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Web service composition is one of the most important research fields in service oriented cloud computing. QoS-based composition research helps the end-users get better quality performance. Yet, most research adopts single-point access orchestration. In this paper, we introduce the factors of location and time into QoS-based composition, and propose a location & time related web service distributed selection approach for composition. As shown in the example, the same web service can get different quality performance when invoked from different location and at different time. We present two algorithms to sequence the composition's execution path and generate the concrete composition with proper quality performance. A composition distributed invoking framework is also proposed.
Date of Conference: 1-5 Nov. 2010