Mercurial > hg > orthanc
comparison 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 |
parents | |
children | 4031f73fe0e4 |
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283:c9977db00e1d | 284:06aa7b7b6723 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege, | |
4 * Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #pragma once | |
34 | |
35 #include <memory> | |
36 #include "CacheIndex.h" | |
37 #include "ICachePageProvider.h" | |
38 | |
39 namespace Orthanc | |
40 { | |
41 /** | |
42 * WARNING: This class is NOT thread-safe. | |
43 **/ | |
44 class MemoryCache | |
45 { | |
46 private: | |
47 struct Page | |
48 { | |
49 std::string id_; | |
50 std::auto_ptr<IDynamicObject> content_; | |
51 }; | |
52 | |
53 ICachePageProvider& provider_; | |
54 size_t cacheSize_; | |
55 CacheIndex<std::string, Page*> index_; | |
56 | |
57 Page& Load(const std::string& id); | |
58 | |
59 public: | |
60 class Accessor | |
61 { | |
62 friend class MemoryCache; | |
63 | |
64 private: | |
65 Page& element_; | |
66 | |
67 Accessor(Page& element) : | |
68 element_(element) | |
69 { | |
70 } | |
71 | |
72 public: | |
73 const std::string GetId() const | |
74 { | |
75 return element_.id_; | |
76 } | |
77 | |
78 IDynamicObject& GetContent() | |
79 { | |
80 return *element_.content_; | |
81 } | |
82 | |
83 const IDynamicObject& GetContent() const | |
84 { | |
85 return *element_.content_; | |
86 } | |
87 }; | |
88 | |
89 MemoryCache(ICachePageProvider& provider, | |
90 size_t cacheSize); | |
91 | |
92 ~MemoryCache(); | |
93 | |
94 Accessor* Access(const std::string& id); | |
95 }; | |
96 } |