Source Code for Package memtools.storages

 1  #!/usr/bin/env python 
 2  # -*- coding: utf-8 -*- 
 3  # 
 4  #       __init__.py 
 5  # 
 6  #       Copyright 2010 Pablo Alejandro Costesich <pcostesi@alu.itba.edu.ar> 
 7  # 
 8  #       Redistribution and use in source and binary forms, with or without 
 9  #       modification, are permitted provided that the following conditions are 
10  #       met: 
11  # 
12  #       * Redistributions of source code must retain the above copyright 
13  #         notice, this list of conditions and the following disclaimer. 
14  #       * Redistributions in binary form must reproduce the above 
15  #         copyright notice, this list of conditions and the following disclaimer 
16  #         in the documentation and/or other materials provided with the 
17  #         distribution. 
18  #       * Neither the name of the Dev Team nor the names of its 
19  #         contributors may be used to endorse or promote products derived from 
20  #         this software without specific prior written permission. 
21  # 
22  #       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
23  #       "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
24  #       LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
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33  # 
34   
35  """ 
36  Memory decorator and utilites to speed up access to computationally expensive 
37  functions. 
38  """ 
39   
40  import random, time 
41  from memtools.protocols import Memory 
42   
43   
44  # 
45  #   AUXILIARY CLASSES 
46  # 
47   
48   
49 -class NotSet(object): 
50      """ Empty class used to differenciate None from unsetted values in k-v 
51          storages that return None in both cases, like python-memcached. 
52      """ 
53      pass 
54   
55   
56 -class OutOfBounds(Exception): 
57      pass 
58   
59   
60 -class Alzheimer(Memory): 
61      '''This is a mock class. Forget it.''' 
62   
63 -    def __init__(self, disease=False, *args, **kwargs): 
64          self._client = {} 
65          if disease: 
66              t = Thread(target=self.__disease) 
67              t.start() 
68   
69 -    def __setitem__(self, key, value): 
70          self._client.__setitem__(key, value) 
71   
72 -    def __getitem__(self, key): 
73          return self._client.__getitem__(key) 
74   
75 -    def __delitem__(self, key): 
76          self._client.__delitem__(key) 
77   
78 -    def keys(self, string): 
79          a = [] 
80          for i in self._client.keys(): 
81              if i.startswith(string[:-1]): 
82                  a.append(i) 
83          return a 
84   
85 -    def __disease(self): 
86          while True: 
87              rand = random.uniform(1, 3600) 
88              time.sleep(rand) 
89              try: 
90                  del self._client[self._client.keys()[int(random.uniform(0, 
91                              len(self._client)))]] 
92              except: 
93                  pass 
94