A design-by-contract approach to recover the architectural style from run-time misbehaviour

摘要

We propose to control the reconfigurations of applications leading to an erroneous state by exploiting its architectural model. Our work relies on Architectural Design Rewriting (ADR, for short) which is a rule-based formal framework for modelling (the evolution of) software architectures. We equip the reconfiguration rules of an ADR architecture with pre- and post-conditions expressed in a simple logic; a pre-condition constraints the applicability of a rule while a post-condition specifies the properties expected of the resulting graphs. We give an algorithm to compute the weakest pre-condition out of a rule and its postcondition. On top of this algorithm, we design a simple methodology that allows us to select which rules can be applied at the architectural level to reconfigure a system so to regain its architectural style when it becomes compromised by unexpected run-time reconfigurations.