Research On Web Services Composition Application Towards Context-aware

The Context-aware computing developed with Ubiquitous or Pervasive Computing has extended into Web service and web service composition of SOA. On the one hand, the current web service composition engines are manual mode and lack of flexibility. On the other hand, they don't take the context into account in composition strategy, so they may return some unnecessary result, the efficiency and adaptability of composition application is low.This dissertation analyzes the context-aware in web service composition and presents a web service composition engine WSCETCA towards context-aware. The context in web service composition can be classified by analyzing the process of web service composition: the context of web service instance(I-Context),the context of web service(W-Context), the context of composited service(C-Context), the context based on quality of services(Qos-Context), the context of users(User-Context), and the information of context is described by OWL-S. The Context information is embeded in header of SOAP to transfer. Context manager and context database are designed to store,control and drive these context information. Services, semantic information of services register and semantic interface of services discovery are provided by expanding UDDI semantically. Consequently, an effective service discovering, matching and compositing towards context-aware can be achieved.An engine prototype is developed by some tools, such as Eclipse, Jena Framework, Apache Axis etc. By an application example of context-aware, the ontology is developed to supply the application by Protégé3.4 beta to validate the function of WSCETCA. Finally, a conclusion that WSCETCA can run smoothly with the increasing of the length of the transfering message and the number of current online users by testing the responding time of the SOAP messager with different length and online users with different number.