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Abstract-Current QoS-aware automatic service composition queries over a network of Web services are often one-time in nature. After a network of Web services is built, such queries are issued once, and answers are found from the scratch. The underlying assumption is that the participating Web services are rather static so that their functional and non-functional parameters seldom change. However, such an assumption is often baseless. New services come and go, service APIs change gradually, and QoS values fluctuate. Therefore, a support for efficiently handling "continuous" service composition queries is desired. In this paper, we propose an event driven continuous query algorithm for QoS-aware automatic service composition problem to cope with different types of dynamic services. Moreover, we integrated this algorithm in our service composition system, QSynth. Finally, we evaluate our proposal using both real QoS data and synthetic Web service data and show the superior performance of ours, compared to the state-of-theart solution which won the performance championship of Web Service Challenge in 2009 and 2010.

Many techniques have been proposed to transform BPMN into BPEL. The transformation for single BPMN process is studied well. But multiple BPMN processes often suffer fro m mismatch issues. This paper aims to better transform multiple BPMN processes containing interaction mismatches. The challenges for such transformation are: 1) ensuring transformed BPEL processes compatible 2) ensuring transformation interactionpreserved, which means keeping interactions those do not cause transformed processes mismatch preserved and transformed. In the paper, interaction mismatches are classified into two categories: static and runtime interaction mismatch. Both of them can be discovered by our approach based on interaction control-flow relations. For better transformation, discovered mismatch interactions are minimized and only the minimized result will not be transformed. A case study is given to illustrate the approach. The transformation also provides general support for transforming cross-organizational business processes into executable processes.

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