A smooth orchestrator is a process with several alternative branches, every one defining synchronizations among co-located channels. Smooth orchestrators constitute a basic mechanism that may express standard workflow patterns in Web services as well as common synchronization constructs in programming languages. Smooth orchestrators may be created in one location and migrated to a different one, still not manifesting problems that usually afflict generic mobile agents.
We encode an extension of Milner’s (asynchronous) pi calculus with join patterns into a calculus of smooth orchestrators and we yield a strong correctness result (full abstraction) when the subjects of the join patterns are co-located. We also study the translation of smooth orchestrators into finite-state automata, therefore addressing the implementation of co-location constraints and the case when synchronizations are not linear with respect to subjects.
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