Estimating Response Time and Availability of Composite Web Services From BPEL Workflow

The users of Web service have been given chances to select the high quality services from many services, because of the increase of Web services with the advances of Web service technology. Some technologies which measure the quality of Web service quantitatively are needed to compare the quality as services. However, many existing studies focus on the individual Web service, therefore there is no effective methods of quality measurement is established for integrated Web service. In this paper, we propose a method which estimates the quality statistically as one of the methods of quality measurement for integrated Web service. Associating an operation with each of structural constructs derived, we translate the given workflow into a formula, from which we derive the estimation of the response time and the availability of the composite Web service.