package org.radargun.sysmonitor;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import org.radargun.reporting.Timeline;
import org.radargun.traits.JmxConnectionProvider;
/**
* UNIX-only: checks number of open descriptors in given process
*
* @author Radim Vansa <rvansa@redhat.com>
*/
public class OpenFilesMonitor extends JmxMonitor {
private static final String OPEN_FILES = "Open files";
private static final String OPEN_FILE_DESCRIPTOR_COUNT = "OpenFileDescriptorCount";
private static final String MAX_FILE_DESCRIPTOR_COUNT = "MaxFileDescriptorCount";
public OpenFilesMonitor(JmxConnectionProvider jmxConnectionProvider, Timeline timeline) {
super(jmxConnectionProvider, timeline);
}
public synchronized void run() {
try {
if (connection == null) {
log.warn("MBean connection is not open, cannot read open files stats");
return;
}
OperatingSystemMXBean osBean = ManagementFactory.newPlatformMXBeanProxy(connection, ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME,
OperatingSystemMXBean.class);
Long openFiles = (Long) connection.getAttribute(osBean.getObjectName(), OPEN_FILE_DESCRIPTOR_COUNT);
Long maxOpenFiles = (Long) connection.getAttribute(osBean.getObjectName(), MAX_FILE_DESCRIPTOR_COUNT);
if (openFiles != null) {
timeline.addValue(OPEN_FILES, new Timeline.Value(openFiles));
}
log.tracef("Open files: open=%s, max=%s", openFiles, maxOpenFiles);
} catch (Exception e) {
log.error("Error in open files stats retrieval", e);
}
}
@Override
public synchronized void start() {
super.start();
timeline.addValue(OPEN_FILES, new Timeline.Value(0));
}
@Override
public synchronized void stop() {
super.stop();
timeline.addValue(OPEN_FILES, new Timeline.Value(0));
}
}