Adds to Melange a tags framework based on taggable-mixin.
The taggable-mixin allowed only tag per Datastore model. This is extended
framework allows any arbitrary number of tags per Datastore model. Also,
now one can define different models for different Tag types which are all
inherited from the base Tag model provided by taggable-mixin.
The GHOPTask model makes use of 2 tags per model, one for difficulty and the
other for task_type, both using the tags framework.
Reviewed by: Paweł Sołyga
#!/usr/bin/python2.5
#
# Copyright 2009 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Module contains sidebar memcaching functions.
"""
__authors__ = [
'"Sverre Rabbelier" <sverre@rabbelier.nl>',
]
from google.appengine.api import memcache
import soc.cache.base
import soc.cache.rights
import soc.logic.accounts
def key(id):
"""Returns the memcache key for the user's sidebar.
"""
return 'sidebar_for_%s' % repr(id)
def get(id, *args, **kwargs):
"""Retrieves the sidebar for the specified user from the memcache.
"""
memcache_key = key(id)
# pylint: disable-msg=E1101
return memcache.get(memcache_key), memcache_key
def put(sidebar, memcache_key, *args, **kwargs):
"""Sets the sidebar for the specified user in the memcache.
Args:
sidebar: the sidebar to be cached
"""
# Store sidebar for just three minutes to force a refresh every so often
retention = 3*60
# pylint: disable-msg=E1101
memcache.add(memcache_key, sidebar, retention)
def flush(id=None):
"""Removes the sidebar for the current user from the memcache.
Also calls soc.cache.rights.flush for the specified user.
Args:
id: defaults to the current account if not set
"""
if not id:
id = soc.logic.accounts.getCurrentAccount()
memcache_key = key(id)
# pylint: disable-msg=E1101
memcache.delete(memcache_key)
soc.cache.rights.flush(id)
# define the cache function
cache = soc.cache.base.getCacher(get, put)