/**
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.journal;
import java.util.Properties;
import org.apache.log4j.Logger;
import com.bigdata.counters.AbstractStatisticsCollector;
import com.bigdata.counters.ICounterSet;
/**
* {@link IPlugin} for collecting statistics from the operating system.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public class PlatformStatsPlugIn implements IPlugIn<Journal, AbstractStatisticsCollector> {
private static final Logger log = Logger.getLogger(PlatformStatsPlugIn.class);
public interface Options extends AbstractStatisticsCollector.Options {
/**
* Boolean option for the collection of statistics from the underlying
* operating system (default
* {@value #DEFAULT_COLLECT_PLATFORM_STATISTICS}).
*
* @see AbstractStatisticsCollector#newInstance(Properties)
*/
String COLLECT_PLATFORM_STATISTICS = Journal.class.getName()
+ ".collectPlatformStatistics";
String DEFAULT_COLLECT_PLATFORM_STATISTICS = "false";
}
/**
* Collects interesting statistics on the host and process.
*
* @see Options#COLLECT_PLATFORM_STATISTICS
*/
private AbstractStatisticsCollector platformStatisticsCollector = null;
/**
* {@inheritDoc}
* <p>
* Start collecting performance counters from the OS (if enabled).
*/
@Override
public void startService(final Journal indexManager) {
final boolean collectPlatformStatistics = Boolean
.valueOf(indexManager.getProperty(Options.COLLECT_PLATFORM_STATISTICS,
Options.DEFAULT_COLLECT_PLATFORM_STATISTICS));
if (log.isInfoEnabled())
log.info(Options.COLLECT_PLATFORM_STATISTICS + "="
+ collectPlatformStatistics);
if (!collectPlatformStatistics) {
return;
}
final Properties p = indexManager.getProperties();
if (p.getProperty(AbstractStatisticsCollector.Options.PROCESS_NAME) == null) {
// Set default name for this process.
p.setProperty(AbstractStatisticsCollector.Options.PROCESS_NAME,
"service" + ICounterSet.pathSeparator
+ Journal.class.getName());
}
try {
final AbstractStatisticsCollector tmp = AbstractStatisticsCollector
.newInstance(p);
tmp.start();
synchronized(this) {
platformStatisticsCollector = tmp;
}
if (log.isInfoEnabled())
log.info("Collecting platform statistics.");
} catch (Throwable t) {
log.error(t, t);
}
}
/**
* {@inheritDoc}
* <p>
* NOP - Collection is on the JVM and the OS. If it is shutdown with each
* {@link Journal} shutdown, then collection would wind up disabled with the
* first {@link Journal} shutdown even if there is more than one open
* {@link Journal}.
*/
@Override
public void stopService(boolean immediateShutdown) {
// NOP
}
@Override
public AbstractStatisticsCollector getService() {
synchronized(this) {
return platformStatisticsCollector;
}
}
@Override
public boolean isRunning() {
synchronized(this) {
return platformStatisticsCollector != null;
}
}
}