<!-- MHonArc v2.4.4 -->
<!--X-Subject: DBs and Events -->
<!--X-From-R13: f001tzhNabin.jevtug.rqh -->
<!--X-Date: Wed, 11 Feb 1998 14:26:09 +0000 -->
<!--X-Message-Id: Pine.PMDF.3.95.980211090921.543348537A-100000#nova,wright.edu -->
<!--X-Content-Type: text/plain -->
<!--X-Reference: Pine.LNX.3.91.980210211015.65K-100000@uni-corn.demon.co.uk -->
<!--X-Head-End-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<title>MUD-Dev message, DBs and Events</title>
<!-- meta name="robots" content="noindex,nofollow" -->
<link rev="made" href="mailto:s001gmu#nova,wright.edu">
</head>
<body background="/backgrounds/paperback.gif" bgcolor="#ffffff"
text="#000000" link="#0000FF" alink="#FF0000" vlink="#006000">
<font size="+4" color="#804040">
<strong><em>MUD-Dev<br>mailing list archive</em></strong>
</font>
<br>
[ <a href="../">Other Periods</a>
| <a href="../../">Other mailing lists</a>
| <a href="/search.php3">Search</a>
]
<br clear=all><hr>
<!--X-Body-Begin-->
<!--X-User-Header-->
<!--X-User-Header-End-->
<!--X-TopPNI-->
Date:
[ <a href="msg00399.html">Previous</a>
| <a href="msg00401.html">Next</a>
]
Thread:
[ <a href="msg00399.html">Previous</a>
| <a href="msg00432.html">Next</a>
]
Index:
[ <A HREF="author.html#00400">Author</A>
| <A HREF="#00400">Date</A>
| <A HREF="thread.html#00400">Thread</A>
]
<!--X-TopPNI-End-->
<!--X-MsgBody-->
<!--X-Subject-Header-Begin-->
<H1>DBs and Events</H1>
<HR>
<!--X-Subject-Header-End-->
<!--X-Head-of-Message-->
<UL>
<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: DBs and Events</LI>
<LI><em>From</em>: <A HREF="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</A></LI>
<LI><em>Date</em>: Wed, 11 Feb 1998 09:26:16 -0500 (EST)</LI>
</UL>
<!--X-Head-of-Message-End-->
<!--X-Head-Body-Sep-Begin-->
<HR>
<!--X-Head-Body-Sep-End-->
<!--X-Body-of-Message-->
<PRE>
On Wed, 11 Feb 1998, Greg Munt wrote:
> On Tue, 10 Feb 1998, Nathan Yospe wrote:
>
> > On Tue, 10 Feb 1998, Greg Munt wrote:
[caching etc...]
> > :Any references to Event Management? Is there any alternative to using a
> > :pointer to a function, to store the Event->function()? (This has the
> > :disadvantage of every Event->function() needing to have the same number
> > :and type of parameters being passed to it.)
> >
> > Here we go. This I can help you with. Events don't have to be functions,
> > for a start. An event could be stored as anything, from a script on down
> > to a held thread. I store mine as classes... any action is executed from
> > an event class, which grabs the nearest available execution thread, sets
> > it to the event's references, and frees it to go. Events are, by design,
> > only actually capable of grabbing one specific thread, such that any set
> > of events cannot execute asynchronously on the same resources. Functions
> > are actually pulled up _after_ execution begins... Event.Process() is at
> > its basis a normalization check, which tries to match a list of objects,
> > and upon success, changes the values of the objects to a new norm, then,
> > with its still-active thread, allows those objects to update. The object
> > update methods are the actual functions involved, and once each object's
> > updates are complete (and affected objects with zero delay complete such
> > updates as the modified objects have made available) the thread is wiped
> > clear of variables, set to sleep, and returned to the pool.
>
> I'm not sure I understand this too well. Are you suggesting this?
>
> class Event
> {
> private:
> DataType1 *a;
> DataType2 *b;
> ...
>
> public:
> ...
> process();
> };
I don't do things exactly the same way as Nathan, but my approach is
pretty similar. Events work pretty well when done as Classes, I think.
> I still can't see how the event isn't a function. The tasks that the
> event does have to be stored in a function?
well, when you get down to it, what the event does HAS to be in a function
somewhere. What he was saying (I believe), is that you don't necessarily
have to have a struct with a function pointer in it, limiting the type of
functions that can be assigned.
Classes are not really much different, but because of data encapsulation
it's a lot cleaner to get around the limit on the # of paramaters to the
event handling function.
> Am I wrong in thinking that the data that an Event needs (eg pointer to a
> Player) are stored in the class, with a function - which takes no
> parameters - calling class methods to do whatever it is that the Event is
> trying to achieve? Also, it looks like Event would need to be a template.
> Forget that, am using Linux g++ :(
you are correct in assuming that all relevent data should be stored in
the event class. You are incorrect in assuming that the event class has
to be a template class. I suppose you could do it that way, but I think
it'd be a lot cleaner if you just descend a bunch of event sub-classes
from the base event class. Each sub-class would have a different set of
variables, and it's own version of the event.process() method. The event
driver only need know about a very limited subset (if not just one) of the
event classes.
what's wrong with linux g++, as far as templates go, btw?
haven't had a need for a template class yet, but then I'm not very far
into things. :)
> I'm free of Cobol now! Hurrah!
heh. I've never touched COBOL, and if I can help it, I never will. :)
-Greg
</PRE>
<!--X-Body-of-Message-End-->
<!--X-MsgBody-End-->
<!--X-Follow-Ups-->
<HR>
<ul compact><li><strong>Follow-Ups</strong>:
<ul>
<li><strong><A NAME="00432" HREF="msg00432.html">OT: Linux g++</A></strong>
<ul compact><li><em>From:</em> Greg Munt <greg#uni-corn,demon.co.uk></li></ul>
</UL></LI></UL>
<!--X-Follow-Ups-End-->
<!--X-References-->
<UL><LI><STRONG>References</STRONG>:
<UL>
<LI><STRONG><A NAME="00399" HREF="msg00399.html">Re: [MUD-Dev] DBs and Events</A></STRONG>
<UL><LI><EM>From:</EM> Greg Munt <greg#uni-corn,demon.co.uk></LI></UL></LI>
</UL></LI></UL>
<!--X-References-End-->
<!--X-BotPNI-->
<UL>
<LI>Prev by Date:
<STRONG><A HREF="msg00399.html">Re: [MUD-Dev] DBs and Events</A></STRONG>
</LI>
<LI>Next by Date:
<STRONG><A HREF="msg00401.html">META: Unsubscribed users dur to bounces</A></STRONG>
</LI>
<LI>Prev by thread:
<STRONG><A HREF="msg00399.html">Re: [MUD-Dev] DBs and Events</A></STRONG>
</LI>
<LI>Next by thread:
<STRONG><A HREF="msg00432.html">OT: Linux g++</A></STRONG>
</LI>
<LI>Index(es):
<UL>
<LI><A HREF="index.html#00400"><STRONG>Date</STRONG></A></LI>
<LI><A HREF="thread.html#00400"><STRONG>Thread</STRONG></A></LI>
</UL>
</LI>
</UL>
<!--X-BotPNI-End-->
<!--X-User-Footer-->
<!--X-User-Footer-End-->
<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>No Subject</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00905" HREF="msg00905.html">No Subject</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Thu 26 Mar 1998, 17:32 GMT
</LI>
</ul>
</LI>
<LI><strong><A NAME="00396" HREF="msg00396.html">DBs and Events</A></strong>,
Greg Munt <a href="mailto:greg#uni-corn,demon.co.uk">greg#uni-corn,demon.co.uk</a>, Tue 10 Feb 1998, 18:30 GMT
<UL>
<LI><strong><A NAME="00397" HREF="msg00397.html">Re: [MUD-Dev] DBs and Events</A></strong>,
Nathan Yospe <a href="mailto:yospe#hawaii,edu">yospe#hawaii,edu</a>, Tue 10 Feb 1998, 19:40 GMT
<UL>
<LI><strong><A NAME="00399" HREF="msg00399.html">Re: [MUD-Dev] DBs and Events</A></strong>,
Greg Munt <a href="mailto:greg#uni-corn,demon.co.uk">greg#uni-corn,demon.co.uk</a>, Wed 11 Feb 1998, 10:50 GMT
<UL>
<LI><strong><A NAME="00400" HREF="msg00400.html">DBs and Events</A></strong>,
s001gmu <a href="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</a>, Wed 11 Feb 1998, 14:26 GMT
<UL>
<LI><strong><A NAME="00432" HREF="msg00432.html">OT: Linux g++</A></strong>,
Greg Munt <a href="mailto:greg#uni-corn,demon.co.uk">greg#uni-corn,demon.co.uk</a>, Thu 12 Feb 1998, 11:52 GMT
<UL>
<LI><strong><A NAME="00444" HREF="msg00444.html">Re: [MUD-Dev] OT: Linux g++</A></strong>,
Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Fri 13 Feb 1998, 00:30 GMT
<UL>
<LI><strong><A NAME="00487" HREF="msg00487.html">Re: [MUD-Dev] OT: Linux g++</A></strong>,
coder <a href="mailto:coder#ibm,net">coder#ibm,net</a>, Mon 16 Feb 1998, 11:29 GMT
<UL>
<LI><strong><A NAME="00526" HREF="msg00526.html">Re: [MUD-Dev] OT: Linux g++</A></strong>,
Shawn Halpenny <a href="mailto:malachai#iname,com">malachai#iname,com</a>, Wed 18 Feb 1998, 17:02 GMT
</LI>
</UL>
</LI>
</UL>
</LI>
</UL>
</LI>
</UL>
</LI>
</UL>
</LI>
</UL>
</LI>
</UL>
</LI>
</UL></BLOCKQUOTE>
</ul>
<hr>
<center>
[ <a href="../">Other Periods</a>
| <a href="../../">Other mailing lists</a>
| <a href="/search.php3">Search</a>
]
</center>
<hr>
</body>
</html>
