/**
* Copyright 2008 - CommonCrawl Foundation
*
* 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 3 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/>.
*
**/
package org.commoncrawl.async;
/**
* A Timer that can fire inside of an event loop
*
* @author rana
*
*/
public final class Timer implements Comparable<Timer> {
private long _delay;
private boolean _periodic;
private long _nextFireTime = 0;
public static interface Callback {
public void timerFired(Timer timer);
};
private Callback _callback;
public Timer(long delay,boolean periodic,Callback callback) {
_delay = delay;
_periodic = periodic;
_callback = callback;
}
public long getDelay() { return _delay; }
public boolean isPeriodic() { return _periodic; }
public boolean isArmed() { return _nextFireTime != 0; }
long getNextFireTime() { return _nextFireTime; }
void fire() {
if (_periodic) {
// rearm
arm();
}
else {
disarm();
}
_callback.timerFired(this);
}
void arm() { _nextFireTime = System.currentTimeMillis() + _delay; }
void disarm() { _nextFireTime = 0; }
public void rearm() { arm(); }
//@Override
public int compareTo(Timer t) {
if (_nextFireTime < t._nextFireTime)
return -1;
else if (_nextFireTime > t._nextFireTime)
return 1;
else
return 0;
}
}