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###################################################################################
#
# Copyright (C) 2018 MuK IT GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
###################################################################################
import time
class memoize(object):
_caches = {}
_timeouts = {}
def __init__(self, timeout=2):
self.timeout = timeout
def collect(self):
for func in self._caches:
cleaned_cache = {}
current_time = time.time()
for key in self._caches[func]:
if (current_time - self._caches[func][key][1]) < self._timeouts[func]:
cleaned_cache[key] = self._caches[func][key]
self._caches[func] = cleaned_cache
def __call__(self, func):
self.cache = self._caches[func] = {}
self._timeouts[func] = self.timeout
def wrapper(*args, **kwargs):
current_time = time.time()
kw = sorted(kwargs.items())
key = (args, tuple(kw))
try:
value = self.cache[key]
if (current_time - value[1]) > self.timeout:
raise KeyError
except KeyError:
value = self.cache[key] = (func(*args,**kwargs), current_time)
return value[0]
wrapper.func_name = func.__name__
return wrapper