Centralized and distributed orchestration of transactions in the join calculus

We discuss the principles of distributed transactions, then we define an operational model which meets the basic requirements and we give a prototyping implementation for it in join-calculus. Our model: (1) extends BizTalk with multiway transactions; (2) exploits an original algorithm, for distributed commit; (3) can deal with dynamically changing communication topology; (4) is almost language-independent. In fact, the model is based on a two-level classification of resources, which should be easily conveyed to distributed calculi and languages, providing them with a uniform transactional mechanism.