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comparison OrthancFramework/Sources/Cache/MemoryCache.cpp @ 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/MemoryCache.cpp@2a170a8f1faf
children bf7b9edf6b81
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 #include "../PrecompiledHeaders.h"
35 #include "MemoryCache.h"
36
37 #include "../Logging.h"
38
39 namespace Orthanc
40 {
41 namespace Deprecated
42 {
43 MemoryCache::Page& MemoryCache::Load(const std::string& id)
44 {
45 // Reuse the cache entry if it already exists
46 Page* p = NULL;
47 if (index_.Contains(id, p))
48 {
49 VLOG(1) << "Reusing a cache page";
50 assert(p != NULL);
51 index_.MakeMostRecent(id);
52 return *p;
53 }
54
55 // The id is not in the cache yet. Make some room if the cache
56 // is full.
57 if (index_.GetSize() == cacheSize_)
58 {
59 VLOG(1) << "Dropping the oldest cache page";
60 index_.RemoveOldest(p);
61 delete p;
62 }
63
64 // Create a new cache page
65 std::unique_ptr<Page> result(new Page);
66 result->id_ = id;
67 result->content_.reset(provider_.Provide(id));
68
69 // Add the newly create page to the cache
70 VLOG(1) << "Registering new data in a cache page";
71 p = result.release();
72 index_.Add(id, p);
73 return *p;
74 }
75
76 MemoryCache::MemoryCache(ICachePageProvider& provider,
77 size_t cacheSize) :
78 provider_(provider),
79 cacheSize_(cacheSize)
80 {
81 }
82
83 void MemoryCache::Invalidate(const std::string& id)
84 {
85 Page* p = NULL;
86 if (index_.Contains(id, p))
87 {
88 VLOG(1) << "Invalidating a cache page";
89 assert(p != NULL);
90 delete p;
91 index_.Invalidate(id);
92 }
93 }
94
95 MemoryCache::~MemoryCache()
96 {
97 while (!index_.IsEmpty())
98 {
99 Page* element = NULL;
100 index_.RemoveOldest(element);
101 assert(element != NULL);
102 delete element;
103 }
104 }
105
106 IDynamicObject& MemoryCache::Access(const std::string& id)
107 {
108 return *Load(id).content_;
109 }
110 }
111 }