关键词: 工作流, JBPM, 流程信息, 节点状态, 图示模型, 软件分层理论, 面向对象设计原则, 抽象工厂模式

Abstract:

General workflow information graphical representation models only show the current node status, and the graphical representation information is difficult to expand, so the users cannot fully grasp the progress of the process. When the process requires the users to participate in the selection, the users will feel difficult to select the appropriate next link or process. Furthermore, some weaknesses exist in the former model such as unclear design hierarchy, being difficult to maintain. Based on the above considerations, an improved model is put forward accompanied with an increase of peer node status and history node status compared with the original model, combined with the optimization of model design on the basis of the layered software theory, the objectoriented design principle and the abstract factory pattern of the software design theory. And a reflex mechanism is applied to the abstract factory pattern in the improved model. This new model greatly reduces the degree of coupling between the software layers. The improved model keeps the software structured, easytomaintain, and can respond effectively to requirement Changes. In addition, the graphical information can easily be added to the software without changing the overall structure of the program,which provides the users with rich information.Through practical applications, the key configuration and code implementation are displayed, and the graphical result is shown. The practical application shows that this model has greatly increased the development efficiency and provides rich graphical information, thus it meets the development needs and user requirements properly.

Key words: workflow；JBPM；process information；node status；graph presentation model；layered software theory；objectoriented design principle；abstract factory pattern