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From: Maciej Sobczak <see.my.homepage@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Derived private interface
Date: Wed, 10 Aug 2011 03:07:43 -0700 (PDT)
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Date: 2011-08-10T03:07:43-07:00
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On Aug 9, 11:35=A0pm, "Randy Brukardt" <ra...@rrsoftware.com> wrote:

> I don't see any dependency inversion in the web server. (The web server
> calls packages to evaluate particular commands or operations -- that's ho=
w
> almost all programs work!)

The dependency inversion is in the fact that the web server does not
have to know the modules it is calling. It is enough if the modules
know the web server (and its registry, to be exact) - thanks to this
new modules can be added without touching the web server itself
(that's the open/close principle at work now). What is needed for the
dependency inversion to work is a spec of something common - in the
case of OOP this is an interface.

> This sounds more like a case of trying to make
> everything look like a nail (to the OOP hammer).

No, this is trying to reduce the effort to maintain a heavy component
that is tested and verified only once.

--
Maciej Sobczak * http://www.msobczak.com * http://www.inspirel.com