Modelling Coordinated Atomic Actions in Timed CSP
FTRTFT '00 Proceedings of the 6th International Symposium on Formal Techniques in Real-Time and Fault-Tolerant Systems
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This paper presents a scheme for co-ordinated error recovery between multiple interacting objects in a concurrent object-oriented system. A conceptual framework for fault tolerance is established based on a general object concurrency model that is supported by most concurrent object-oriented languages and systems. This framework integrates two complementary concepts - conversations and transactions. Conversations (associated with co-operative exception handling) are used to provide co-ordinated error recovery between concurrent interacting activities whilst transactions are used to maintain the consistency of shared resources in the presence of concurrent access. The serialisability property of transactions is exploited in order to help prevent unexpected information smuggling. The proposed framework is illustrated by means of a case study, and various linguistic and implementation issues are discussed.