Research & Implementation Of Web Service Registry With Dynamic QoS

With the development of Internet technology, the number of Web service is increasing rapidly and the applications of Web service are becoming more and more complex.Because of the uncertainty of the network environment the quality of Web service is different.Ensuring the real-time and accuracy of QoS in the web service registry to improve user satisfaction has become a problem which has to be solved.At present, most studies are about static QoS, while dynamic QoS acquisition and updating method is fewer.A web service registry with dynamic QoS is designed and implemented in this paper, including service publish, QoS agent, service discovery, database interface layer and so on.In service publish process, services are described by WSDL, basic information and QoS information of services are obtained by extraction algorithm from WSDL document and stored in database.In order to collect and update of the QoS information dynamically, QoS agent which implements QoS collection, QoS updating and QoS screening, is added in the framework of the registry. Dynamic QoS information is collected by the web service log. Considering of the uncertainty of the operation environment, subjectivity of providers and feedback of users.A method is proposed and implemented to implement real-time updating and quantitative correction. It ensures the real-time and accuracy of QoS. The selected algorithm to meet requirements of the interface and QoS is designed in this paper. It can reduce the number of candidate services and improves the users’ efficiency. The flexibility of the system is enhanced by choosing the third-party database driver in the database interface layer to connect with database.The system is implemented on the basis of open source project JUDDI in MyEclipse environment. Then response time and user appraisal are used to analyze the performance of the web service registry. Experiment verified the rationality and effectiveness of the web service registry. At a certain extent, the web service registry can improve the efficiency of query.