CLAN: A Tool for Contract Analysis and Conflict Discovery

Authors:
Stephen Fenech;Gordon J. Pace;Gerardo Schneider
Affiliations:
Dept. of Computer Science, University of Malta, Malta;Dept. of Computer Science, University of Malta, Malta;Dept. of Informatics, University of Oslo, Norway
Venue:
ATVA '09 Proceedings of the 7th International Symposium on Automated Technology for Verification and Analysis
Year:
2009

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Abstract

As Service-Oriented Architectures are more widely adopted, it becomes more important to adopt measures for ensuring that the services satisfy functional and non-functional requirements. One approach is the use of contracts based on deontic logics, expressing obligations, permissions and prohibitions of the different actors. A challenging aspect is that of service composition, in which the contracts composed together may result in conflicting situations, so there is a need to analyse contracts and ensure their soundness. In this paper, we present CLAN, a tool for automatic analysis of conflicting clauses of contracts written in the contract language ${\mathcal CL}$. We present a small case study of an airline check-in desk illustrating the use of the tool.