[Opensymphony-oscache] Dynamic Content Refresh

I am currently evaluating a possible usage of OSCache, and came across the following feature on the feature list:

* OSCache allows you to execute dynamic content periodically (eg every 30 minutes) rather than every request and store the result in memory. Each further request is served directly from the memory cache, resulting in dramatic speed increases.

I read this to say that instead of just invalidating the cached content and having it be re-retrieved upon next request, that OSCache can re-execute the process for me and cache the result.  This way, the user is no longer waiting for the request when the cache is invalidated.

However, I could not find any documentation on this feature.  How do I set it up to execute, and how can I configure it?

Thanks!
--John
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