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annotate OrthancFramework/Sources/FileStorage/StorageCache.h @ 5853:4d932683049d get-scu tip

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very first implementation of C-Get SCU
author Alain Mazy <am@orthanc.team>
date Tue, 29 Oct 2024 17:25:49 +0100
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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) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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23
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24
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25 #pragma once
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26
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27 #include "../Cache/MemoryStringCache.h"
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28
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29 #include "../Compatibility.h" // For ORTHANC_OVERRIDE
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30
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31 #include <boost/thread/mutex.hpp>
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32 #include <map>
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33
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34 namespace Orthanc
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35 {
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36 /**
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37 * Note: this class is thread safe
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38 **/
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39 class ORTHANC_PUBLIC StorageCache : public boost::noncopyable
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40 {
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41 public:
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42
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43 // The StorageCache is only accessible through this accessor.
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44 // It will make sure that only one user will fill load data and fill
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45 // the cache if multiple users try to access the same item at the same time.
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46 // This scenario happens a lot when multiple workers from a viewer access
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47 // the same file.
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48 class Accessor : public MemoryStringCache::Accessor
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49 {
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50 StorageCache& storageCache_;
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51 public:
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52 explicit Accessor(StorageCache& cache);
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53
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54 void Add(const std::string& uuid,
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55 FileContentType contentType,
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56 const std::string& value);
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57
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58 void AddStartRange(const std::string& uuid,
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59 FileContentType contentType,
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60 const std::string& value);
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61
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62 void Add(const std::string& uuid,
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63 FileContentType contentType,
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64 const void* buffer,
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65 size_t size);
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66
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67 bool Fetch(std::string& value,
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68 const std::string& uuid,
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69 FileContentType contentType);
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70
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71 bool FetchStartRange(std::string& value,
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72 const std::string& uuid,
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73 FileContentType contentType,
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74 uint64_t end /* exclusive */);
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75
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76 bool FetchTranscodedInstance(std::string& value,
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77 const std::string& uuid,
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78 DicomTransferSyntax targetSyntax);
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79
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80 void AddTranscodedInstance(const std::string& uuid,
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81 DicomTransferSyntax targetSyntax,
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82 const void* buffer,
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83 size_t size);
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84 };
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85
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86 private:
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87 MemoryStringCache cache_;
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88 std::set<DicomTransferSyntax> subKeysTransferSyntax_;
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89 boost::mutex subKeysMutex_;
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90
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91 public:
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92 void SetMaximumSize(size_t size);
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93
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94 void Invalidate(const std::string& uuid,
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95 FileContentType contentType);
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96
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97 size_t GetCurrentSize() const;
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98
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99 size_t GetNumberOfItems() const;
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100
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101 private:
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102 void Add(const std::string& uuid,
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103 FileContentType contentType,
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104 const std::string& value);
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105
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106 void AddStartRange(const std::string& uuid,
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107 FileContentType contentType,
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108 const std::string& value);
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109
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110 void Add(const std::string& uuid,
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111 FileContentType contentType,
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112 const void* buffer,
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113 size_t size);
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114
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115 bool Fetch(std::string& value,
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116 const std::string& uuid,
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117 FileContentType contentType);
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118
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119 bool FetchStartRange(std::string& value,
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120 const std::string& uuid,
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121 FileContentType contentType,
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122 uint64_t end /* exclusive */);
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123
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124 };
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125 }