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	An application server to support online evolution
	Wang, QX ; Chen, F ; Mei, H ; Yang, FQ
	2002
关键词	application server online evolution component container interceptor common service
英文摘要	Most online evolution of application depends on its runtime environment. This paper addresses how to support online evolution by application server, which is considered as third kind of system software, besides OS and DBMD. From view of requirements, evolutions of software can be divided into Jour categories: evolutions that do not alter requirements, evolutions that alter functional requirements, evolutions that alter local constraint requirements, and evolutions that alter global constraint requirements. All changes at the requirement level should be mapped to changes at the implementation level. In our approach, implementation level entities, such as components and interceptors are responsible for online evolution. Evolutions in implementation level include adding, removing, updating, and reconfiguring the entities. One of the keys to our approach is to carefully distinguish states of components and interceptors, that is, whether they are in a ready, active, executing or evolving state. A well-designed architecture and feasible mechanisms for runtime instance loading are also keys to the solution. Based on this approach, an application server prototype, named PKUAS, has been implemented and is introduced in our paper.; Computer Science, Software Engineering; CPCI-S(ISTP); 0
语种	英语
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/293901]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Wang, QX,Chen, F,Mei, H,et al. An application server to support online evolution. 2002-01-01.

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