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annotate Core/Cache/MemoryCache.h @ 284:06aa7b7b6723

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implementation of a single-threaded cache mechanism
author Sebastien Jodogne <s.jodogne@gmail.com>
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 }