--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Loaders/BasicFetchingStrategy.h	Mon May 20 11:20:01 2019 +0200
@@ -0,0 +1,94 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 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/>.
+ **/
+
+
+#pragma once
+
+#include "IFetchingItemsSorter.h"
+#include "IFetchingStrategy.h"
+
+#include <memory>
+
+namespace OrthancStone
+{
+  class BasicFetchingStrategy : public IFetchingStrategy
+  {
+  private:
+    class ContentItem
+    {
+    private:
+      unsigned int  item_;
+      unsigned int  quality_;
+
+    public:
+      ContentItem(unsigned int item,
+           unsigned int quality) :
+        item_(item),
+        quality_(quality)
+      {
+      }
+
+      unsigned int GetItem() const
+      {
+        return item_;
+      }
+
+      unsigned int GetQuality() const
+      {
+        return quality_;
+      }
+    };
+
+    std::auto_ptr<IFetchingItemsSorter>  sorter_;
+    std::vector<unsigned int>            nextQuality_;
+    unsigned int                         maxQuality_;
+    std::vector<ContentItem>             content_;
+    size_t                               position_;
+    unsigned int                         blockSize_;
+
+    void Schedule(unsigned int item,
+                  unsigned int quality);
+    
+  public:
+    BasicFetchingStrategy(IFetchingItemsSorter* sorter,   // Takes ownership
+                          unsigned int maxQuality);
+
+    virtual unsigned int GetItemsCount() const
+    {
+      return sorter_->GetItemsCount();
+    }
+
+    virtual unsigned int GetMaxQuality() const
+    {
+      return maxQuality_;
+    }
+
+    // WARNING - This parameters is only considered during the next
+    // call to SetCurrent().
+    void SetBlockSize(unsigned int size);
+
+    virtual bool GetNext(unsigned int& item,
+                         unsigned int& quality);
+    
+    virtual void SetCurrent(unsigned int item);
+
+    virtual void RecycleFurthest(unsigned int& item);
+  };
+}