World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0003668901
Reproduction Date:

Title: CoolMUD  
Author: World Heritage Encyclopedia
Language: English
Subject: Mudlle, A Theory of Fun for Game Design, Holy Mission, Immortal (MUD), Infinity (AberMUD)
Publisher: World Heritage Encyclopedia


Paradigm Prototype-based
Designed by Stephen F. White
Developer Stephen F. White
First appeared 1992
Typing discipline dynamic
Major implementations
Influenced by

CoolMUD is a type of MUD, and a descendant of MOO. It is a text-based online virtual reality system to which multiple users are connected at the same time. Created by Stephen White, also known by the handles "Ghondahrl" and "ghond", CoolMUD has many similarities to MOO, but pushes more functionality from the driver into the core (the portion written in the CoolMUD language itself) and has extra features for programming distributed objects. The project is currently managed by Robin Lee Powell.

The main differences between the programming languages in MOO and CoolMUD include:

  • Instance variables ("properties" in MOO) are all private and not externally visible. Methods ("verbs" in MOO) must be written to expose them. This is similar to early object-oriented programming languages such as Smalltalk.
  • There are no builtin properties for owner and location like in MOO. This was done partly to simplify the language and partly to permit more versatile applications.
  • There are no facilities for ownership of objects or code security, as strong encapsulation permits these facilities to be written in the CoolMUD language itself.
  • Servers can choose to distribute their objects and use objects from distributed servers. Distributed objects can be referenced by putting an email-like address after the object number, for example: "#14@AnotherMUD".

Unlike MOO, CoolMUD's object database is fully disk-based. Whereas MOO's implementation of persistence is based on periodic "checkpoints" during which the complete state of the server's object memory is written to disk, CoolMUD keeps the majority of the object database on disk and keeps a cache of the most frequently used objects in memory, a strategy known as incremental persistence. The CoolMUD implementation of the disk-based object memory is based on Marcus Ranum's work from UnterMUD.

External links

  • CoolMUD Server
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.