基于组件技术的软件容错模型架构设计

摘要

容错技术是提高系统可靠性的重要途径,软件又是容错技术的灵魂,对于提高系统安全性和可靠性等具有重要的作用.面对安全关键系统功能安全的需求,传统的软件开发方法和模型架构已无法满足.为此,设计了一个新颖的具有容错功能的基于组件技术的软件模型架构,该模型将理想的容错结构(Idealised Fault-tolerant Component)和C2(Com-mand and Control)架构有机地结合起来,并将容错机制嵌入到这个新的结构中,定义了正常和异常处理组件以及组件内、外部的接口.此软件容错模型架构利用了组件技术并嵌入了容错机制,能有效地提高系统的功能安全性,设计者能在系统开发的初级阶段就对容错性能进行考虑和设计,用户还能根据具体的需要和应用特点定制自己的容错机制并嵌入到软件容错模型架构中,使其具有支持范围广泛的容错功能.%A novel software fault-tolerant architecture is designed in this paper,and it combines an idealised fault-tolerant component,the C2 architecture style and embed fault tolerance techniques into component definitions.The resulting architec-ture is described by normal-and abnormal-activity components and interfaces resulting to improve functional safety of safe-ty-critical systems,and support a wide range of fault tolerance features.Use of this architecture enables to reason about system dependability already from the earliest development stages on,and to customise fault tolerance strategies according to application characteristics.