使用控制系统中的并发优先控制研究

摘要

There are two important characteristics in usage control:mutability of attributes and access decision continuity.In order to ensure data consistency,when a lot of subjects access to and change the attributes of one object at the same time,only one subject has the right to change the properties of the object.However,there is one problem exist,that is,who comes first as many subjects apply to change the properties of the object.Aiming at the question,the paper proposes a strategy,which brings sequential access when multiple subjects' concurrent access to object and it meets the needs of customers.%使用控制有两个重要的特征:属性的可变性和访问决策的连续性,在多个主体同时访问客体并改变客体的属性时,为保证数据的一致性,要求同一时间只能有一个主体能够改变客体的属性,然而,当主体同时申请访问时存在优先权的问题.本文针对这一问题提出一种策略,使得在多个主体并发访问时,能够进行有依据的顺序访问,从而满足客户的需求.