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On the Monitorability of Session Types, in Theory and Practice

Authors Christian Bartolo Burlò , Adrian Francalanza , Alceste Scalas

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ACM Subject Classification
  • Software and its engineering → Development frameworks and environments
  • Software and its engineering → Software verification and validation
  • Theory of computation → Concurrency
Keywords
  • Session types
  • monitorability
  • monitor correctness
  • Scala

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Abstract

Software components are expected to communicate according to predetermined protocols and APIs. Numerous methods have been proposed to check the correctness of communicating systems against such protocols/APIs. Session types are one such method, used both for static type-checking as well as for run-time monitoring. This work takes a fresh look at the run-time verification of communicating systems using session types, in theory and in practice. On the theoretical side, we develop a formal model of session-monitored processes. We then use this model to formulate and prove new results on the monitorability of session types, defined in terms of soundness (i.e., whether monitors only flag ill-typed processes) and completeness (i.e., whether all ill-typed processes can be flagged by a monitor). On the practical side, we show that our monitoring theory is indeed realisable: we instantiate our formal model as a Scala toolkit (called STMonitor) for the automatic generation of session monitors. These executable monitors can be used as proxies to instrument communication across black-box processes written in any programming language. Finally, we evaluate the viability of our approach through a series of benchmarks.

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Christian Bartolo Burlò, Adrian Francalanza, and Alceste Scalas. On the Monitorability of Session Types, in Theory and Practice. In 35th European Conference on Object-Oriented Programming (ECOOP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 194, pp. 20:1-20:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ECOOP.2021.20

Author Details

Christian Bartolo Burlò
  • Gran Sasso Science Institute, L'Aquila, Italy
Adrian Francalanza
  • Department of Computer Science, University of Malta, Msida, Malta
Alceste Scalas
  • DTU Compute, Technical University of Denmark, Kongens Lyngby, Denmark

Funding

This work has been partly supported by: the project MoVeMnt (No: 217987-051) under the Icelandic Research Fund; the BehAPI project funded by the EU H2020 RISE under the Marie Skłodowska-Curie action (No: 778233); the EU Horizon 2020 project 830929 CyberSec4Europe; the Danish Industriens Fonds Cyberprogram 2020-0489 Security-by-Design in Digital Denmark.

Supplementary Materials

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