Apache本地緩存文件：基於hashlib緩存
1.文件內容如下，localcache.py
# -*- coding: utf-8 -*-
#
# Copyright(c) 2010 poweredsites.org
#
# 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 hashlib
from time import time
_mem_caches = {}
def mem_cache(expire=7200, key="", maxlen=100000,start=0):
"""Mem cache to python dict by key"""
def wrapper(func):
def mem_wrapped_func(*args, **kwargs):
now = time()
if key:
c = key
else:
c = repr(func)
k = key_gen(c, *args[start:], **kwargs)
value = _mem_caches.get(k, None)
if _valid_cache(value, now):
return value["value"]
else:
val = func(*args, **kwargs)
assert len(str(val))<=maxlen
_mem_caches[k] = {"value":val, "expire":now+expire}
return val
return mem_wrapped_func
return wrapper
def purge_mem():
global _mem_caches
count = len(_mem_caches)
_mem_caches = {}
return count
def key_gen(key, *args, **kwargs):
code = hashlib.md5()
code.update(str(key))
code.update("".join(sorted(map(str, args))))
code.update("".join(sorted(map(str, kwargs.iteritems()))))
return code.hexdigest()
def _valid_cache(value, now):
if value:
if value["expire"] > now:
return True
else:
return False
else:
return False
2.使用示例
(1) 緩存數據，在service/ebk5.py中：
from lib.localcache import mem_cache
class Ebk5BookService(object):
@mem_cache(7200,'',1000000000)
def
book_name_rel_id(self):
'''
書名與書籍ID映射關系
'''
bk_list = Ebk5Book.mgr(ismaster=True).raw("select bookName,ID from ebk5_book")
return {i.get("bookName").lstrip('《').rstrip('》'):i.get("ID") for i in bk_list if i}
(2) 調用緩存數據，在service/ebk5.py中：
class Ebk5BookService(object):
def get_id_by_name(self,name):
'''
根據書籍名稱獲取書籍ID
'''
book_id = 0
bk_rel_dict = self.
book_name_rel_id()
if bk_rel_dict.has_key(str(name)):
book_id = bk_rel_dict.get(str(name))
return book_id