--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ViewerPlugin/DicomPyramidCache.h	Mon Nov 28 16:51:19 2016 +0100
@@ -0,0 +1,70 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, 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 "../Framework/Inputs/DicomPyramid.h"
+#include "../Resources/Orthanc/Core/Cache/LeastRecentlyUsedIndex.h"
+
+#include <boost/thread/mutex.hpp>
+
+namespace OrthancWSI
+{
+  class DicomPyramidCache : public boost::noncopyable
+  {
+  private:
+    typedef Orthanc::LeastRecentlyUsedIndex<std::string, DicomPyramid*>  Cache;
+
+    boost::mutex                         mutex_;
+    OrthancPlugins::IOrthancConnection&  orthanc_;
+    size_t                               maxSize_;
+    Cache                                cache_;
+
+
+    DicomPyramid* GetCachedPyramid(const std::string& seriesId);
+
+    DicomPyramid& GetPyramid(const std::string& seriesId,
+                             boost::mutex::scoped_lock& lock);
+
+  public:
+    DicomPyramidCache(OrthancPlugins::IOrthancConnection& orthanc,
+                      size_t maxSize);
+
+    ~DicomPyramidCache();
+
+    void Invalidate(const std::string& seriesId);
+
+    class Locker : public boost::noncopyable
+    {
+    private:
+      boost::mutex::scoped_lock  lock_;
+      DicomPyramid&              pyramid_;
+
+    public:
+      Locker(DicomPyramidCache& cache,
+             const std::string& seriesId);
+
+      DicomPyramid& GetPyramid() const
+      {
+        return pyramid_;
+      }
+    };
+  };
+}