License: Creative Commons Attribution 4.0 International license (CC BY 4.0)
When quoting this document, please refer to the following
DOI: 10.4230/DARTS.9.2.18
URN: urn:nbn:de:0030-drops-182580
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Jongmans, Sung-Shik ; Ferreira, Francisco

Synthetic Behavioural Typing: Sound, Regular Multiparty Sessions via Implicit Local Types (Artifact)

DARTS-9-2-18.pdf (0.4 MB)

Evaluation Policy
The artifact has been evaluated as described in the ECOOP 2023 Call for Artifacts and the ACM Artifact Review and Badging Policy.


Programming distributed systems is difficult. Multiparty session typing (MPST) is a method to automatically prove safety and liveness of protocol implementations relative to protocol specifications.
In the related article ("Synthetic Behavioural Typing: Sound, Regular Multiparty Sessions via Implicit Local Types", in ECOOP 2023, LIPIcs, Vol. 263, pp. 42:1-42:30), we introduce two new techniques to significantly improve the expressiveness of the MPST method: projection is based on implicit local types instead of explicit; type checking is based on the operational semantics of implicit local types instead of on the syntax. That is, the reduction relation on implicit local types is used not only "a posteriori" to prove type soundness (as usual), but also "a priori" to define the typing rules - synthetically.
Classes of protocols that can now be specified/implemented/verified for the first time using the MPST method include: recursive protocols in which different roles participate in different branches; protocols in which a receiver chooses the sender of the first communication; protocols in which multiple roles synchronously choose both the sender and the receiver of a next communication, implemented as mixed input/output processes. In the related article, we present the theory of the new techniques, as well as their future potential, and we demonstrate their present capabilities to effectively support regular expressions as global types (not possible before).
As evidence that the new techniques are implementable, we implemented them; this implementation is available in this artifact.

BibTeX - Entry

  author =	{Jongmans, Sung-Shik and Ferreira, Francisco},
  title =	{{Synthetic Behavioural Typing: Sound, Regular Multiparty Sessions via Implicit Local Types (Artifact)}},
  pages =	{18:1--18:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2023},
  volume =	{9},
  number =	{2},
  editor =	{Jongmans, Sung-Shik and Ferreira, Francisco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-182580},
  doi =		{10.4230/DARTS.9.2.18},
  annote =	{Keywords: behavioural types, multiparty session types, choreographies}

Keywords: behavioural types, multiparty session types, choreographies
Collection: DARTS, Volume 9, Issue 2, Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023)
Issue Date: 2023
Date of publication: 11.07.2023

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