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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2011-2013 Codernity (http://codernity.com)
#
# 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.
import functools
from random import choice
def create_cache1lvl(lock_obj):
def cache1lvl(maxsize=100):
def decorating_function(user_function):
cache = {}
lock = lock_obj()
@functools.wraps(user_function)
def wrapper(key, *args, **kwargs):
try:
result = cache[key]
except KeyError:
with lock:
if len(cache) == maxsize:
for i in xrange(maxsize // 10 or 1):
del cache[choice(cache.keys())]
cache[key] = user_function(key, *args, **kwargs)
result = cache[key]
return result
def clear():
cache.clear()
def delete(key):
try:
del cache[key]
return True
except KeyError:
return False
wrapper.clear = clear
wrapper.cache = cache
wrapper.delete = delete
return wrapper
return decorating_function
return cache1lvl
def create_cache2lvl(lock_obj):
def cache2lvl(maxsize=100):
def decorating_function(user_function):
cache = {}
lock = lock_obj()
@functools.wraps(user_function)
def wrapper(*args, **kwargs):
try:
result = cache[args[0]][args[1]]
except KeyError:
with lock:
if wrapper.cache_size == maxsize:
to_delete = maxsize // 10 or 1
for i in xrange(to_delete):
key1 = choice(cache.keys())
key2 = choice(cache[key1].keys())
del cache[key1][key2]
if not cache[key1]:
del cache[key1]
wrapper.cache_size -= to_delete
result = user_function(*args, **kwargs)
try:
cache[args[0]][args[1]] = result
except KeyError:
cache[args[0]] = {args[1]: result}
wrapper.cache_size += 1
return result
def clear():
cache.clear()
wrapper.cache_size = 0
def delete(key, *args):
if args:
try:
del cache[key][args[0]]
if not cache[key]:
del cache[key]
wrapper.cache_size -= 1
return True
except KeyError:
return False
else:
try:
wrapper.cache_size -= len(cache[key])
del cache[key]
return True
except KeyError:
return False
wrapper.clear = clear
wrapper.cache = cache
wrapper.delete = delete
wrapper.cache_size = 0
return wrapper
return decorating_function
return cache2lvl