/*
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 Mar 26, 2008
*/
package com.bigdata.counters;
import org.apache.log4j.Logger;
import java.util.List;
import java.util.Map;
/**
* Base class for collection of performance counters as reported by a native process.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
abstract public class AbstractProcessCollector implements IStatisticsCollector {
protected static final Logger log = Logger.getLogger(AbstractProcessCollector.class);
final private int interval;
public int getInterval() {
return interval;
}
protected ActiveProcess activeProcess;
/**
*
* @param interval
* The interval at which the performance counters will be
* read in milliseconds.
*/
public AbstractProcessCollector(final int interval) {
if (interval == 0)
throw new IllegalArgumentException();
this.interval = interval;
}
/**
* Override if you want to impose settings on environment variables.
*/
protected void setEnvironment(Map<String,String> env) {
// Fixed numbers format for sysstat commands
env.put("LC_NUMERIC", "C");
}
/**
* {@inheritDoc}
* <p>
* Creates the {@link ActiveProcess} and the
* {@link ActiveProcess#start(AbstractProcessReader)}s it passing in the
* value returned by the {@link #getProcessReader()}
*/
@Override
public void start() {
log.info("");
activeProcess = new ActiveProcess(getCommand(), this);
activeProcess.start(getProcessReader());
}
@Override
public void stop() {
log.info("");
if (activeProcess != null) {
activeProcess.stop();
activeProcess = null;
}
}
abstract public List<String> getCommand();
abstract public AbstractProcessReader getProcessReader();
}