基于角色权限的CVE并发控制策略研究

Research on Concurrency Control Scheme of CVE Based on Role-privilege

在虚拟协同环境中,必然存在多个用户对共享对象进行并发访问,冲突不可避免。现有系统所采用的锁定机制,要求用户在对物体修改之前先进行锁定,造成多个用户始终处于等待状态而不能对共享对象施加有效操作,从而影响系统的执行效率。针对目前并发控制策略的这一缺陷,本文归纳了虚拟协同环境中并发控制策略的通用设计准则,引入了角色权限机制,在传统锁定机制基础上,提出了一种基于角色权限的虚拟协同环境并发控制策略。这个策略在一定程度上保证了虚拟协同环境的一致性,有效地改善和优化了系统性能。

Many users access the shared object at the same time in the collaborative virtual environment,so the conflict can't be avoided.In the existed system,locked mechanism is adopted.It requires the shared object be locked before updated.So many users have to wait for a long time for the updating privilege and the efficiency of the system is low.According to this,several design considerations of concurrency control of CVE is proposed and role-privilege theories are also adopted.Furthermore,a new role based on concurrency control scheme of CVE is introduced.This scheme can achieve the consistency of the virtual environment and optimize the system performance.