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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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/*
* @test
* @bug 4982301
* @summary Sanity Test for GarbageCollectorMXBean.getLastGcInfo().
* @author Mandy Chung
*
* @run main LastGCInfo
*/
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
import java.lang.management.MemoryPoolMXBean;
import java.util.*;
import com.sun.management.GcInfo;
import com.sun.management.GarbageCollectorMXBean;
public class LastGCInfo {
public static void main(String[] argv) throws Exception {
boolean hasGcInfo = false;
System.gc();
List mgrs = ManagementFactory.getGarbageCollectorMXBeans();
for (ListIterator iter = mgrs.listIterator(); iter.hasNext(); ) {
Object mgr = iter.next();
if (mgr instanceof GarbageCollectorMXBean) {
GarbageCollectorMXBean gc = (GarbageCollectorMXBean) mgr;
GcInfo info = gc.getLastGcInfo();
if (info != null) {
checkGcInfo(gc.getName(), info);
hasGcInfo = true;
}
}
}
if (! hasGcInfo) {
throw new RuntimeException("No GcInfo returned");
}
System.out.println("Test passed.");
}
private static void checkGcInfo(String name, GcInfo info) throws Exception {
System.out.println("GC statistic for : " + name);
System.out.print("GC #" + info.getId());
System.out.print(" start:" + info.getStartTime());
System.out.print(" end:" + info.getEndTime());
System.out.println(" (" + info.getDuration() + "ms)");
Map usage = info.getMemoryUsageBeforeGc();
List pnames = new ArrayList();
for (Iterator iter = usage.entrySet().iterator(); iter.hasNext(); ) {
Map.Entry entry = (Map.Entry) iter.next();
String poolname = (String) entry.getKey();
pnames.add(poolname);
MemoryUsage busage = (MemoryUsage) entry.getValue();
MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname);
if (ausage == null) {
throw new RuntimeException("After Gc Memory does not exist" +
" for " + poolname);
}
System.out.println("Usage for pool " + poolname);
System.out.println(" Before GC: " + busage);
System.out.println(" After GC: " + ausage);
}
// check if memory usage for all memory pools are returned
List pools = ManagementFactory.getMemoryPoolMXBeans();
for (Iterator iter = pools.iterator(); iter.hasNext(); ) {
MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
if (!pnames.contains(p.getName())) {
throw new RuntimeException("GcInfo does not contain " +
"memory usage for pool " + p.getName());
}
}
}
}