--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Core/Cache/SharedArchive.h	Fri May 22 17:40:10 2015 +0200
@@ -0,0 +1,87 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2015 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 General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "LeastRecentlyUsedIndex.h"
+#include "../IDynamicObject.h"
+
+#include <map>
+#include <boost/thread.hpp>
+
+namespace Orthanc
+{
+  class SharedArchive : public boost::noncopyable
+  {
+  private:
+    typedef std::map<std::string, IDynamicObject*>  Archive;
+
+    size_t         maxSize_;
+    boost::mutex   mutex_;
+    Archive        archive_;
+    Orthanc::LeastRecentlyUsedIndex<std::string> lru_;
+
+    void RemoveInternal(const std::string& id);
+
+  public:
+    class Accessor : public boost::noncopyable
+    {
+    private:
+      boost::mutex::scoped_lock  lock_;
+      IDynamicObject*            item_;
+
+    public:
+      Accessor(SharedArchive& that,
+               const std::string& id);
+
+      IDynamicObject& GetItem() const
+      {
+        return *item_;
+      }      
+    };
+
+
+    SharedArchive(size_t maxSize) : maxSize_(maxSize)
+    {
+    }
+
+    ~SharedArchive();
+
+    std::string Add(IDynamicObject* obj);  // Takes the ownership
+
+    void Remove(const std::string& id);
+
+    void List(std::list<std::string>& items);
+  };
+}
+
+