1 files changed, 102 insertions, 0 deletions
diff --git a/lib/cppparser/cachemanager.h b/lib/cppparser/cachemanager.h
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+++ b/lib/cppparser/cachemanager.h
@@ -0,0 +1,102 @@
+
+/***************************************************************************
+   copyright            : (C) 2006 by David Nolden
+   email                : [email protected]
+***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   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 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef CACHEMANAGER_H
+#define CACHEMANAGER_H
+#include <cstdlib>
+#include <set>
+#include <limits>
+
+class CacheManager;
+
+
+class CacheNode {
+  typedef CacheManager Manager;
+  public:
+  CacheNode( Manager* manager );
+  
+  virtual ~CacheNode();
+
+  void access() const;
+
+  inline uint value() const {
+    return m_value;
+  }
+
+  inline void setValue( const uint v ) const {
+    m_value = v;
+  }
+
+  inline void addValue( const uint diff ) const {
+    m_value += diff;
+  }
+  
+  private:
+    Manager* m_manager;
+    mutable uint m_value; //This value stands for the priority of the node(higher is better)
+};
+
+class CacheNodeCompare {
+  public:
+  bool operator() ( const CacheNode* lhs, const CacheNode* rhs ) const {
+    if( lhs->value() != rhs->value() )
+      return lhs->value() < rhs->value();
+    else
+      return lhs < rhs; //To be able to identify nodes precisely
+  }
+};
+
+
+class CacheManager {
+  typedef std::set< const CacheNode*, CacheNodeCompare > SetType;
+  public:
+    CacheManager( int maxNodes = 1000 ) : m_currentFrame(1), m_maxNodes( maxNodes ), m_currentMax(1) {
+    };
+
+    inline int currentFrame() const {
+      return m_currentFrame;
+    }
+
+    void access( const CacheNode* node );
+
+    ///Can be used from outside to set the maximum count of nodes to keep.
+    void setMaxNodes ( int maxNodes );
+
+    void increaseFrame();
+
+    ///Can be used on a regular basis(time-triggered) to save memory: Removes half of all triggered 
+    void removeLowerHalf();
+
+    virtual void saveMemory();
+
+    int currentMax() const {
+      return m_currentMax;
+    }
+
+    ///This triggered function should erase the given node.
+    virtual void erase( const CacheNode* node ) = 0;
+  private:
+    void restart( uint normalizeby );
+    friend class CacheNode;
+    void remove( const CacheNode* node );
+    void add( const CacheNode* node );
+    int m_currentFrame;
+    int m_maxNodes;
+    int m_currentMax;
+    SetType m_set;
+};
+
+
+#endif