JCS磁盘缓存问题

Question

我正在使用JCS进行缓存，我遇到的问题是数据没有写入磁盘，即没有错误发生，但是当我查看数据文件时，它们都是0k大小。任何人都知道是什么导致的这个错误，我使用的是JCS网站提供的属性文件。

Answer 1

One of the cacheattributes is DiskUsagePatternName. The value can either be SWAP or UPDATE. SWAP is the default. UPDATE writes the cache data to disk right away.

In your cache.ccf add a line for

jcs.region.[yourregionid].cacheattributes.DiskUsagePatternName=UPDATE

That way it will write to disk without needing to shutdown the cache and you can still get the benefits of the memory cache.

The disk cache only writes the data when the cache object is disposed. In a web application I had to explicily call dispose() in the destroy() method of my servlet. If you don't call dispose() and don't have have the disk usage pattern set to UPDATE it won't write to disk.

Answer 2

Do you know its an error? Perhaps it only writes to disk when the cache is over some limit. ie it only writes when it has to.

Using Madhu's solution: When jcs.default.cacheattributes.MaxObjects=0 the file size will always be 0. Remove this and you can see data in the files.