Distributed and Parallel Databases
System structure for software fault tolerance
Proceedings of the international conference on Reliable software
QoS-Aware Middleware for Web Services Composition
IEEE Transactions on Software Engineering
QoS Aggregation for Web Service Composition using Workflow Patterns
EDOC '04 Proceedings of the Enterprise Distributed Object Computing Conference, Eighth IEEE International
An approach for QoS-aware service composition based on genetic algorithms
GECCO '05 Proceedings of the 7th annual conference on Genetic and evolutionary computation
Using WS-BPEL to Implement Software Fault Tolerance for Web Services
EUROMICRO '06 Proceedings of the 32nd EUROMICRO Conference on Software Engineering and Advanced Applications
A model-driven approach to describe and predict the performance of composite services
WOSP '07 Proceedings of the 6th international workshop on Software and performance
A probabilistic approach to modeling and estimating the QoS of web-services-based workflows
Information Sciences: an International Journal
A Flexible Approach for Business Processes Monitoring
DAIS '09 Proceedings of the 9th IFIP WG 6.1 International Conference on Distributed Applications and Interoperable Systems
ICSOC/ServiceWave'09 Proceedings of the 2009 international conference on Service-oriented computing
Generalized aggregate Quality of Service computation for composite services
Journal of Systems and Software
A Survey of Web Services Provision
International Journal of Systems and Service-Oriented Engineering
A causal model to predict the effect of business process evolution on quality of service
Proceedings of the 9th international ACM Sigsoft conference on Quality of software architectures
Information Sciences: an International Journal
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With a large number of web services offering the same functionality, the Quality of Service (QoS) rendered by a web service becomes a key differentiator. WS-BPEL has emerged as the de facto industry standard for composing web services. Thus, determining the QoS of a composite web service expressed in BPEL can be extremely beneficial. While there has been much work on QoS computation of structured workflows, there exists no tool to ascertain QoS for BPEL processes, which are semantically richer than conventional workflows. We propose a model for estimating three key QoS parameters - Response Time, Cost and Reliability - of an executable BPEL process from the QoS information of its partner services and certain control flow parameters. We have built a tool to compute QoS of a WS-BPEL process that accounts for most workflow patterns that may be expressed by standard WS-BPEL. Another feature of our QoS approach and the tool is that it allows a designer to explore the impact on QoS of using different software fault tolerance techniques like Recovery blocks, N-version programming etc., thereby provisioning QoS computation of mission critical applications that may employ these techniques to achieve high reliability and/or performance.