Dagstuhl Seminar Proceedings, Volume 5081

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05081 Abstracts Collection – Foundations of Global Computing

Authors: José Luiz Fiadeiro, Ugo Montanari, and Martin Wirsing

Abstract

From 20.02.05 to 25.02.05, the Dagstuhl Seminar 05081 on ``Foundations of Global Computing'' was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.

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José Luiz Fiadeiro, Ugo Montanari, and Martin Wirsing. 05081 Abstracts Collection – Foundations of Global Computing. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{fiadeiro_et_al:DagSemProc.05081.1,
  author =	{Fiadeiro, Jos\'{e} Luiz and Montanari, Ugo and Wirsing, Martin},
  title =	{{05081 Abstracts Collection – Foundations of Global Computing}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--16},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.1},
  URN =		{urn:nbn:de:0030-drops-4590},
  doi =		{10.4230/DagSemProc.05081.1},
  annote =	{Keywords: Global Computing}
}

Document

DOI: 10.4230/DagSemProc.05081.2

Architectural Views for CommUnity

Authors: Cristóvão Oliveira and Michel Wermelinger

Abstract

CommUnity and its categorical foundations provide a formal approach to Software Architecture (SA). Several concepts such as (re) configuration and (higher-order) connector have been given precise definitions in this setting. One of the cornerstones of the approach is the separation between computation, coordination and distribution. In this paper, we take this separation one step further and define explicit architectural views, one for each concern. They will be used to help to detect errors made while building the architecture. Moreover they will be a support to improve the design of the system by focusing on one concern at a time and/or by combining them with each other.

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Cristóvão Oliveira and Michel Wermelinger. Architectural Views for CommUnity. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{oliveira_et_al:DagSemProc.05081.2,
  author =	{Oliveira, Crist\'{o}v\~{a}o and Wermelinger, Michel},
  title =	{{Architectural Views for CommUnity}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--3},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.2},
  URN =		{urn:nbn:de:0030-drops-2967},
  doi =		{10.4230/DagSemProc.05081.2},
  annote =	{Keywords: Software Architecture, views, computation, coordination, distribution}
}

Document

DOI: 10.4230/DagSemProc.05081.3

Data Handover: Reconciling Message Passing and Shared Memory

Authors: Jens Gustedt

Abstract

Data Handover (DHO) is a programming paradigm and interface that aims to handle data between parallel or distributed processes that mixes aspects of message passing and shared memory. It is designed to overcome the potential problems in terms of efficiency of both: (1) memory blowup and forced copies for message passing and (2) data consistency and latency problems for shared memory. Our approach attempts to be simple and easy to understand. It contents itself with just a handful of functions to cover the main aspects of coarse grained inter-operation upon data.

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Jens Gustedt. Data Handover: Reconciling Message Passing and Shared Memory. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{gustedt:DagSemProc.05081.3,
  author =	{Gustedt, Jens},
  title =	{{Data Handover: Reconciling Message Passing and Shared Memory}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--13},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.3},
  URN =		{urn:nbn:de:0030-drops-2977},
  doi =		{10.4230/DagSemProc.05081.3},
  annote =	{Keywords: Efficient data management, message passing, shared memory}
}

Document

DOI: 10.4230/DagSemProc.05081.4

Injecting Distribution in CASL

Authors: Maura Cerioli and Matteo Dell'Amico

Abstract

We present a first attempt at the development of a library in the specification language Casl providing primitives to represent connectivity and communication in a distributed system. The focus, in particular, is on peer-to-peer, which presents more challanges than the client-server paradigm, because of the higher degree of anarchy and the large amount of middleware providing similar but different features in support of it. From our experience on the definition of this library, we draw some methodological lessons on how to deal with the capture of complex software systems, as opposite to classical libraries representing standard or mathematical datatypes.

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Maura Cerioli and Matteo Dell'Amico. Injecting Distribution in CASL. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{cerioli_et_al:DagSemProc.05081.4,
  author =	{Cerioli, Maura and Dell'Amico, Matteo},
  title =	{{Injecting Distribution in CASL}},
  booktitle =	{Foundations of Global Computing},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.4},
  URN =		{urn:nbn:de:0030-drops-2981},
  doi =		{10.4230/DagSemProc.05081.4},
  annote =	{Keywords: P2P, CASL, algebraic specification language, specification library}
}

Document

DOI: 10.4230/DagSemProc.05081.5

Insights emerged while comparing three models for global computing

Authors: Ivan Lanese and Ugo Montanari

Abstract

In this paper we outline the main ideas emerged while studying a chain of mappings from emph{Fusion Calculus} to emph{logic programming}, using emph{Synchronized Hyperedge Replacement} (with both Hoare and Milner synchronizations) as intermediate step. We aim more at discussing the ideas behind the mappings than at presenting their technical details.

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Ivan Lanese and Ugo Montanari. Insights emerged while comparing three models for global computing. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{lanese_et_al:DagSemProc.05081.5,
  author =	{Lanese, Ivan and Montanari, Ugo},
  title =	{{Insights emerged while comparing three models for global computing}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--20},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.5},
  URN =		{urn:nbn:de:0030-drops-2955},
  doi =		{10.4230/DagSemProc.05081.5},
  annote =	{Keywords: Fusion Calculus, graph transformation, synchronized hyperedge replacement, logic programming, mobility}
}

Document

DOI: 10.4230/DagSemProc.05081.6

MiKO---Mikado Koncurrent Objects

Authors: Francisco Martins, Liliana Salvador, Vasco T. Vasconcelos, and Luís Lopes

Abstract

The motivation for the Mikado migration model is to provide programming constructs for controlling code mobility that are as independent as possible from the particular programming language used to program the code. The main idea is to regard a domain (or site, or locality), where mobile code may enter or exit, as a membrane enclosing running processes, and offering services that have to be called for entering or exiting the domain. MiKO---Mikado Koncurrent Objects is a particular instance of this model, where the membrane is explicitly split in two parts: the methods defining the interface, and a process part describing the data for, and the behavior of, the interface. The talk presents the syntax, operational semantics, and type system of MiKO, together with an example. It concludes by briefly mentioning the implementation of a language based on the calculus.

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Francisco Martins, Liliana Salvador, Vasco T. Vasconcelos, and Luís Lopes. MiKO---Mikado Koncurrent Objects. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-43, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{martins_et_al:DagSemProc.05081.6,
  author =	{Martins, Francisco and Salvador, Liliana and Vasconcelos, Vasco T. and Lopes, Lu{\'\i}s},
  title =	{{MiKO---Mikado Koncurrent Objects}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--43},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.6},
  URN =		{urn:nbn:de:0030-drops-3014},
  doi =		{10.4230/DagSemProc.05081.6},
  annote =	{Keywords: Global computing, code migration, administrative domains, process calculus}
}

Document

DOI: 10.4230/DagSemProc.05081.7

Practical Techniques for Language Design and Prototyping

Authors: Mark-Oliver Stehr and Carolyn Talcott L.

Abstract

Global computing involves the interplay of a vast variety of languages, but practially useful foundations for language specification and prototyping at the semantic level are lacking. In this talk we present a systematic approach consisting of three techniques: 1. A generic calculus of explicit substitutions with names (called CINNI) that allows us give a first-order representation of syntax to uniformly deal with all binding aspects. 2. An executable representation of Felleisen-style operational semantics in terms of first-order rewrite rules. 3. A logical framework, namely rewriting logic, that allows us to express (1) and (2) and, in addition, language aspects such as concurrency and non-determinism. We illustrate the use of these techniques in two applications: 1. A formal specification and analysis of PLAN, a Packet Language for Active Networks, that has been developed in the Switchware project at UPenn. This work was conducted in the scope of the DARPA Active Network Program. 2. The development of CIAO, a Calculus of Imperative Active Objects, a core language for concurrent object-oriented programming. It is especially designed to allow a the representation of practically relevant sublanguages of common object-oriented languages such as Java, C#, and C++. This second application is subject of ongoing work.

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Mark-Oliver Stehr and Carolyn Talcott L.. Practical Techniques for Language Design and Prototyping. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-38, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{stehr_et_al:DagSemProc.05081.7,
  author =	{Stehr, Mark-Oliver and Talcott L., Carolyn},
  title =	{{Practical Techniques for Language Design and Prototyping}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--38},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.7},
  URN =		{urn:nbn:de:0030-drops-3006},
  doi =		{10.4230/DagSemProc.05081.7},
  annote =	{Keywords: Rewriting logic, explicit substitutions, operational semantics, active networks, active objects}
}

Document

DOI: 10.4230/DagSemProc.05081.8

Probabilistic Anonymity

Authors: Catuscia Palamidessi and Mohit Bhargava

Abstract

The concept of anonymity comes into play in a wide range of situations, varying from voting and anonymous donations to postings on bulletin boards and sending mails. A formal definition of this concept has been given in literature in terms of nondeterminism. In this paper, we investigate a notion of anonymity based on probability theory, and we we discuss the relation with the nondeterministic one. We then formulate this definition in terms of observables for processes in the probabilistic $pi$-calculus, and propose a method to verify automatically the anonymity property. We illustrate the method by using the example of the dining cryptographers.

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Catuscia Palamidessi and Mohit Bhargava. Probabilistic Anonymity. In Foundations of Global Computing. Dagstuhl Seminar Proceedings, Volume 5081, pp. 1-25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{palamidessi_et_al:DagSemProc.05081.8,
  author =	{Palamidessi, Catuscia and Bhargava, Mohit},
  title =	{{Probabilistic Anonymity}},
  booktitle =	{Foundations of Global Computing},
  pages =	{1--25},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5081},
  editor =	{Jos\'{e} Luiz Fiadeiro and Ugo Montanari and Martin Wirsing},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05081.8},
  URN =		{urn:nbn:de:0030-drops-2992},
  doi =		{10.4230/DagSemProc.05081.8},
  annote =	{Keywords: Anonymity, probability theory, process calculi}
}

Dagstuhl Seminar Proceedings, Volume 5081

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05081 Abstracts Collection – Foundations of Global Computing

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Architectural Views for CommUnity

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Data Handover: Reconciling Message Passing and Shared Memory

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Injecting Distribution in CASL

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Insights emerged while comparing three models for global computing

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MiKO---Mikado Koncurrent Objects

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Practical Techniques for Language Design and Prototyping

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Probabilistic Anonymity

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