--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Toolbox/ParsedDicomCache.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,143 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "ParsedDicomCache.h"
+
+namespace OrthancStone
+{
+  class ParsedDicomCache::Item : public Orthanc::ICacheable
+  {
+  private:
+    std::unique_ptr<Orthanc::ParsedDicomFile>  dicom_;
+    size_t                                   fileSize_;
+    bool                                     hasPixelData_;
+    
+  public:
+    Item(Orthanc::ParsedDicomFile* dicom,
+         size_t fileSize,
+         bool hasPixelData) :
+      dicom_(dicom),
+      fileSize_(fileSize),
+      hasPixelData_(hasPixelData)
+    {
+      if (dicom == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+      }
+    }
+           
+    virtual size_t GetMemoryUsage() const
+    {
+      return fileSize_;
+    }
+
+    Orthanc::ParsedDicomFile& GetDicom() const
+    {
+      assert(dicom_.get() != NULL);
+      return *dicom_;
+    }
+
+    bool HasPixelData() const
+    {
+      return hasPixelData_;
+    }
+  };
+    
+
+  std::string ParsedDicomCache::GetIndex(unsigned int bucket,
+                                         const std::string& bucketKey)
+  {
+    return boost::lexical_cast<std::string>(bucket) + "|" + bucketKey;
+  }
+  
+
+  void ParsedDicomCache::Acquire(unsigned int bucket,
+                                 const std::string& bucketKey,
+                                 Orthanc::ParsedDicomFile* dicom,
+                                 size_t fileSize,
+                                 bool hasPixelData)
+  {
+    LOG(TRACE) << "new item stored in cache: bucket " << bucket << ", key " << bucketKey;
+    cache_.Acquire(GetIndex(bucket, bucketKey), new Item(dicom, fileSize, hasPixelData));
+  }
+
+  
+  ParsedDicomCache::Reader::Reader(ParsedDicomCache& cache,
+                                   unsigned int bucket,
+                                   const std::string& bucketKey) :
+    /**
+     * The "DcmFileFormat" object cannot be accessed from multiple
+     * threads, even if using only getters. An unique lock (mutex) is
+     * mandatory.
+     **/
+    accessor_(cache.cache_, GetIndex(bucket, bucketKey), true /* unique */)
+  {
+    if (accessor_.IsValid())
+    {
+      LOG(TRACE) << "accessing item within cache: bucket " << bucket << ", key " << bucketKey;
+      item_ = &dynamic_cast<Item&>(accessor_.GetValue());
+    }
+    else
+    {
+      LOG(TRACE) << "missing item within cache: bucket " << bucket << ", key " << bucketKey;
+      item_ = NULL;
+    }
+  }
+
+
+  bool ParsedDicomCache::Reader::HasPixelData() const
+  {
+    if (item_ == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+    }
+    else
+    {
+      return item_->HasPixelData();
+    }
+  }
+
+  
+  Orthanc::ParsedDicomFile& ParsedDicomCache::Reader::GetDicom() const
+  {
+    if (item_ == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+    }
+    else
+    {
+      return item_->GetDicom();
+    }
+  }
+
+  
+  size_t ParsedDicomCache::Reader::GetFileSize() const
+  {
+    if (item_ == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+    }
+    else
+    {
+      return item_->GetMemoryUsage();
+    }
+  }
+}