Per-flow optimal service selection for Web services based processes
Journal of Systems and Software
Network Service Description and Discovery for High-Performance Ubiquitous and Pervasive Grids
ACM Transactions on Autonomous and Adaptive Systems (TAAS)
Optimization techniques for qos-aware workflow realization in web services context
RED'10 Proceedings of the Third international conference on Resource Discovery
A qos-aware web services selection model using AND/OR graph
ADMA'11 Proceedings of the 7th international conference on Advanced Data Mining and Applications - Volume Part I
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Runtime QoS-aware service selection is difficult because the number of web services providing similar functionality is large and constantly changing, and, even more challenging, due to the complicated structure of composite services. This paper proposes an efficient divide-and-conquer approach for service selection based on a high-level abstract model for service composition. The service composition model is recursively defined with (1) abstract control-flows of five general constructs ("Sequence", "Switch", "While", "Flow", and "Pick"), and (2) extended data-flows with constructs of "AND" and "OR". Based on this service composition model, a QoS model, which supports non-linear QoS aggregation, is proposed. Therefore, complex control-flows are handled in an integrated way without separating and merging multiple execution paths, and interface constraints are captured in form of data-flow declaration. This approach allows to divide the original service to several smaller services, which are then solved separately by a recursive branch-and-bound algorithm Experiments show that the proposed approach is efficient and scalable for runtime service selection, and better handles complicated structure of service composition than existing approaches.