54 lines
1.1 KiB
Python
Executable File
54 lines
1.1 KiB
Python
Executable File
# !/usr/bin/env python
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#
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# ObjectsCache is a Objects cache
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# the Object has to have a method "get_size" to tell
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# the cacher counting the objects size
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class ObjectCache(dict) :
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def __init__(self,maxsize=10000000,*args) :
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super(ObjectsCache,self).__init__(*args)
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self.maxsize = maxsize
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self.size = 0
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self._shadow = {}
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def __setitem__(self,key,item) :
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try :
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size = item.get_size()
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self.size += size
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except :
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return
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if self.size >= self.maxsize :
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tmp = [(t,key) for key,(t,size) in self._shadow.iteritems() ]
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tmp.sort()
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for i in xrange(len(tmp)//2) :
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del self[tmp[i][i]]
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del tmp
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super(ObjectCache,self).__setitem__(key,item)
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self._shadow[key] = [time.time(),size]
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def __getitem__(self,key) :
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try :
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item = super(ObjectCache,self).__getitem__(key)
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except :
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raise
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else :
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self._shadow[key][0] = time.time()
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return item
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def get(self,key,default=None) :
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if self.has_key(key) :
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return self[key]
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else :
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return default
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def __delitem__(self,key) :
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try :
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super(ObjectCache,self).__delitem__(key)
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except :
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raise
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else :
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self.size -= self._shadow[key][1]
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del self._shadow[key]
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