Web服务组合运行时的容错处理

基于WebJet服务组合组装与运行平台，设计了一个基于反馈容错机制、支持Web服务组合运行时自动容错处理的基本框架。针对服务组合运行时的时间QoS质量和用户SLA计算容错选择因子，运用聚类算法确定容错边界值，提出容错处理的一般映射方法，并给出了故障处理及流程重构区域计算方法。系统支持流程在线自恢复，适应复杂的网络生态环境，为流程执行时业务功能与服务质量的保障提供了一种有效的机制。

Fault-tolerant processing mechanism of Web service composition in run-time

Based on the WebJet service composite and assemble platform，the author designs one based on the feedback fault-tolerant mechanism，supported the run-time automatic fault-tolerant processing frame.Calculates the fault-tolerant choice factor in view of the service composition run-time’s QoS quality and user’s SLA，and uses clustering algorithm ascertain the fault-tolerant boundary value，proposes the fault-tolerant processing general mapping method，simultaneously gives the breakdown processing method and the flow restructured region computational method.System support flow restoration-online，adapted the complex network ecological environment，provide a kind of effective mechanism to guarantee both functionality and QoS of the workflow during execution.