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Documents authored by Gay, Simon J.

Found 2 Possible Name Variants:

Gay, Simon J.

Document
Artifact
DOI: 10.4230/DARTS.7.2.8
Multiparty Session Types for Safe Runtime Adaptation in an Actor Language (Artifact)

Authors: Paul Harvey, Simon Fowler, Ornela Dardha, and Simon J. Gay

Published in: DARTS, Volume 7, Issue 2, Special Issue of the 35th European Conference on Object-Oriented Programming (ECOOP 2021)

Abstract
This is the companion artifact for the paper "Multiparty Session Types for Safe Runtime Adaptation in an Actor Language". EnsembleS is an actor-based programming language supporting dynamic self-adaptation, (discovery, replacement, and communication), which also guarantees communication safety. The artifact includes the EnsembleS compiler, the modified StMungo code, and all examples contained within the paper.
Cite as

Paul Harvey, Simon Fowler, Ornela Dardha, and Simon J. Gay. Multiparty Session Types for Safe Runtime Adaptation in an Actor Language (Artifact). In Special Issue of the 35th European Conference on Object-Oriented Programming (ECOOP 2021). Dagstuhl Artifacts Series (DARTS), Volume 7, Issue 2, pp. 8:1-8:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@Article{harvey_et_al:DARTS.7.2.8,
  author =	{Harvey, Paul and Fowler, Simon and Dardha, Ornela and Gay, Simon J.},
  title =	{{Multiparty Session Types for Safe Runtime Adaptation in an Actor Language (Artifact)}},
  pages =	{8:1--8:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2021},
  volume =	{7},
  number =	{2},
  editor =	{Harvey, Paul and Fowler, Simon and Dardha, Ornela and Gay, Simon J.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.7.2.8},
  URN =		{urn:nbn:de:0030-drops-140327},
  doi =		{10.4230/DARTS.7.2.8},
  annote =	{Keywords: Concurrency, session types, adaptation, actors, trust}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2021.10
Multiparty Session Types for Safe Runtime Adaptation in an Actor Language

Authors: Paul Harvey, Simon Fowler, Ornela Dardha, and Simon J. Gay

Published in: LIPIcs, Volume 194, 35th European Conference on Object-Oriented Programming (ECOOP 2021)

Abstract
Human fallibility, unpredictable operating environments, and the heterogeneity of hardware devices are driving the need for software to be able to adapt as seen in the Internet of Things or telecommunication networks. Unfortunately, mainstream programming languages do not readily allow a software component to sense and respond to its operating environment, by discovering, replacing, and communicating with components that are not part of the original system design, while maintaining static correctness guarantees. In particular, if a new component is discovered at runtime, there is no guarantee that its communication behaviour is compatible with existing components. We address this problem by using multiparty session types with explicit connection actions, a type formalism used to model distributed communication protocols. By associating session types with software components, the discovery process can check protocol compatibility and, when required, correctly replace components without jeopardising safety. We present the design and implementation of EnsembleS, the first actor-based language with adaptive features and a static session type system, and apply it to a case study based on an adaptive DNS server. We formalise the type system of EnsembleS and prove the safety of well-typed programs, making essential use of recent advances in non-classical multiparty session types.
Cite as

Paul Harvey, Simon Fowler, Ornela Dardha, and Simon J. Gay. Multiparty Session Types for Safe Runtime Adaptation in an Actor Language. In 35th European Conference on Object-Oriented Programming (ECOOP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 194, pp. 10:1-10:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{harvey_et_al:LIPIcs.ECOOP.2021.10,
  author =	{Harvey, Paul and Fowler, Simon and Dardha, Ornela and Gay, Simon J.},
  title =	{{Multiparty Session Types for Safe Runtime Adaptation in an Actor Language}},
  booktitle =	{35th European Conference on Object-Oriented Programming (ECOOP 2021)},
  pages =	{10:1--10:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-190-0},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{194},
  editor =	{M{\o}ller, Anders and Sridharan, Manu},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2021.10},
  URN =		{urn:nbn:de:0030-drops-140539},
  doi =		{10.4230/LIPIcs.ECOOP.2021.10},
  annote =	{Keywords: Concurrency, session types, adaptation}
}

Gay, Simon

Document
DOI: 10.4230/DagRep.7.1.158
Theory and Applications of Behavioural Types (Dagstuhl Seminar 17051)

Authors: Simon Gay, Vasco T. Vasconcelos, Philip Wadler, and Nobuko Yoshida

Published in: Dagstuhl Reports, Volume 7, Issue 1 (2017)

Abstract
This report documents the programme and the outcomes of Dagstuhl Seminar 17051 "Theory and Applications of Behavioural Types". Behavioural types describe the dynamic aspects of programs, in contrast to data types, which describe the fixed structure of data. Perhaps the most well-known form of behavioural types is session types, which are type-theoretic specifications of communication protocols. More generally, behavioural types include typestate systems, which specify state-dependent availability of operations; choreographies, which specify collective communication behaviour; and behavioural contracts. In recent years, research activity in behavioural types has increased dramatically, in both theoretical and practical directions. Theoretical work has explored new relationships between established behavioural type systems and areas such as linear logic, automata theory, process calculus testing theory, dependent type theory, and model-checking. On the practical side, there are several implementations of programming languages, programming language extensions, software development tools, and runtime monitoring systems, which are becoming mature enough to apply to real-world case studies. The seminar brought together researchers from the established, largely European, research community in behavioural types, and other participants from outside Europe and from related research topics such as effect systems and actor-based languages. The questions that we intended to explore included: - How can we understand the relationships between the foundations of session types in terms of linear logic, automata, denotational models, and other type theories? - How can the scope and applicability of behavioural types be increased by incorporating ideas and approaches from gradual typing and dependent type theory? - What is the relationship, in terms of expressivity and tractability, between behavioural types and other verification techniques such as model-checking? - What are the theoretical and practical obstacles to delivering behavioural types to software developers in a range of mainstream programming languages? - What are the advantages and disadvantages of incorporating behavioural types into standard programming languages or designing new languages directly based on the foundations of session types? - How can we evaluate the effectiveness of behavioural types in programming languages and software development?
Cite as

Simon Gay, Vasco T. Vasconcelos, Philip Wadler, and Nobuko Yoshida. Theory and Applications of Behavioural Types (Dagstuhl Seminar 17051). In Dagstuhl Reports, Volume 7, Issue 1, pp. 158-189, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@Article{gay_et_al:DagRep.7.1.158,
  author =	{Gay, Simon and Vasconcelos, Vasco T. and Wadler, Philip and Yoshida, Nobuko},
  title =	{{Theory and Applications of Behavioural Types (Dagstuhl Seminar 17051)}},
  pages =	{158--189},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2017},
  volume =	{7},
  number =	{1},
  editor =	{Gay, Simon and Vasconcelos, Vasco T. and Wadler, Philip and Yoshida, Nobuko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.7.1.158},
  URN =		{urn:nbn:de:0030-drops-72497},
  doi =		{10.4230/DagRep.7.1.158},
  annote =	{Keywords: Behavioural Types, Programming Languages, Runtime Verification, Type Systems}
}
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