Model of Supporting Composite Event and Its Implementation in Middleware

This paper gives introduction to connectable object technology of COM and the recognition of composite events.Then EFL event model,which improves the infrastructure of connectable object technology with advanced features and extensions is described.The model is designed to support the recognition of composite events,and XML-based description of complicated relation of events is adopted in the subscription of composite event.Reflective middleware PURPLE,based on EFL,is reflective middleware architecture.The application of EFL event model in PURPLE during the process of environment detection and self-adaptation is also presented.