移动计算环境中应用程序感知适应性的设计  

Application Aware Adaptiveness in Mobile Computing Environment

作　　者：李国东[1] 宋书高[1] 张德富[1] 

机构地区：[1]南京大学计算机软件新技术国家重点实验室,南京210093

出　　处：《南京大学学报（自然科学版）》2003年第2期219-228,共10页Journal of Nanjing University（Natural Science）

基　　金：国家863项目(863-306-ZT06-04-4)

摘　　要：　移动设备和无线网络的发展使得移动数据存取越发重要,而移动计算应用程序必须感知环境的变动来更好地利用有限的资源提供相关的扩展功能.提出能够用来开发环境敏感适应性应用程序的技术和原型,并对低层的运行系统进行了部分实现.在管理环境变化和将环境变化报告给应用程序的新体系结构中,环境变化被抽象成类型事件,事件、传递政策、适应性策略和适应性反应被组织成可扩展类型层次结构,从而将环境参数管理的复杂性限定在底层运行系统中,简化了应用程序的设计.该体系结构不但能够用于建造新的移动性感知应用程序,也可以很方便地将移动感知适应性结合到现存的应用程序中去.实验结果证明了系统的有效性.Mobile devices and wireless networks are becoming more powerful and affordable, leading to the growing importance of mobile data access. Mobile computing applications must be made aware of mobility not only to utilize constrained resources better, but also to provide enhanced mobility_related functionality. In this paper suitable techniques and prototype tools facilitating building adaptive environment_aware applications and implementing underlying run_time system are presented. We propose a novel architecture in charge of managing and exposing the environmental change, in which the environmental change is modeled as the asynchronous event. Events, event delivery policies and adaptive strategies are organized with hierarchy structure, therefore easing the management of the environmental variance and the design of application. Our architecture forms a powerful basis not only for building new mobility aware applications, but also for incorporating mobility aware adaptiveness into legacy applications and middle_ware. Experiential results prove that our system is conducive in constructing adaptive applications.

关 键 词：应用程序 感知适应性 移动计算 层次结构 事件 框架 程序设计 体系结构 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论]