Research on Collaborative Composite Operation Causal Consistency in Activity Diagram Environment

1Activity diagram is a model view to describe the behavior of the system, has a wide range of applications. Therefore, the research of collaborative activity diagram editing system has a great significance. The paper defines the object of activity diagram and builds the model of diagram theory. Firstly, we analysis the general operation and composite operation in collaborative activity diagram. Then we analysis several conflicts with the CB_ObjSet(basic activity diagram object of composite operation) and the HB in local operation queue, such as Group-Ungroup conflict, Ungroup-Ungroup conflict, Update-Update conflict, Update-Delete conflict and Delete-Delete conflict. We use several methods (such as role operation privilege, collaborative text edit and multi-version) to handle different conflicts. Through these methods, we solved conflicts that have dependence relation. At last, an example given to prove the effectiveness of the new strategy.