Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Cache/LeastRecentlyUsedIndex.h @ 4662:3badc205cb4c
todo
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 12 May 2021 09:32:20 +0200 |
| parents | d9473bd5ed43 |
| children | 7053502fbf97 |
| rev | line source |
|---|---|
| 282 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
|
1288
6e7e5ed91c2d
upgrade to year 2015
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
689
diff
changeset
|
4 * Department, University Hospital of Liege, Belgium |
|
4437
d9473bd5ed43
upgrade to year 2021
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4199
diff
changeset
|
5 * Copyright (C) 2017-2021 Osimis S.A., Belgium |
| 282 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
|
4119
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
8 * modify it under the terms of the GNU Lesser General Public License |
|
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
9 * as published by the Free Software Foundation, either version 3 of |
|
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
10 * the License, or (at your option) any later version. |
| 282 | 11 * |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
4119
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
15 * Lesser General Public License for more details. |
| 282 | 16 * |
|
4119
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
17 * You should have received a copy of the GNU Lesser General Public |
|
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
18 * License along with this program. If not, see |
|
bf7b9edf6b81
re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
4044
diff
changeset
|
19 * <http://www.gnu.org/licenses/>. |
| 282 | 20 **/ |
| 21 | |
| 22 | |
| 23 #pragma once | |
| 24 | |
| 25 #include <list> | |
| 26 #include <map> | |
|
3453
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
27 #include <vector> |
| 282 | 28 #include <boost/noncopyable.hpp> |
| 283 | 29 #include <cassert> |
| 30 | |
| 31 #include "../OrthancException.h" | |
|
284
06aa7b7b6723
implementation of a single-threaded cache mechanism
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
283
diff
changeset
|
32 #include "../Toolbox.h" |
| 282 | 33 |
| 34 namespace Orthanc | |
| 35 { | |
| 36 /** | |
| 37 * This class implements the index of a cache with least recently | |
| 38 * used (LRU) recycling policy. All the items of the cache index | |
| 39 * can be associated with a payload. | |
| 40 * Reference: http://stackoverflow.com/a/2504317 | |
| 41 **/ | |
| 42 template <typename T, typename Payload = NullType> | |
|
505
f59e4518fd57
rename CacheIndex as LeastRecentlyUsedIndex
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
398
diff
changeset
|
43 class LeastRecentlyUsedIndex : public boost::noncopyable |
| 282 | 44 { |
| 45 private: | |
| 46 typedef std::list< std::pair<T, Payload> > Queue; | |
| 47 typedef std::map<T, typename Queue::iterator> Index; | |
| 48 | |
| 49 Index index_; | |
| 50 Queue queue_; | |
| 51 | |
| 52 /** | |
| 53 * Internal method for debug builds to check whether the internal | |
| 54 * data structures are not corrupted. | |
| 55 **/ | |
| 56 void CheckInvariants() const; | |
| 57 | |
| 58 public: | |
| 59 /** | |
| 60 * Add a new element to the cache index, and make it the most | |
| 61 * recent element. | |
| 62 * \param id The ID of the element. | |
| 63 * \param payload The payload of the element. | |
| 64 **/ | |
| 65 void Add(T id, Payload payload = Payload()); | |
| 66 | |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
67 void AddOrMakeMostRecent(T id, Payload payload = Payload()); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
68 |
| 282 | 69 /** |
| 70 * When accessing an element of the cache, this method tags the | |
| 71 * element as the most recently used. | |
| 72 * \param id The most recently accessed item. | |
| 73 **/ | |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
74 void MakeMostRecent(T id); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
75 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
76 void MakeMostRecent(T id, Payload updatedPayload); |
| 282 | 77 |
| 78 /** | |
| 79 * Remove an element from the cache index. | |
| 80 * \param id The item to remove. | |
| 81 **/ | |
| 82 Payload Invalidate(T id); | |
| 83 | |
| 84 /** | |
| 85 * Get the oldest element in the cache and remove it. | |
| 86 * \return The oldest item. | |
| 87 **/ | |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
88 T RemoveOldest(); |
| 282 | 89 |
| 90 /** | |
| 91 * Get the oldest element in the cache, remove it and return the | |
| 92 * associated payload. | |
| 93 * \param payload Where to store the associated payload. | |
| 94 * \return The oldest item. | |
| 95 **/ | |
| 96 T RemoveOldest(Payload& payload); | |
| 97 | |
| 98 /** | |
| 99 * Check whether an element is contained in the cache. | |
| 100 * \param id The item. | |
| 101 * \return \c true iff the item is indexed by the cache. | |
| 102 **/ | |
| 103 bool Contains(T id) const | |
| 104 { | |
| 105 return index_.find(id) != index_.end(); | |
| 106 } | |
| 107 | |
| 283 | 108 bool Contains(T id, Payload& payload) const |
| 109 { | |
| 110 typename Index::const_iterator it = index_.find(id); | |
| 111 if (it == index_.end()) | |
| 112 { | |
| 113 return false; | |
| 114 } | |
| 115 else | |
| 116 { | |
| 117 payload = it->second->second; | |
| 118 return true; | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 /** | |
| 123 * Return the number of elements in the cache. | |
| 124 * \return The number of elements. | |
| 125 **/ | |
| 126 size_t GetSize() const | |
| 127 { | |
| 128 assert(index_.size() == queue_.size()); | |
| 129 return queue_.size(); | |
| 130 } | |
| 131 | |
| 282 | 132 /** |
| 133 * Check whether the cache index is empty. | |
| 134 * \return \c true iff the cache is empty. | |
| 135 **/ | |
| 136 bool IsEmpty() const | |
| 137 { | |
| 138 return index_.empty(); | |
| 139 } | |
|
507
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
140 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
141 const T& GetOldest() const; |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
142 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
143 const Payload& GetOldestPayload() const; |
|
3453
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
144 |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
145 void GetAllKeys(std::vector<T>& keys) const |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
146 { |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
147 keys.clear(); |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
148 keys.reserve(GetSize()); |
| 4199 | 149 for (typename Index::const_iterator it = index_.begin(); it != index_.end(); ++it) |
|
3453
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
150 { |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
151 keys.push_back(it->first); |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
152 } |
|
8c663bbe5363
LeastRecentlyUsedIndex::GetAllKeys
Alain Mazy <alain@mazy.be>
parents:
3060
diff
changeset
|
153 } |
| 282 | 154 }; |
| 283 | 155 |
| 156 | |
| 157 | |
| 158 | |
| 159 /****************************************************************** | |
| 160 ** Implementation of the template | |
| 161 ******************************************************************/ | |
| 162 | |
| 163 template <typename T, typename Payload> | |
|
505
f59e4518fd57
rename CacheIndex as LeastRecentlyUsedIndex
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
398
diff
changeset
|
164 void LeastRecentlyUsedIndex<T, Payload>::CheckInvariants() const |
| 283 | 165 { |
| 166 #ifndef NDEBUG | |
| 167 assert(index_.size() == queue_.size()); | |
| 168 | |
| 169 for (typename Index::const_iterator | |
| 4199 | 170 it = index_.begin(); it != index_.end(); ++it) |
| 283 | 171 { |
| 172 assert(it->second != queue_.end()); | |
| 173 assert(it->second->first == it->first); | |
| 174 } | |
| 175 #endif | |
| 176 } | |
| 177 | |
| 178 | |
| 179 template <typename T, typename Payload> | |
|
505
f59e4518fd57
rename CacheIndex as LeastRecentlyUsedIndex
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
398
diff
changeset
|
180 void LeastRecentlyUsedIndex<T, Payload>::Add(T id, Payload payload) |
| 283 | 181 { |
| 182 if (Contains(id)) | |
| 183 { | |
| 184 throw OrthancException(ErrorCode_BadSequenceOfCalls); | |
| 185 } | |
| 186 | |
| 187 queue_.push_front(std::make_pair(id, payload)); | |
| 188 index_[id] = queue_.begin(); | |
| 189 | |
| 190 CheckInvariants(); | |
| 191 } | |
| 192 | |
| 193 | |
| 194 template <typename T, typename Payload> | |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
195 void LeastRecentlyUsedIndex<T, Payload>::MakeMostRecent(T id) |
| 283 | 196 { |
| 197 if (!Contains(id)) | |
| 198 { | |
| 199 throw OrthancException(ErrorCode_InexistentItem); | |
| 200 } | |
| 201 | |
| 202 typename Index::iterator it = index_.find(id); | |
| 203 assert(it != index_.end()); | |
| 204 | |
| 205 std::pair<T, Payload> item = *(it->second); | |
| 206 | |
| 207 queue_.erase(it->second); | |
| 208 queue_.push_front(item); | |
| 209 index_[id] = queue_.begin(); | |
| 210 | |
| 211 CheckInvariants(); | |
| 212 } | |
| 213 | |
| 214 | |
| 215 template <typename T, typename Payload> | |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
216 void LeastRecentlyUsedIndex<T, Payload>::AddOrMakeMostRecent(T id, Payload payload) |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
217 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
218 typename Index::iterator it = index_.find(id); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
219 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
220 if (it != index_.end()) |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
221 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
222 // Already existing. Make it most recent. |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
223 std::pair<T, Payload> item = *(it->second); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
224 item.second = payload; |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
225 queue_.erase(it->second); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
226 queue_.push_front(item); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
227 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
228 else |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
229 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
230 // New item |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
231 queue_.push_front(std::make_pair(id, payload)); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
232 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
233 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
234 index_[id] = queue_.begin(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
235 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
236 CheckInvariants(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
237 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
238 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
239 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
240 template <typename T, typename Payload> |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
241 void LeastRecentlyUsedIndex<T, Payload>::MakeMostRecent(T id, Payload updatedPayload) |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
242 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
243 if (!Contains(id)) |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
244 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
245 throw OrthancException(ErrorCode_InexistentItem); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
246 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
247 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
248 typename Index::iterator it = index_.find(id); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
249 assert(it != index_.end()); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
250 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
251 std::pair<T, Payload> item = *(it->second); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
252 item.second = updatedPayload; |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
253 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
254 queue_.erase(it->second); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
255 queue_.push_front(item); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
256 index_[id] = queue_.begin(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
257 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
258 CheckInvariants(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
259 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
260 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
261 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
262 template <typename T, typename Payload> |
|
505
f59e4518fd57
rename CacheIndex as LeastRecentlyUsedIndex
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
398
diff
changeset
|
263 Payload LeastRecentlyUsedIndex<T, Payload>::Invalidate(T id) |
| 283 | 264 { |
| 265 if (!Contains(id)) | |
| 266 { | |
| 267 throw OrthancException(ErrorCode_InexistentItem); | |
| 268 } | |
| 269 | |
| 270 typename Index::iterator it = index_.find(id); | |
| 271 assert(it != index_.end()); | |
| 272 | |
| 273 Payload payload = it->second->second; | |
| 274 queue_.erase(it->second); | |
| 275 index_.erase(it); | |
| 276 | |
| 277 CheckInvariants(); | |
| 278 return payload; | |
| 279 } | |
| 280 | |
| 281 | |
| 282 template <typename T, typename Payload> | |
|
505
f59e4518fd57
rename CacheIndex as LeastRecentlyUsedIndex
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
398
diff
changeset
|
283 T LeastRecentlyUsedIndex<T, Payload>::RemoveOldest(Payload& payload) |
| 283 | 284 { |
| 285 if (IsEmpty()) | |
| 286 { | |
| 287 throw OrthancException(ErrorCode_BadSequenceOfCalls); | |
| 288 } | |
| 289 | |
| 290 std::pair<T, Payload> item = queue_.back(); | |
| 291 T oldest = item.first; | |
| 292 payload = item.second; | |
| 293 | |
| 294 queue_.pop_back(); | |
| 295 assert(index_.find(oldest) != index_.end()); | |
| 296 index_.erase(oldest); | |
| 297 | |
| 298 CheckInvariants(); | |
| 299 | |
| 300 return oldest; | |
| 301 } | |
|
507
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
302 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
303 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
304 template <typename T, typename Payload> |
|
509
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
305 T LeastRecentlyUsedIndex<T, Payload>::RemoveOldest() |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
306 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
307 if (IsEmpty()) |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
308 { |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
309 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
310 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
311 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
312 std::pair<T, Payload> item = queue_.back(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
313 T oldest = item.first; |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
314 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
315 queue_.pop_back(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
316 assert(index_.find(oldest) != index_.end()); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
317 index_.erase(oldest); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
318 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
319 CheckInvariants(); |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
320 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
321 return oldest; |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
322 } |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
323 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
324 |
|
e7841864c97c
StableResourcesMonitor
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
507
diff
changeset
|
325 template <typename T, typename Payload> |
|
507
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
326 const T& LeastRecentlyUsedIndex<T, Payload>::GetOldest() const |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
327 { |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
328 if (IsEmpty()) |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
329 { |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
330 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
331 } |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
332 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
333 return queue_.back().first; |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
334 } |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
335 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
336 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
337 template <typename T, typename Payload> |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
338 const Payload& LeastRecentlyUsedIndex<T, Payload>::GetOldestPayload() const |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
339 { |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
340 if (IsEmpty()) |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
341 { |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
342 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
343 } |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
344 |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
345 return queue_.back().second; |
|
c4122c3a47c1
access to oldest item in LRUCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
505
diff
changeset
|
346 } |
| 282 | 347 } |