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comparison Resources/Orthanc/Core/Cache/MemoryCache.cpp @ 200:03afbee0cc7b

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integration of Orthanc core into Stone
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 23 Mar 2018 11:04:03 +0100
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children 9d269d7cfeb8
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199:dabe9982fca3 200:03afbee0cc7b
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) 2017-2018 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 MemoryCache::Page& MemoryCache::Load(const std::string& id)
42 {
43 // Reuse the cache entry if it already exists
44 Page* p = NULL;
45 if (index_.Contains(id, p))
46 {
47 VLOG(1) << "Reusing a cache page";
48 assert(p != NULL);
49 index_.MakeMostRecent(id);
50 return *p;
51 }
52
53 // The id is not in the cache yet. Make some room if the cache
54 // is full.
55 if (index_.GetSize() == cacheSize_)
56 {
57 VLOG(1) << "Dropping the oldest cache page";
58 index_.RemoveOldest(p);
59 delete p;
60 }
61
62 // Create a new cache page
63 std::auto_ptr<Page> result(new Page);
64 result->id_ = id;
65 result->content_.reset(provider_.Provide(id));
66
67 // Add the newly create page to the cache
68 VLOG(1) << "Registering new data in a cache page";
69 p = result.release();
70 index_.Add(id, p);
71 return *p;
72 }
73
74 MemoryCache::MemoryCache(ICachePageProvider& provider,
75 size_t cacheSize) :
76 provider_(provider),
77 cacheSize_(cacheSize)
78 {
79 }
80
81 MemoryCache::~MemoryCache()
82 {
83 while (!index_.IsEmpty())
84 {
85 Page* element = NULL;
86 index_.RemoveOldest(element);
87 assert(element != NULL);
88 delete element;
89 }
90 }
91
92 IDynamicObject& MemoryCache::Access(const std::string& id)
93 {
94 return *Load(id).content_;
95 }
96 }