构件化分布式系统中元数据的语义级扩展  

Extending Metadata with Semantic Aspect in Component-based Distributed System

作　　者：吴燕妮[1] 张阔[1] 王小鸽[1] 田金兰[1] 陈渝[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084

出　　处：《计算机工程》2006年第12期68-70,共3页Computer Engineering

基　　金：国家"863"计划基金资助项目(2003AA1Z2090);国家自然科学基金资助项目(60203024);清华大学基础研究基金资助项目(JC2003021)

摘　　要：介绍了一种元数据的语义级扩展。该扩展基于场景信息中的行为语义,描述了构件化分布式系统内相互协作的时序约束。基于改进的场景模型所制定的场景元数据规范,使用XML Schema来描述,具有扩展性好、易于维护的特点。实验结果表明,应用场景元数据进行运行时,时序约束失配检测可以减少因非法动作所导致的资源浪费和潜在危险,从而有效提高了构件化分布式系统的协作安全。This paper proposes a metadata extension that uses the scenario information as the semantic aspect, describing the expected interaction sequences. This XML-based extension is extensible and user-friendly. With such constraints, resource waste and further damages can be avoided by preventing the illegal interactions at runtime. A prototype has been developed to illustrate the applicability of this extension. The experiments demonstrate that the prototype introduces an average overhead ratio of 6.4% in the inter-process interactions and only 0.27% in the remote interactions. The approach presented in this paper is suitable for the component-based distributed systems and affords more guarantee of reliability.

关 键 词：构件化分布式系统 行为时序约束 可靠性 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]