We worked on the developing languages to formally describe and analyse quantitative requirements of software components. Quantitative requirements can be thought as characterising the Quality of Service – QoS provided by a service thus, useful as a way of classifying and ranking them according to specific needs. An efficient and automatic analysis of this type of requirements provides the means for enabling dynamic establishing of Service Level Agreements – SLA, allowing for the automatisation of the Service Broker. We developed a language for describing QoS contracts based on convex specification, and a two-phase analysis procedure for evaluating contract satisfaction based on the state of the art techniques used for hybrid system verification. The first phase of the procedure responds to the observation that when services are registered in repositories, their contracts are stored for subsequent use in negotiating SLAs. In such a context, a process phase of contract minimisation might lead to great efficiency gain when the second, and recurrent, phase of determining QoS compliance is run.

Results has been published as “Automating Quality-of-Service evaluation in Service-Oriented Computing” on Coordination Models and Languages – 21th IFIP WG 6.1 International Conference, COORDINATION 2019.

This secondment was related to Task T.2.4 – Static Verification (O.2.3)

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