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机构地区:[1]四川师范大学计算机科学学院,成都610068 [2]中国科学院计算技术研究所,北京100190
出 处:《计算机科学》2014年第8期202-208,共7页Computer Science
基 金:国家自然科学基金(60970113);国家自然科学基金青年基金(60903073);四川省教育厅青年基金项目(08zb02);四川师范大学校级项目(11KYL03)资助
摘 要:服务质量QoS描述了一个Web服务满足用户需求的能力。在动态、开放和多样的网络环境中,由于QoS的不确定性使得服务选择结果与实际结果偏差较大,服务质量难以保证。针对此问题,设计了一种支持服务QoS差异度控制的Web服务发现模型,在该模型中,通过增加第三方监控Interceptor,保证了服务提供者和消费者提供给QoS认证中心的信息以及QoS认证中心交给服务注册中心的信誉度数据的真实性,另外其也作为双方能公平公正地遵守SLA的公证方,保证了服务的合法交易;同时,在服务使用者端和QoS认证中心处增加了QoS属性本地规约验证机制和全球规约验证机制,其可以控制用户的QoS需求值和提供者给出的提供值的差异度,使得在交易过程中能得到服务和服务提供者的一个较准确的客观的信誉度评价。实验表明,该方法能够有效控制QoS差异度,并为用户提供更加满足需求的Web服务。Quality of Service (QoS) describes the ability of a service meeting customer needs. In a dynamic, open and di- verse network environments,the QoS uncertainty makes a large deviation between the service selection results and the actual results, as well as the difficulty of guaranteeing the QoS. To solve this problem, a Web service discovery model was designed to support QoS difference control. In this model, we added the third party monitoring which is called Inter- ceptor to ensure the reality of the QoS certification center's information provided by service providers and customers, and its real credit data to service registry center. Also, as a notary, it ensures both sides comply with SLA fairly and justly,and ensures the legitimate transaction service. Furthermore, QoS attribute local compliance verification mecha- nism and the global compliance verification mechanism were added in the service user terminal and QoS certification center, to control the difference between the users' required values and offering data by providers,making a more accu- rate and objective reputation from service and service providers in the transaction process. The experiment indicates that this method can effectively control the QoS difference,which can provide more satisfying Web service for the users.
分 类 号:TP391[自动化与计算机技术—计算机应用技术]
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