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60 lines
2.0 KiB
60 lines
2.0 KiB
###################################################################################
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#
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# Copyright (C) 2018 MuK IT GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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###################################################################################
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import time
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import logging
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import datetime
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import functools
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_logger = logging.getLogger(__name__)
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#----------------------------------------------------------
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# Properties
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#----------------------------------------------------------
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class cached_property(object):
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def __init__(self, timeout=None):
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self.timeout = timeout
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def __call__(self, func):
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return functools.update_wrapper(self, func)
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def __get__(self, obj, cls):
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if obj is None:
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return self
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try:
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value, last_updated = obj.__dict__[self.__name__]
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except KeyError:
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pass
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else:
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if self.timeout is None:
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return value
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elif self.timeout >= time.time() - last_updated:
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return value
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value = self.__wrapped__(obj)
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obj.__dict__[self.__name__] = (value, time.time())
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return value
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def __delete__(self, obj):
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obj.__dict__.pop(self.__name__, None)
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def __set__(self, obj, value):
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obj.__dict__[self.__name__] = (value, time())
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