基于建模历史一致性的协同CAD并发控制方法  

Collaborative CAD concurrency control method based on consistency of modeling history

作　　者：张德军[1] 何发智[1] 

机构地区：[1]武汉大学计算机学院,武汉430072

出　　处：《东南大学学报（自然科学版）》2015年第5期828-833,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61472289);湖北省自然科学基金资助项目(2015CFB254)

摘　　要：为了解决CAD系统在线集成中的建模历史不一致问题,提出了一种基于建模历史一致性的协同CAD并发控制方法.首先,对协同CAD建模操作间的关系进行了详细分析.然后,构造了一种考虑建模历史的并发控制模型,该模型通过状态向量实现建模操作间的因果关系维护,通过重构操作历史来解决建模操作间的偏并发关系,并将存在并发关系的建模操作分为互换、屏蔽和互斥3类分别进行处理.最后,设计了一种支持建模历史一致性的协同CAD并发控制方法,本地站点产生的操作立即执行,远程站点调用并发控制模型中的处理机制以完成远程操作的并发控制.实验结果表明,在协同CAD环境中,所提方法为用户提供了自由并发交互协同工作的同时,能够维护各协同站点建模历史的一致性.To avoid the inconsistency of modeling history in the online integration of computer aided design （CAD） systems, a collaborative CAD concurrency control method base on the consistency of modeling history is proposed. First, the relationship between CAD modeling operations is analyzed. Then, a concurrency control model based on modeling history is constructed. In this model, the causality maintenance between modeling operations is achieved by state vectors. The partial concurrent relations between modeling operations are solved by refactoring operation history. The modeling operations with the concurrent relationship are divided into commute, mask and mutex and processed separately. Finally, a collaborative CAD concurrency control method which supports the consistency of modeling history is designed. The operation generated by the local site is executed immediately and the remote site calls the mechanisms of the concurrency control model to implement concurrency control of remote operations. The experimental results demonstrate that the proposed method can not only provide reasonably free and concurrent interaction in collaborative CAD environment, but also maintain the consistency of modeling history for each collaborative site.

关 键 词：协同CAD系统 建模历史 状态向量 偏并发 并发控制 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]