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Tuple-Based Coordination in Large-Scale Situated Systems

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Coordination Models and Languages (COORDINATION 2021)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 12717))

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Abstract

Space and time are key elements for many computer-based systems and often elevated to first-class abstractions. In tuple-based coordination, Linda primitives have been independently extended with space (with tuples and queries spanning spatial regions) or time information (mostly for tuple scoping). However, recent works in collective adaptive systems and aggregate computing show that space and time can naturally be considered as two intertwined facets of a common coordination abstraction for situated distributed systems. Accordingly, we introduce the Spatiotemporal Tuples model, a natural adaptation of Linda model for physically deployed large-scale networks. Unlike prior research, spatiotemporal properties – expressing where and when a tuple should range and has to be deposited/retrieved – naturally turn into specifications of collective adaptive processes, to be carried on in cooperation by the devices filling the computational environment, and sustaining tuple operations in a resilient way, possibly even in mobile and faulty environments. Additionally, the model promotes decentralised implementations where tuples actually reside where they are issued, which is good for supporting peer-to-peer and mobile ad-hoc networks as well as privacy. In this paper, we (i) present and formalise the Spatiotemporal Tuples model, based on the unifying notion of computational space-time structure, (ii) provide an implementation in the ScaFi aggregate computing framework, turning tuple operations into aggregate processes, and finally (iii) provide evaluation through simulation and a rescue case study.

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Notes

  1. 1.

    This work extends the workshop paper in [17] with formalisation, full implementation, and evaluation.

  2. 2.

    We do not give an explicit syntax for spatio-temporal regions, in order to cover applications with any such syntax. Definable corresponds to space-time computable [2], thus requiring the existence of a computational procedure deciding whether the predicate \(\mathtt {r}(\epsilon , \epsilon ')\) holds in some event \(\epsilon '\) using only information in the past of \(\epsilon '\).

  3. 3.

    https://github.com/metaphori/experiment-2021-spatiotemporaltuples.

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Authors and Affiliations

  1. Alma Mater Studiorum–Università di Bologna, Cesena, Italy

    Roberto Casadei, Mirko Viroli & Alessandro Ricci

  2. Università di Torino, Turin, Italy

    Giorgio Audrito

Authors
  1. Roberto Casadei
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  2. Mirko Viroli
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  3. Alessandro Ricci
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  4. Giorgio Audrito
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Correspondence to Roberto Casadei .

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Editors and Affiliations

  1. University of Turin, Turin, Italy

    Ferruccio Damiani

  2. Sir Alwyn William Building, University of Glasgow, Glasgow, UK

    Ornela Dardha

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Casadei, R., Viroli, M., Ricci, A., Audrito, G. (2021). Tuple-Based Coordination in Large-Scale Situated Systems. In: Damiani, F., Dardha, O. (eds) Coordination Models and Languages. COORDINATION 2021. Lecture Notes in Computer Science(), vol 12717. Springer, Cham. https://doi.org/10.1007/978-3-030-78142-2_10

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  • DOI: https://doi.org/10.1007/978-3-030-78142-2_10

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