Bounded Retransmission in Event-B||CSP: a Case Study

Authors:
Steve Schneider;Helen Treharne;Heike Wehrheim
Affiliations:
Department of Computing, University of Surrey, Guildford, Surrey, UK;Department of Computing, University of Surrey, Guildford, Surrey, UK;Institut für Informatik, Universität Paderborn, Paderborn, Germany
Venue:
Electronic Notes in Theoretical Computer Science (ENTCS)
Year:
2011

Citing 6
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Abstract

Event-B@?CSP is a combination of Event-B and CSP in which CSP controllers are used in conjunction with Event-B machines to allow a more explicit approach to control flow. Recent results have provided an approach to stepwise refinement of such combinations. This paper presents a simplified Bounded Retransmission Protocol case study, inspired by Abrial@?s treatment of this example, to illustrate several aspects new in the approach. The case study includes refinement steps to illustrate four different aspects of this approach to refinement: (1) splitting events; (2) introducing convergent looping behaviour; (3) the relationship between anticipated, convergent, and devolved events; and (4) converging anticipated events.