A Service Level Agreement Language for Dynamic Electronic Services
Electronic Commerce Research
The WSLA Framework: Specifying and Monitoring Service Level Agreements for Web Services
Journal of Network and Systems Management
Automated SLA Monitoring for Web Services
DSOM '02 Proceedings of the 13th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management: Management Technologies for E-Commerce and E-Business Applications
SLAng: A Language for Defining Service Level Agreements
FTDCS '03 Proceedings of the The Ninth IEEE Workshop on Future Trends of Distributed Computing Systems
Stochastic Discrete Event Systems: Modeling, Evaluation, Applications
Stochastic Discrete Event Systems: Modeling, Evaluation, Applications
The role of agreements in IT management software
Architecting Dependable Systems III
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Service level agreement (SLA) specification languages are designed to express monitorable contracts between service providers and consumers. It is of interest to determine if predictive models can be derived for SLAs expressed in such languages, if possible in automated fashion. For this purpose, we study in this paper the mapping of the Web Service Level Agreement (WSLA) into reward metrics defined in the Stochastic Discrete Event Systems (SDES) formalism. We associate a formal semantics with WSLA elements and map these on SDES through a five step mapping process, which includes expressions for the metrics and functions on these metrics, the time at which to predict, and the ultimate service level compliance probability. We illustrate our approach through a stock quote web service example.