Disciplined Structured Communications with Safe Runtime Adaptation

C. Di Giusto and J.A. Pèrez
In SAC 2013, ACM, pages 1913-1918, 2013.
Session types offer a powerful type-theoretic foundation for the analysis of structured communications, as commonly found in service-oriented systems. They are defined upon core programming calculi which offer only limited support for expressing adaptation and evolvability requirements. This is unfortunate, as service-oriented systems are increasingly being deployed upon highly dynamic infrastructures in which such requirements are central concerns. In previous work, we developed a process calculi frame- work of adaptable processes, in which concurrent processes can be replaced, suspended, or discarded at runtime. In this paper, we propose a session types discipline for a calculus with adaptable processes. Our framework offers an alternative for integrating runtime adaptation mechanisms in the analysis of structured communications. We show that well-typed processes enjoy consistency: communicating behavior is never interrupted by evolvability actions.