/**
*
*/
package winterwell.utils;
import java.lang.management.ManagementFactory;
import javax.management.MBeanServer;
import com.sun.management.HotSpotDiagnosticMXBean;
/**
* Create a heap dump on Sun Hotspot JVMs
*
* Halfinched from:
* http://swik.net/openjdk/Java+Attributes/Programmatically+dumping
* +heap+from+Java+applications
*
* @author Joe Halliwell <joe@winterwell.com>
*
*/
public class HotspotHeapDump {
// This is the name of the HotSpot Diagnostic MBean
private static final String HOTSPOT_BEAN_NAME = "com.sun.management:type=HotSpotDiagnostic";
// field to store the hotspot diagnostic MBean
private static volatile HotSpotDiagnosticMXBean hotspotMBean;
/**
* Call this method from your application whenever you want to dump the heap
* snapshot into a file.
*
* @param fileName
* name of the heap dump file
* @param live
* flag that tells whether to dump only the live objects
*/
public static void dump(String fileName, boolean live) {
// initialize hotspot diagnostic MBean
initHotspotMBean();
try {
hotspotMBean.dumpHeap(fileName, live);
} catch (RuntimeException re) {
throw re;
} catch (Exception exp) {
throw new RuntimeException(exp);
}
}
// get the hotspot diagnostic MBean from the
// platform MBean server
private static HotSpotDiagnosticMXBean getHotspotMBean() {
try {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
HotSpotDiagnosticMXBean bean = ManagementFactory
.newPlatformMXBeanProxy(server, HOTSPOT_BEAN_NAME,
HotSpotDiagnosticMXBean.class);
return bean;
} catch (RuntimeException re) {
throw re;
} catch (Exception exp) {
throw new RuntimeException(exp);
}
}
// initialize the hotspot diagnostic MBean field
private static void initHotspotMBean() {
if (hotspotMBean == null) {
synchronized (HotspotHeapDump.class) {
if (hotspotMBean == null) {
hotspotMBean = getHotspotMBean();
}
}
}
}
}