MobilityReadingGroup

π-calculus, Session Types research at Imperial College

Design-by-Contract for Flexible Multiparty Session Protocols
Lorenzo GHERI, Ivan LANESE, Neil SAYERS, Emilio TUOSTO, Nobuko YOSHIDA
To appear in
36th European Conference on Object-Oriented Programming (ECOOP 2022)

Choreographic models support a correctness-by-construction principle in distributed programming. Also, they enable the automatic generation of correct message-based communication patterns from a global specification of the desired system behaviour. In this paper we extend the theory of choreography automata, a choreographic model based on finite-state automata, with two key features. First, we allow participants to act only in some of the scenarios described by the choreography automaton. While this seems natural, many choreographic approaches in the literature, and choreography automata in particular, forbid this behaviour. Second, we equip communications with assertions constraining the values that can be communicated, enabling a design-by-contract approach. We provide a toolchain allowing to exploit the theory above to generate APIs for TypeScript web programming. Programs communicating via the generated APIs follow, by construction, the prescribed communication pattern and are free from communication errors such as deadlocks.

@inproceedings{GLSTY2022,
  author = {Lorenzo Gheri and Ivan Lanese and Neil Sayers and Emilio Tuosto and Nobuko Yoshida},
  title = {{Design-by-Contract for Flexible Multiparty Session Protocols}},
  booktitle = {36th European Conference on Object-Oriented Programming},
  series = {LIPIcs},
  pages = {--},
  year = 2022
}
@inproceedings{GLSTY2022,
  author = {Lorenzo Gheri and Ivan Lanese and Neil Sayers and Emilio Tuosto and Nobuko Yoshida},
  title = {{Design-by-Contract for Flexible Multiparty Session Protocols}},
  booktitle = {36th European Conference on Object-Oriented Programming},
  series = {LIPIcs},
  pages = {--},
  year = 2022
}