[Opensymphony-oscache] Persistence to Database ?

Hello,
   My Application needs an In Memeory Caching. Along with that when ever cache reaches a limit then data in the cache needs to be written to database.
How can I achieve this ?
        
   In OSCache API, I saw API   com.opensymphony.oscache.base.persistence .PersistenceListener. But I don't see any other supporting classes.  Do I have to write my ownn JDBC classes for this? But How do I write? What is the format that JDBC classes should be ? and How do I plugin with OSCache classes to work.

Can anybody throw light on this ?

Thanks
Kishore

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