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/* Copyright (C) 2003 MySQL AB
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
/**
* @class Timer
* @brief A timer class that can't be fooled by NTP:ing the system clock to old time
*/
class Timer {
public:
Timer() {
m_delay = 10;
};
Timer(NDB_TICKS delay_time) {
m_delay = delay_time;
}
/**
* Set/Get alarm time of timer
*/
inline void setDelay(NDB_TICKS delay_time) { m_delay = delay_time; }
inline NDB_TICKS getDelay() { return m_delay; }
/**
* Start timer
*/
inline void reset() {
m_current_time = NdbTick_CurrentMillisecond();
m_alarm_time = m_current_time + m_delay;
}
/**
* Check for alarm
*/
inline bool check() { return check(NdbTick_CurrentMillisecond()); }
inline bool check(NDB_TICKS check_time) {
/**
* Standard alarm check
*/
if (check_time > m_alarm_time) return true;
/**
* Time progressing, but it is not alarm time yet
*/
if (check_time >= m_current_time) return false;
/**
* Time has moved backwards
*/
reset();
return false;
}
private:
NDB_TICKS m_current_time;
NDB_TICKS m_alarm_time;
NDB_TICKS m_delay;
};
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