Event-Driven Dynamic Web Services Composition: From Modeling to Implementation

Web services and service-oriented architecture are emerging distributed computing paradigms to publish and access software components as services. Various enterprises now publish their business as Web services. Business processes of these enterprises involved in B2B and B2C transactions require composition of distributed heterogeneous services to accomplish a task. Business processes are complex, dynamic and event-driven. To capture the dynamic nature of business process we need to choreograph and orchestrated the business partners and the task involve in the process. With the development of standard like Web services resource framework and Web services notification, Web services now become stateful and now supporting event and notification. To model the Web services based event-driven composition and business process both event and state should be considered. In this paper we propose event calculus and BPEL based business process modeling and composition. We propose semantic based service-oriented grid architecture for implementation of event-driven business processes