Failures Handling Strategies of Web Services Composition Base on Petri Nets

摘要

Web services are distributed components that provide functionality applications through network. Web service-based application systems mostly adopt dynamic service composition strategies. However, the complexity of the web service composition execution engine determines the uncertainty of its application system state. It is particularly important to recover from a fault state in a timely manner after discovering a system failure. This paper, by extending the traditional petri nets, proposed the concept of dynamic petri nets, defined the concept of similar atomic services, solved dynamic replacement of transition by using similarity atomic service, and given fault treatment policy based on dynamic petri nets in atomic service and subnet level. Finally, use specific examples of Web services application system to verify the effectiveness and feasibility of the proposed method.