【摘要】 普适计算环境固有的内在复杂性对当前的基础软件提出了新的挑战,迫切需要一种具有感知和自适应能力的中间件。提出了一个由接口、框架和情境元模型组成的自适应中间件,给出了在CAR构件平台上的设计与实现。为获取构件信息和对外提供服务,接口元模型支持同步和异步接口。情境元模型在构件对象内建模情境信息,计算实体间以基于异步事件通知方式交互。框架元模型分类和管理构件,随着运行时计算环境的变化动态改变中间件的结构和行为。软件实体感知环境的变化,实体间以松耦合的方式交互,动态改变自身的结构和行为,满足普适计算环境下的动态自适应需求。更多还原

【Abstract】 The inherent complexity of ubiquitous computing poses many new challenges for software infrastructure,which needs urgently the adaptive middleware.This paper proposed a self-adaptive middleware in ubiquitous computing environments,which is composed of the three meta-models,namely the interface,framework and context meta-models.The design and implementation on CAR component platform were presented.The interface meta-model provides access to the services and the internal information and state of a component in terms of asynchronous and synchronous interfaces.The context meta-model represents context information in component object and mask distribution problems in ubiquitous computing environment based asynchronous event notification.The framework meta-model classifies and mana-ges component,makes changes to middleware structures and behaviors according to the changing runtime environments.At last,the software system meets the dynamic self-adaptive requirement in ubiquitous computing environments.更多还原