Concurrency control method of replicated system cooperative cad

The present invention discloses a concurrency control method of replicated collaborative CAD system, the method by constructing a tree topology element, the element tree based topology recorded date on the boundary element model of the topology, the topology elements are split, merged, and deleted history and led to the topology element is deleted set of operations. By citation analysis intention of obtaining topological elements and topology state elements and element tree topology change history recorded in the CAD environment can achieve synergies to maintain consistency and proper execution of the operation of the collaborative system modeling concurrent operating conditions. The present invention as compared with the prior art, and obvious positive effects: First, the present method ensures the greatest extent possible the execution boundary shape model based on the current operation; at the same time, the present process is carried out in a multi-user collaborative editing environment, each maintained collaborative sites on the consistency of boundary model in the case of concurrent operations.