Research On Some Key Technologies Of Web Services Discovery

The open Internet application, together with the service-oriented computing, leads to great changes of Internet-based software system in main shape, production mode, execution way, and occupation mode under Internet environment. Application system is under an open coordination software environment composed of various software service entities, and one of the trends that Internet software will behave in the future is to construct software application system through service discovery and service dynamic composition. Software service and software service coordination represented by Web service have become a new Web application shape, and how to make service discovery effectively guarantee service reuses and composition compatibility are of great importance both in the improvement of Internet software production efficiency and in the implementation of cross-organization business integration.However, the current Web services discovery has problems in all-sidedness of service description, flexibility of matching algorithm, and validity of supporting service composition, which are challenges in the field of service-oriented computing. Facing these challenges, this dissertation firstly deeply studies some key techniques including Web service description language, service matching algorithm, service selection, and system topology, around an intact Web service discovery process. Then, it establishes an architecture of Web service discovery system to provide more effective support for the realization of correct and flexible interaction, as well as service dynamic composition among Web services. Main works of the dissertation are as follows:(1) For Web service description, the dissertation not only puts forward a common Web service capability description model{S, C, P}, but also designes QWSDL(Qos-based Web Service Description Language), on basis of systematically study on Web service capability description language, which gives a full description of Web service functionality, service behavior as well as Qos (quality of serivce) information.(2) For service matching algorithm, the dissertation presents a "three levels, five kinds" matching model by inducing the existing service matching algorithm. Since the current Web service capability matching algorithm is not flexible enough, the dissertation introduces similar function to evaluate service similarity of relaxed match, which on one hand, ensures high recall and high precision of service discovery, on the other hand, improves the efficiency of service...