实时协同设计并发控制机制研究

为了解决协同设计中数据量大、事务长、多层嵌套的问题,建立了一种新的协同设计并发控制模型。根据数据要求生成复制事务,事务发生改变后,其他站点能够实时显示图形、实时读取数据。通过计算数据传输的最小延时确定操作权管理者,提高了协同设计的实时性。提出了基于事务语义的并发控制策略,分析了并发控制机制中事务结构、事务提交、锁机制和冲突协调等关键性问题。实例证明,并发控制策略保证协同用户自由地操作共享资源,提高了并发控制的可靠性和数据的一致性。

Research on Concurrency Control Mechanism for Real Time Collaborative Design

To solve such problems as large volume of data,long-term transaction process and nested layer in computer aided collaborative design process,a new concurrency model of collaborative design was established.According to data requirements to replicate contents,other stations can read the data and show the graph when the data are changed.The method of data transmit minimum postpone time was proposed.By computing minimum transmit time,the manipulation right manager is decided and property of real time collaborative design is enhanced.The relationships among structure,transaction submission,the inter-lock mechanism and conflict harmonization were discussed.It was verified that the concurrency control strategy not only enabled the collaborative users handle shared resources freely but also ensured the agility concurrency control and the consistency of real-time data by an application example.