<!-- MHonArc v2.4.4 --> <!--X-Subject: Re: [MUD-Dev] Room-based vs. coordinate-based --> <!--X-From-R13: Eunja Vnycraal <znynpunvNvanzr.pbz> --> <!--X-Date: from stimpy.globecomm.net [207.51.48.4] by in10.ibm.net id 866208863.54564-1 Fri Jun 13 13:34:23 1997 CUT --> <!--X-Message-Id: 33A14C58.41C67EA6#iname,com --> <!--X-Content-Type: text/plain --> <!--X-Reference: 199706122233.PAA20990#xsvr3,cup.hp.com --> <!--X-Head-End--> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <html> <head> <title>MUD-Dev message, Re: [MUD-Dev] Room-based vs. coordinate-based</title> <!-- meta name="robots" content="noindex,nofollow" --> <link rev="made" href="mailto:malachai#iname,com"> </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="msg01318.html">Previous</a> | <a href="msg01320.html">Next</a> ] Thread: [ <a href="msg01313.html">Previous</a> | <a href="msg01452.html">Next</a> ] Index: [ <A HREF="author.html#01319">Author</A> | <A HREF="#01319">Date</A> | <A HREF="thread.html#01319">Thread</A> ] <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> <H1>Re: [MUD-Dev] Room-based vs. coordinate-based</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>: Re: [MUD-Dev] Room-based vs. coordinate-based</LI> <LI><em>From</em>: Shawn Halpenny <<A HREF="mailto:malachai#iname,com">malachai#iname,com</A>></LI> <LI><em>Date</em>: Fri, 13 Jun 1997 09:34:16 -0400</LI> <LI><em>Sender</em>: <A HREF="mailto:rsh#iname,com">rsh#iname,com</A></LI> </UL> <!--X-Head-of-Message-End--> <!--X-Head-Body-Sep-Begin--> <HR> <!--X-Head-Body-Sep-End--> <!--X-Body-of-Message--> <PRE> clawrenc#cup,hp.com wrote: > > Shawn Halpenny <malachai#iname,com> said: > > clawrenc#cup,hp.com wrote: [ any change in object sends notification ] > >> This allows a watcher to trigger on a state change for a private data > >> member in an object. Depending on the strictness of your views on > >> data encapsulation, this can be thought of as a Good Thing, or a Bad > >> Thing. > > >Watchers can trigger on private data changes by not defining exactly > >what they're watching, but choosing to watch for a change in any > >property. So I still maintain the low message traffic for watchers > >waiting on a few properties, and don't have to cheat my encapsulation > >by allowing watching on the entire object if desired. > > This raises an implementation question: > > if your watchers are specified with a definition of what they are > watching, this suggests that a single watcher could be watching > several attributes at the same time. That's correct. A single watcher can wait on any number of attributes in a single object. > Does this mean that an entry is made on the "watch list" for each of > those attributes, or does it mean that upon a change, that change is > compared to the object's list of watcher filters, and the approriate > messages sent? The latter case seems wasteful (tho better than the > broadcast everything approach) if true. The former gets data space > hungry. It is the latter. There is, of course, a point where it is cheaper to watch for change on the entire object, rather than changes in many attributes. I haven't defined the actual implementation yet, but I anticipate these watcher filters to be somewhat wildcard-able (ATM all my attributes are defined by string names), so a single watcher can easily and efficiently monitor a number of related attributes. This optimization will depend on the composition of the attribute names, but those are something that can be easily tweaked. -- Shawn Halpenny "You can't buy the necessities of life with cookies" - "Edward Scissorhands" </PRE> <!--X-Body-of-Message-End--> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <!--X-Follow-Ups-End--> <!--X-References--> <UL><LI><STRONG>References</STRONG>: <UL> <LI><STRONG><A NAME="01313" HREF="msg01313.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></STRONG> <UL><LI><EM>From:</EM> clawrenc#cup,hp.com</LI></UL></LI> </UL></LI></UL> <!--X-References-End--> <!--X-BotPNI--> <UL> <LI>Prev by Date: <STRONG><A HREF="msg01318.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg01320.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg01313.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg01452.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="index.html#01319"><STRONG>Date</STRONG></A></LI> <LI><A HREF="thread.html#01319"><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>Re: [MUD-Dev] Room-based vs. coordinate-based</STRONG>, <EM>(continued)</EM> <ul compact> <ul compact> <ul compact> <ul compact> <ul compact> <ul compact> <ul compact> <ul compact> <ul compact> <LI><strong><A NAME="01266" HREF="msg01266.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Shawn Halpenny <a href="mailto:malachai#iname,com">malachai#iname,com</a>, Tue 10 Jun 1997, 03:03 GMT <LI><strong><A NAME="01299" HREF="msg01299.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Thu 12 Jun 1997, 08:02 GMT <LI><strong><A NAME="01308" HREF="msg01308.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Shawn Halpenny <a href="mailto:malachai#iname,com">malachai#iname,com</a>, Thu 12 Jun 1997, 21:03 GMT <LI><strong><A NAME="01313" HREF="msg01313.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Fri 13 Jun 1997, 05:35 GMT <LI><strong><A NAME="01319" HREF="msg01319.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Shawn Halpenny <a href="mailto:malachai#iname,com">malachai#iname,com</a>, Fri 13 Jun 1997, 20:34 GMT </LI> </LI> <LI><strong><A NAME="01452" HREF="msg01452.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Alex Oren <a href="mailto:alexo#bigfoot,com">alexo#bigfoot,com</a>, Mon 23 Jun 1997, 15:59 GMT <LI><strong><A NAME="01458" HREF="msg01458.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Shawn Halpenny <a href="mailto:malachai#iname,com">malachai#iname,com</a>, Mon 23 Jun 1997, 23:52 GMT <LI><strong><A NAME="01619" HREF="msg01619.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, clawrenc <a href="mailto:clawrenc#cup,hp.com">clawrenc#cup,hp.com</a>, Tue 01 Jul 1997, 06:45 GMT </LI> </LI> <LI><strong><A NAME="01465" HREF="msg01465.html">Re: [MUD-Dev] Room-based vs. coordinate-based</A></strong>, Nathan Yospe <a href="mailto:yospe#hawaii,edu">yospe#hawaii,edu</a>, Tue 24 Jun 1997, 01:33 GMT </LI> </LI> </LI> </LI> </LI> </ul> </ul> </ul> </ul> </ul> </ul> </ul> </ul> </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>