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annotate engine/core/util/resource/pool.h @ 147:fb6ccb367dd1

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Added just some docs and a sanityCheck against the difficult to find bugs of the location classes. So if memory usage/load time goes through the roof, try logging 'pool' messages.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Thu, 09 Oct 2008 13:36:13 +0000
parents 54b3984e1afc
children 72c25cc27d8b
rev   line source
0
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_POOL_H
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23 #define FIFE_POOL_H
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24
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25 // Standard C++ library includes
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26 #include <map>
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27 #include <vector>
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28 #include <string>
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29 #include <iostream>
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30 #include <cassert>
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31
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32 // 3rd party library includes
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33
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34 // FIFE includes
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35 // These includes are split up in two parts, separated by one empty line
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36 // First block: files included from the FIFE root src directory
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37 // Second block: files included from the same folder
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38 #include "resource.h"
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39 #include "resource_location.h"
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40
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41 namespace FIFE {
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42
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43 class IResource;
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44
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45 /** Clients of pool get notifications about pool events through this interface
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46 */
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47 class IPoolListener {
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48 public:
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49 virtual void poolCleared() = 0;
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50 virtual ~IPoolListener() {};
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51 };
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52
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53 enum { RES_LOADED = 0x01, RES_NON_LOADED = 0x02};
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54
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55 /** Pool is used to optimize memory usage for resources
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56 *
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57 * Pool guarantees that there is minimal amount of resources
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58 * used in cases when it is would possible that multiple
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59 * instances of the same data would be loaded into the memory.
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60 * Pool is the owner for resources taking care of their deletion.
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61 */
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62 class Pool {
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63 public:
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64 /** Indicates invalid index for pool
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65 */
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66 static const int INVALID_ID = -1;
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67
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68 /** Default constructor.
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69 */
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70 Pool(const std::string& name);
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71
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72 /** Destructor.
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73 */
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74 virtual ~Pool();
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75
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76 /** Adds new resource provider. Transfers provider ownership to the pool
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77 */
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78 virtual void addResourceLoader(ResourceLoader* loader);
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79
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80 /** Adds new resource into the pool using the given location.
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81 * @return The index of the resource in the pool.
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82 */
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83 virtual int addResourceFromLocation(const ResourceLocation& loc);
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84
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85 /** This is a convenience version of addResourceFromLocation().
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86 * It converts the filename into a ResourceLocation and then
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87 * calls addResourceFromLocation.
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88 *
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89 * @param filename The file to be loaded.
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90 * @return The index of the resource in the pool.
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91 */
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92 virtual int addResourceFromFile(const std::string& filename);
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93
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94 /** Gets resource from pool with given index
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95 *
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96 * @param inc Specifies weither this call will increase the ref counter
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97 */
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98 virtual IResource& get(unsigned int index, bool inc = false);
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99
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100 /** Gets resource index from pool with given filename
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101 * The resource will be created if it is not in the pool
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102 */
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103 virtual int getIndex(const std::string& filename);
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104
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105 /** Removes the resource from pool if reference counter is null
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106 *
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107 * @param dec Specifies weither the ref counter will be decreased
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108 * before checking
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109 */
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110 virtual void release(unsigned int index, bool dec = false);
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111
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112 /** Gets amount of resources in the pool with given status
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113 */
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114 virtual int getResourceCount(int status);
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115
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116 /** Clears pool from resources. Frees associated memory
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117 */
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118 virtual void clear();
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119
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120 /** Adds pool listener.
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121 * Pool listeners get indications e.g. when ownerships of pooled
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122 * resources change.
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123 */
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124 virtual void addPoolListener(IPoolListener* listener);
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125
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126 /** Removes pool listener
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127 */
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128 virtual void removePoolListener(IPoolListener* listener);
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129
147
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130 /** Prints the cache statistics to the log
0
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131 */
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132 virtual void printStatistics();
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133
147
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134 /** Performs a sanity check for the location map.
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135 */
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136 virtual void sanityCheck();
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137
0
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138 protected:
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139 private:
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140 class PoolEntry {
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141 public:
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142 PoolEntry(): resource(0), location(0), loader(0) {}
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143 ~PoolEntry() {
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144 delete location;
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145 delete resource;
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146 }
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147
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148 // Pointer to the resource that is loaded.
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149 IResource* resource;
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150 // Location of the resource.
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151 ResourceLocation* location;
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152 // Resource loader.
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153 ResourceLoader* loader;
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154 };
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155
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156 void findAndSetProvider(PoolEntry& entry);
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157
0
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158 std::vector<PoolEntry*> m_entries;
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159 typedef std::map<ResourceLocation, int> ResourceLocationToEntry;
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160 ResourceLocationToEntry m_location_to_entry;
0
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161 std::vector<IPoolListener*> m_listeners;
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162 std::vector<ResourceLoader*> m_loaders;
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163 int m_curind;
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164 std::string m_name;
0
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165 };
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166
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167 } // FIFE
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168
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169 #endif