Research On Credible Web Service Composition Based On Graph

As the expanding of e-commerce, the demand of sharing and integration of enterpriseapplication increases a lot based on Internet environment of cross platform of hardware andphysical space. Web service has been become the solution of integration of enterprise applications,as it has the features of loosely coupled, high packaging and cross-platform. How to fulfill thefunction and credibility needs has become the hot area in web service research.The credibility of services is important, because the first issue of Web Service Composition ischoosing right Web service from mass services. Meanwhile, response time is also a factor ofchoosing web service. Therefore, web service composition technology should take both thecredibility and the efficiency into account.With the help of semantic web, ontology, graph theory and other related knowledge, this thesishas a research on service composition and credibility. Compared to previous research work, theinnovation of this thesis is: Firstly, this thesis proposes the trust assessment model based on QoSand reputation which takes QoS, history evaluation, reputation and credibility into account topromote the completeness and accuracy of the trust model. Secondly, this thesis designs the methodof obtaining data and computation to evaluate the quality of web composition service to ensure thecredibility. Thirdly, this thesis designs the credible web service composition method based on graph.We add semantic information and the credibility into WSDL so that we convert WSDL into OWL-Swith quality information. We get the final best combined path with the help of service matchingbase on the OWL-S files and Heuristic Bidirectional Searching based on graph. Finally, this thesisdevelops simulation platform to validate the trust model and the composition method based ongraph. The simulation results show the efficiency and the feasibility of the model and the algorithmproposed in this thesis.