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Content-type: text/plain
Gerard:
one should remember about the different lineages of the BB and the
Oberon System-3. Broadly speking, BB descends from the Mossenboaeck
work on type-bound inheritance. The small framework from his book
is entirely based on type-bound methods. If you look at different
"hooks" in the BlackBox, they look type-bound to me, very much
in the Mossenboeck's style.
The System-3 on the other always stressed the instance-bound object
orientation, as originally introduced in the Oberon System by Wirth
and Gutknecht. The Gadget framework was based on installable handlers
and on "attributes" defined within these handlers. This is a very
different approach from the type-bound handlers from the Mossenboeck's
book. It is very easy to get confused between the two approaches,
because the authors use a very similar terminology for two different
things, one being instance-based and the other type-based.
I am not sure if anyone in the Oberon/BB community tried to clarify
the difference or to compare the two approaches side-by-side. I would
expect to find such a comparison in one of many ETH doctoral theses,
which hopefully are still archived on teh ETH server. Another place
to look is the Univ. of Linz web server, even though they discontineud
the support for the Oberon System V.4. But the papers should still
be there.
Another good source of info might be a commercial Oberon framework
named Amadeus-3, which is not free, but it is available in source
if you pay the licensing fee. BTW, when you said "free" in your e-mail,
you probably meant "open source".
Cheers,
Wojtek Skulski skulski{([at]})nowhere.xy
On Mon, 1 Dec 2003, [iso-8859-2] Gérard Meunier wrote:
> I don't know exactly what BB does, since it's not a free software, but I
> suppose it works very much like Oberon. The message passing algorithm of
> Oberon is very well explained in the chapter 5 of The Oberon Companion. The
> Oberon Companion is included in every version of Oberon System 3:
>
> http://www.oberon.ethz.ch/download.html
>
> Regards.
>
> Gérard
>
> ----- Original Message -----
> From: Marcin Kielar <zorba128{([at]})nowhere.xy> To: <blackbox{([at]})nowhere.xy> Sent: Monday, November 24, 2003 9:00 PM
> Subject: Message passing algorithm used in blackbox
>
>
> > Hi
> > I'm trying to find somewhere detailed description of message passing
> > algorithm used in blackbox. The only description i've found is small
> > chapter in C.Szyperski "Component software", but this book presents
> > only the main idea, and i'd like to read more about actual
> > implementation. My goal is to supply similar functionality (small
> > framework) in java.
> >
> > Or maybe someone who has this book in english (i own translated one, but
> > it's very hard to read as many terms are translated word-to-word...)
> > colud scan and email me chapter 21.3.5 (i'm not sure how about
> > copyright....)
> >
> >
> > anyone could help?
> >
> > --
> > greetings
> > Marcin Kielar
> >
--------------------------------------------
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Received on Tue Dec 02 2003 - 00:57:17 UTC