/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Jun 15, 2009
*/
package com.bigdata.util.concurrent;
import java.util.concurrent.Callable;
/**
* Moving average based on the change in some sampled value.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class DeltaMovingAverageTask extends MovingAverageTask {
/**
* @param name
* @param sampleTask
*/
public DeltaMovingAverageTask(String name,
Callable<? extends Number> sampleTask) {
super(name, sampleTask);
}
/**
* @param name
* @param sampleTask
* @param w
*/
public DeltaMovingAverageTask(String name,
Callable<? extends Number> sampleTask, double w) {
super(name, sampleTask, w);
}
/**
* Note: don't throw anything from here or it will cause the task to no
* longer be run!
*/
public void run() {
try {
final double sample = sampleTask.call().doubleValue();
final double delta = sample - oldValue;
oldValue = sample;
average = getMovingAverage(average, delta, w);
nsamples++;
} catch (Exception ex) {
log.warn(name, ex);
}
}
private double oldValue = 0d;
}