Java code patterns for Petri net based behavioral models

CNet is a component-based conception for graphically designing modular, concurrent, and distributed control systems based on Petri nets. CNet components can be considered an alternative to IEC 61499 functions blocks. The elements forming the components' interfaces are derived from a special class of colored Petri nets, called PNet. A mapping of these interface definitions to Java language constructs has been proposed and published. In this paper we present Java code patterns that implement the behavior of the PNet language elements. These code patterns allow the automatic code generation of CNet component descriptions preserving the event-discrete and concurrent character of the Petri net representation. The concepts are explained and demonstrated using CNet/PNet, but they may be generalized and applied to other design conceptions like IEC 61499 or UML activity diagrams.