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e-Technology, e-Commerce, and e-Services, IEEE International Conference on (2005)
Hong Kong, China
Mar. 29, 2005 to Apr. 1, 2005
ISBN: 0-7695-2274-2
pp: 181-185
Michael C. Jaeger , Technische Universit?t Berlin, Germany
Gregor Rojec-Goldmann , Technische Universit?t Berlin, Germany
Gero M? , Technische Universit?t Berlin, Germany
For the composition of Web services non-functional characteristics are commonly considered criteria for finding and selecting available services. Our work focuses on a mechanism that determines the overall Quality-of-Service (QoS) of a composition by aggregating the QoS of the individual services. With aggregated QoS it can be verified whether a set of services satisfies the QoS requirements for the whole composition or not. The aggregation performed builds upon abstract composition patterns, which model basic structural elements of a composition like parallel paths, a sequence, or a looped execution.<div></div> In this work we extend existing composition patterns with the abilities to consider dependencies between services. Furthermore we introduce, how to use the pattern-based aggregation in the monitoring process during run-time. We will explain how the data derived from the monitoring process can be used to calculate a more accurate aggregation of QoS for the composition.

G. M?, M. C. Jaeger and G. Rojec-Goldmann, "QoS Aggregation in Web Service Compositions," Proceedings. The 2005 IEEE International Conference on e-Technology, e-Commerce and e-Service(EEE), Hong Kong, 2005, pp. 181-185.
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