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package de.lmu.ifi.dbs.elki.logging.statistics;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2014
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Class that tracks the runtime of a task with {@code System.nanoTime()}
*
* @author Erich Schubert
*/
public class NanoDuration extends AbstractStatistic implements Duration {
/**
* Tracking variables.
*/
long begin = -1, end = -2;
/**
* Constructor.
*
* @param key Key
*/
public NanoDuration(String key) {
super(key);
}
@Override
public NanoDuration begin() {
begin = System.nanoTime();
return this;
}
@Override
public NanoDuration end() {
end = System.nanoTime();
return this;
}
@Override
public long getBegin() {
return begin;
}
@Override
public long getEnd() {
return end;
}
@Override
public long getDuration() {
return (end - begin);
}
@Override
public String formatValue() {
return getDuration() + " ns";
}
}
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