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Abstract
We present CO2, a parametric calculus for contract-based computing in distributed systems. By abstracting from the actual contract language, our calculus generalises both the contracts-as-processes and contracts-as-formulae paradigms. The calculus features primitives for advertising contracts, for reaching agreements, and for querying the fulfilment of contracts. Coordination among participants happens via multi-party sessions, which are created once agreements are reached. We present two instances of our calculus, by modelling contracts as processes in a variant of CCS, and as formulae in a logic. We formally relate the two paradigms, through an encoding from contracts-as-formulae to contracts-as-processes which ensures that the promises deducible in the logical system are exactly those reachable by its encoding as a process. Finally, we present a coarse-grained taxonomy of possible misbehaviours in contract-oriented systems, and we illustrate them with the help of a variety of examples.
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Cite it as
@article{bartoletti2012contractoriented,
title = {Contract-Oriented Computing in CO2},
author = {Massimo Bartoletti and Emilio Tuosto and Roberto Zunino},
year = {2012},
journal = {Scientific Annals of Computer Science},
volume = {22},
number = {1},
pages = {5--60},
doi = {10.7561/sacs.2012.1.5},
}