CC-Pi: A Constraint-Based Language for Specifying Service Level Agreements

Abstract. Service Level Agreements are a key issue in Service Oriented Computing. SLA contracts specify client requirements and service guarantees, with emphasis on Quality of Service (cost, performance, availability, etc.). In this work we propose a simple model of contracts for QoS and SLAs that also allows to study mechanisms for resource allocation and for joining different SLA requirements. Our language combines two basic programming paradigms: name-passing calculi and concurrent constraint programming (cc programming). Specifically, we extend cc programming by adding synchronous communication and by providing a treatment of names in terms of restriction and structural axioms closer to nominal calculi than to variables with existential quantification. In the resulting framework, SLA requirements are constraints that can be generated either by a single party or by the synchronisation of two agents. Moreover, restricting the scope of names allows for local stores of constraints, w...

• Type: Conference
• Year: 2007
• Where: ESOP
• Authors: Maria Grazia Buscemi, Ugo Montanari
• Keywords: Cc Programming, Concurrent Constraint Programming, ESOP 2007, Programming Languages, SLA Requirements