Session contracts is a formalism enabling to investigate client/server interaction protocols and to interpret session types. We extend session contracts in order to represent outputs whose actual sending in an interaction depends on a third party or on a mutual agreement between the partners. Such contracts are hence adaptable, or as we say “affectible”. In client/server systems, in general, compliance stands for the satisfaction of all client's requests by the server. We define an abstract notion of “affectible compliance” and show it to have a precise three-party game-theoretic interpretation. This in turn is shown to be equivalent to a compliance based on interactions that can undergo a sequence of failures and rollbacks, as well as to a compliance based on interactions which can be mediated by an orchestrator. Besides, there is a one-to-one effective correspondence between winning strategies and orchestrators. The relation of subcontract for affectible contracts is also investigated.

Retractability, games and orchestrators for session contracts

De' Liguoro U.
2017-01-01

Abstract

Session contracts is a formalism enabling to investigate client/server interaction protocols and to interpret session types. We extend session contracts in order to represent outputs whose actual sending in an interaction depends on a third party or on a mutual agreement between the partners. Such contracts are hence adaptable, or as we say “affectible”. In client/server systems, in general, compliance stands for the satisfaction of all client's requests by the server. We define an abstract notion of “affectible compliance” and show it to have a precise three-party game-theoretic interpretation. This in turn is shown to be equivalent to a compliance based on interactions that can undergo a sequence of failures and rollbacks, as well as to a compliance based on interactions which can be mediated by an orchestrator. Besides, there is a one-to-one effective correspondence between winning strategies and orchestrators. The relation of subcontract for affectible contracts is also investigated.
2017
13
3
1
51
Concurrent game; Contract; Orchestrator; Retractability; Session contract; Strategy
Barbanera F.; De' Liguoro U.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1763682
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