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C. Enzi:
"Integrating QoSin Web service based Business Process Development Scenarios";
Supervisor: S. Dustdar, F. Rosenberg; Institut für Informationssysteme, Arbeitsbereich Verteilte Systeme, 2007.

The scope of this masterthesis is the integration of Quality of Service (QoS) in Web service based business process development scenarios.
QoS comprises many different categories, ranging from secuure and reliable messaging, as well as performance and dependability related aspects of Web services (such as throughput, response time or availability). Web service based business process development involves two comosition techniues of the current Web services stack, namely choreography and orchestration. The engineering of Web service based business processes represents a top-down modeling approach of Web services in which private executable business processes are derived from a global choreography description. An integration of the above mentioned QoS aspects throughout the choreography and orchestration layer has not been considered yet. This work will focus on such an integration effort. On the one hand the consideration of QoS aspects at the choreography description layer will be revealed by the use of Service Level Agreements (SLAs). On the other hand the mapping of QoS aspects of the choreography description layer to the orchestration layer will be analyzed in detail. For these purposes a policy for the QoS domain will be defined allowing Web service policies to be derived from the QoS obligations stated in SLAs. Subsequently an integration of these policies throughout the orchestration layer will be revealed. Finally an implementation along with a use case will be Provided as a proof of concept.