关键词: 使用控制, 优先级, 并发访问, 属性判断

Abstract: 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.
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Key words: UCON, priority, concurrent access, attribute judgment