--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/OrthancInstancesCache.h	Mon Sep 17 11:34:55 2018 +0200
@@ -0,0 +1,113 @@
+/**
+ * Transfers accelerator plugin for Orthanc
+ * Copyright (C) 2018 Osimis, 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/>.
+ **/
+
+
+#pragma once
+
+#include "SourceDicomInstance.h"
+#include "TransferBucket.h"
+
+#include <Core/Cache/LeastRecentlyUsedIndex.h>
+
+#include <boost/thread/mutex.hpp>
+
+namespace OrthancPlugins
+{
+  class OrthancInstancesCache : public boost::noncopyable
+  {
+  private:
+    class CacheAccessor : public boost::noncopyable
+    {
+    private:
+      boost::mutex::scoped_lock  lock_;
+      SourceDicomInstance       *instance_;
+
+      void CheckValid() const;
+      
+    public:
+      CacheAccessor(OrthancInstancesCache& cache,
+                    const std::string& instanceId);
+
+      bool IsValid() const
+      {
+        return instance_ != NULL;
+      }
+
+      const DicomInstanceInfo& GetInfo() const;
+
+      void GetChunk(std::string& chunk,
+                    std::string& md5,
+                    size_t offset,
+                    size_t size);
+    };
+
+    
+    typedef Orthanc::LeastRecentlyUsedIndex<std::string>  Index;
+    typedef std::map<std::string, SourceDicomInstance*>   Content;
+
+    OrthancPluginContext*  context_;
+    boost::mutex           mutex_;
+    Index                  index_;
+    Content                content_;
+    size_t                 memorySize_;
+    size_t                 maxMemorySize_;
+
+
+    // The mutex must be locked!
+    void CheckInvariants();
+    
+    // The mutex must be locked!
+    void RemoveOldest();
+
+    // The mutex must be locked!
+    void Store(const std::string& instanceId,
+               std::auto_ptr<SourceDicomInstance>& instance);
+    
+
+  public:
+    OrthancInstancesCache(OrthancPluginContext* context);
+
+    ~OrthancInstancesCache();
+
+    OrthancPluginContext* GetContext() const
+    {
+      return context_;
+    }    
+
+    size_t GetMemorySize();
+
+    size_t GetMaxMemorySize();
+
+    void SetMaxMemorySize(size_t size);
+    
+    void GetInstanceInfo(size_t& size,
+                         std::string& md5,
+                         const std::string& instanceId);
+    
+    void GetChunk(std::string& chunk,
+                  std::string& md5,
+                  const std::string& instanceId,
+                  size_t offset,
+                  size_t size);
+
+    void GetChunk(std::string& chunk,
+                  std::string& md5,
+                  const TransferBucket& bucket,
+                  size_t chunkIndex);
+  };
+}