关键词: 普适计算，自适应中间件，接口元模型，情境元模型，框架元模型

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 manages component, makes changes to middleware structures and behaviors according to the changing runtime environmenu. At last, the software system meets the dynamic self-adaptive requirement in ubiquitous computing environments.

Key words: Ubiquitous computing, Self-adaptive middleware, Interface meta-model, Context metes model, Framework meta-model