/usr/lib/python2.7/dist-packages/cachetools/cache.py is in python-cachetools 2.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | from __future__ import absolute_import
from .abc import DefaultMapping
class _DefaultSize(object):
def __getitem__(self, _):
return 1
def __setitem__(self, _, value):
assert value == 1
def pop(self, _):
return 1
class Cache(DefaultMapping):
"""Mutable mapping to serve as a simple cache or cache base class."""
__size = _DefaultSize()
def __init__(self, maxsize, missing=None, getsizeof=None):
if missing:
self.__missing = missing
if getsizeof:
self.__getsizeof = getsizeof
self.__size = dict()
self.__data = dict()
self.__currsize = 0
self.__maxsize = maxsize
def __repr__(self):
return '%s(%r, maxsize=%r, currsize=%r)' % (
self.__class__.__name__,
list(self.__data.items()),
self.__maxsize,
self.__currsize,
)
def __getitem__(self, key):
try:
return self.__data[key]
except KeyError:
return self.__missing__(key)
def __setitem__(self, key, value):
maxsize = self.__maxsize
size = self.getsizeof(value)
if size > maxsize:
raise ValueError('value too large')
if key not in self.__data or self.__size[key] < size:
while self.__currsize + size > maxsize:
self.popitem()
if key in self.__data:
diffsize = size - self.__size[key]
else:
diffsize = size
self.__data[key] = value
self.__size[key] = size
self.__currsize += diffsize
def __delitem__(self, key):
size = self.__size.pop(key)
del self.__data[key]
self.__currsize -= size
def __contains__(self, key):
return key in self.__data
def __missing__(self, key):
value = self.__missing(key)
try:
self.__setitem__(key, value)
except ValueError:
pass # value too large
return value
def __iter__(self):
return iter(self.__data)
def __len__(self):
return len(self.__data)
@staticmethod
def __getsizeof(value):
return 1
@staticmethod
def __missing(key):
raise KeyError(key)
@property
def maxsize(self):
"""The maximum size of the cache."""
return self.__maxsize
@property
def currsize(self):
"""The current size of the cache."""
return self.__currsize
def getsizeof(self, value):
"""Return the size of a cache element's value."""
return self.__getsizeof(value)
|