Types and Subtypes for Client-Server Interactions

  • Authors:
  • Simon J. Gay;Malcolm Hole

  • Affiliations:
  • -;-

  • Venue:
  • ESOP '99 Proceedings of the 8th European Symposium on Programming Languages and Systems
  • Year:
  • 1999

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Abstract

We define an extension of the π-calculus with a static type system which supports high-level specifications of extended patterns of communication, such as client-server protocols. Subtyping allows protocol specifications to be extended in order to describe richer behaviour; an implemented server can then be replaced by a refined implementation, without invalidating type-correctness of the overall system. We use the POP3 protocol as a concrete example of this technique.