Alice or Bob?: Process polymorphism in choreographies

Eva Graversen, Andrew K. Hirsch, Fabrizio Montesi [2024].
In J. Funct. Program. 34.

Abstract

We present PolyChor

$\lambda$

, a language for higher-order functional choreographic programming—an emerging paradigm for concurrent programming. In choreographic programming, programmers write the desired cooperative behaviour of a system of processes and then compile it into an implementation for each process, a translation called endpoint projection. Unlike its predecessor, Chor

$\lambda$

, PolyChor

$\lambda$

has both type and process polymorphism inspired by System F

$_\omega$

. That is, PolyChor

$\lambda$

is the first (higher-order) functional choreographic language which gives programmers the ability to write generic choreographies and determine the participants at runtime. This novel combination of features also allows PolyChor

$\lambda$

processes to communicate distributed values, leading to a new and intuitive way to write delegation. While some of the functional features of PolyChor

$\lambda$

give it a weaker correspondence between the semantics of choreographies and their endpoint-projected concurrent systems than some other choreographic languages, we still get the hallmark end result of choreographic programming: projected programmes are deadlock-free by design.

Links

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Additional notes

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Cite (BibTeX)

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@article{DBLP:journals/jfp/GraversenHM24,
  author       = {Eva Graversen and
                  Andrew K. Hirsch and
                  Fabrizio Montesi},
  title        = {Alice or Bob?: Process polymorphism in choreographies},
  journal      = {J. Funct. Program.},
  volume       = {34},
  year         = {2024},
  url          = {https://doi.org/10.1017/s0956796823000114},
  doi          = {10.1017/S0956796823000114},
  timestamp    = {Mon, 01 Apr 2024 11:15:35 +0200},
  biburl       = {https://dblp.org/rec/journals/jfp/GraversenHM24.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}

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