Research And Development Of Web Services Composition Based On Context Awareness

Web service is a kind of new web application, and is also a kind of distributional application. It can resolve the problems such as resource sharing, intercommunication and interoperability and so on within the business enterprise and heterogeneous system in the internal business enterprise. But the function of individual Web service is limited, and shared web services can make it as a union. So it can provide more powerful services, accelerate the speed of system development, reduce development costs, and satisfy the needs of users. At present, under SOA (Service-Oriented Architecture), Web services composition becomes the key technology in enterprise business integration. However, because the web services composition has no sense of the context of the services, many of the services are proved to be useless. Therefore, it is very important to use context information and find more accurate services for the users.Considering these problems in web service composition, the context-aware technology is used in web services searching and composition process in order to provide better services for users. And the main research works done in this thesis are as follows:1). This thesis introduces Web service composition, Semantic Web, Context-aware technology, Visualization technology, related background, as well as their development condition and key technologies.2). This thesis analyzes the key technologies of context-aware and ontology description language, the principles of ontology construction, the method of ontology construction and so on. And based on the above, this thesis sums up the context of the ontology construction process. According to this process, the context ontology will be designed and constructed, which includes user context information and service context information. And the context reasoning rules will be used in service searching, in order to find the service to satisfy the user's expectation.3). This thesis realizes web services composition based on context awareness (WSCBOCA) model, and will achieve WSCBOCA model's main functions. At the same time, this thesis has constructed the private UDDI registry services' center to universal storage and manages the service resources. And it can provider host for services publisher, and at the same time make a foundation for the requester's search service. During the process of searching services, context ontology information can be used to search relevant services information, and combine the services on the Triana platform.4). This thesis analyzes the scientific computing visualization, the significance of scientific computing visualization research, visualization features and algorithms, visualization toolkit VTK and so on. According to the characteristic of the visualization information, the model of WSCBOCA is applied to visual fields to check its' feasible and effective.This work is supported by Wuhan International Cooperation Projects," Study and Implementation on Semantic-based Visualization Services Publishing and Matching Platform" (Project No.200970634269).