forked from ScoDoc/ScoDoc
82 lines
2.3 KiB
Python
82 lines
2.3 KiB
Python
# -*- mode: python -*-
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# -*- coding: utf-8 -*-
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##############################################################################
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#
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# Gestion scolarite IUT
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#
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# Copyright (c) 1999 - 2021 Emmanuel Viennet. All rights reserved.
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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 General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Emmanuel Viennet emmanuel.viennet@viennet.net
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#
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##############################################################################
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"""Cache simple par etudiant
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"""
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import time
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# Cache data
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class simpleCache(object):
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def __init__(self):
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self.cache = {}
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self.inval_cache() # >
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def inval_cache(self, key=None): # >
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if key:
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if key in self.cache:
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del self.cache[key]
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else:
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# clear all entries
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self.cache = {} # key : data
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def set(self, key, data):
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self.cache[key] = data
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def get(self, key):
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"""returns None if not in cache"""
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return self.cache.get(key, None)
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class expiringCache(simpleCache):
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"""A simple cache wich cache data for a most "duration" seconds.
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This is used for users (which may be updated from external
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information systems)
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"""
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def __init__(self, max_validity=60):
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simpleCache.__init__(self)
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self.max_validity = max_validity
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def set(self, key, data):
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simpleCache.set(self, key, (data, time.time()))
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def get(self, key):
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info = simpleCache.get(self, key)
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if info:
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data, t = info
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if time.time() - t < self.max_validity:
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return data
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else:
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# expired
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self.inval_cache(key) # >
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return None
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else:
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return None # not in cache
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