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Designing a Nonmonotonic Soft Concurrent Constraint Language for SLA Management (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali)

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Designing a Nonmonotonic Soft Concurrent Constraint Language for SLA Management (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali) (literal)

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S. Bistarelli, F. Santini (2007)
Designing a Nonmonotonic Soft Concurrent Constraint Language for SLA Management
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We present an extension of the Soft Concurrent Constraint language to allow the nonmonotonic evolution of the constraint store. To accomplish this, we introduce some new operations: the retract(c) reduces the current store by c, the updateX(c) transactionally relaxes all the constraints of the store that deal with the variables in X set, and then adds a constraint c (usually with support = X); the nask(c) tests if c is not entailed by the store.We present this framework as a possible solution to the management of resources (e.g. web services and network resource allocation) that need a given Quality of Service (QoS). The QoS requirements of all the parties should converge, through a negotiation process, on a formal agreement defined as the Service Level Agreement, which specifies the contract that must be enforced. The main advantage is to have a preference (or cost) measure directly embedded in the language, and to have a highly flexible and parametric abstraction. (literal)

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