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https://issues.apache.org/jira/browse/JCS-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672714#action_12672714
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Aaron Smuts commented on JCS-47:
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I'll update the docs. The colon is the only special character. You can use
it for partial key removal. You can use it in a key, but not at the end.
You should use as small of a key as possible to save on memory.
I almost never use object keys. Why bother? Simple strings are easy to work
with.
With the latest builds, there is a new API method called getMatching( String
pattern ). This will return all objects in the regions with a matching key.
You have to use string keys to take advantage of this method.
Aaron
> How to build an element key
> ---------------------------
>
> Key: JCS-47
> URL: https://issues.apache.org/jira/browse/JCS-47
> Project: JCS
> Issue Type: Question
> Components: Documentation
> Affects Versions: jcs-1.3
> Reporter: Ronny Roeller
> Assignee: Aaron Smuts
>
> I use a string as key for my elements. Now I was surprised to get this error
> message:
> 11:07:52,257 INFO [CacheEventQueue] Cache event queue created:
> CacheEventQueue [listenerId=1501085802, cacheName=cache]
> 11:07:53,000 INFO [STDOUT] org.apache.jcs.access.exception.CacheException:
> key must not end with : for a put operation
> I guess this means that colon is a special character, and can't be freely
> used as a key.
> Unfortunately, I couldn't find any documentation on the project website what
> the constrains are for keys. It would also be interested to know if there is
> anything else to be considered when choosing the key, e.g. is there an
> advantage in using shorter keys?
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