Do not rely on notifiction module being imported
This has worked so far mostly by accident, but it turned out to be
brittle while writing tests. This makes sure that the notification
module is always imported before use.
#!/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 containing some basic caching functions.
"""
__authors__ = [
'"Sverre Rabbelier" <sverre@rabbelier.nl>',
]
from functools import wraps
def getCacher(get, put):
"""Returns a caching decorator that uses get and put.
"""
# TODO(SRabbelier) possibly accept 'key' instead, and define
# get and put in terms of key, depends on further usage
def cache(func):
"""Decorator that caches the result from func.
"""
@wraps(func)
def wrapper(*args, **kwargs):
"""Decorator wrapper method.
"""
result, key = get(*args, **kwargs)
if result:
return result
result = func(*args, **kwargs)
if key:
put(result, key, *args, **kwargs)
return result
return wrapper
return cache