Mercurial > hg > orthanc-webviewer
annotate Plugin/Cache/CacheScheduler.cpp @ 151:ee5ff71f133b
sync
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 10 Nov 2016 09:58:13 +0100 |
| parents | 70d1fe6d6309 |
| children | 5dc54316d68b |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 122 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
| 0 | 4 * Department, University Hospital of Liege, Belgium |
| 5 * | |
| 6 * This program is free software: you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU Affero General Public License | |
| 8 * as published by the Free Software Foundation, either version 3 of | |
| 9 * the License, or (at your option) any later version. | |
| 10 * | |
| 11 * This program is distributed in the hope that it will be useful, but | |
| 12 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 * Affero General Public License for more details. | |
| 15 * | |
| 16 * You should have received a copy of the GNU Affero General Public License | |
| 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 18 **/ | |
| 19 | |
| 20 | |
| 21 #include "CacheScheduler.h" | |
| 22 | |
| 23 #include "CacheIndex.h" | |
| 24 | |
| 26 | 25 #include "../../Orthanc/Core/OrthancException.h" |
| 0 | 26 #include <stdio.h> |
| 27 | |
| 28 namespace OrthancPlugins | |
| 29 { | |
| 30 class DynamicString : public Orthanc::IDynamicObject | |
| 31 { | |
| 32 private: | |
| 33 std::string value_; | |
| 34 | |
| 35 public: | |
| 36 DynamicString(const std::string& value) : value_(value) | |
| 37 { | |
| 38 } | |
| 39 | |
| 40 const std::string& GetValue() const | |
| 41 { | |
| 42 return value_; | |
| 43 } | |
| 44 }; | |
| 45 | |
| 46 | |
| 47 class CacheScheduler::PrefetchQueue : public boost::noncopyable | |
| 48 { | |
| 49 private: | |
| 50 boost::mutex mutex_; | |
| 51 Orthanc::SharedMessageQueue queue_; | |
| 52 std::set<std::string> content_; | |
| 53 | |
| 54 public: | |
| 55 PrefetchQueue(size_t maxSize) : queue_(maxSize) | |
| 56 { | |
| 57 queue_.SetLifoPolicy(); | |
| 58 } | |
| 59 | |
| 60 void Enqueue(const std::string& item) | |
| 61 { | |
| 62 boost::mutex::scoped_lock lock(mutex_); | |
| 63 | |
| 64 if (content_.find(item) != content_.end()) | |
| 65 { | |
| 66 // This cache index is already pending in the queue | |
| 67 return; | |
| 68 } | |
| 69 | |
| 70 content_.insert(item); | |
| 71 queue_.Enqueue(new DynamicString(item)); | |
| 72 } | |
| 73 | |
| 74 DynamicString* Dequeue(int32_t msTimeout) | |
| 75 { | |
| 76 std::auto_ptr<Orthanc::IDynamicObject> message(queue_.Dequeue(msTimeout)); | |
| 77 if (message.get() == NULL) | |
| 78 { | |
| 79 return NULL; | |
| 80 } | |
| 81 | |
| 82 const DynamicString& index = dynamic_cast<const DynamicString&>(*message); | |
| 83 | |
| 84 { | |
| 85 boost::mutex::scoped_lock lock(mutex_); | |
| 86 content_.erase(index.GetValue()); | |
| 87 } | |
| 88 | |
| 89 return dynamic_cast<DynamicString*>(message.release()); | |
| 90 } | |
| 91 }; | |
| 92 | |
| 93 | |
| 94 class CacheScheduler::Prefetcher : public boost::noncopyable | |
| 95 { | |
| 96 private: | |
| 97 int bundleIndex_; | |
| 98 ICacheFactory& factory_; | |
| 99 CacheManager& cache_; | |
| 100 boost::mutex& cacheMutex_; | |
| 101 PrefetchQueue& queue_; | |
| 102 | |
| 103 bool done_; | |
| 104 boost::thread thread_; | |
| 105 boost::mutex invalidatedMutex_; | |
| 106 bool invalidated_; | |
| 107 std::string prefetching_; | |
| 108 | |
| 109 static void Worker(Prefetcher* that) | |
| 110 { | |
| 111 while (!(that->done_)) | |
| 112 { | |
| 113 std::auto_ptr<DynamicString> prefetch(that->queue_.Dequeue(500)); | |
| 114 | |
|
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115 try |
| 0 | 116 { |
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117 if (prefetch.get() != NULL) |
| 0 | 118 { |
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119 { |
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120 boost::mutex::scoped_lock lock(that->invalidatedMutex_); |
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121 that->invalidated_ = false; |
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122 that->prefetching_ = prefetch->GetValue(); |
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123 } |
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124 |
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125 { |
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126 boost::mutex::scoped_lock lock(that->cacheMutex_); |
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127 if (that->cache_.IsCached(that->bundleIndex_, prefetch->GetValue())) |
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128 { |
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129 // This item is already cached |
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130 continue; |
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131 } |
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132 } |
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133 |
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134 std::string content; |
| 0 | 135 |
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136 try |
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137 { |
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138 if (!that->factory_.Create(content, prefetch->GetValue())) |
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139 { |
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140 // The factory cannot generate this item |
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141 continue; |
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142 } |
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143 } |
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144 catch (...) |
| 0 | 145 { |
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146 // Exception |
| 0 | 147 continue; |
| 148 } | |
|
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149 |
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150 { |
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151 boost::mutex::scoped_lock lock(that->invalidatedMutex_); |
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152 if (that->invalidated_) |
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153 { |
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154 // This item has been invalidated |
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155 continue; |
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156 } |
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157 |
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158 { |
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159 boost::mutex::scoped_lock lock2(that->cacheMutex_); |
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160 that->cache_.Store(that->bundleIndex_, prefetch->GetValue(), content); |
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161 } |
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162 } |
| 0 | 163 } |
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164 } |
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165 catch (std::bad_alloc&) |
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166 { |
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167 OrthancPluginLogError(that->cache_.GetPluginContext(), |
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168 "Not enough memory for the prefetcher of the Web viewer to work"); |
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169 } |
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170 catch (...) |
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171 { |
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172 OrthancPluginLogError(that->cache_.GetPluginContext(), |
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173 "Unhandled native exception inside the prefetcher of the Web viewer"); |
| 0 | 174 } |
| 175 } | |
| 176 } | |
| 177 | |
| 178 | |
| 179 public: | |
| 180 Prefetcher(int bundleIndex, | |
| 181 ICacheFactory& factory, | |
| 182 CacheManager& cache, | |
| 183 boost::mutex& cacheMutex, | |
| 184 PrefetchQueue& queue) : | |
| 185 bundleIndex_(bundleIndex), | |
| 186 factory_(factory), | |
| 187 cache_(cache), | |
| 188 cacheMutex_(cacheMutex), | |
| 189 queue_(queue) | |
| 190 { | |
| 191 done_ = false; | |
| 192 thread_ = boost::thread(Worker, this); | |
| 193 } | |
| 194 | |
| 195 ~Prefetcher() | |
| 196 { | |
| 197 done_ = true; | |
| 198 if (thread_.joinable()) | |
| 199 { | |
| 200 thread_.join(); | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 void SignalInvalidated(const std::string& item) | |
| 205 { | |
| 206 boost::mutex::scoped_lock lock(invalidatedMutex_); | |
| 207 | |
| 208 if (prefetching_ == item) | |
| 209 { | |
| 210 invalidated_ = true; | |
| 211 } | |
| 212 } | |
| 213 }; | |
| 214 | |
| 215 | |
| 216 | |
| 217 class CacheScheduler::BundleScheduler | |
| 218 { | |
| 219 private: | |
| 220 std::auto_ptr<ICacheFactory> factory_; | |
| 221 PrefetchQueue queue_; | |
| 222 std::vector<Prefetcher*> prefetchers_; | |
| 223 | |
| 224 public: | |
| 225 BundleScheduler(int bundleIndex, | |
| 226 ICacheFactory* factory, | |
| 227 CacheManager& cache, | |
| 228 boost::mutex& cacheMutex, | |
| 229 size_t numThreads, | |
| 230 size_t queueSize) : | |
| 231 factory_(factory), | |
| 232 queue_(queueSize) | |
| 233 { | |
| 234 prefetchers_.resize(numThreads, NULL); | |
| 235 | |
| 236 for (size_t i = 0; i < numThreads; i++) | |
| 237 { | |
| 238 prefetchers_[i] = new Prefetcher(bundleIndex, *factory_, cache, cacheMutex, queue_); | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 ~BundleScheduler() | |
| 243 { | |
| 244 for (size_t i = 0; i < prefetchers_.size(); i++) | |
| 245 { | |
| 246 if (prefetchers_[i] != NULL) | |
| 247 delete prefetchers_[i]; | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 void Invalidate(const std::string& item) | |
| 252 { | |
| 253 for (size_t i = 0; i < prefetchers_.size(); i++) | |
| 254 { | |
| 255 prefetchers_[i]->SignalInvalidated(item); | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 void Prefetch(const std::string& item) | |
| 260 { | |
| 261 queue_.Enqueue(item); | |
| 262 } | |
| 263 | |
| 264 bool CallFactory(std::string& content, | |
| 265 const std::string& item) | |
| 266 { | |
| 267 content.clear(); | |
| 268 return factory_->Create(content, item); | |
| 269 } | |
| 96 | 270 |
| 271 ICacheFactory& GetFactory() | |
| 272 { | |
| 273 return *factory_; | |
| 274 } | |
| 0 | 275 }; |
| 276 | |
| 277 | |
| 278 | |
| 279 CacheScheduler::BundleScheduler& CacheScheduler::GetBundleScheduler(unsigned int bundleIndex) | |
| 280 { | |
| 281 boost::mutex::scoped_lock lock(factoryMutex_); | |
| 282 | |
| 283 BundleSchedulers::iterator it = bundles_.find(bundleIndex); | |
| 284 if (it == bundles_.end()) | |
| 285 { | |
| 79 | 286 // No factory associated with this bundle |
| 287 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); | |
| 0 | 288 } |
| 289 | |
| 290 return *(it->second); | |
| 291 } | |
| 292 | |
| 293 | |
| 294 | |
| 295 CacheScheduler::CacheScheduler(CacheManager& cache, | |
| 296 unsigned int maxPrefetchSize) : | |
| 297 maxPrefetchSize_(maxPrefetchSize), | |
| 298 cache_(cache), | |
| 299 policy_(NULL) | |
| 300 { | |
| 301 } | |
| 302 | |
| 303 | |
| 304 CacheScheduler::~CacheScheduler() | |
| 305 { | |
| 306 for (BundleSchedulers::iterator it = bundles_.begin(); | |
| 307 it != bundles_.end(); it++) | |
| 308 { | |
| 309 delete it->second; | |
| 310 } | |
| 311 } | |
| 312 | |
| 313 | |
| 314 void CacheScheduler::Register(int bundle, | |
| 315 ICacheFactory* factory /* takes ownership */, | |
| 316 size_t numThreads) | |
| 317 { | |
| 318 boost::mutex::scoped_lock lock(factoryMutex_); | |
| 319 | |
| 320 BundleSchedulers::iterator it = bundles_.find(bundle); | |
| 321 if (it != bundles_.end()) | |
| 322 { | |
| 323 // This bundle is already registered | |
| 324 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 325 } | |
| 326 | |
| 327 bundles_[bundle] = new BundleScheduler(bundle, factory, cache_, cacheMutex_, numThreads, maxPrefetchSize_); | |
| 328 } | |
| 329 | |
| 330 | |
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331 void CacheScheduler::SetQuota(int bundle, |
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332 uint32_t maxCount, |
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333 uint64_t maxSpace) |
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334 { |
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335 boost::mutex::scoped_lock lock(cacheMutex_); |
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336 cache_.SetBundleQuota(bundle, maxCount, maxSpace); |
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337 } |
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338 |
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339 |
| 0 | 340 void CacheScheduler::Invalidate(int bundle, |
| 341 const std::string& item) | |
| 342 { | |
| 343 { | |
| 344 boost::mutex::scoped_lock lock(cacheMutex_); | |
| 345 cache_.Invalidate(bundle, item); | |
| 346 } | |
| 347 | |
| 348 GetBundleScheduler(bundle).Invalidate(item); | |
| 349 } | |
| 350 | |
| 351 | |
| 352 void CacheScheduler::ApplyPrefetchPolicy(int bundle, | |
| 353 const std::string& item, | |
| 354 const std::string& content) | |
| 355 { | |
| 356 boost::recursive_mutex::scoped_lock lock(policyMutex_); | |
| 357 | |
| 358 if (policy_.get() != NULL) | |
| 359 { | |
| 360 std::list<CacheIndex> toPrefetch; | |
| 361 | |
| 362 { | |
| 363 policy_->Apply(toPrefetch, *this, CacheIndex(bundle, item), content); | |
| 364 } | |
| 365 | |
| 366 for (std::list<CacheIndex>::const_reverse_iterator | |
| 367 it = toPrefetch.rbegin(); it != toPrefetch.rend(); ++it) | |
| 368 { | |
| 369 Prefetch(it->GetBundle(), it->GetItem()); | |
| 370 } | |
| 371 } | |
| 372 } | |
| 373 | |
| 374 | |
| 375 bool CacheScheduler::Access(std::string& content, | |
| 376 int bundle, | |
| 377 const std::string& item) | |
| 378 { | |
| 379 bool existing; | |
| 380 | |
| 381 { | |
| 382 boost::mutex::scoped_lock lock(cacheMutex_); | |
| 383 existing = cache_.Access(content, bundle, item); | |
| 384 } | |
| 385 | |
| 386 if (existing) | |
| 387 { | |
| 388 ApplyPrefetchPolicy(bundle, item, content); | |
| 389 return true; | |
| 390 } | |
| 391 | |
| 392 if (!GetBundleScheduler(bundle).CallFactory(content, item)) | |
| 393 { | |
| 394 // This item cannot be generated by the factory | |
| 395 return false; | |
| 396 } | |
| 397 | |
| 398 { | |
| 399 boost::mutex::scoped_lock lock(cacheMutex_); | |
| 400 cache_.Store(bundle, item, content); | |
| 401 } | |
| 402 | |
| 403 ApplyPrefetchPolicy(bundle, item, content); | |
| 404 | |
| 405 return true; | |
| 406 } | |
| 407 | |
| 408 | |
| 409 void CacheScheduler::Prefetch(int bundle, | |
| 410 const std::string& item) | |
| 411 { | |
| 412 GetBundleScheduler(bundle).Prefetch(item); | |
| 413 } | |
| 414 | |
| 415 | |
| 416 void CacheScheduler::RegisterPolicy(IPrefetchPolicy* policy) | |
| 417 { | |
| 418 boost::recursive_mutex::scoped_lock lock(policyMutex_); | |
| 419 policy_.reset(policy); | |
| 420 } | |
| 421 | |
| 96 | 422 |
| 423 ICacheFactory& CacheScheduler::GetFactory(int bundle) | |
| 424 { | |
| 425 return GetBundleScheduler(bundle).GetFactory(); | |
| 426 } | |
|
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427 |
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428 |
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429 void CacheScheduler::SetProperty(CacheProperty property, |
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430 const std::string& value) |
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431 { |
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432 boost::mutex::scoped_lock lock(cacheMutex_); |
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433 cache_.SetProperty(property, value); |
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434 } |
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435 |
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436 |
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437 bool CacheScheduler::LookupProperty(std::string& target, |
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438 CacheProperty property) |
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439 { |
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440 boost::mutex::scoped_lock lock(cacheMutex_); |
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441 return cache_.LookupProperty(target, property); |
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442 } |
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443 |
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444 |
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445 void CacheScheduler::Clear() |
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446 { |
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447 boost::mutex::scoped_lock lock(cacheMutex_); |
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448 return cache_.Clear(); |
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449 } |
| 0 | 450 } |