基于可生存性规范的软件构件系统恢复的建模与推理

从基于构件的系统在面临各种不同的恶意攻击、系统故障和意外事故时,根据预先定义好的生存性规范为用户提供不同等级的系统服务出发,研究了构件系统恢复中的一些关键问题.其主要贡献是:(1) 提出了基于构件家族和构件安装顺序的服务核表示方法,该方法能够准确表达系统在不同条件下为用户提供能够感知的服务;(2) 建立了基于构件兼容性和构件安装执行的构件系统恢复性质的推理规则,用于判断系统恢复的成功性(新启动的服务能够正常工作)和安全性(原有的服务不会受到损害);(3) 提出了基于投影的构件安装执行的简化算法,为大规模构件系统恢复的性质推理分析提供了支持.利用基于可生存性规范的构件系统恢复的分析流程,可以在实际中系统地应用相应的推理规则.最后通过一个基于构件的移动视频点播MVoD系统来展示所提出的模型与方法的实用性和有效性.

Modeling and Reasoning of the Software Component Based System Recovery Based on Survivability Specification

The component-based system will provide a predefined survivability specification which consists of corresponding degraded services in the presence of various kinds of malicious attacks,system failures or accidents. The main contributions of this paper are(1) presenting the method to represent service core based on component families and installation orders,which can precisely capture the system services perceived by users;(2) proposing the reasoning rules of system recovery based on component compatibility and installation execution,which are used to judge the success property(the newly started service works well) and safety property (formerly started services are not damaged);and(3) presenting the algorithms to simplify installation execution based on the concept of projection,which supports the reasoning analysis of system recovery of big scale.By the analysis process based on survivability specification,the corresponding reasoning rules can be systemically applied in practice.A component-based system named MVoD(mobile video-on-demand) is illustrated to demonstrate the practicability and efficiency of the formal model and the analysis method.