Istituto di Informatica e Telematica     
Bistarelli S., Santini F. A Nonmonotonic Soft Concurrent Constraint Language for SLA Negotiation. In: CILC08 - 23-esimo Convegno Italiano di Logica Computazionale (2008). Proceedings, pp. 147 - 162. Elsevier, 2008.
We present an extension of the Soft Concurrent Constraint language that allows 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 the set X, and then adds a constraint c; 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. c-semirings are the algebraic structures that we use to model QoS metrics.
Subject Soft Constraint Logic Programming
Quality of Service
Service Level Agreement
D.4.6 Security and Protection

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