一种位置相关缓存有效性判别方法

A Method of Deciding Validation of Location-dependent Cache

在客户端缓存部分经常访问的数据,可以缩短数据的存取时间、提高系统性能。如果所缓存的数据是位置相关数据,那么,随着客户端位置的改变,所缓存的数据值可能变得无效了,因此,对所缓存数据值进行有效与否的判别至关重要。一种可行的方法是获得所缓存数据值的有效范围信息,在这种情况下,对有效范围信息的组织则是影响系统性能的关键,本文提出了一种新方法来构建有效范围信息,这种方法不仅大大减少了系统的开销,而且灵活性比较好。

Caching part frequently accessed data at client can short access time and improve performance. If the cached data are locationdependent data, then with the client changing its location, the cached data value may become invalid, so deciding the validation of the cached data is very important. One feasible way is to attain the information of the valid scope, in this case, the organization of the scope information is the key to system performance. This text proposes a method to build the scope information, our method not only reduces the system overhead, hut refines also the flexibility.