Package pype32 :: Module caching
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Source Code for Module pype32.caching

 1  #!/usr/bin/env python 
 2  # -*- coding: utf-8 -*-  
 3   
 4  # Copyright (c) 2015, Sandor Nemes 
 5  # All rights reserved. 
 6  # 
 7  # Redistribution and use in source and binary forms, with or without 
 8  # modification, are permitted provided that the following conditions are met: 
 9  # 
10  #     * Redistributions of source code must retain the above copyright notice, 
11  #       this list of conditions and the following disclaimer. 
12  #     * Redistributions in binary form must reproduce the above copyright 
13  #       notice,this list of conditions and the following disclaimer in the 
14  #       documentation and/or other materials provided with the distribution. 
15  #     * Neither the name of the copyright holder nor the names of its 
16  #       contributors may be used to endorse or promote products derived from 
17  #       this software without specific prior written permission. 
18  # 
19  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
20  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
21  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
22  # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
23  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
24  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
25  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
26  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
27  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
28  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
29  # POSSIBILITY OF SUCH DAMAGE. 
30   
31  caches = {} 
32   
33 -class Cache(object):
34
35 - def __init__(self, name):
36 self.name = name 37 self.cache = {}
38
39 - def get(self, key):
40 return self.cache.get(key)
41
42 - def put(self, key, value):
43 self.cache.update({ key: value })
44
45 -def getCache(name):
46 cache = caches.get(name) 47 if cache is None: 48 cache = Cache(name) 49 caches[name] = cache 50 return cache
51
52 -def cached(*ids):
53 def decorator(func): 54 def decorated(self, *args): 55 funcname = "#".join([func.__name__] + [str(_) for _ in ids]) 56 cache = getCache(funcname) 57 key = hash(args) 58 result = cache.get(key) 59 if result is None: 60 result = func(self, *args) 61 cache.put(key, result) 62 return result
63 return decorated 64 return decorator 65