QoS prediction for composite web services with transactions

  • Authors:

  • Jiangxia Wu;Fangchun Yang

  • Affiliations:

  • State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China;State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China

  • Venue:
  • ICSOC'06 Proceedings of the 4th international conference on Service-oriented computing
  • Year:
  • 2006

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Abstract

Prediction of the Quality of Service (QoS) of Composite Web Services (CWS) makes it possible to tell whether the CWS meets the nonfunction requirements, and to choose the CWS with better QoS from those with similar function. QoS prediction is based on the estimation of the execution process of CWS. For the reliability of CWS executions, Web service transaction has been proposed, which will affect the execution process. However, the existing approaches have not considered the effect. Thus they have limited accuracy when predicting the CWS with transactions. The paper proposes an approach for QoS prediction of CWS with transactions. A specification model is defined to specify execution processes of CWS according to the exception handling policies of transactions. Based on the model, an algorithm is proposed. The experiment proves that the algorithm has much lower error rate and better feasibility than the previous approaches when predicting CWS with transactions.