/usr/share/pyshared/zope/cachedescriptors/method.py is in python-zope.cachedescriptors 3.5.1-2.
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# Copyright (c) 2007 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
##############################################################################
"""Cached Methods
$Id: method.py 79733 2007-09-18 09:36:00Z zagy $
"""
class cachedIn(object):
"""Cached method with given cache attribute."""
def __init__(self, attribute_name, factory=dict):
self.attribute_name = attribute_name
self.factory = factory
def __call__(self, func):
def decorated(instance, *args, **kwargs):
cache = self.cache(instance)
key = self._get_cache_key(*args, **kwargs)
try:
v = cache[key]
except KeyError:
v = cache[key] = func(instance, *args, **kwargs)
return v
decorated.invalidate = self.invalidate
return decorated
def invalidate(self, instance, *args, **kwargs):
cache = self.cache(instance)
key = self._get_cache_key(*args, **kwargs)
try:
del cache[key]
except KeyError:
pass
def cache(self, instance):
try:
cache = getattr(instance, self.attribute_name)
except AttributeError:
cache = self.factory()
setattr(instance, self.attribute_name, cache)
return cache
@staticmethod
def _get_cache_key(*args, **kwargs):
kw = kwargs.items()
kw.sort()
key = (args, tuple(kw))
return key
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