QoS-oriented Assessment Of Web Services Discovery

With the development of Web services technology, more and more Web services provide the same service, how to find the needs that from the same function Web services has become a hot spot. However, the existing keyword-based Web service discovery can not completely meet the customer needs. In response to this question, this thesis proposes a Web service discovery model which faces QoS-oriented evaluation based on the user's QoS needs.QoS-oriented assessment of Web service discovery involves the QoS requirements, QoS evaluation, QoS feedback and Web Services selection problem. In this thesis, our research work contains mainly the following three parts:1. Analysis of Web service QoS requirements. Based on the original service-oriented architecture this study expands the UDDI registration mechanism. A Web service QoS information has added to UDDI, which made the Web services support the service discovery of QoS. This thesis changed the way of the use of agent, and takes in at UDDI add QoS monitoring module, which in the service discovery process does not affect the original speed of the service discovery.2. Because the QoS for Web services has fuzzy features, this thesis uses triangular fuzzy numbers to express Web service QoS evaluation index, and defines the express way of the triangular fuzzy number. Aim at QoS for different indicators it gives a fuzzy express the standardization methods, and presents acomprehensive evaluation based on triangular fuzzy number.3. Set up a user QoS feedback model. This study introuduces user QoS feedback mechanism to monitor the services providers of the services ads credibility through the way of the solicitant for serves feeding back information. At the same time, service providers may also make use of feedback information of QoS to improve the service quality of Web services.