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/*
SPDX-FileCopyrightText: 2006 David Nolden <david.nolden.kdevelop@art-master.de>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef CACHEMANAGER_H
#define CACHEMANAGER_H
#include <cstdlib>
#include <set>
#include <limits>
class CacheManager;
#ifndef inline
#define inline __inline
#endif
class CacheNode
{
typedef CacheManager Manager;
public:
explicit CacheNode(Manager* manager);
virtual ~CacheNode();
void access() const;
inline unsigned int value() const
{
return m_value;
}
inline void setValue(const unsigned int v) const
{
m_value = v;
}
inline void addValue(const unsigned int diff) const
{
m_value += diff;
}
private:
Manager* m_manager;
mutable unsigned int 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)
{
};
virtual ~CacheManager() {}
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(unsigned int normalizeby);
friend class CacheNode;
void remove(const CacheNode* node);
void add(const CacheNode* node);
int m_currentFrame;
unsigned int m_maxNodes;
unsigned int m_currentMax;
SetType m_set;
};
#endif
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