/usr/lib/python2.7/dist-packages/archmod/Cached.py is in archmage 1:0.3.1-3.
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 | # -*- coding: utf-8 -*-
#
# archmage -- CHM decompressor
# Copyright (c) 2009 Basil Shubin <bashu@users.sourceforge.net>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
# Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
class Cached(object):
"""Provides caching storage for data access decoration.
Usage:
class CachedClass(Cached):
def _getitem(self, name):
# implement data getting routine, such as db access
CachedClass().attribute1 # returns value as if _getitem('attribute1') was called
CachedClass().attribute2 # returns value as if _getitem('attribute2') was called
CachedClass().__doc__ # returns real docstring
"""
def __new__(classtype, *args, **kwargs):
__instance = object.__new__(classtype, *args, **kwargs)
__instance.cache = {}
return __instance
# to be implemented by contract in the descendant classes
def _getitem(self, name):
raise Exception(NotImplemented)
def __getattribute__(self, name):
try:
return object.__getattribute__(self, name)
except:
if not self.cache.has_key(name):
self.cache[name] = self._getitem(name)
return self.cache[name]
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