期刊名称：International Journal of Computer Science & Technology
印刷版ISSN：2229-4333
电子版ISSN：0976-8491
出版年度：2014
卷号：5
期号：4
页码：296-299
语种：English
出版社：Ayushmaan Technologies
摘要：Asynchronous Event Handling and Synchronous Exception Handling mechanisms are devised as part of a forward recovery model to program robust context-aware applications which enable designing recovery actions to handle different kinds of failures such as service discovery failures, service binding failures, exceptions raised by a service, and context invalidations. Previously these context aware applications run on trusted servers which are assumed to be resilient to crash failures also. In this paper, we present a collaborative model for context-aware applications along with server deployment scenario. The proposed approach is developed for building collaborative activities in which users and environment services cooperate towards some shared objectives and tasks. We propose to use new server deployment scenarios such as replications and back up procedures to build more robust application architecture. The specification model allows expression of policies related to context-based discovery and secure access of resources, and role-based interactions among users and environmental services.
