基于具体事务的补偿支持服务替换QoS模型  

A Compensation-Supported Substitution QoS Model Based on Detailed Transaction

作　　者：印莹[1] 张斌[1] 张锡哲[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2010年第1期31-34,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2009AA012122);中国博士后科学基金资助项目(20080430185);国家自然科学基金资助项目(60803026;60903009)

摘　　要：针对传统替换模型中缺乏事务支持而不可用的情况,提出了一种补偿支持的服务替换QoS模型.该模型充分考虑了服务间多关系以及事务Web服务特性,将事务补偿代价与替换选取代价有机结合,建立了全面评价补偿支持的替换服务QoS目标函数,在此基础上,提出了全新QoS驱动的补偿支持服务替换算法.实验证明该模型不仅保证了替换过程中事务原子性和数据一致性,而且提高了系统的可靠性和可信性.A QoS-substitution model with composition-supported is developed,since the traditional substitution models are unavailable due to lack of transactional support in the execution process of Web service. In the model,the interrelation between many kinds of services and characteristics of Web service for a certain business are all fully considered. Combining the composition cost for a failed or unavailable service with that to substitute the same one in the whole execution process of Web service,an objective QoS function is provided to evaluate comprehensively the composition-supported service that will be substituted. Then,a new QoS-driven service substitution algorithm supported by composition is proposed. Testing results demonstrated that the model proposed not only ensures the atomicity and data consistency in the service substitution process,but also improves the reliability and of service systems.

关 键 词：WEB服务 替换 补偿 事务 QOS 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]