/*! \file OnlineStatisticNode.h
	\brief A brief file description.
  	
	A more elaborated file description.
	
	Created: 2015/07/16, author: Jin Bingwen.
*/

#ifndef __OnlineStatisticNode_h_
#define __OnlineStatisticNode_h_

#include "CyclopsVersion.h"
#include "StatisticEle.h"
#include "CyclopsLock.h"

class OnlineStatisticNode : public StatisticsNode
{
public:
    OnlineStatisticNode();
	typedef std::shared_ptr<OnlineStatisticNode> Ptr;
	DECL_GET_INSTANCE(OnlineStatisticNode::Ptr)

	virtual void compute();

	virtual void push_back(double val);
	virtual void pop_front();
	virtual void pop_back();
	virtual void clear(bool clearSource = true);

    bool getIsSaveSource() const { return mIsSaveSource; }
	virtual void setIsSaveSource(bool val);

    // 0: queue size unlimited
	virtual void setFixedSize(size_t nSize);
	int getFixedSize() const { return mFixedSize; }

	virtual std::list<double> getSourceInList(int num = 0);

protected:
    double mSum;
    double mSqrSum;

    bool mIsSaveSource;
    size_t mFixedSize;

	void computeSumSqrSum();
    void computeMeanStdDev();
	void computeMinMax();
    void pop(double val, bool fromFront);

	void _compute();
	void _push_back(double val);
	void _pop_front();
	void _pop_back();
	void _clear(bool clearSource = true);

private:
	CyclopsLock mLock;
};

#endif // __OnlineStatisticNode_h_