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annotate OrthancFramework/Sources/Cache/LeastRecentlyUsedIndex.h @ 4544:ae63b301d522 Orthanc-1.7.4
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 02 Mar 2021 16:52:26 +0100 |
| parents | fbc49a65340a |
| children | d9473bd5ed43 |
| rev | line source |
|---|---|
| 282 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
| 282 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
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8 * modify it under the terms of the GNU Lesser General Public License |
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9 * as published by the Free Software Foundation, either version 3 of |
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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 | |
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15 * Lesser General Public License for more details. |
| 282 | 16 * |
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17 * You should have received a copy of the GNU Lesser General Public |
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18 * License along with this program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
| 282 | 20 **/ |
| 21 | |
| 22 | |
| 23 #pragma once | |
| 24 | |
| 25 #include <list> | |
| 26 #include <map> | |
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27 #include <vector> |
| 282 | 28 #include <boost/noncopyable.hpp> |
| 283 | 29 #include <cassert> |
| 30 | |
| 31 #include "../OrthancException.h" | |
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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> | |
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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 | |
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67 void AddOrMakeMostRecent(T id, Payload payload = Payload()); |
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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 **/ | |
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74 void MakeMostRecent(T id); |
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75 |
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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 **/ | |
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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 } | |
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140 |
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141 const T& GetOldest() const; |
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142 |
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143 const Payload& GetOldestPayload() const; |
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144 |
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145 void GetAllKeys(std::vector<T>& keys) const |
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146 { |
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147 keys.clear(); |
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148 keys.reserve(GetSize()); |
| 4199 | 149 for (typename Index::const_iterator it = index_.begin(); it != index_.end(); ++it) |
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150 { |
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151 keys.push_back(it->first); |
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152 } |
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153 } |
| 282 | 154 }; |
| 283 | 155 |
| 156 | |
| 157 | |
| 158 | |
| 159 /****************************************************************** | |
| 160 ** Implementation of the template | |
| 161 ******************************************************************/ | |
| 162 | |
| 163 template <typename T, typename Payload> | |
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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> | |
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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> | |
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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> | |
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216 void LeastRecentlyUsedIndex<T, Payload>::AddOrMakeMostRecent(T id, Payload payload) |
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217 { |
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218 typename Index::iterator it = index_.find(id); |
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219 |
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220 if (it != index_.end()) |
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221 { |
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222 // Already existing. Make it most recent. |
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223 std::pair<T, Payload> item = *(it->second); |
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224 item.second = payload; |
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225 queue_.erase(it->second); |
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226 queue_.push_front(item); |
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227 } |
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228 else |
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229 { |
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230 // New item |
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231 queue_.push_front(std::make_pair(id, payload)); |
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232 } |
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233 |
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234 index_[id] = queue_.begin(); |
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235 |
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236 CheckInvariants(); |
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237 } |
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238 |
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239 |
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240 template <typename T, typename Payload> |
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241 void LeastRecentlyUsedIndex<T, Payload>::MakeMostRecent(T id, Payload updatedPayload) |
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242 { |
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243 if (!Contains(id)) |
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244 { |
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245 throw OrthancException(ErrorCode_InexistentItem); |
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246 } |
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247 |
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248 typename Index::iterator it = index_.find(id); |
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249 assert(it != index_.end()); |
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250 |
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251 std::pair<T, Payload> item = *(it->second); |
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252 item.second = updatedPayload; |
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253 |
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254 queue_.erase(it->second); |
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255 queue_.push_front(item); |
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256 index_[id] = queue_.begin(); |
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257 |
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258 CheckInvariants(); |
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259 } |
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260 |
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261 |
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262 template <typename T, typename Payload> |
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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> | |
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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 } | |
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302 |
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303 |
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304 template <typename T, typename Payload> |
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305 T LeastRecentlyUsedIndex<T, Payload>::RemoveOldest() |
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306 { |
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307 if (IsEmpty()) |
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308 { |
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309 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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310 } |
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311 |
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312 std::pair<T, Payload> item = queue_.back(); |
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313 T oldest = item.first; |
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314 |
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315 queue_.pop_back(); |
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316 assert(index_.find(oldest) != index_.end()); |
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317 index_.erase(oldest); |
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318 |
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319 CheckInvariants(); |
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320 |
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321 return oldest; |
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322 } |
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323 |
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324 |
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325 template <typename T, typename Payload> |
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326 const T& LeastRecentlyUsedIndex<T, Payload>::GetOldest() const |
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327 { |
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328 if (IsEmpty()) |
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329 { |
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330 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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331 } |
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332 |
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333 return queue_.back().first; |
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334 } |
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335 |
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336 |
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337 template <typename T, typename Payload> |
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338 const Payload& LeastRecentlyUsedIndex<T, Payload>::GetOldestPayload() const |
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339 { |
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340 if (IsEmpty()) |
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341 { |
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342 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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343 } |
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344 |
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345 return queue_.back().second; |
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346 } |
| 282 | 347 } |