To Construct Workflow Management System Modeled By Restricted Digraph

Workflow Technology is a research hotspot in computer application domain. It is the core technology which actualizes enterprise business process modeling , emulational optimization analysis, process management and integration, finally to achieve the automatization of business process.It has been widely used in OA, BPR and other fields. Workflow Technology is often integrated with other application system to build different business management system which can meet the needs of different enterprise. Therefore , studying deeply and developing Workflow Technology have a great significance in promoting EBR, the normalization and informatization of enterprise management , and also in improving the economic effectiveness of Enterprise.Workflow Model is the abstract expression of business flow in computers. Whether Workflow Model is excellent or not has a direct effect on the executing performance of WfMS. To model Workflow is the key step to build WfMS. The method to model Workflow is the basis of theory research and the practical application of WfMS. It is the primary key problem of the research of Workflow Technology.Firstly in this paper , the basic concepts and definitions are presented and then give a introduce and compare of modeling methods used traditionally. These methods fall short of business process describing and its flexibility. Aiming at such questions, A method to model Workflow based on Digraph is put forward in the paper, the method can solve the shortage of describing ability in business process modeling of the Digrah by restricting the nodes and arcs , at the same time, the flexibility and intuitionistic is kept.The whole model is composed of Organization Model, Process Model and Data Model. The formal definition , components elements and relations ofthem are described explicitly. The model has been carried out by using OOP. The RBAC model used in Organization Model is improved that it can make up the deficiency on small granular information control and the time restrict of privilege. The data of WfMS is classified and depicted in Data Model. For the main data carrier of WfMS—Form, Form Template is designed , through the definition of which, the Form can be generated automaticly, and the improved RBAC Model is used to give access control on the Form.The following jobs are also done in the paper on the basis of giving and designing the modeling method.The RDBS-based Workflow Engine is designed based on the modeling method , the component modules and the main control algorithms are also presented .Aiming at the WfMS's feature of distributed structure , A deployed architecture of J2EE-based WfMS construction is put forward .The modeling circumstance is developed and the relevant modeling example is also provided , the modeling circumstance is also designed to support the generation of XPDL-based Workflow model .Lastly, A summary of the paper is given , pointing out some defects and previews on the following job.