/**
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
*/
package com.bigdata.rdf.sail.webapp.lbs.policy.ganglia;
import com.bigdata.rdf.sail.webapp.lbs.IHostMetrics;
import com.bigdata.rdf.sail.webapp.lbs.IHostScoringRule;
/**
* This {@link IHostScoringRule} uses <code>load_one</code> to score and rank
* the hosts. The <code>lode_one</code> metric is available on Linux and FreeBSD
* platforms.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*
* @see <a
* href="http://en.wikipedia.org/wiki/Load_%28computing%29#Unix-style_load_calculation"
* > Unix Style Load Calculation </a>
*/
public class LoadOneHostScoringRule implements IHostScoringRule {
private static final String LOAD_ONE = "load_one";
@Override
public String[] getMetricNames() {
return new String[]{LOAD_ONE};
}
@Override
public double getScore(final IHostMetrics metrics) {
/**
* Note: A fallback value of 1.0 implies that the system is at 100%
* load.
*/
return metrics.getNumeric(LOAD_ONE, .75d);
}
}