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annotate engine/core/util/resource/pool.h @ 205:54bfd1015b35

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* PyChan event handling rework (part I) ** Unified listeners ** ...hopefully more robust attach/detach code. * Added compat, layout and also the new autopsition feature. * Documentation * Minor style fixes in core.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Sat, 14 Mar 2009 12:13:29 +0000
parents 376b8afc9a18
children b84dbc4665b0
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 struct ResourceLocationComparator {
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44 bool operator()(const ResourceLocation* r1, const ResourceLocation* r2) const
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45 {
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46 return r1->operator<(*r2);
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47 }
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48 };
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49
0
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50 class IResource;
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51
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52 enum { RES_LOADED = 0x01, RES_NON_LOADED = 0x02};
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53
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54 /** Pool is used to optimize memory usage for resources
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55 *
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56 * Pool guarantees that there is minimal amount of resources
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57 * used in cases when it is would possible that multiple
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58 * instances of the same data would be loaded into the memory.
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59 * Pool is the owner for resources taking care of their deletion.
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60 */
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61 class Pool {
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62 public:
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63 /** Indicates invalid index for pool
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64 */
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65 static const int INVALID_ID = -1;
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66
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67 /** Default constructor.
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68 * @param name The name used in debug output.
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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(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 /** Removes the resource from pool if reference counter is null
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101 *
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102 * @param dec Specifies weither the ref counter will be decreased
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103 * before checking
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104 */
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105 virtual void release(unsigned int index, bool dec = false);
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106
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107 /** Purge all loaded resources.
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108 * This will purge all loaded resources with a ref count of zero.
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109 * Indices remain valid, though.
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110 * @return Number of resources deleted.
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111 */
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112 virtual int purgeLoadedResources();
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113
0
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114 /** Gets amount of resources in the pool with given status
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115 */
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116 virtual int getResourceCount(int status);
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117
147
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118 /** Prints the cache statistics to the log
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119 */
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120 virtual void printStatistics();
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121
147
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122 /** Performs a sanity check for the location map.
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123 */
148
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124 void sanityCheck();
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125
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126 /** Resets the pool.
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127 * This will purge all loaded resources with a ref count of zero.
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128 * The location and loader information for the locations is lost.
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129 * Only the resource loaders are retained.
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130 */
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131 virtual void reset();
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132
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133 private:
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134 class PoolEntry {
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135 public:
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136 PoolEntry(): resource(0), location(0), loader(0) {}
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137 ~PoolEntry() {
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138 delete location;
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139 delete resource;
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140 }
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141
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142 // Pointer to the resource that is loaded.
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143 IResource* resource;
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144 // Location of the resource.
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145 ResourceLocation* location;
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146 // Resource loader.
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147 ResourceLoader* loader;
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148 };
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149
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150 void findAndSetProvider(PoolEntry& entry);
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151
0
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152 std::vector<PoolEntry*> m_entries;
156
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153 typedef std::map<ResourceLocation*, int, ResourceLocationComparator> ResourceLocationToEntry;
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154 ResourceLocationToEntry m_location_to_entry;
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155 std::vector<ResourceLoader*> m_loaders;
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156 std::string m_name;
0
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157 };
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158
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159 } // FIFE
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160
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161 #endif