QoS negotiation in service composition

10 years 6 months ago
QoS negotiation in service composition
Service composition in Service Oriented Computing concerns not only integration of heterogeneous distributed applications but also dynamic selection of services. Quality of Service (QoS) plays a key role in service composition as services providing the same functionalities can be differentiated according to their QoS guarantees. At subscription time, a service requester and a provider may sign a contract recording the QoS of the supplied service. The cc-pi calculus has been introduced as a constraint-based model of QoS contracts. In this work we propose a variant of the cc-pi calculus in which the alternatives in a choice rather than being selected nondeterministically have a dynamic priority. Basically, a guard cj : πj in a choice is enabled if the constraint cj is entailed by the store of constraints and the prefix πj can be consumed. Moreover, the j-th branch can be selected not only if the corresponding guard cj : πj is enabled but also if cj is weaker than the constraints ci...
Maria Grazia Buscemi, Ugo Montanari
Added 14 May 2011
Updated 14 May 2011
Type Journal
Year 2011
Where JLP
Authors Maria Grazia Buscemi, Ugo Montanari
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