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From: Martin Dowie <martin@dowie-cs.demon.co.uk>
Subject: Re: Is Apex dead as an environment for Ada & Java?
Date: 1999/11/30
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Date: 1999-11-30T00:00:00+00:00
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jim_snead wrote:

> In article <384127A5.61431A14@dowie-cs.demon.co.uk>, Martin Dowie
> <martin@dowie-cs.demon.co.uk> wrote:
> > common approach is to have a subsystem per piece of hardware your
> > software
> > monitors/controls (thread?/process?/task?), other subsystems to
>
> Here is an essential problem with Rational
> subsystems. Say you do have a software
> subsystem for each one of your hardware items.
> Let us call them Gamma and Omega.
>
> So the Gamma subsystem implementors create a
> couple of packages called "Logging" and "Debug".
> These are not meant to be used outside of the
> Gamma subsystem so they are not made visible
> to the outside world via whatever mechanism
> Apex uses.
>
> Now say that the Omega subsystem has their
> own internal packages called "Logging" and "Debug".
> The Omega team goes ahead and develops these as
> well, oblivious to the rest of the world.
>
> Now the subsystem that you propose to integrate
> these other subsystems comes along and tries
> to link Omaga and Gamma into a single exec.
> Of course, this won't work because of name clashes
> between the hidden packages. Time to use another
> approach!
>

couldn't happen in our world - we design first then code and our code matches
the names used in the design.

also - and this is a common approach NOT just applicable to using Apex - we
prefix application objects with the equipment name, so we would have Omega_Debug
and Gamma_Debug packages.