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annotate src/memory/persistent.py @ 576:a60dd719e048

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misc: added presentation website to README
author Goffi <goffi@goffi.org>
date Wed, 09 Jan 2013 01:20:52 +0100
parents ca13633d3b6b
children 9902ec2d8d9b
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 SAT: a jabber client
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6 Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org)
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7
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8 This program is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU Affero General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU Affero General Public License for more details.
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17
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18 You should have received a copy of the GNU Affero General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """
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21
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22 from logging import debug, info, warning, error
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23
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24 class MemoryNotInitializedError(Exception):
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25 pass
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26
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27 class PersistentDict:
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28 """A dictionary which save persistently each value assigned
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29 /!\ be careful, each assignment means a database write
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30 /!\ Memory must be initialised before loading/setting value with instances of this class"""
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31 storage = None
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32
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33 def __init__(self, namespace, profile=None):
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34 """@param namespace: unique namespace for this dictionary
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35 @param profile: profile which *MUST* exists, or None for general values"""
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36 if not self.storage:
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37 error(_("PersistentDict can't be used before memory initialisation"));
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38 raise MemoryNotInitializedError
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39 self._cache = {}
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40 self.namespace = namespace
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41 self.profile = profile
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42
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43 def load(self):
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44 """load persistent data from storage
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45 """
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46 if not self.profile:
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47 return self.storage.loadGenPrivates(self._cache, self.namespace)
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48 else:
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49 return self.storage.loadIndPrivates(self._cache, self.namespace, self.profile)
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50
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51 def __repr__(self):
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52 return self._cache.__repr__()
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53
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54 def __str__(self):
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55 return self._cache.__str__()
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56
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57 def __lt__(self, other):
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58 return self._cache.__lt__(other)
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59
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60 def __le__(self, other):
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61 return self._cache.__le__(other)
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62
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63 def __eq__(self, other):
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64 return self._cache.__eq__(other)
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65
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66 def __ne__(self, other):
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67 return self._cache.__ne__(other)
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68
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69 def __gt__(self, other):
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70 return self._cache.__gt__(other)
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71
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72 def __ge__(self, other):
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73 return self._cache.__ge__(other)
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74
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75 def __cmp__(self, other):
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76 return self._cache.__cmp__(other)
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77
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78 def __hash__(self):
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79 return self._cache.__hash__()
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80
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81 def __nonzero__(self):
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82 return self._cache.__len__()
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83
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84 def __unicode__(self):
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85 return self._cache.__unicode__()
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86
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87 def __contains__(self, key):
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88 return self._cache.__contains__(key)
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89
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90 def __getitem__(self, key):
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91 return self._cache.__getitem__(key)
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92
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93 def __setitem__(self, key, value):
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94 if not self.profile:
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95 self.storage.setGenPrivate(self.namespace, key, value)
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96 else:
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97 self.storage.setIndPrivate(self.namespace, key, value, self.profile)
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98 return self._cache.__setitem__(key, value)
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99
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100 def __delitem__(self, key):
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101 if not self.profile:
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102 self.storage.delGenPrivate(self.namespace, key)
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103 else:
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104 self.storage.delIndPrivate(self.namespace, key, self.profile)
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105 return self._cache.__delitem__(key)
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106
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107 def get(self, key, default=None):
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108 return self._cache.get(key, default)
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109
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110 def force(self, name):
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111 """Force saving of an attribute to storage
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112 @return: deferred fired when data is actually saved"""
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113 if not self.profile:
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114 return self.storage.setGenPrivate(self.namespace, name, self._cache[name])
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115 return self.storage.setIndPrivate(self.namespace, name, self._cache[name], self.profile)
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116
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117
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118 class PersistentBinaryDict(PersistentDict):
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119 """Persistent dict where value can be any python data (instead of string only)"""
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120
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121 def load(self):
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122 """load persistent data from storage
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123 """
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124 if not self.profile:
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125 return self.storage.loadGenPrivatesBinary(self._cache, self.namespace)
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126 else:
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127 return self.storage.loadIndPrivatesBinary(self._cache, self.namespace, self.profile)
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128
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129 def __setitem__(self, key, value):
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130 if not self.profile:
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131 self.storage.setGenPrivateBinary(self.namespace, key, value)
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132 else:
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133 self.storage.setIndPrivateBinary(self.namespace, key, value, self.profile)
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134 return self._cache.__setitem__(key, value)
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135
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136 def __delitem__(self, key):
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137 if not self.profile:
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138 self.storage.delGenPrivateBinary(self.namespace, key)
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139 else:
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140 self.storage.delIndPrivateBinary(self.namespace, key, self.profile)
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141 return self._cache.__delitem__(key)
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142
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143 def force(self, name):
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144 """Force saving of an attribute to storage
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145 @return: deferred fired when data is actually saved"""
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146 if not self.profile:
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147 return self.storage.setGenPrivateBinary(self.namespace, name, self._cache[name])
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148 return self.storage.setIndPrivateBinary(self.namespace, name, self._cache[name], self.profile)
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149