Advertisement

Towards logic programming based coordination in virtual worlds

  • Paul Tarau
  • Veronica Dahl
  • Koen De Bosschere
Agent-Based Coordination
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1364)

Abstract

We propose a unified framework for coordination in multiuser Virtual Worlds, based on our experience with LogiMOO, a BinProlog+Linda based programmable shared Virtual World. LogiMOO adopts unification for pattern retrieval while using exclusively deterministic operations, unlike most Prolog based Linda systems. Moving beyond the Linda framework LogiMOO is based on, we describe a coordination logic for agent programming based on ideas from (affine) linear logic and Java's synchronized object system as well as a set of new primitives describing uniformly Linda operation, database updates and hypothetical assumptions.

The main novelty is that our constructs emphasize an ‘object based’ approach, with synchronization information built in ‘container objects’ and allowing more flexible wait/notify negotiations between consumer/producer agent components, as well as inheritance and agent component reuse.

Our experiments with agent coding in LogiMOO and Java and interaction with external visual and logic components, show the practicality of our constructs for real life programming.

Keywords

coordination languages blackboard-based logic programming distributed programming groupware virtual worlds Internet applications 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. A. Bharat and L. Cardelli. Migratory applications. In Proceedings of the 8th Annual ACM Symposium on User Interface Software and Technology, Nov. 1995. http://gatekeeper.dec.com/pub/DEC/SRC/research-reports/abstracts/srcrr-138.html.Google Scholar
  2. 2.
    BlackSun. CyberGate. http://www.blacksun.com/.Google Scholar
  3. 3.
    P. Bonnet, L. Bressnan S., Leth, and B. Thomsen. Towards ECLIPSE Agents on the Internet. In Tarau et al. [22]. http://clement.info.umoncton.ca/lpnet.Google Scholar
  4. 4.
    A. Brogi and P. Ciancarini. The concurrent language, shared Prolog. TOPLAS, 13(1):99–123, 1991.CrossRefGoogle Scholar
  5. 5.
    D. Cabeza and M. Hermenegildo. html.pl: A HTML Package for (C)L.P systems. Technical report, 1996. Available from http://www.clip.dia.fi.upm.es.Google Scholar
  6. 6.
    D. Cabeza and M. Hermenegildo. The Pillow/CIAO Library for Internet/WWW Programming using Computational Logic Systems. In Tarau et al. [22]. http://clement.info.umoncton.ca/ lpnet.Google Scholar
  7. 7.
    N. Carriero and D. Gelernter. Linda in context. CALM, 32(4):444–458, 1989.Google Scholar
  8. 8.
    K. De Bosschere, D. Perron, and P. Tarau. LogiMOO: Prolog Technology for Virtual Worlds. In Proceedings of PAP'96, pages 51–64, London, Apr. 1996. ISBN 0 9525554 1 7.Google Scholar
  9. 9.
    K. De Bosschere and P. Tarau. Blackboard-based Extensions in Prolog. Software — Practice and Experience, 26(1):49–69, Jan. 1996.CrossRefGoogle Scholar
  10. 10.
    J.-Y. Girard. Linear logic. Theoretical Computer Science, (50):1–102, 1987.Google Scholar
  11. 11.
    IBM. Aglets. http://www.trl.ibm.co.jp/aglets.Google Scholar
  12. 12.
    Intel. Moondo. http://www.intel.com/iaweb/moondo/index.htm.Google Scholar
  13. 13.
    A. P. Kopylov. Decidability of linear affine logic. In Proceedings, Tenth Annual IEEE Symposium on Logic in Computer Science, pages 496–504, San Diego, California, 26–29 June 1995. IEEE Computer Society Press.Google Scholar
  14. 14.
    S. W. Locke, A. Davison, and S. L. Lightweight Deductive Databases for the World-Wide Web. In Tarau et al. [22]. http://clement.info.umoncton.ca/ lpnet.Google Scholar
  15. 15.
    S. W. Loke and A. Davison. Logic programming with the world-wide web. In Proceedings of the 7th ACM Conference on Hypertext, pages 235–245. ACM Press, 1996.Google Scholar
  16. 16.
    Sony. Cyber Passage. http://vs.sony.co.jp/VS-E/vstop.html.Google Scholar
  17. 17.
    P. Szeredi, K. Molnár, and R. Scott. Serving Multiple HTML Clients from a Prolog Application. In Tarau et al. [22]. http://clement.info.umoncton.ca/ lpnet.Google Scholar
  18. 18.
    P. Tarau. Logic Programming and Virtual Worlds. In Proceedings of INAP96, Tokyo, Nov. 1996. keynote address.Google Scholar
  19. 19.
    P. Tarau. BinProlog 5.40 User Guide. Technical Report 97-1, Département d'Informatique, Université de Moncton, Apr. 1997. Available from http://clement.info.umoncton.ca/BinProlog.Google Scholar
  20. 20.
    P. Tarau and V. Dahl. Logic Programming and Logic Grammars with First-order Continuations. In Proceedings of LOPSTR'94, Pisa, June 1994.Google Scholar
  21. 21.
    P. Tarau, V. Dahl, and A. Fall. Backtrackable State with Linear Affine Implication and Assumption Grammars. In J. Jaffar and R. H. Yap, editors, Concurrency and Parallelism, Programming, Networking, and Security, Lecture Notes in Computer Science 1179, pages 53–64, Singapore, Dec. 1996. Springer.Google Scholar
  22. 22.
    P. Tarau, A. Davison, K. De Bosschere, and M. Hermenegildo, editors. Proceedings of the 1st Workshop on Logic Programming Tools for INTERNET Applications, JICSLP'96, Bonn, Sept. 1996. http://clement.info.umoncton.ca/ lpnet.Google Scholar
  23. 23.
    P. Tarau and K. De Bosschere. Virtual World Brokerage with BinProlog and Netscape. In Tarau et al. [22]. http://clement.info.umoncton.ca/ lpnet.Google Scholar
  24. 24.
    Worlds. AlphaWorld. http://www.worlds.net/products/alphaworld.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • Paul Tarau
    • 1
  • Veronica Dahl
    • 2
  • Koen De Bosschere
    • 3
  1. 1.Département d'InformatiqueUniversité de MonctonMonctonCanada
  2. 2.Logic and Functional Programming Group Department of Computing SciencesSimon Fraser UniversityBurnabyCanada
  3. 3.Vakgroep Elektronica en InformatiesystemenUniversiteit GentGentBelgium

Personalised recommendations