/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of 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.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.seda;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class WorkMonitor {
private static final double BY_MILLIS = 1000000d;
private ReentrantReadWriteLock lock;
private TimeNormalizer idleNormalizer;
private TimeNormalizer activeNormalizer;
private DurationMonitor durationMonitor;
public WorkMonitor (DurationMonitor durationMonitor, long trackingTime, TimeUnit trackingTimeUnit) {
this.durationMonitor = durationMonitor;
idleNormalizer = new TimeNormalizer(trackingTimeUnit.toMillis(trackingTime));
activeNormalizer = new TimeNormalizer(trackingTimeUnit.toMillis(trackingTime));
lock = new ReentrantReadWriteLock();
}
public double getIdlePercentage () {
lock.readLock().lock();
try {
double idleTime;
double totalTime;
if ((totalTime = (idleTime = idleNormalizer.getTotal()) + activeNormalizer.getTotal()) == 0) {
return 0;
}
return (idleTime / totalTime) * 100;
}
finally {
lock.readLock().unlock();
}
}
public double getActivePercentage () {
lock.readLock().lock();
try {
double activeTime;
double totalTime;
if ((totalTime = idleNormalizer.getTotal() + (activeTime = activeNormalizer.getTotal())) == 0) {
return 0;
}
return (activeTime / totalTime) * 100;
}
finally {
lock.readLock().unlock();
}
}
protected void addIdleTime (StopWatch stopWatch) {
double end = stopWatch.getStartMillis() + (stopWatch.getDurationNanos() / BY_MILLIS);
lock.writeLock().lock();
try {
idleNormalizer.additional(stopWatch.getStartMillis(), end);
activeNormalizer.update(end);
}
finally {
lock.writeLock().unlock();
}
}
protected void addActiveTime (StopWatch stopWatch) {
double end = stopWatch.getStartMillis() + (stopWatch.getDurationNanos() / BY_MILLIS);
lock.writeLock().lock();
try {
activeNormalizer.additional(stopWatch.getStartMillis(), end);
idleNormalizer.update(end);
durationMonitor.accumulate(stopWatch.getDurationNanos());
}
finally {
lock.writeLock().unlock();
}
}
private static class TimeNormalizer {
private boolean initialized = false;
private double start;
private double stop;
private double average;
private long track;
public TimeNormalizer (long track) {
this.track = track;
}
public double getTotal () {
if (!initialized) {
return 0;
}
return (stop - start) * average;
}
public void update (double end) {
if (initialized) {
double oldest;
if ((oldest = end - track) > stop) {
start = 0;
stop = 0;
average = 0;
}
else {
oldest = Math.max(start, oldest);
average = ((stop - oldest) * average) / (end - oldest);
start = oldest;
stop = end;
}
}
}
public void additional (long begin, double end) {
if (end > begin) {
if (!initialized) {
initialized = true;
start = begin;
stop = end;
average = 1;
}
else {
double oldest;
if ((oldest = end - track) > stop) {
start = begin;
average = 1;
}
else {
oldest = Math.max(start, oldest);
average = (((stop - oldest) * average) + (end - begin)) / (end - oldest);
start = oldest;
}
stop = end;
}
}
}
}
}