[Opensymphony-oscache] OSCache: how to know whether a page will expire when a request comes?

Hi,

[b]Background[/b]:
In my project, I use OSCache to cache the homepage, which read much data from database. While I'm afraid the cache only creates a cached page; and each time the database reading still happens. 

[b]Question[/b]:
Is it possible: for each http request, I get some flag to know whether this time the cached page will expire and be replaced; only if it's true, will I read the database.

Thanks and kind regards,
Said
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