First of all: Please use u...@commons.apache.org for questions regarding JCS.
On 04.01.12 18:12, Chopin hu wrote: > I have a program to download files from remote sites. Once downloaded a > data file, I use the URL as a key and put it to the cache so that I don't > have to download it again if the url is found to exist in the cache. > However, I found sometimes the caching would fail -- no caching is put to the > file system ( I am using Disk File Cache). the url is working fine for > downloading. After debugging, it turns out that the URL string is too long. > When the url string exceeds 256 characters, JCS won't accept it as a proper > key. > > So my questions are: > 1.) is a JCS cache key limited to 256 chars long? is there a way to > increase its length? > 2.) If can not get around the cache key length limitation, what could be the > possible ways to make a long URL string short enough but still unique enough > to serve as a key? I tried to use the last 256 characters from the url > string, but some query string is so long that it could not guarantee a key's > uniqueness. I guess the FileDiskCache is the issue here. The key of the item in FileDiskCache is directly used as a file name. So what you experience is a limit of file name length rather than key length. You should better use another disk cache implementation such as IndexedDiskCache which does not have such limits. Bye, Thomas. --------------------------------------------------------------------- To unsubscribe, e-mail: jcs-users-unsubscr...@jakarta.apache.org For additional commands, e-mail: jcs-users-h...@jakarta.apache.org
