Monotonicity in Service Orchestrations

Anne Bouillard 1, 2 Sidney Rosario 2 Albert Benveniste 2 Stefan Haar 3
1 LIENS - Laboratoire d'informatique de l'école normale supérieure
2 DISTRIBCOM - Distributed and Iterative Algorithms for the Management of Telecommunications Systems
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
3 MEXICO - Modeling and Exploitation of Interaction and Concurrency
LSV - Laboratoire Spécification et Vérification [Cachan], ENS Cachan - École normale supérieure - Cachan, Inria Saclay - Ile de France, CNRS - Centre National de la Recherche Scientifique : UMR8643
Abstract : Web Service orchestrations are compositions of different Web Services to form a new service. The services called during the orchestration guarantee a given performance to the orchestrater, usually in the form of contracts. These contracts can be used by the orchestrater to deduce the contract it can offer to its own clients, by performing contract composition. An implicit assumption in contract based QoS management is: "the better the component services perform, the better the orchestration's performance will be". Thus, contract based QoS management for Web services orchestrations implicitly assumes monotony. In some orchestrations, however, monotony can be violated, i.e., the performance of the orchestration improves when the performance of a component service degrades. This is highly undesirable since it can render the process of contract composition inconsistent. In this paper we define monotony for orchestrations modelled by Colored Occurrence Nets (CO-nets) and we characterize the classes of monotonic orchestrations. We show that few orchestrations are indeed monotonic, mostly since latency can be traded for quality of data. We also propose a sound refinement of monotony, called conditional monotony, which forbids this kind of cheating and show that conditional monotony is widely satisfied by orchestrations. This finding leads to reconsidering the way SLAs should be formulated.
Type de document :
Communication dans un congrès
Franceschinis, Giuliana and Wolf, Karsten. Proceedings of the 30th International Conference on Applications and Theory of Petri Nets (ICATPN'09), 2009, Paris, France, France. Springer, 5606, pp.263-282, 2009, 〈10.1007/978-3-642-02424-5_16〉
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Contributeur : Stefan Haar <>
Soumis le : vendredi 4 novembre 2011 - 14:52:30
Dernière modification le : mardi 24 avril 2018 - 17:20:10

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Anne Bouillard, Sidney Rosario, Albert Benveniste, Stefan Haar. Monotonicity in Service Orchestrations. Franceschinis, Giuliana and Wolf, Karsten. Proceedings of the 30th International Conference on Applications and Theory of Petri Nets (ICATPN'09), 2009, Paris, France, France. Springer, 5606, pp.263-282, 2009, 〈10.1007/978-3-642-02424-5_16〉. 〈inria-00638289〉

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