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1 /**
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2 * Advanced authorization plugin for Orthanc
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3 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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4 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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1
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU Affero General Public License
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8 * as published by the Free Software Foundation, either version 3 of
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9 * the License, or (at your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * 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 * Affero 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 Affero General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20 #include "MemoryCache.h"
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21
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22 namespace OrthancPlugins
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23 {
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24 class MemoryCache::Payload : public boost::noncopyable
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25 {
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26 private:
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27 bool hasExpiration_;
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28 boost::posix_time::ptime expiration_;
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29 std::string value_;
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30
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31 public:
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32 Payload(const std::string& value,
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33 unsigned int validity) :
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34 value_(value)
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35 {
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36 if (validity == 0)
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37 {
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38 hasExpiration_ = false;
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39 }
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40 else
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41 {
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42 hasExpiration_ = true;
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43 expiration_ = (boost::posix_time::second_clock::local_time() +
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44 boost::posix_time::seconds(validity));
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45 }
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46 }
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47
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48 bool HasExpired() const
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49 {
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50 return (hasExpiration_ &&
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51 boost::posix_time::second_clock::local_time() >= expiration_);
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52 }
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53
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54 bool GetValue(std::string& target) const
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55 {
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56 if (HasExpired())
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57 {
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58 return false;
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59 }
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60 else
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61 {
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62 target = value_;
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63 return true;
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64 }
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65 }
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66 };
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67
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68
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69 void MemoryCache::RemoveOldest()
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70 {
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71 Payload* payload = NULL;
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72 index_.RemoveOldest(payload);
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73 assert(payload != NULL);
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74 delete payload;
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75 }
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76
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77
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78 void MemoryCache::InvalidateInternal(const std::string& key)
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79 {
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80 Payload* payload = NULL;
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81
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82 if (index_.Contains(key, payload))
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83 {
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84 assert(payload != NULL);
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85 delete payload;
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86 index_.Invalidate(key);
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87 }
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88 }
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89
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90
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91 MemoryCache::MemoryCache(unsigned int maxSize) :
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92 maxSize_(maxSize)
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93 {
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94 if (maxSize_ == 0)
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95 {
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96 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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97 }
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98 }
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99
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100
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101 MemoryCache::~MemoryCache()
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102 {
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103 while (!index_.IsEmpty())
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104 {
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105 RemoveOldest();
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106 }
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107 }
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108
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109
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110 void MemoryCache::Invalidate(const std::string& key)
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111 {
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112 boost::mutex::scoped_lock lock(mutex_);
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113 InvalidateInternal(key);
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114 }
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115
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116
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117 void MemoryCache::Store(const std::string& key,
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118 const std::string& value,
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119 unsigned int expiration /* in seconds */)
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120 {
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121 boost::mutex::scoped_lock lock(mutex_);
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122
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123 InvalidateInternal(key);
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124
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125 if (index_.GetSize() == maxSize_)
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126 {
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127 // The cache is full: Make some room
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128 RemoveOldest();
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129 }
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130
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131 index_.Add(key, new Payload(value, expiration));
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132 }
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133
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134
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135 bool MemoryCache::Retrieve(std::string& value,
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136 const std::string& key)
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137 {
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138 boost::mutex::scoped_lock lock(mutex_);
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139
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140 Payload* payload = NULL;
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141
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142 if (!index_.Contains(key, payload))
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143 {
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144 return false;
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145 }
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146
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147 assert(payload != NULL);
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148
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149 if (payload->GetValue(value))
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150 {
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151 index_.MakeMostRecent(key);
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152 return true;
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153 }
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154 else
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155 {
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156 // The value has expired in the cache: Invalidate it
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157 delete payload;
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158 index_.Invalidate(key);
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159 return false;
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160 }
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161 }
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162 }
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