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<H1>[MUD-Dev] Re: DevMUD: Inheritable modules</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: DevMUD: Inheritable modules</LI>
<LI><em>From</em>: "Jon A. Lambert" <<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>></LI>
<LI><em>Date</em>: Sat, 31 Oct 1998 22:59:10 -5</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
On 31 Oct 98, Cynbe ru Taren wrote:
> "Jon A. Lambert" <jlsysinc#ix,netcom.com> comments:
>
> | I think the idea of a something called the core is sort of a cop out
> | in designing a system. Basically it's a blackhole, where one can
> | dump anything with out really thinking about interface.
> |
> | Some may also know this as the blob phenomenon, where a single
> | amorphous controller class or system management module monopolizes
> | all the processing. The surrounding modules become little more than
> | a means to encapsulate data and ultimately serve the blob.
> | One solution is to slow down, stop, and refactor the responsibilities
> | of the disparate functions which have been tossed into the blob.
> |
> | [...]
> |
> | Any thoughts.... :)
>
>
> For an opposing opinion, see the discussion of the Mediator design
> pattern in Design Patterns by Gamma,Helm,Johnson,Vlissides. (Probably
> the single most important book for anyone doing high-level OOP design?)
Yes it is an essential book. :)
The mediator has a pretty well-defined function though, to facilitate
communication/interaction between classes (modules in this case).
I think the use of the core as mediator is another good way to
go. Network primitives wouldn't go into the core though, they
would go in some network class/module. Otherwise you may have
the Blob. (see "Anti-patterns", Brown, Malveau, McCormick,
and Mowbray... the Anti-gang-of-four) ;)
> They note that factoring knowledge of interconnects diffusely into a
> network of classes results in a system that acts as though it is
> monolithic, because each class knows too much about its surroundings
> to work well in any other context.
Agreed. The core as Observer has potential here also. I think
someone else mentioned something similar with Publish/Subscribe.
> Isolating all the interaction logic in a central Mediator class can
> let the leaf classes be much simpler and more focussed and hence
> easier to use in other contexts.
>
> This also lets the interactions be modified by subclassing only the
> Mediator object, instead of having to subclass all the leaf classes
> as well.
>
> Anyhow, that's one possible justification for having a 'core'.
Ok. I'll buy that one.
> BTW: Not to cast cold water, but I think interchangable software
> parts which work smoothly in novel combinations is a Really Hard
> Problem which people have been attempting for decades with as yet
> no clear success stories[*]. (JavaBeans is the latest effort along
> these lines, and I think the jury is clearly still out.)
Well I think you might want to consider that using components to
do rapid development of user interfaces to be a success story.
--
--/*\ Jon A. Lambert - TychoMUD Internet:jlsysinc#ix,netcom.com /*\--
--/*\ Mud Server Developer's Page <<A HREF="http://www.netcom.com/~jlsysinc">http://www.netcom.com/~jlsysinc</A>> /*\--
--/*\ "Everything that deceives may be said to enchant" - Plato /*\--
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<LI><STRONG><A NAME="00621" HREF="msg00621.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></STRONG>
<UL><LI><EM>From:</EM> Cynbe ru Taren <cynbe#muq,org></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: DevMUD: Inheritable modules</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<LI><strong><A NAME="00633" HREF="msg00633.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
The Arrow <a href="mailto:arrow#trelleborg,mail.telia.com">arrow#trelleborg,mail.telia.com</a>, Sat 31 Oct 1998, 21:01 GMT
</LI>
<LI><strong><A NAME="00852" HREF="msg00852.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Sun 22 Nov 1998, 23:04 GMT
<UL>
<LI><strong><A NAME="00853" HREF="msg00853.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
J C Lawrence <a href="mailto:claw#kanga,nu">claw#kanga,nu</a>, Sun 22 Nov 1998, 23:08 GMT
</LI>
</UL>
</LI>
</ul>
<LI><strong><A NAME="00621" HREF="msg00621.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Cynbe ru Taren <a href="mailto:cynbe#muq,org">cynbe#muq,org</a>, Sat 31 Oct 1998, 07:50 GMT
<UL>
<LI><strong><A NAME="00657" HREF="msg00657.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 01 Nov 1998, 04:02 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00639" HREF="msg00639.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 31 Oct 1998, 21:22 GMT
</LI>
<LI><strong><A NAME="00644" HREF="msg00644.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 31 Oct 1998, 21:23 GMT
</LI>
<LI><strong><A NAME="00645" HREF="msg00645.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 31 Oct 1998, 21:23 GMT
</LI>
<LI><strong><A NAME="00662" HREF="msg00662.html">[MUD-Dev] Re: DevMUD: Inheritable modules</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 01 Nov 1998, 06:01 GMT
</LI>
</ul>
</LI>
</UL></BLOCKQUOTE>
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