【摘要】 提出了一种基于QoS约束的Web服务选择和排序模型,在研究Web服务的三维QoS模型的基础上设计基于QoS约束的服务选择模型,进一步研究服务效能的概念和量化方法并设计基于服务效能的排序模型.该模型的原型系统已经在国家地质调查网格中得到应用,结果表明模型能够有效保障用户对服务的需求,具有很高的查准率、响应率以及较好的负载均衡能力,提高了基于面向服务架构(SOA)的网络应用的可用性.更多还原

【Abstract】 UDDI(Universal description,discovery and integration) specification plays an important role in SOA(Service oriented architecture),but it does not take service selection and rank problem into account,thus can not guarantee the real-time validity of web services responded to service requester.A QoS-guaranteed and distributed mechanism of Web service discovery was proposed, which supports Web service discovery with QoS constraints and is compatible with the UDDI specification.A novel three-dimensional QoS model of Web services was introduced which includes the QoS metrics of the hosting site of Web services,Web services,and method of Web services,and a Web service selection algorithm was designed.The concept and measure method of Web service effectiveness were proposed,then a Web service ranking algorithm based on the effectiveness of Web service was designed.Furthermore,a prototype was implemented and used by the national geology grid project.The comprehensive experiment shows the new model possesses high precision,high response rate and better influence on the load balance of Web service.更多还原