Mercurial > hg > orthanc
annotate Core/Cache/LeastRecentlyUsedIndex.h @ 2447:878b59270859
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 02 Jan 2018 09:35:07 +0100 |
| parents | a3a65de1840f |
| children | 4e43e67f8ecf |
| 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) 2017-2018 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> | |
| 38 #include <boost/noncopyable.hpp> | |
| 283 | 39 #include <cassert> |
| 40 | |
| 41 #include "../OrthancException.h" | |
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42 #include "../Toolbox.h" |
| 282 | 43 |
| 44 namespace Orthanc | |
| 45 { | |
| 46 /** | |
| 47 * This class implements the index of a cache with least recently | |
| 48 * used (LRU) recycling policy. All the items of the cache index | |
| 49 * can be associated with a payload. | |
| 50 * Reference: http://stackoverflow.com/a/2504317 | |
| 51 **/ | |
| 52 template <typename T, typename Payload = NullType> | |
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53 class LeastRecentlyUsedIndex : public boost::noncopyable |
| 282 | 54 { |
| 55 private: | |
| 56 typedef std::list< std::pair<T, Payload> > Queue; | |
| 57 typedef std::map<T, typename Queue::iterator> Index; | |
| 58 | |
| 59 Index index_; | |
| 60 Queue queue_; | |
| 61 | |
| 62 /** | |
| 63 * Internal method for debug builds to check whether the internal | |
| 64 * data structures are not corrupted. | |
| 65 **/ | |
| 66 void CheckInvariants() const; | |
| 67 | |
| 68 public: | |
| 69 /** | |
| 70 * Add a new element to the cache index, and make it the most | |
| 71 * recent element. | |
| 72 * \param id The ID of the element. | |
| 73 * \param payload The payload of the element. | |
| 74 **/ | |
| 75 void Add(T id, Payload payload = Payload()); | |
| 76 | |
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77 void AddOrMakeMostRecent(T id, Payload payload = Payload()); |
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78 |
| 282 | 79 /** |
| 80 * When accessing an element of the cache, this method tags the | |
| 81 * element as the most recently used. | |
| 82 * \param id The most recently accessed item. | |
| 83 **/ | |
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84 void MakeMostRecent(T id); |
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85 |
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86 void MakeMostRecent(T id, Payload updatedPayload); |
| 282 | 87 |
| 88 /** | |
| 89 * Remove an element from the cache index. | |
| 90 * \param id The item to remove. | |
| 91 **/ | |
| 92 Payload Invalidate(T id); | |
| 93 | |
| 94 /** | |
| 95 * Get the oldest element in the cache and remove it. | |
| 96 * \return The oldest item. | |
| 97 **/ | |
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98 T RemoveOldest(); |
| 282 | 99 |
| 100 /** | |
| 101 * Get the oldest element in the cache, remove it and return the | |
| 102 * associated payload. | |
| 103 * \param payload Where to store the associated payload. | |
| 104 * \return The oldest item. | |
| 105 **/ | |
| 106 T RemoveOldest(Payload& payload); | |
| 107 | |
| 108 /** | |
| 109 * Check whether an element is contained in the cache. | |
| 110 * \param id The item. | |
| 111 * \return \c true iff the item is indexed by the cache. | |
| 112 **/ | |
| 113 bool Contains(T id) const | |
| 114 { | |
| 115 return index_.find(id) != index_.end(); | |
| 116 } | |
| 117 | |
| 283 | 118 bool Contains(T id, Payload& payload) const |
| 119 { | |
| 120 typename Index::const_iterator it = index_.find(id); | |
| 121 if (it == index_.end()) | |
| 122 { | |
| 123 return false; | |
| 124 } | |
| 125 else | |
| 126 { | |
| 127 payload = it->second->second; | |
| 128 return true; | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 /** | |
| 133 * Return the number of elements in the cache. | |
| 134 * \return The number of elements. | |
| 135 **/ | |
| 136 size_t GetSize() const | |
| 137 { | |
| 138 assert(index_.size() == queue_.size()); | |
| 139 return queue_.size(); | |
| 140 } | |
| 141 | |
| 282 | 142 /** |
| 143 * Check whether the cache index is empty. | |
| 144 * \return \c true iff the cache is empty. | |
| 145 **/ | |
| 146 bool IsEmpty() const | |
| 147 { | |
| 148 return index_.empty(); | |
| 149 } | |
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150 |
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151 const T& GetOldest() const; |
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152 |
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153 const Payload& GetOldestPayload() const; |
| 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 | |
| 170 it = index_.begin(); it != index_.end(); it++) | |
| 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 } |