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−#!/usr/bin/python2.5
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−#
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−# Copyright 2009 the Melange authors.
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−#
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−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
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−# You may obtain a copy of the License at
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−#
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−#   http://www.apache.org/licenses/LICENSE-2.0
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−#
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−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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−# See the License for the specific language governing permissions and
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−# limitations under the License.
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−
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−"""Module contains sidebar memcaching functions.
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−"""
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−
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−__authors__ = [
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−    '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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−  ]
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−
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−
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−from google.appengine.api import memcache
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−from google.appengine.api import users
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−
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−import soc.cache.base
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−import soc.cache.rights
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−
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−
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−def key(id):
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−  """Returns the memcache key for the user's sidebar.
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−  """
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−
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−  return 'sidebar_for_%s' % repr(id)
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−
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−
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−def get(id, *args, **kwargs):
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−  """Retrieves the sidebar for the specified user from the memcache.
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−  """
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−
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−  memcache_key = key(id)
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−  return memcache.get(memcache_key), memcache_key
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−
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−
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−def put(sidebar, memcache_key, *args, **kwargs):
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−  """Sets the sidebar for the specified user in the memcache.
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−
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−  Args:
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−    sidebar: the sidebar to be cached
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−  """
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−
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−  # Store sidebar for just three minutes to force a refresh every so often
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−  retention = 3*60
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−
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−  memcache.add(memcache_key, sidebar, retention)
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−
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−
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−def flush(id=None):
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−  """Removes the sidebar for the current user from the memcache.
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−
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−  Also calls soc.cache.rights.flush for the specified user.
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−
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−  Args:
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−    id: defaults to the current account if not set
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−  """
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−
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−  if not id:
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−    id = users.get_current_user()
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−
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−  memcache_key = key(id)
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−  memcache.delete(memcache_key)
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−  soc.cache.rights.flush(id)
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−
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−
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−# define the cache function
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−cache = soc.cache.base.getCacher(get, put)