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annotate src/memory/persistent.py @ 597:cc09cc8c78fc

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core: version update to development version
author Goffi <goffi@goffi.org>
date Wed, 20 Feb 2013 19:52:46 +0100
parents e5a875a3311b
children 84a6e83157c2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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25 class MemoryNotInitializedError(Exception):
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26 pass
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27
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28
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29 class PersistentDict(object):
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30 r"""A dictionary which save persistently each value assigned
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31 /!\ be careful, each assignment means a database write
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32 /!\ Memory must be initialised before loading/setting value with instances of this class"""
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33 storage = None
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34
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35 def __init__(self, namespace, profile=None):
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36 """@param namespace: unique namespace for this dictionary
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37 @param profile: profile which *MUST* exists, or None for general values"""
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38 if not self.storage:
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39 error(_("PersistentDict can't be used before memory initialisation"))
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40 raise MemoryNotInitializedError
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41 self._cache = {}
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42 self.namespace = namespace
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43 self.profile = profile
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44
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45 def load(self):
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46 """load persistent data from storage
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47 """
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48 if not self.profile:
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49 return self.storage.loadGenPrivates(self._cache, self.namespace)
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50 else:
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51 return self.storage.loadIndPrivates(self._cache, self.namespace, self.profile)
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52
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53 def __repr__(self):
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54 return self._cache.__repr__()
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55
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56 def __str__(self):
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57 return self._cache.__str__()
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58
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59 def __lt__(self, other):
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60 return self._cache.__lt__(other)
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61
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62 def __le__(self, other):
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63 return self._cache.__le__(other)
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64
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65 def __eq__(self, other):
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66 return self._cache.__eq__(other)
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67
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68 def __ne__(self, other):
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69 return self._cache.__ne__(other)
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71 def __gt__(self, other):
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72 return self._cache.__gt__(other)
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73
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74 def __ge__(self, other):
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75 return self._cache.__ge__(other)
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76
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77 def __cmp__(self, other):
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78 return self._cache.__cmp__(other)
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79
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80 def __hash__(self):
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81 return self._cache.__hash__()
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82
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83 def __nonzero__(self):
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84 return self._cache.__len__()
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85
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86 def __contains__(self, key):
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87 return self._cache.__contains__(key)
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88
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89 def __getitem__(self, key):
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90 return self._cache.__getitem__(key)
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91
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92 def __setitem__(self, key, value):
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93 if not self.profile:
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94 self.storage.setGenPrivate(self.namespace, key, value)
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95 else:
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96 self.storage.setIndPrivate(self.namespace, key, value, self.profile)
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97 return self._cache.__setitem__(key, value)
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98
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99 def __delitem__(self, key):
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100 if not self.profile:
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101 self.storage.delGenPrivate(self.namespace, key)
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102 else:
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103 self.storage.delIndPrivate(self.namespace, key, self.profile)
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104 return self._cache.__delitem__(key)
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105
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106 def get(self, key, default=None):
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107 return self._cache.get(key, default)
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108
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109 def force(self, name):
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110 """Force saving of an attribute to storage
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111 @return: deferred fired when data is actually saved"""
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112 if not self.profile:
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113 return self.storage.setGenPrivate(self.namespace, name, self._cache[name])
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114 return self.storage.setIndPrivate(self.namespace, name, self._cache[name], self.profile)
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115
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116
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117 class PersistentBinaryDict(PersistentDict):
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118 """Persistent dict where value can be any python data (instead of string only)"""
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119
432
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120 def load(self):
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121 """load persistent data from storage
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122 """
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123 if not self.profile:
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124 return self.storage.loadGenPrivatesBinary(self._cache, self.namespace)
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125 else:
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126 return self.storage.loadIndPrivatesBinary(self._cache, self.namespace, self.profile)
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127
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128 def __setitem__(self, key, value):
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129 if not self.profile:
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130 self.storage.setGenPrivateBinary(self.namespace, key, value)
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131 else:
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132 self.storage.setIndPrivateBinary(self.namespace, key, value, self.profile)
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133 return self._cache.__setitem__(key, value)
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134
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135 def __delitem__(self, key):
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136 if not self.profile:
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137 self.storage.delGenPrivateBinary(self.namespace, key)
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138 else:
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139 self.storage.delIndPrivateBinary(self.namespace, key, self.profile)
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140 return self._cache.__delitem__(key)
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141
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142 def force(self, name):
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143 """Force saving of an attribute to storage
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144 @return: deferred fired when data is actually saved"""
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145 if not self.profile:
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146 return self.storage.setGenPrivateBinary(self.namespace, name, self._cache[name])
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147 return self.storage.setIndPrivateBinary(self.namespace, name, self._cache[name], self.profile)