Consistent Reconfiguration for Publish/Subscribe Architecture Styles

This paper addresses the dynamic aspect of Publish/Subscribe architectures. We propose an integrated formal approach for the specification and verification of reconfigurations over the topology of Publish/Subscribe architecture styles. We integrate a functional approach and a structural approach based on graph grammars. The purpose is to express dynamism while offering a simple specification which can be easy to read and to understand. We use the specification language Z to describe the constraints made on the architecture style and we describe the dynamic of architecture via guarded graph-rewriting rules whose guards mainly describe the pre- and post-conditions ensuring in this way the preservation of stylistic constraints. To ensure that the system is evolving correctly, we elaborate a verification process which validates each rule, whose semantic is described in Z notation, using the ZEVES theorem prover.