基于网络技术的实时协同设计并发控制策略研究

The Concurrent Control Strategy for Real-time Collaborative Design Based on Network Technology

为了解决计算机辅助协同设计中重启动频繁、死锁等问题,建立了一种实时协同设计并发控制模型。针对协同设计中数据量大、事务长、多层嵌套的特点,采用操作优先权模糊控制策略。通过图形对象全局ID和实体属性表的一致性维护,系统能够根据运行情况和用户需求自动进行操作优先权控制策略的调整。建立了并发控制机制中事务结构、事务提交、锁机制和冲突协调的联系,事务发生改变后其它站点能够实时显示、实时读取有效数据。实例证明,并发控制策略不仅让协同用户自由地操作共享资源,还能够保证具有高并发率和数据的实时一致性。

To solve such problems as dead-lock and frequent restart of computer in collaborative design process, an concurrency control model of real-time collaborative design was established. As collaborative design is characterized by large volume of data, long-term transaction process and nested layer, the fuzzy control strategy based on operational priorities was adopted. By maintaining the consistence of the global graphical ID and entity attributes list, the operational priorities can be adjusted automatically according to run-time conditions and user needs by the system. The relationships among transaction structure, transaction submission, inter-lock mechanism and conflict harmonization were established, and the valid real-time data can be displayed and read at other sites after the transaction status changes. It was verified that the concurrent control strategy not only enables the collaborative users handle shared resources freely but also ensures the high concurrent rate and the consistency of real-time data by an application example.