Reliability Analysis Of Web Service Composition Based On Petri Nets

With the development of IT, Internet is gradually becoming a distributed, heterogeneous,Multi-ASes open computing environment. The emergency and popularization of Web servicestechnology have solved the problems of heterogeneous distributed computing and data reuse,which has become the mainstream of Internet technology characterized by the properties of theinteroperability, loose coupling and cross-platform. However, the function of a single componentWeb service is limited, only through compose individual component Web services, can realizeservice reuse and value-added of services, give full play to the potential of Web services.In the calculation of the service oriented, there have been more and more of the organizationand enterprise hope through the combination of different service providers offer Web serviceconstruct distributed application system. But faced with a very important problem is, how toanalysis the reliability of Web service dynamically and efficiently, thus effectively directing thediscovery and combination of services. So far, according to problems of Web servicescomposition reliability, many domestic research institutions and individuals have done a lot ofvaluable studies, but the research of how to dynamic analysis the reliability of Web servicecomposition has just begun.This paper in view of the shortages in the study of the reliability analysis of Web servicecomposition, take a deep research on reliability modeling of Web service composition based oncomponent services and technical characteristics of Web service composition, put forward amethod of Web service composition reliability modeling and analysis based on the generalizedstochastic Petri nets. This paper’s main research work includes:First of all, according to the internal structure of Web service composition, buildingreliability models of Web service composition based on generalized stochastic Petri nets, and putforward a method of effectively relieving the problem of space explosion.Then, according to the established reliability model, analyzes the parameters of Web service composition reliability, put forward a method of reliability analysis which comprehensiveconsider execution paths and operating profile, calculate the reliability of Web servicecomposition according to the reliability of interface and component Web services, and analyzesthe sensitivity of the component services and interface.Finally, prove the feasibility and accuracy of the above methods through an example.This paper take a through research on some impotant problems of Web service reliabilitymodeling and reliability analysis of Web service composition, improved the accuracy of Webservice composition reliability analysis, so as to more effectively guide the choice of componentservices and the adjustment of system architecture in the process of Web service composition.