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annotate OrthancFramework/Sources/Cache/MemoryStringCache.cpp @ 4792:434843934307 storage-cache

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Added a StorageCache in the StorageAccessor
author Alain Mazy <am@osimis.io>
date Thu, 30 Sep 2021 12:14:19 +0200
parents d9473bd5ed43
children 7053502fbf97
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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) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "MemoryStringCache.h"
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25
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26 namespace Orthanc
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27 {
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28 class MemoryStringCache::StringValue : public ICacheable
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29 {
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30 private:
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31 std::string content_;
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32
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33 public:
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34 explicit StringValue(const std::string& content) :
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35 content_(content)
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36 {
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37 }
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38
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39 explicit StringValue(const char* buffer, size_t size) :
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40 content_(buffer, size)
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41 {
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42 }
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43
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44 const std::string& GetContent() const
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45 {
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46 return content_;
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47 }
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48
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49 virtual size_t GetMemoryUsage() const
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50 {
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51 return content_.size();
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52 }
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53 };
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54
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55 size_t MemoryStringCache::GetMaximumSize()
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56 {
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57 return cache_.GetMaximumSize();
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58 }
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59
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60 void MemoryStringCache::SetMaximumSize(size_t size)
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61 {
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62 cache_.SetMaximumSize(size);
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63 }
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64
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65 void MemoryStringCache::Add(const std::string& key,
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66 const std::string& value)
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67 {
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68 cache_.Acquire(key, new StringValue(value));
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69 }
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70
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71 void MemoryStringCache::Add(const std::string& key,
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72 const void* buffer,
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73 size_t size)
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74 {
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75 cache_.Acquire(key, new StringValue(reinterpret_cast<const char*>(buffer), size));
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76 }
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77
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78 void MemoryStringCache::Invalidate(const std::string &key)
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79 {
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80 cache_.Invalidate(key);
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81 }
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82
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83 bool MemoryStringCache::Fetch(std::string& value,
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84 const std::string& key)
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85 {
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86 MemoryObjectCache::Accessor reader(cache_, key, false /* multiple readers are allowed */);
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87
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88 if (reader.IsValid())
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89 {
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90 value = dynamic_cast<StringValue&>(reader.GetValue()).GetContent();
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91 return true;
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92 }
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93 else
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94 {
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95 return false;
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96 }
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97 }
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98 }