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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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1
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4 *
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5 * This program is free software: you can redistribute it and/or
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6 * modify it under the terms of the GNU Affero General Public License
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7 * as published by the Free Software Foundation, either version 3 of
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8 * the License, or (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Affero General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Affero General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 **/
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18
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19 #include "MemoryCache.h"
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20
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21 namespace OrthancPlugins
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22 {
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23 class MemoryCache::Payload : public boost::noncopyable
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24 {
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25 private:
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26 bool hasExpiration_;
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27 boost::posix_time::ptime expiration_;
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28 std::string value_;
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29
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30 public:
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31 Payload(const std::string& value,
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32 unsigned int validity) :
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33 value_(value)
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34 {
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35 if (validity == 0)
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36 {
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37 hasExpiration_ = false;
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38 }
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39 else
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40 {
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41 hasExpiration_ = true;
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42 expiration_ = (boost::posix_time::second_clock::local_time() +
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43 boost::posix_time::seconds(validity));
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44 }
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45 }
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46
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47 bool HasExpired() const
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48 {
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49 return (hasExpiration_ &&
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50 boost::posix_time::second_clock::local_time() >= expiration_);
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51 }
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52
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53 bool GetValue(std::string& target) const
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54 {
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55 if (HasExpired())
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56 {
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57 return false;
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58 }
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59 else
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60 {
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61 target = value_;
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62 return true;
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63 }
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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 void MemoryCache::RemoveOldest()
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69 {
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70 Payload* payload = NULL;
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71 index_.RemoveOldest(payload);
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72 assert(payload != NULL);
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73 delete payload;
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74 }
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75
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76
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77 void MemoryCache::InvalidateInternal(const std::string& key)
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78 {
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79 Payload* payload = NULL;
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80
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81 if (index_.Contains(key, payload))
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82 {
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83 assert(payload != NULL);
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84 delete payload;
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85 index_.Invalidate(key);
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86 }
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87 }
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88
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89
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90 MemoryCache::MemoryCache(unsigned int maxSize) :
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91 maxSize_(maxSize)
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92 {
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93 if (maxSize_ == 0)
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94 {
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95 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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96 }
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97 }
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98
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99
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100 MemoryCache::~MemoryCache()
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101 {
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102 while (!index_.IsEmpty())
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103 {
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104 RemoveOldest();
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105 }
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106 }
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107
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108
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109 void MemoryCache::Invalidate(const std::string& key)
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110 {
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111 boost::mutex::scoped_lock lock(mutex_);
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112 InvalidateInternal(key);
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113 }
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114
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115
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116 void MemoryCache::Store(const std::string& key,
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117 const std::string& value,
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118 unsigned int expiration /* in seconds */)
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119 {
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120 boost::mutex::scoped_lock lock(mutex_);
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121
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122 InvalidateInternal(key);
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123
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124 if (index_.GetSize() == maxSize_)
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125 {
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126 // The cache is full: Make some room
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127 RemoveOldest();
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128 }
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129
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130 index_.Add(key, new Payload(value, expiration));
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131 }
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132
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133
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134 bool MemoryCache::Retrieve(std::string& value,
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135 const std::string& key)
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136 {
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137 boost::mutex::scoped_lock lock(mutex_);
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138
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139 Payload* payload = NULL;
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140
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141 if (!index_.Contains(key, payload))
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142 {
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143 return false;
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144 }
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145
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146 assert(payload != NULL);
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147
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148 if (payload->GetValue(value))
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149 {
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150 index_.MakeMostRecent(key);
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151 return true;
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152 }
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153 else
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154 {
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155 // The value has expired in the cache: Invalidate it
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156 delete payload;
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157 index_.Invalidate(key);
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158 return false;
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159 }
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160 }
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161 }
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