Design And Implementation Of Web Services Dynamic Orchestration System

With the development of economic globalization, more and more commercial organizations come into deal with their business in a world-wide field. In order to be suitable for the changing market with growing competition, many business companies have begun to issue their professional business processes as Web Services onto the Internet to provide services for their partners. Strongly stimulated by the market requirement, Web Services composition now has been as a hotspot studied by academic and industrial organizations and it has also become one of important methods to realize dynamic business process.Workflow technology is one of the hotspots in computer applied field since the 1990's, is one of the most important technologies about Web services orchestration. This paper studys the workflow and web services technologies, and to the shortages of existing Web services orchestration systems, this paper proposes a Web services orchestration model. According to this model, this paper designs and implements a web service orchestration system, which supports graphic modeling, dynamic deployment and binding of Web Services, and optimal choice of Web Services based on QoS and so on.This paper presents key component in this system—graphic business process designer, and also evaluates this tool by an application instance. This designer adopts the BPEL4WS1.1 specification as business process modeling description language, provides graphic modeling services, acquires WSDL dynamically and manages the elements in a unified way, so can meet the needs of the dynamic business to Web services orchestration.For the purpose of choosing optimally and deploying web services, we extended WSDL and UDDI to support QoS and dynamic binding. Based on the research of QoS of Web Services, this paper puts forward a model and computation algorithm of QoS of Web Services, and realizes dynamic choice of Web Services based on QoS, in order to achieve web services dynamic orchestration cooperating with the orchestration engine。...