Need help for Cache Plugin

[ChangCheng]

Hi guys:I am trying to write a plugin that support to record url for each 
cacheable object when the object be cached, there is no content for cache 
plugin in API Guide, so i would like to get some help from here, Any suggestion 
for this problem? Thanks!Anyway, i konw there is someway can see the cacheable 
object, but for my porject specific request, i have to write a plug in for this 
thing! Thanks