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Disciplined Structured Communications with Disciplined Runtime Adaptation

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 requirements related to runtime adaptation. 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 framework of adaptable processes, in which concurrent processes can be replaced, suspended, or discarded at runtime. In this paper, we propose a session type discipline for a calculus with adaptable processes. Our typed framework offers a simple alternative for integrating runtime adaptation mechanisms in the modeling and analysis of structured communications. We show that well-typed processes enjoy safety and consistency properties: while the former property ensures the absence of communication errors at runtime, the latter guarantees that active session behavior is never disrupted by adaptation actions.

Journal: Science of Computer Programming ( United Kingdom )

Volume: 97

Pages: 235 to 265

Date: January, 2015

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