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# $Id: CacheRegion.py,v 1.1 2006/12/18 23:06:54 dwelch Exp $
"""Cache holder classes for Cheetah:
Cache regions are defined using the #cache Cheetah directive. Each
cache region can be viewed as a dictionnary (keyed by cacheID)
handling at least one cache (the default one). It's possible to add
caches in a region by using the `varyBy` #cache directive parameter as
in the following example::
#cache varyBy=$getArticleID()
#def getArticle
this is the article content.
#end def
#end cache
The code above will generate a CacheRegion, and depending on the
article id value, add some new sub-caches ad-hoc.
Meta-Data
================================================================================
Author: Philippe Normand <phil@base-art.net>
Version: $Revision: 1.1 $
Start Date: 2005/06/20
Last Revision Date: $Date: 2006/12/18 23:06:54 $
"""
__author__ = "Philippe Normand <phil@base-art.net>"
__revision__ = "$Revision: 1.1 $"[11:-2]
import md5
class CacheRegion:
""" A `CacheRegion` stores some `Cache` instances.
"""
def __init__(self):
self.clear()
def clear(self):
" drop all the caches stored in this cache region "
self.caches = {}
def getCache(self, cacheID):
""" Lazy access to a cache
Try to find a cache in the stored caches. If it doesn't
exist, it's created.
Returns a `Cache` instance.
"""
cacheID = md5.new(str(cacheID)).hexdigest()
if not self.caches.has_key(cacheID):
cache = Cache(cacheID)
self.caches[cacheID] = cache
return self.caches.get(cacheID)
class Cache:
""" Cache class.
A Cache is a container storing:
- cacheID (string)
- refreshTime (timestamp or None) : last time the cache was refreshed
- data (string) : the content of the cache
"""
def __init__(self, cacheID):
self.setID(cacheID)
self.clear()
def clear(self):
self.setData("")
self.setRefreshTime(None)
def getID(self):
return self.cacheID
def setID(self, cacheID):
self.cacheID = cacheID
def setData(self, data):
self.data = data
def getData(self):
return self.data
def setRefreshTime(self, time):
self.refreshTime = time
def getRefreshTime(self):
return self.refreshTime
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