基于QoS的Web服务发现模型研究

Web服务的大量涌现对服务的发现提出了挑战,UDDI基于关键词和简单分类的服务发现机制已经不能很好地满足需求。服务发现需要基于服务质量QoS来对服务进行选择和排序。本文在分析现有相关研究的基础上,首先分析了影响服务发现的三类质量因素:静态因素、动态因素和统计因素,并采用“基于约束的需求规范语言”的语法和语义来描述质量因素的约束。其次,扩展了现有的WSDL,全面地描述Web服务的质量。最后提出了基于QoS的Web服务发现模型,该模型不需要改变UDDI的内部实现,能够直接在现有的UDDI服务上进行扩展。

Research on Web Service Discovery Model Based QoS

With the large growth in number of Web services,the current Web service discovery mechanism becomes inefficient.Due to the adoption of keyword-based and simple classification,the service discovery mechanism can not meet the requirement of consumers currently,the service discoveries need to be selected and ordered based on quality of service.Based on research,the paper analyzes the three factors influencing the service discovery,namely as static factors,dynamic factors,statistical factors and adopts the syntax and semantics of the Constraint-based Requirement Specification Language to describe the quality constraint firstly,And then describe the quality of service by extensions to WSDL,at last a web service discovery model is proposed,which can be implement through the direct extension to the existing UDDI services.