Timer.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * 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.
 *
 * 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/>.
 */

#ifndef TRINITY_TIMER_H
#define TRINITY_TIMER_H

#include <chrono>

inline uint32 getMSTime()
{
 using namespace std::chrono;

 static const system_clock::time_point ApplicationStartTime = system_clock::now();

 return uint32(duration_cast<milliseconds>(system_clock::now() - ApplicationStartTime).count());
}

inline uint32 getMSTimeDiff(uint32 oldMSTime, uint32 newMSTime)
{
 // getMSTime() have limited data range and this is case when it overflow in this tick
 if (oldMSTime > newMSTime)
 return (0xFFFFFFFF - oldMSTime) + newMSTime;
 else
 return newMSTime - oldMSTime;
}

inline uint32 GetMSTimeDiffToNow(uint32 oldMSTime)
{
 return getMSTimeDiff(oldMSTime, getMSTime());
}

struct IntervalTimer
{
public:

 IntervalTimer()
 : _interval(0), _current(0)
 {
 }

 void Update(time_t diff)
 {
 _current += diff;
 if (_current < 0)
 _current = 0;
 }

 bool Passed()
 {
 return _current >= _interval;
 }

 void Reset()
 {
 if (_current >= _interval)
 _current %= _interval;
 }

 void SetCurrent(time_t current)
 {
 _current = current;
 }

 void SetInterval(time_t interval)
 {
 _interval = interval;
 }

 time_t GetInterval() const
 {
 return _interval;
 }

 time_t GetCurrent() const
 {
 return _current;
 }

private:

 time_t _interval;
 time_t _current;
};

struct TimeTracker
{
public:

 TimeTracker(time_t expiry)
 : i_expiryTime(expiry)
 {
 }

 void Update(time_t diff)
 {
 i_expiryTime -= diff;
 }

 bool Passed() const
 {
 return i_expiryTime <= 0;
 }

 void Reset(time_t interval)
 {
 i_expiryTime = interval;
 }

 time_t GetExpiry() const
 {
 return i_expiryTime;
 }

private:

 time_t i_expiryTime;
};

struct TimeTrackerSmall
{
public:

 TimeTrackerSmall(uint32 expiry = 0)
 : i_expiryTime(expiry)
 {
 }

 void Update(int32 diff)
 {
 i_expiryTime -= diff;
 }

 bool Passed() const
 {
 return i_expiryTime <= 0;
 }

 void Reset(uint32 interval)
 {
 i_expiryTime = interval;
 }

 int32 GetExpiry() const
 {
 return i_expiryTime;
 }

private:

 int32 i_expiryTime;
};

struct PeriodicTimer
{
public:

 PeriodicTimer(int32 period, int32 start_time)
 : i_period(period), i_expireTime(start_time)
 {
 }

 bool Update(const uint32 diff)
 {
 if ((i_expireTime -= diff) > 0)
 return false;

 i_expireTime += i_period > int32(diff) ? i_period : diff;
 return true;
 }

 void SetPeriodic(int32 period, int32 start_time)
 {
 i_expireTime = start_time;
 i_period = period;
 }

 // Tracker interface
 void TUpdate(int32 diff) { i_expireTime -= diff; }
 bool TPassed() const { return i_expireTime <= 0; }
 void TReset(int32 diff, int32 period) { i_expireTime += period > diff ? period : diff; }

private:

 int32 i_period;
 int32 i_expireTime;
};

#endif