Mercurial > hg > orthanc

annotate OrthancFramework/Sources/FileStorage/StorageCache.cpp @ 5420:d37dff2c0028 am-new-cache

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Optimized the MemoryStringCache to prevent loading the same file multiple times if multiple users request the same file at the same time
author Alain Mazy <am@osimis.io>
date Mon, 13 Nov 2023 17:01:59 +0100
parents 0ea402b4d901
children c65e036d649b
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "StorageCache.h"
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26
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27 #include "../Compatibility.h"
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28 #include "../Logging.h"
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29 #include "../OrthancException.h"
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30
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31 #include <boost/lexical_cast.hpp>
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33
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34 namespace Orthanc
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35 {
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36 static std::string GetCacheKeyFullFile(const std::string& uuid,
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37 FileContentType contentType)
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38 {
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39 return uuid + ":" + boost::lexical_cast<std::string>(contentType) + ":1";
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40 }
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41
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42 static std::string GetCacheKeyStartRange(const std::string& uuid,
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43 FileContentType contentType)
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44 {
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45 return uuid + ":" + boost::lexical_cast<std::string>(contentType) + ":0";
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46 }
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47
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48 void StorageCache::SetMaximumSize(size_t size)
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49 {
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50 cache_.SetMaximumSize(size);
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51 }
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52
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53
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54 void StorageCache::Invalidate(const std::string& uuid,
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55 FileContentType contentType)
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56 {
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57 // invalidate both full file + start range file
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58 const std::string keyFullFile = GetCacheKeyFullFile(uuid, contentType);
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59 cache_.Invalidate(keyFullFile);
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60
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61 const std::string keyPartialFile = GetCacheKeyStartRange(uuid, contentType);
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62 cache_.Invalidate(keyPartialFile);
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63 }
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64
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65
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66 StorageCache::Accessor::Accessor(StorageCache& cache)
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67 : MemoryStringCache::Accessor(cache.cache_)
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68 {
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69 }
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70
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71 void StorageCache::Accessor::Add(const std::string& uuid,
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72 FileContentType contentType,
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73 const std::string& value)
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74 {
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75
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76 std::string key = GetCacheKeyFullFile(uuid, contentType);
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77 MemoryStringCache::Accessor::Add(key, value);
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78 }
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79
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80 void StorageCache::Accessor::AddStartRange(const std::string& uuid,
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81 FileContentType contentType,
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82 const std::string& value)
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83 {
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84 const std::string key = GetCacheKeyStartRange(uuid, contentType);
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85 MemoryStringCache::Accessor::Add(key, value);
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86 }
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87
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88 void StorageCache::Accessor::Add(const std::string& uuid,
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89 FileContentType contentType,
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90 const void* buffer,
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91 size_t size)
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92 {
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93 const std::string key = GetCacheKeyFullFile(uuid, contentType);
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94 MemoryStringCache::Accessor::Add(key, reinterpret_cast<const char*>(buffer), size);
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95 }
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96
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97 bool StorageCache::Accessor::Fetch(std::string& value,
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98 const std::string& uuid,
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99 FileContentType contentType)
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100 {
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101 const std::string key = GetCacheKeyFullFile(uuid, contentType);
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102 if (MemoryStringCache::Accessor::Fetch(value, key))
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103 {
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104 LOG(INFO) << "Read attachment \"" << uuid << "\" with content type "
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105 << boost::lexical_cast<std::string>(contentType) << " from cache";
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106 return true;
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107 }
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108 else
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109 {
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110 return false;
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111 }
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112 }
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113
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114 bool StorageCache::Accessor::FetchStartRange(std::string& value,
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115 const std::string& uuid,
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116 FileContentType contentType,
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117 uint64_t end /* exclusive */)
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118 {
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119 const std::string keyPartialFile = GetCacheKeyStartRange(uuid, contentType);
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120 if (MemoryStringCache::Accessor::Fetch(value, keyPartialFile) && value.size() >= end)
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121 {
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122 if (value.size() > end) // the start range that has been cached is larger than the requested value
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123 {
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124 value.resize(end);
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125 }
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126
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127 LOG(INFO) << "Read start of attachment \"" << uuid << "\" with content type "
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128 << boost::lexical_cast<std::string>(contentType) << " from cache";
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129 return true;
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130 }
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131
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132 return false;
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133 }
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134 }