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Cache holder classes for Cheetah:
Cache regions are defined using the #cache Cheetah directive. Each
cache region can be viewed as a dictionary (keyed by cacheRegionID)
handling at least one cache item (the default one). It's possible to add
cacheItems in a region by using the `varyBy` #cache directive parameter as
in the following example::
#def getArticle
this is the article content.
#end def
#cache varyBy=$getArticleID()
$getArticle($getArticleID())
#end cache
The code above will generate a CacheRegion and add new cacheItem for each value
of $getArticleID().
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A CacheItem is a container storing:
- cacheID (string)
- refreshTime (timestamp or None) : last time the cache was refreshed
- data (string) : the content of the cache
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A `CacheRegion` stores some `CacheItem` instances.
This implementation stores the data in the memory of the current process.
If you need a more advanced data store, create a cacheStore class that works
with Cheetah's CacheStore protocol and provide it as the cacheStore argument
to __init__. For example you could use
Cheetah.CacheStore.MemcachedCacheStore, a wrapper around the Python
memcached API (http://www.danga.com/memcached).
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