Mercurial > cpython-lru_cache-weakref

annotate Modules/_sqlite/cache.c @ 41959:f2277439dcdc 2.5

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Backport rev. 55783: Patch by Tim Delany (missing DECREF). SF #1731330.
author Georg Brandl <georg@python.org>
date Tue, 05 Jun 2007 22:06:28 +0000
parents 7da4af95ebad
children 787b969d37f0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* cache .c - a LRU cache
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2 *
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3 * Copyright (C) 2004-2006 Gerhard Häring <gh@ghaering.de>
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4 *
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5 * This file is part of pysqlite.
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6 *
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7 * This software is provided 'as-is', without any express or implied
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8 * warranty. In no event will the authors be held liable for any damages
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9 * arising from the use of this software.
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10 *
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, subject to the following restrictions:
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14 *
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15 * 1. The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software. If you use this software
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17 * in a product, an acknowledgment in the product documentation would be
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18 * appreciated but is not required.
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19 * 2. Altered source versions must be plainly marked as such, and must not be
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20 * misrepresented as being the original software.
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21 * 3. This notice may not be removed or altered from any source distribution.
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22 */
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23
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24 #include "cache.h"
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25 #include <limits.h>
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26
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27 /* only used internally */
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28 Node* new_node(PyObject* key, PyObject* data)
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29 {
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30 Node* node;
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31
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32 node = (Node*) (NodeType.tp_alloc(&NodeType, 0));
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33 if (!node) {
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34 return NULL;
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35 }
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36
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37 Py_INCREF(key);
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38 node->key = key;
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39
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40 Py_INCREF(data);
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41 node->data = data;
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42
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43 node->prev = NULL;
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44 node->next = NULL;
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45
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46 return node;
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47 }
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48
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49 void node_dealloc(Node* self)
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50 {
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51 Py_DECREF(self->key);
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52 Py_DECREF(self->data);
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53
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54 self->ob_type->tp_free((PyObject*)self);
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55 }
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56
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57 int cache_init(Cache* self, PyObject* args, PyObject* kwargs)
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58 {
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59 PyObject* factory;
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60 int size = 10;
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61
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62 self->factory = NULL;
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63
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64 if (!PyArg_ParseTuple(args, "O|i", &factory, &size)) {
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65 return -1;
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66 }
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67
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68 /* minimum cache size is 5 entries */
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69 if (size < 5) {
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70 size = 5;
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71 }
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72 self->size = size;
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73 self->first = NULL;
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74 self->last = NULL;
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75
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76 self->mapping = PyDict_New();
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77 if (!self->mapping) {
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78 return -1;
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79 }
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80
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81 Py_INCREF(factory);
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82 self->factory = factory;
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83
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84 self->decref_factory = 1;
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85
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86 return 0;
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87 }
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88
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89 void cache_dealloc(Cache* self)
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90 {
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91 Node* node;
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92 Node* delete_node;
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93
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94 if (!self->factory) {
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95 /* constructor failed, just get out of here */
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96 return;
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97 }
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98
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99 /* iterate over all nodes and deallocate them */
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100 node = self->first;
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101 while (node) {
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102 delete_node = node;
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103 node = node->next;
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104 Py_DECREF(delete_node);
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105 }
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106
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107 if (self->decref_factory) {
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108 Py_DECREF(self->factory);
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109 }
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110 Py_DECREF(self->mapping);
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111
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112 self->ob_type->tp_free((PyObject*)self);
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113 }
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114
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115 PyObject* cache_get(Cache* self, PyObject* args)
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116 {
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117 PyObject* key = args;
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118 Node* node;
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119 Node* ptr;
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120 PyObject* data;
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121
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122 node = (Node*)PyDict_GetItem(self->mapping, key);
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123 if (node) {
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124 /* an entry for this key already exists in the cache */
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125
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126 /* increase usage counter of the node found */
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127 if (node->count < LONG_MAX) {
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128 node->count++;
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129 }
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130
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131 /* if necessary, reorder entries in the cache by swapping positions */
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132 if (node->prev && node->count > node->prev->count) {
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133 ptr = node->prev;
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134
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135 while (ptr->prev && node->count > ptr->prev->count) {
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136 ptr = ptr->prev;
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137 }
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138
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139 if (node->next) {
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140 node->next->prev = node->prev;
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141 } else {
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142 self->last = node->prev;
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143 }
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144 if (node->prev) {
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145 node->prev->next = node->next;
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146 }
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147 if (ptr->prev) {
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148 ptr->prev->next = node;
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149 } else {
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150 self->first = node;
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151 }
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152
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153 node->next = ptr;
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154 node->prev = ptr->prev;
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155 if (!node->prev) {
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156 self->first = node;
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157 }
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158 ptr->prev = node;
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159 }
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160 } else {
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161 /* There is no entry for this key in the cache, yet. We'll insert a new
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162 * entry in the cache, and make space if necessary by throwing the
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163 * least used item out of the cache. */
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164
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165 if (PyDict_Size(self->mapping) == self->size) {
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166 if (self->last) {
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167 node = self->last;
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168
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169 if (PyDict_DelItem(self->mapping, self->last->key) != 0) {
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170 return NULL;
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171 }
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172
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173 if (node->prev) {
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174 node->prev->next = NULL;
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175 }
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176 self->last = node->prev;
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177 node->prev = NULL;
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178
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179 Py_DECREF(node);
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180 }
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181 }
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182
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183 data = PyObject_CallFunction(self->factory, "O", key);
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184
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185 if (!data) {
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186 return NULL;
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187 }
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188
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189 node = new_node(key, data);
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190 if (!node) {
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191 return NULL;
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192 }
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193 node->prev = self->last;
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194
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195 Py_DECREF(data);
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196
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197 if (PyDict_SetItem(self->mapping, key, (PyObject*)node) != 0) {
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198 Py_DECREF(node);
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199 return NULL;
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200 }
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201
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202 if (self->last) {
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203 self->last->next = node;
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204 } else {
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205 self->first = node;
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206 }
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207 self->last = node;
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208 }
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209
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210 Py_INCREF(node->data);
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211 return node->data;
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212 }
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213
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214 PyObject* cache_display(Cache* self, PyObject* args)
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215 {
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216 Node* ptr;
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217 PyObject* prevkey;
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218 PyObject* nextkey;
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219 PyObject* fmt_args;
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220 PyObject* template;
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221 PyObject* display_str;
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222
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223 ptr = self->first;
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224
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225 while (ptr) {
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226 if (ptr->prev) {
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227 prevkey = ptr->prev->key;
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228 } else {
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229 prevkey = Py_None;
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230 }
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231 Py_INCREF(prevkey);
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232
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233 if (ptr->next) {
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234 nextkey = ptr->next->key;
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235 } else {
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236 nextkey = Py_None;
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237 }
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238 Py_INCREF(nextkey);
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239
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240 fmt_args = Py_BuildValue("OOO", prevkey, ptr->key, nextkey);
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241 if (!fmt_args) {
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242 return NULL;
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243 }
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244 template = PyString_FromString("%s <- %s ->%s\n");
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245 if (!template) {
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246 Py_DECREF(fmt_args);
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247 return NULL;
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248 }
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249 display_str = PyString_Format(template, fmt_args);
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250 Py_DECREF(template);
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251 Py_DECREF(fmt_args);
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252 if (!display_str) {
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253 return NULL;
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254 }
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255 PyObject_Print(display_str, stdout, Py_PRINT_RAW);
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256 Py_DECREF(display_str);
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257
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258 Py_DECREF(prevkey);
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259 Py_DECREF(nextkey);
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260
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261 ptr = ptr->next;
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262 }
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263
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264 Py_INCREF(Py_None);
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265 return Py_None;
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266 }
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267
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268 static PyMethodDef cache_methods[] = {
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269 {"get", (PyCFunction)cache_get, METH_O,
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270 PyDoc_STR("Gets an entry from the cache or calls the factory function to produce one.")},
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271 {"display", (PyCFunction)cache_display, METH_NOARGS,
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272 PyDoc_STR("For debugging only.")},
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273 {NULL, NULL}
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274 };
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275
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276 PyTypeObject NodeType = {
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277 PyObject_HEAD_INIT(NULL)
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278 0, /* ob_size */
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279 MODULE_NAME "Node", /* tp_name */
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280 sizeof(Node), /* tp_basicsize */
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281 0, /* tp_itemsize */
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282 (destructor)node_dealloc, /* tp_dealloc */
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283 0, /* tp_print */
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284 0, /* tp_getattr */
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285 0, /* tp_setattr */
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286 0, /* tp_compare */
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287 0, /* tp_repr */
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288 0, /* tp_as_number */
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289 0, /* tp_as_sequence */
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290 0, /* tp_as_mapping */
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291 0, /* tp_hash */
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292 0, /* tp_call */
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293 0, /* tp_str */
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294 0, /* tp_getattro */
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295 0, /* tp_setattro */
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296 0, /* tp_as_buffer */
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297 Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
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298 0, /* tp_doc */
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299 0, /* tp_traverse */
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300 0, /* tp_clear */
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301 0, /* tp_richcompare */
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302 0, /* tp_weaklistoffset */
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303 0, /* tp_iter */
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304 0, /* tp_iternext */
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305 0, /* tp_methods */
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306 0, /* tp_members */
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307 0, /* tp_getset */
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308 0, /* tp_base */
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309 0, /* tp_dict */
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310 0, /* tp_descr_get */
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311 0, /* tp_descr_set */
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312 0, /* tp_dictoffset */
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313 (initproc)0, /* tp_init */
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314 0, /* tp_alloc */
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315 0, /* tp_new */
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316 0 /* tp_free */
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317 };
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318
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319 PyTypeObject CacheType = {
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320 PyObject_HEAD_INIT(NULL)
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321 0, /* ob_size */
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322 MODULE_NAME ".Cache", /* tp_name */
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323 sizeof(Cache), /* tp_basicsize */
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324 0, /* tp_itemsize */
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325 (destructor)cache_dealloc, /* tp_dealloc */
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326 0, /* tp_print */
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327 0, /* tp_getattr */
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328 0, /* tp_setattr */
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329 0, /* tp_compare */
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330 0, /* tp_repr */
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331 0, /* tp_as_number */
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332 0, /* tp_as_sequence */
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333 0, /* tp_as_mapping */
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334 0, /* tp_hash */
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335 0, /* tp_call */
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336 0, /* tp_str */
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337 0, /* tp_getattro */
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338 0, /* tp_setattro */
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339 0, /* tp_as_buffer */
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340 Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
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341 0, /* tp_doc */
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342 0, /* tp_traverse */
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343 0, /* tp_clear */
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344 0, /* tp_richcompare */
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345 0, /* tp_weaklistoffset */
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346 0, /* tp_iter */
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347 0, /* tp_iternext */
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348 cache_methods, /* tp_methods */
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349 0, /* tp_members */
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350 0, /* tp_getset */
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351 0, /* tp_base */
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352 0, /* tp_dict */
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353 0, /* tp_descr_get */
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354 0, /* tp_descr_set */
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355 0, /* tp_dictoffset */
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356 (initproc)cache_init, /* tp_init */
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357 0, /* tp_alloc */
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358 0, /* tp_new */
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359 0 /* tp_free */
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360 };
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361
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362 extern int cache_setup_types(void)
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363 {
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364 int rc;
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365
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366 NodeType.tp_new = PyType_GenericNew;
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367 CacheType.tp_new = PyType_GenericNew;
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368
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369 rc = PyType_Ready(&NodeType);
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370 if (rc < 0) {
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371 return rc;
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372 }
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373
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374 rc = PyType_Ready(&CacheType);
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375 return rc;
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376 }