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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2016, Ilya Etingof <ilya@glas.net>
# License: http://pysnmp.sf.net/license.html
#
# Limited-size dictionary-like class to use for caches
#
class Cache:
def __init__(self, maxSize=256):
self.__maxSize = maxSize
self.__size = 0
self.__chopSize = maxSize // 10
self.__chopSize = self.__chopSize and self.__chopSize or 1
self.__cache = {}
self.__usage = {}
def __contains__(self, k):
return k in self.__cache
def __getitem__(self, k):
self.__usage[k] += 1
return self.__cache[k]
def __len__(self):
return self.__size
def __setitem__(self, k, v):
if self.__size >= self.__maxSize:
usageKeys = sorted(self.__usage, key=lambda x, d=self.__usage: d[x])
for _k in usageKeys[:self.__chopSize]:
del self.__cache[_k]
del self.__usage[_k]
self.__size -= self.__chopSize
if k not in self.__cache:
self.__size += 1
self.__usage[k] = 0
self.__cache[k] = v
def __delitem__(self, k):
del self.__cache[k]
del self.__usage[k]
self.__size -= 1
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