Meter.h

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/*
 * Copyright (C) 1996-2019 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_SRC_MEM_METER_H
#define SQUID_SRC_MEM_METER_H

#include "SquidTime.h"

namespace Mem
{

class Meter
{
public:
    Meter() : level(0), hwater_level(0), hwater_stamp(0) {}

    void flush() {level=0;}

    ssize_t currentLevel() const {return level;}
    ssize_t peak() const {return hwater_level;}
    time_t peakTime() const {return hwater_stamp;}

    Meter &operator ++() {++level; checkHighWater(); return *this;}
    Meter &operator --() {--level; return *this;}

    Meter &operator +=(ssize_t n) { level += n; checkHighWater(); return *this;}
    Meter &operator -=(ssize_t n) { level -= n; return *this;}

private:
    void checkHighWater() {
        if (hwater_level < level) {
            hwater_level = level;
            hwater_stamp = squid_curtime ? squid_curtime : time(NULL);
        }
    }

    ssize_t level;          
    ssize_t hwater_level;   
    time_t hwater_stamp;    
};

} // namespace Mem

#endif /* SQUID_SRC_MEM_METER_H */