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一种支持QoS约束的Web服务发现模型
引用本文:杨胜文,史美林.一种支持QoS约束的Web服务发现模型[J].计算机学报,2005,28(4):589-594.
作者姓名:杨胜文  史美林
作者单位:清华大学计算机科学与技术系,北京,100084
基金项目:国家自然科学基金(90412009)资助.
摘    要:服务质量(QoS)描述了一个产品或服务满足消费者需求的能力.提供有保证的QoS是Web服务在商业应用中获得成功的关键.如何动态地选择出最适合用户需求的Web服务正在引起研究领域的关注.该文提出了一种支持QoS约束的Web服务发现模型(WSDM-Q).该模型定义了一组描述Web服务QoS及信誉度的分类tModel,引入了QoS量化的概念,采用了QoS协商和反馈机制,支持携带QoS描述信息的服务发布和基于QoS约束的服务发现.协商机制允许服务提供者根据运行时的状态对服务请求进行接纳控制,反馈机制允许服务注册中心对服务提供QoS的信誉度进行动态评估和调整。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.作者已经基于Mierosoft.Netf平台和Microsoft UDDI服务实现了一个原型系统.

关 键 词:服务发现  服务质量  Web服务  模型  约束

A Model for Web Service Discovery with QoS Constraints
YANG Sheng-Wen,SHI Mei-Lin.A Model for Web Service Discovery with QoS Constraints[J].Chinese Journal of Computers,2005,28(4):589-594.
Authors:YANG Sheng-Wen  SHI Mei-Lin
Abstract:Quality of Service (QoS) describes the capabilities of a product or service to meet the requirements of consumers. The provision of guaranteed QoS is very critical to the success of web services in mission critical business domains. How to dynamically select web services that can best meet the requirements of consumers is an ongoing research direction in web service community. This paper proposes a model for web service discovery with QoS constraints called WSDM Q. A set of QoS categorization tModels and a kind of reputation categorization tModel are defined in the model to describe the QoS attributes of a service and the degree of guaranteed QoS delivered by a service respectively. The concept of quantification is introduced in the model to transform between the QoS attributes and QoS categorizations. Furthermore, a negotiation mechanism is used to allow admission control on the service provider side; a feedback mechanism is adopted to allow dynamic evaluation and adjustment of reputation of web services. Because of no need for changes in the inner implementation of UDDI service, it is easy to implement the model through the direct extension to the existing UDDI services. The authors have implemented a prototype based on Microsoft.Netf platform and Microsoft UDDI service.
Keywords:service discovery  quality of service (QoS)  Web service  model  constraint  
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