter of perspective. From the perspective of web services
> people, for example, all of your examples of decoupling are in fact
> examples of tight coupling, through dependencies on language bindings
> and platform. From the web services perspective, decoupling is
> achieved through the standardization of the format of documents.

Granted. Though this is not new, nor related strictly to web services. Any set of services that communicate through a standard message format provides a level of decoupling.

OO provides decoupling at a smaller granule than services like these. OO provides for coupling *within* the code of the services. OO provides decoupling at the *line-of-code* level.

-- 
Robert C. Martin (Uncle Bob)  | email: unclebob_at_objectmentor.com
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Received on Fri Jun 30 2006 - 19:52:01 CDT