面向用户的Web服务可靠性计算模型  

User-oriented Web services reliability computing model

作　　者：苏志勇[1] 周颖[1] 李必信[1] 

机构地区：[1]东南大学计算机科学与工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2008年第4期605-610,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省自然科学基金资助项目(BK2007513);国家自然科学基金资助项目(60773105;60473065);国家高技术研究发展计划(863计划)资助项目(2007AA01Z141);教育部新世纪优秀人才支持计划资助项目(NCET-06-0466)

摘　　要：基于SOA,从用户的角度分析并计算Web服务及其应用的可靠性.首先采用一种扩展的UDDI模型收集可靠性相关数据,计算基本服务的可靠性、转移失效率和转移概率.然后基于BPEL文档构造组合服务的结构图,定义其结构属性,将转移失效率作为基本服务可靠性的加权系数,给出各种结构的组合服务的可靠性计算公式.最后在此基础上设计可靠性预测的递归算法用于计算Web应用的可靠性.实验结果表明:基于结构图的方法具有简便性和易处理性.An approach is introduced to analyze and compute the reliability of Web services based on service-oriented architecture （SOA） from the user＇s perspective. Statistical data of reliability are first collected using an extended universal description, discovery and integration （UDDI） model, then the reliability, transition-probability and transition-failure rate of basic services are computed based on these data. A kind of structure chart is constructed for composite services based on the business process execution language （BPEL） document. Taking transition-failure rate as the weighted coefficients of reliability, the reliability formulae of several composite services are obtained. Finally, a recursive algorithm is built to evaluate the reliability of Web service application. The experimental results show that the structure chart-based approach is simple and tractable.

关 键 词：面向用户 可靠性 结构属性 

分 类 号：TP311.5[自动化与计算机技术—计算机软件与理论]