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###################################################################################
#
# Copyright (c) 2017-2019 MuK IT GmbH.
#
# This file is part of MuK Utils
# (see https://mukit.at).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
###################################################################################
import time
import logging
import datetime
import functools
_logger = logging.getLogger(__name__)
#----------------------------------------------------------
# Properties
#----------------------------------------------------------
class cached_property(object):
def __init__(self, timeout=None):
self.timeout = timeout
def __call__(self, func):
return functools.update_wrapper(self, func)
def __get__(self, obj, cls):
if obj is None:
return self
try:
value, last_updated = obj.__dict__[self.__name__]
except KeyError:
pass
else:
if self.timeout is None:
return value
elif self.timeout >= time.time() - last_updated:
return value
value = self.__wrapped__(obj)
obj.__dict__[self.__name__] = (value, time.time())
return value
def __delete__(self, obj):
obj.__dict__.pop(self.__name__, None)
def __set__(self, obj, value):
obj.__dict__[self.__name__] = (value, time())