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Locally Static, Globally Dynamic Session Types for Active Objects

Authors Reiner Hähnle , Anton W. Haubner, Eduard Kamburjan

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Author Details

Reiner Hähnle
  • Technical University Darmstadt, Germany
Anton W. Haubner
  • Technical University Darmstadt, Germany
Eduard Kamburjan
  • Technical University Darmstadt, Germany

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Reiner Hähnle, Anton W. Haubner, and Eduard Kamburjan. Locally Static, Globally Dynamic Session Types for Active Objects. In Recent Developments in the Design and Implementation of Programming Languages. Open Access Series in Informatics (OASIcs), Volume 86, pp. 1:1-1:24, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)


Active object languages offer an attractive trade-off between low-level, preemptive concurrency and fully distributed actors: syntactically identifiable atomic code segments and asynchronous calls are the basis of cooperative concurrency, still permitting interleaving, but nevertheless being mechanically analyzable. The challenge is to reconcile local static analysis of atomic segments with the global scheduling constraints it depends on. Here, we propose an approximate, hybrid approach; At compile-time we perform a local static analysis: later, any run not complying to a global specification is excluded via runtime checks. That specification is expressed in a type-theoretic language inspired by session types. The approach reverses the usual (first global, then local) order of analysis and, thereby, supports analysis of open distributed systems.

Subject Classification

ACM Subject Classification
  • Theory of computation → Distributed computing models
  • Theory of computation → Object oriented constructs
  • Theory of computation → Type structures
  • Session Types
  • Active Objects
  • Runtime Verification
  • Static Verification


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