Research On Event Processing Mechanism In Distributed Workflow

With the development of enterprise informationization, business processes in an enterprise are becoming more and more complicated. The existed workflow management systems have the disadvantages, such as, insufficient flexibility, limited integration ability and poor inter-operations in an enterprise. Therefore, researches on distributed workflow management systems are needed to be sensible for enterprise informationization.An event-driven distributed workflow management system introduces ECA (Event-Condition-Action) rules of active database into a distributed, heterogenous and dynamic environment to describe the task process of a workflow.Events are the unique mechanism of procedure integration and coordination.Rules are executed based on event triggers to accomplish tasks of a certain workflow automatically.This article summarizes the correlative concept about the distributed workflow technology and event process technology firstly, studies deeply about the research status and the disadvantage of workflow technology. And then this paper sums up the characteristic of distributed workflow management system from the event-driven distributed workflow management system, an event compositing algorithm based on region and extend Petri net(E-CPN), analyzing the performance of the E-CPN. Each step has been described and analyzed in detail. A delay-time algorithm based on simplified rules is given. By applying the rules continuously, the scale of the E-CPN can be reduced progressively so that the distributed workflow systematic response time can be calculated. Finally, the algorithm based on bucket is proposed, which can solve the order inconsistency problem in processing event in the region.