【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.更多还原

【Abstract】 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.更多还原