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##############################################################################
#
# Copyright (c) 2000-2008 Jens Vagelpohl and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
""" A simple non-persistent user object cache
$Id: SimpleCache.py 1485 2008-06-04 16:08:38Z jens $
"""
import time
class SimpleCache:
""" A simple non-persistent cache for user objects """
def __init__(self):
""" Initialize a new instance """
self.cache = {}
self.timeout = 600
def set(self, id, object):
""" Cache an object under the given id """
id = id.lower()
self.cache[id] = object
def get(self, id, password=None):
""" Retrieve a cached object if it is valid """
try:
id = id.lower()
except AttributeError:
return None
user = self.cache.get(id, None)
if ( password is not None and
user is not None and
password != user._getPassword() ):
user = None
if ( user and
(time.time() < user.getCreationTime().timeTime() + self.timeout) ):
return user
else:
return None
def getCache(self):
""" Get valid cache records """
valid = []
cached = self.cache.values()
now = time.time()
for object in cached:
created = object.getCreationTime().timeTime()
if object and now < (created + self.timeout):
valid.append(object)
return valid
def remove(self, id):
""" Purge a record out of the cache """
id = id.lower()
if self.cache.has_key(id):
del self.cache[id]
def clear(self):
""" Clear the internal caches """
self.cache = {}
def setTimeout(self, timeout):
""" Set the timeout (in seconds) for cached entries """
self.timeout = timeout
class SharedObject:
""" An even simpler class meant to be used as a cache for non-user-type
objects """
def __init__(self):
self.values = {}
def set(self, name, value):
self.values[name] = value
def get(self, name):
return self.values.get(name)
def clear(self, name=None):
if name:
try:
del self.values[name]
except (KeyError, IndexError):
pass
else:
self.values = {}
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