Data-Driven Choreographies à la Klaim

We propose Klaim as a suitable base for a novel choreographic framework. More precisely we advocate Klaim as a suitable language onto which to project data-driven global specifications based on distributed tuple spaces. These specifications, akin to behavioural types, describe the coordination from a global point of view. Differently from behavioural types though, our specifications express the data flow across distributed tuple spaces rather than detailing the communication pattern of processes. We devise a typing system to validate Klaim programs against projections of our global specifications. An interesting feature of our typing approach is that well-typed systems have an arbitrary number of participants. In standard approaches based on behavioural types, this is often achieved at the cost of considerable technical complications.