Mercurial > hg > orthanc-stone
annotate Resources/Orthanc/Core/Cache/MemoryCache.cpp @ 204:9d269d7cfeb8
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 28 Mar 2018 11:28:27 +0200 |
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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) 2017-2018 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 General Public License as |
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9 * published by the Free Software Foundation, either version 3 of the |
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10 * License, or (at your option) any later version. |
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11 * |
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12 * In addition, as a special exception, the copyright holders of this |
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13 * program give permission to link the code of its release with the |
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it |
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15 * that use the same license as the "OpenSSL" library), and distribute |
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16 * the linked executables. You must obey the GNU General Public License |
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17 * in all respects for all of the code used other than "OpenSSL". If you |
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18 * modify file(s) with this exception, you may extend this exception to |
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19 * your version of the file(s), but you are not obligated to do so. If |
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20 * you do not wish to do so, delete this exception statement from your |
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21 * version. If you delete this exception statement from all source files |
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22 * in the program, then also delete it here. |
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23 * |
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24 * This program is distributed in the hope that it will be useful, but |
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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27 * General Public License for more details. |
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28 * |
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29 * You should have received a copy of the GNU General Public License |
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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31 **/ |
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32 |
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33 |
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34 #include "../PrecompiledHeaders.h" |
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35 #include "MemoryCache.h" |
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36 |
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37 #include "../Logging.h" |
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38 |
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39 namespace Orthanc |
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40 { |
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41 MemoryCache::Page& MemoryCache::Load(const std::string& id) |
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42 { |
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43 // Reuse the cache entry if it already exists |
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44 Page* p = NULL; |
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45 if (index_.Contains(id, p)) |
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46 { |
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47 VLOG(1) << "Reusing a cache page"; |
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48 assert(p != NULL); |
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49 index_.MakeMostRecent(id); |
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50 return *p; |
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51 } |
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52 |
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53 // The id is not in the cache yet. Make some room if the cache |
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54 // is full. |
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55 if (index_.GetSize() == cacheSize_) |
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56 { |
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57 VLOG(1) << "Dropping the oldest cache page"; |
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58 index_.RemoveOldest(p); |
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59 delete p; |
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60 } |
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61 |
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62 // Create a new cache page |
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63 std::auto_ptr<Page> result(new Page); |
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64 result->id_ = id; |
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65 result->content_.reset(provider_.Provide(id)); |
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66 |
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67 // Add the newly create page to the cache |
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68 VLOG(1) << "Registering new data in a cache page"; |
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69 p = result.release(); |
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70 index_.Add(id, p); |
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71 return *p; |
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72 } |
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73 |
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74 MemoryCache::MemoryCache(ICachePageProvider& provider, |
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75 size_t cacheSize) : |
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76 provider_(provider), |
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77 cacheSize_(cacheSize) |
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78 { |
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79 } |
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80 |
204 | 81 void MemoryCache::Invalidate(const std::string& id) |
82 { | |
83 if (index_.Contains(id)) | |
84 { | |
85 VLOG(1) << "Invalidating a cache page"; | |
86 index_.Invalidate(id); | |
87 } | |
88 } | |
89 | |
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90 MemoryCache::~MemoryCache() |
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91 { |
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92 while (!index_.IsEmpty()) |
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93 { |
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94 Page* element = NULL; |
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95 index_.RemoveOldest(element); |
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96 assert(element != NULL); |
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97 delete element; |
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98 } |
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99 } |
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100 |
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101 IDynamicObject& MemoryCache::Access(const std::string& id) |
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102 { |
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103 return *Load(id).content_; |
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104 } |
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105 } |