4 Search Results for "Melgratti, Hernán"

Document
DOI: 10.4230/LIPIcs.ECOOP.2023.15
Behavioural Types for Local-First Software

Authors: Roland Kuhn, Hernán Melgratti, and Emilio Tuosto

Published in: LIPIcs, Volume 263, 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
Peer-to-peer systems are the most resilient form of distributed computing, but the design of robust protocols for their coordination is difficult. This makes it hard to specify and reason about global behaviour of such systems. This paper presents swarm protocols to specify such systems from a global viewpoint. Swarm protocols are projected to machines, that is local specifications of peers. We take inspiration from behavioural types with a key difference: peers communicate through an event notification mechanism rather than through point-to-point message passing. Our goal is to adhere to the principles of local-first software where network devices collaborate on a common task while retaining full autonomy: every participating device can locally make progress at all times, not encumbered by unavailability of other devices or network connections. This coordination-free approach leads to inconsistencies that may emerge during computations. Our main result shows that under suitable well-formedness conditions for swarm protocols consistency is eventually recovered and the locally observable behaviour of conforming machines will eventually match the global specification. Our model elaborates on the Actyx industrial platform and provides the basis for tool support: we sketch an implemented prototype which proves this work a viable step towards reasoning about local-first and peer-to-peer software systems.
Cite as

Roland Kuhn, Hernán Melgratti, and Emilio Tuosto. Behavioural Types for Local-First Software. In 37th European Conference on Object-Oriented Programming (ECOOP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 263, pp. 15:1-15:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{kuhn_et_al:LIPIcs.ECOOP.2023.15,
  author =	{Kuhn, Roland and Melgratti, Hern\'{a}n and Tuosto, Emilio},
  title =	{{Behavioural Types for Local-First Software}},
  booktitle =	{37th European Conference on Object-Oriented Programming (ECOOP 2023)},
  pages =	{15:1--15:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-281-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{263},
  editor =	{Ali, Karim and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2023.15},
  URN =		{urn:nbn:de:0030-drops-182086},
  doi =		{10.4230/LIPIcs.ECOOP.2023.15},
  annote =	{Keywords: Distributed coordination, local-first software, behavioural types, publish-subscribe, asynchronous communication}
}
Document
Artifact
DOI: 10.4230/DARTS.9.2.14
Behavioural Types for Local-First Software (Artifact)

Authors: Roland Kuhn, Hernán Melgratti, and Emilio Tuosto

Published in: DARTS, Volume 9, Issue 2, Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
This artifact supports the theory of swarm protocols presented in the related article. Specifically, following the top-down development typical of choreographic approaches, our artifact enables the specification of systems of peers communicating through an event notification mechanism from a global viewpoint which can then be projected to local specifications of peers, rendered as machines. To the best of our knowledge, ours is the first implementation of a behavioural type framework supporting the application of the principles of local-first software for network devices which collaborate on a common task while retaining full autonomy. The artifact can be integrated in the Actyx industrial platform; this proves this work a viable step towards reasoning about local-first and peer-to-peer software systems.
Cite as

Roland Kuhn, Hernán Melgratti, and Emilio Tuosto. Behavioural Types for Local-First Software (Artifact). In Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023). Dagstuhl Artifacts Series (DARTS), Volume 9, Issue 2, pp. 14:1-14:5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@Article{kuhn_et_al:DARTS.9.2.14,
  author =	{Kuhn, Roland and Melgratti, Hern\'{a}n and Tuosto, Emilio},
  title =	{{Behavioural Types for Local-First Software (Artifact)}},
  pages =	{14:1--14:5},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2023},
  volume =	{9},
  number =	{2},
  editor =	{Kuhn, Roland and Melgratti, Hern\'{a}n and Tuosto, Emilio},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DARTS.9.2.14},
  URN =		{urn:nbn:de:0030-drops-182541},
  doi =		{10.4230/DARTS.9.2.14},
  annote =	{Keywords: Distributed coordination, local-first software, behavioural types, publish-subscribe, asynchronous communication}
}
Document
DOI: 10.4230/LIPIcs.CONCUR.2020.14
Probabilistic Analysis of Binary Sessions

Authors: Omar Inverso, Hernán Melgratti, Luca Padovani, Catia Trubiani, and Emilio Tuosto

Published in: LIPIcs, Volume 171, 31st International Conference on Concurrency Theory (CONCUR 2020)

Abstract
We study a probabilistic variant of binary session types that relate to a class of Finite-State Markov Chains. The probability annotations in session types enable the reasoning on the probability that a session terminates successfully, for some user-definable notion of successful termination. We develop a type system for a simple session calculus featuring probabilistic choices and show that the success probability of well-typed processes agrees with that of the sessions they use. To this aim, the type system needs to track the propagation of probabilistic choices across different sessions.
Cite as

Omar Inverso, Hernán Melgratti, Luca Padovani, Catia Trubiani, and Emilio Tuosto. Probabilistic Analysis of Binary Sessions. In 31st International Conference on Concurrency Theory (CONCUR 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 171, pp. 14:1-14:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{inverso_et_al:LIPIcs.CONCUR.2020.14,
  author =	{Inverso, Omar and Melgratti, Hern\'{a}n and Padovani, Luca and Trubiani, Catia and Tuosto, Emilio},
  title =	{{Probabilistic Analysis of Binary Sessions}},
  booktitle =	{31st International Conference on Concurrency Theory (CONCUR 2020)},
  pages =	{14:1--14:21},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-160-3},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{171},
  editor =	{Konnov, Igor and Kov\'{a}cs, Laura},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2020.14},
  URN =		{urn:nbn:de:0030-drops-128264},
  doi =		{10.4230/LIPIcs.CONCUR.2020.14},
  annote =	{Keywords: Probabilistic choices, session types, static analysis, deadlock freedom}
}
Document
DOI: 10.4230/LIPIcs.FSTTCS.2019.42
A Categorical Account of Replicated Data Types

Authors: Fabio Gadducci, Hernán Melgratti, Christian Roldán, and Matteo Sammartino

Published in: LIPIcs, Volume 150, 39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019)

Abstract
Replicated Data Types (RDTs) have been introduced as a suitable abstraction for dealing with weakly consistent data stores, which may (temporarily) expose multiple, inconsistent views of their state. In the literature, RDTs are commonly specified in terms of two relations: visibility, which accounts for the different views that a store may have, and arbitration, which states the logical order imposed on the operations executed over the store. Different flavours, e.g., operational, axiomatic and functional, have recently been proposed for the specification of RDTs. In this work, we propose an algebraic characterisation of RDT specifications. We define categories of visibility relations and arbitrations, show the existence of relevant limits and colimits, and characterize RDT specifications as functors between such categories that preserve these additional structures.
Cite as

Fabio Gadducci, Hernán Melgratti, Christian Roldán, and Matteo Sammartino. A Categorical Account of Replicated Data Types. In 39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 150, pp. 42:1-42:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{gadducci_et_al:LIPIcs.FSTTCS.2019.42,
  author =	{Gadducci, Fabio and Melgratti, Hern\'{a}n and Rold\'{a}n, Christian and Sammartino, Matteo},
  title =	{{A Categorical Account of Replicated Data Types}},
  booktitle =	{39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019)},
  pages =	{42:1--42:15},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-131-3},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{150},
  editor =	{Chattopadhyay, Arkadev and Gastin, Paul},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2019.42},
  URN =		{urn:nbn:de:0030-drops-116042},
  doi =		{10.4230/LIPIcs.FSTTCS.2019.42},
  annote =	{Keywords: Replicated data type, Specification, Functorial characterisation}
}
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