Mercurial > hg > orthanc
annotate Core/Cache/MemoryCache.h @ 284:06aa7b7b6723
implementation of a single-threaded cache mechanism
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 12 Dec 2012 15:40:18 +0100 |
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children | 4031f73fe0e4 |
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1 /** |
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege, |
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4 * Belgium |
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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 General Public License as |
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8 * published by the Free Software Foundation, either version 3 of the |
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9 * License, or (at your option) any later version. |
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10 * |
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11 * In addition, as a special exception, the copyright holders of this |
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12 * program give permission to link the code of its release with the |
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it |
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14 * that use the same license as the "OpenSSL" library), and distribute |
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15 * the linked executables. You must obey the GNU General Public License |
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16 * in all respects for all of the code used other than "OpenSSL". If you |
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17 * modify file(s) with this exception, you may extend this exception to |
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18 * your version of the file(s), but you are not obligated to do so. If |
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19 * you do not wish to do so, delete this exception statement from your |
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20 * version. If you delete this exception statement from all source files |
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21 * in the program, then also delete it here. |
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22 * |
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23 * This program is distributed in the hope that it will be useful, but |
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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26 * General Public License for more details. |
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27 * |
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28 * You should have received a copy of the GNU General Public License |
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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30 **/ |
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31 |
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32 |
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33 #pragma once |
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34 |
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35 #include <memory> |
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36 #include "CacheIndex.h" |
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37 #include "ICachePageProvider.h" |
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38 |
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39 namespace Orthanc |
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40 { |
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41 /** |
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42 * WARNING: This class is NOT thread-safe. |
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43 **/ |
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44 class MemoryCache |
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45 { |
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46 private: |
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47 struct Page |
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48 { |
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49 std::string id_; |
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50 std::auto_ptr<IDynamicObject> content_; |
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51 }; |
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52 |
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53 ICachePageProvider& provider_; |
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54 size_t cacheSize_; |
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55 CacheIndex<std::string, Page*> index_; |
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56 |
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57 Page& Load(const std::string& id); |
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58 |
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59 public: |
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60 class Accessor |
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61 { |
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62 friend class MemoryCache; |
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63 |
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64 private: |
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65 Page& element_; |
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66 |
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67 Accessor(Page& element) : |
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68 element_(element) |
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69 { |
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70 } |
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71 |
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72 public: |
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73 const std::string GetId() const |
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74 { |
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75 return element_.id_; |
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76 } |
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77 |
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78 IDynamicObject& GetContent() |
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79 { |
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80 return *element_.content_; |
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81 } |
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82 |
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83 const IDynamicObject& GetContent() const |
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84 { |
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85 return *element_.content_; |
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86 } |
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87 }; |
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88 |
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89 MemoryCache(ICachePageProvider& provider, |
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90 size_t cacheSize); |
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91 |
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92 ~MemoryCache(); |
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93 |
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94 Accessor* Access(const std::string& id); |
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95 }; |
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96 } |