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comparison OrthancFramework/Sources/Cache/MemoryObjectCache.h @ 4044:d25f4c0fa160 framework

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splitting code into OrthancFramework and OrthancServer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 10 Jun 2020 20:30:34 +0200
parents Core/Cache/MemoryObjectCache.h@94f4a18a79cc
children e00f3d089991
comparison
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4043:6c6239aec462 4044:d25f4c0fa160
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
11 *
12 * In addition, as a special exception, the copyright holders of this
13 * program give permission to link the code of its release with the
14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
15 * that use the same license as the "OpenSSL" library), and distribute
16 * the linked executables. You must obey the GNU General Public License
17 * in all respects for all of the code used other than "OpenSSL". If you
18 * modify file(s) with this exception, you may extend this exception to
19 * your version of the file(s), but you are not obligated to do so. If
20 * you do not wish to do so, delete this exception statement from your
21 * version. If you delete this exception statement from all source files
22 * in the program, then also delete it here.
23 *
24 * This program is distributed in the hope that it will be useful, but
25 * WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 * General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 **/
32
33
34 #pragma once
35
36 #include "ICacheable.h"
37 #include "LeastRecentlyUsedIndex.h"
38
39 #if !defined(__EMSCRIPTEN__)
40 // Multithreading is not supported in WebAssembly
41 # include <boost/thread/mutex.hpp>
42 # include <boost/thread/shared_mutex.hpp>
43 #endif
44
45 #include <boost/date_time/posix_time/posix_time.hpp>
46
47
48 namespace Orthanc
49 {
50 class MemoryObjectCache : public boost::noncopyable
51 {
52 private:
53 class Item;
54
55 #if !defined(__EMSCRIPTEN__)
56 typedef boost::unique_lock<boost::shared_mutex> WriterLock;
57 typedef boost::shared_lock<boost::shared_mutex> ReaderLock;
58
59 // This mutex protects modifications to the structure of the cache (monitor)
60 boost::mutex cacheMutex_;
61
62 // This mutex protects modifications to the items that are stored in the cache
63 boost::shared_mutex contentMutex_;
64 #endif
65
66 size_t currentSize_;
67 size_t maxSize_;
68 LeastRecentlyUsedIndex<std::string, Item*> content_;
69
70 void Recycle(size_t targetSize);
71
72 public:
73 MemoryObjectCache();
74
75 ~MemoryObjectCache();
76
77 size_t GetMaximumSize();
78
79 void SetMaximumSize(size_t size);
80
81 void Acquire(const std::string& key,
82 ICacheable* value);
83
84 void Invalidate(const std::string& key);
85
86 class Accessor : public boost::noncopyable
87 {
88 private:
89 #if !defined(__EMSCRIPTEN__)
90 ReaderLock readerLock_;
91 WriterLock writerLock_;
92 boost::mutex::scoped_lock cacheLock_;
93 #endif
94
95 Item* item_;
96
97 public:
98 Accessor(MemoryObjectCache& cache,
99 const std::string& key,
100 bool unique);
101
102 bool IsValid() const
103 {
104 return item_ != NULL;
105 }
106
107 ICacheable& GetValue() const;
108
109 const boost::posix_time::ptime& GetTime() const;
110 };
111 };
112 }