mirror of
https://github.com/mail-in-a-box/mailinabox.git
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43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
#####
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##### This file is part of Mail-in-a-Box-LDAP which is released under the
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##### terms of the GNU Affero General Public License as published by the
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##### Free Software Foundation, either version 3 of the License, or (at
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##### your option) any later version. See file LICENSE or go to
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##### https://github.com/downtownallday/mailinabox-ldap for full license
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##### details.
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#####
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import datetime
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import threading
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#
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# thread-safe dict cache
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#
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class DictCache(object):
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def __init__(self, valid_for):
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'''`valid_for` must be a datetime.timedelta object indicating how long
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a cache item is valid
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'''
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self.obj = None
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self.time = None
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self.valid_for = valid_for
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self.guard = threading.Lock()
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def get(self):
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now = datetime.datetime.now()
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with self.guard:
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if self.obj and (now - self.time) <= self.valid_for:
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return self.obj.copy()
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def set(self, obj):
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with self.guard:
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self.obj = obj.copy()
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self.time = datetime.datetime.now()
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def reset(self):
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with self.guard:
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self.obj = None
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self.time = None
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