A Formal Approach for Cloud Composite Services Verification

With the emergence of the Cloud computing paradigm, service composition has received much interests as it satisfies complex user requirements. Service composition promote reuse, interoperability, and loosely coupled interaction. However, verifying the correctness of a composition remains a tedious task. To ensure the correctness of a composite service, critical properties such interoperability, reachability, liveness and persistence must be verified. In this paper, we propose a novel formal approach to verify Cloud composite services based on the Event-B method. Event-B provides rigorous mathematical reasoning that helps building trust on developed software. To check the soundness of the proposed model, a verification and validation approach combining both mathematical proofs and model checking is performed.