Mercurial > hg > orthanc
annotate Core/Cache/LeastRecentlyUsedIndex.h @ 3501:27b53c61aa99
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Sat, 24 Aug 2019 15:40:36 +0200 |
| parents | 8c663bbe5363 |
| children | 94f4a18a79cc |
| rev | line source |
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| 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) 2017-2019 Osimis S.A., Belgium |
| 282 | 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 <list> | |
| 37 #include <map> | |
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38 #include <vector> |
| 282 | 39 #include <boost/noncopyable.hpp> |
| 283 | 40 #include <cassert> |
| 41 | |
| 42 #include "../OrthancException.h" | |
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43 #include "../Toolbox.h" |
| 282 | 44 |
| 45 namespace Orthanc | |
| 46 { | |
| 47 /** | |
| 48 * This class implements the index of a cache with least recently | |
| 49 * used (LRU) recycling policy. All the items of the cache index | |
| 50 * can be associated with a payload. | |
| 51 * Reference: http://stackoverflow.com/a/2504317 | |
| 52 **/ | |
| 53 template <typename T, typename Payload = NullType> | |
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54 class LeastRecentlyUsedIndex : public boost::noncopyable |
| 282 | 55 { |
| 56 private: | |
| 57 typedef std::list< std::pair<T, Payload> > Queue; | |
| 58 typedef std::map<T, typename Queue::iterator> Index; | |
| 59 | |
| 60 Index index_; | |
| 61 Queue queue_; | |
| 62 | |
| 63 /** | |
| 64 * Internal method for debug builds to check whether the internal | |
| 65 * data structures are not corrupted. | |
| 66 **/ | |
| 67 void CheckInvariants() const; | |
| 68 | |
| 69 public: | |
| 70 /** | |
| 71 * Add a new element to the cache index, and make it the most | |
| 72 * recent element. | |
| 73 * \param id The ID of the element. | |
| 74 * \param payload The payload of the element. | |
| 75 **/ | |
| 76 void Add(T id, Payload payload = Payload()); | |
| 77 | |
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78 void AddOrMakeMostRecent(T id, Payload payload = Payload()); |
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79 |
| 282 | 80 /** |
| 81 * When accessing an element of the cache, this method tags the | |
| 82 * element as the most recently used. | |
| 83 * \param id The most recently accessed item. | |
| 84 **/ | |
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85 void MakeMostRecent(T id); |
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86 |
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87 void MakeMostRecent(T id, Payload updatedPayload); |
| 282 | 88 |
| 89 /** | |
| 90 * Remove an element from the cache index. | |
| 91 * \param id The item to remove. | |
| 92 **/ | |
| 93 Payload Invalidate(T id); | |
| 94 | |
| 95 /** | |
| 96 * Get the oldest element in the cache and remove it. | |
| 97 * \return The oldest item. | |
| 98 **/ | |
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99 T RemoveOldest(); |
| 282 | 100 |
| 101 /** | |
| 102 * Get the oldest element in the cache, remove it and return the | |
| 103 * associated payload. | |
| 104 * \param payload Where to store the associated payload. | |
| 105 * \return The oldest item. | |
| 106 **/ | |
| 107 T RemoveOldest(Payload& payload); | |
| 108 | |
| 109 /** | |
| 110 * Check whether an element is contained in the cache. | |
| 111 * \param id The item. | |
| 112 * \return \c true iff the item is indexed by the cache. | |
| 113 **/ | |
| 114 bool Contains(T id) const | |
| 115 { | |
| 116 return index_.find(id) != index_.end(); | |
| 117 } | |
| 118 | |
| 283 | 119 bool Contains(T id, Payload& payload) const |
| 120 { | |
| 121 typename Index::const_iterator it = index_.find(id); | |
| 122 if (it == index_.end()) | |
| 123 { | |
| 124 return false; | |
| 125 } | |
| 126 else | |
| 127 { | |
| 128 payload = it->second->second; | |
| 129 return true; | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 /** | |
| 134 * Return the number of elements in the cache. | |
| 135 * \return The number of elements. | |
| 136 **/ | |
| 137 size_t GetSize() const | |
| 138 { | |
| 139 assert(index_.size() == queue_.size()); | |
| 140 return queue_.size(); | |
| 141 } | |
| 142 | |
| 282 | 143 /** |
| 144 * Check whether the cache index is empty. | |
| 145 * \return \c true iff the cache is empty. | |
| 146 **/ | |
| 147 bool IsEmpty() const | |
| 148 { | |
| 149 return index_.empty(); | |
| 150 } | |
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151 |
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152 const T& GetOldest() const; |
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153 |
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154 const Payload& GetOldestPayload() const; |
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155 |
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156 void GetAllKeys(std::vector<T>& keys) const |
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157 { |
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158 keys.clear(); |
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159 keys.reserve(GetSize()); |
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160 for (typename Index::const_iterator it = index_.begin(); it != index_.end(); it++) |
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161 { |
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162 keys.push_back(it->first); |
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163 } |
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164 } |
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165 |
| 282 | 166 }; |
| 283 | 167 |
| 168 | |
| 169 | |
| 170 | |
| 171 /****************************************************************** | |
| 172 ** Implementation of the template | |
| 173 ******************************************************************/ | |
| 174 | |
| 175 template <typename T, typename Payload> | |
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176 void LeastRecentlyUsedIndex<T, Payload>::CheckInvariants() const |
| 283 | 177 { |
| 178 #ifndef NDEBUG | |
| 179 assert(index_.size() == queue_.size()); | |
| 180 | |
| 181 for (typename Index::const_iterator | |
| 182 it = index_.begin(); it != index_.end(); it++) | |
| 183 { | |
| 184 assert(it->second != queue_.end()); | |
| 185 assert(it->second->first == it->first); | |
| 186 } | |
| 187 #endif | |
| 188 } | |
| 189 | |
| 190 | |
| 191 template <typename T, typename Payload> | |
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192 void LeastRecentlyUsedIndex<T, Payload>::Add(T id, Payload payload) |
| 283 | 193 { |
| 194 if (Contains(id)) | |
| 195 { | |
| 196 throw OrthancException(ErrorCode_BadSequenceOfCalls); | |
| 197 } | |
| 198 | |
| 199 queue_.push_front(std::make_pair(id, payload)); | |
| 200 index_[id] = queue_.begin(); | |
| 201 | |
| 202 CheckInvariants(); | |
| 203 } | |
| 204 | |
| 205 | |
| 206 template <typename T, typename Payload> | |
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207 void LeastRecentlyUsedIndex<T, Payload>::MakeMostRecent(T id) |
| 283 | 208 { |
| 209 if (!Contains(id)) | |
| 210 { | |
| 211 throw OrthancException(ErrorCode_InexistentItem); | |
| 212 } | |
| 213 | |
| 214 typename Index::iterator it = index_.find(id); | |
| 215 assert(it != index_.end()); | |
| 216 | |
| 217 std::pair<T, Payload> item = *(it->second); | |
| 218 | |
| 219 queue_.erase(it->second); | |
| 220 queue_.push_front(item); | |
| 221 index_[id] = queue_.begin(); | |
| 222 | |
| 223 CheckInvariants(); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 template <typename T, typename Payload> | |
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228 void LeastRecentlyUsedIndex<T, Payload>::AddOrMakeMostRecent(T id, Payload payload) |
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229 { |
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230 typename Index::iterator it = index_.find(id); |
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231 |
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232 if (it != index_.end()) |
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233 { |
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234 // Already existing. Make it most recent. |
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235 std::pair<T, Payload> item = *(it->second); |
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236 item.second = payload; |
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237 queue_.erase(it->second); |
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238 queue_.push_front(item); |
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239 } |
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240 else |
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241 { |
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242 // New item |
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243 queue_.push_front(std::make_pair(id, payload)); |
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244 } |
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245 |
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246 index_[id] = queue_.begin(); |
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247 |
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248 CheckInvariants(); |
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249 } |
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250 |
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251 |
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252 template <typename T, typename Payload> |
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253 void LeastRecentlyUsedIndex<T, Payload>::MakeMostRecent(T id, Payload updatedPayload) |
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254 { |
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255 if (!Contains(id)) |
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256 { |
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257 throw OrthancException(ErrorCode_InexistentItem); |
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258 } |
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259 |
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260 typename Index::iterator it = index_.find(id); |
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261 assert(it != index_.end()); |
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262 |
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263 std::pair<T, Payload> item = *(it->second); |
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264 item.second = updatedPayload; |
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265 |
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266 queue_.erase(it->second); |
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267 queue_.push_front(item); |
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268 index_[id] = queue_.begin(); |
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269 |
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270 CheckInvariants(); |
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271 } |
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272 |
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273 |
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274 template <typename T, typename Payload> |
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275 Payload LeastRecentlyUsedIndex<T, Payload>::Invalidate(T id) |
| 283 | 276 { |
| 277 if (!Contains(id)) | |
| 278 { | |
| 279 throw OrthancException(ErrorCode_InexistentItem); | |
| 280 } | |
| 281 | |
| 282 typename Index::iterator it = index_.find(id); | |
| 283 assert(it != index_.end()); | |
| 284 | |
| 285 Payload payload = it->second->second; | |
| 286 queue_.erase(it->second); | |
| 287 index_.erase(it); | |
| 288 | |
| 289 CheckInvariants(); | |
| 290 return payload; | |
| 291 } | |
| 292 | |
| 293 | |
| 294 template <typename T, typename Payload> | |
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295 T LeastRecentlyUsedIndex<T, Payload>::RemoveOldest(Payload& payload) |
| 283 | 296 { |
| 297 if (IsEmpty()) | |
| 298 { | |
| 299 throw OrthancException(ErrorCode_BadSequenceOfCalls); | |
| 300 } | |
| 301 | |
| 302 std::pair<T, Payload> item = queue_.back(); | |
| 303 T oldest = item.first; | |
| 304 payload = item.second; | |
| 305 | |
| 306 queue_.pop_back(); | |
| 307 assert(index_.find(oldest) != index_.end()); | |
| 308 index_.erase(oldest); | |
| 309 | |
| 310 CheckInvariants(); | |
| 311 | |
| 312 return oldest; | |
| 313 } | |
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314 |
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315 |
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316 template <typename T, typename Payload> |
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317 T LeastRecentlyUsedIndex<T, Payload>::RemoveOldest() |
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318 { |
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319 if (IsEmpty()) |
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320 { |
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321 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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322 } |
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323 |
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324 std::pair<T, Payload> item = queue_.back(); |
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325 T oldest = item.first; |
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326 |
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327 queue_.pop_back(); |
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328 assert(index_.find(oldest) != index_.end()); |
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329 index_.erase(oldest); |
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330 |
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331 CheckInvariants(); |
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332 |
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333 return oldest; |
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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 T& LeastRecentlyUsedIndex<T, Payload>::GetOldest() 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().first; |
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346 } |
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347 |
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348 |
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349 template <typename T, typename Payload> |
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350 const Payload& LeastRecentlyUsedIndex<T, Payload>::GetOldestPayload() const |
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351 { |
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352 if (IsEmpty()) |
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353 { |
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354 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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355 } |
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356 |
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357 return queue_.back().second; |
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358 } |
| 282 | 359 } |