/*
* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.management;
import com.sun.management.GarbageCollectorMXBean;
import com.sun.management.GarbageCollectionNotificationInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import com.sun.management.GcInfo;
import javax.management.openmbean.CompositeData;
import javax.management.MBeanInfo;
import javax.management.MBeanAttributeInfo;
import javax.management.ObjectName;
import javax.management.MBeanNotificationInfo;
import javax.management.Notification;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.ListenerNotFoundException;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
/**
* Implementation class for the garbage collector.
* Standard and committed hotspot-specific metrics if any.
*
* ManagementFactory.getGarbageCollectorMXBeans() returns a list
* of instances of this class.
*/
class GarbageCollectorImpl extends MemoryManagerImpl
implements GarbageCollectorMXBean {
GarbageCollectorImpl(String name) {
super(name);
}
public native long getCollectionCount();
public native long getCollectionTime();
// The memory pools are static and won't be changed.
// TODO: If the hotspot implementation begins to have pools
// dynamically created and removed, this needs to be modified.
private String[] poolNames = null;
synchronized String[] getAllPoolNames() {
if (poolNames == null) {
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
poolNames = new String[pools.size()];
int i = 0;
for (MemoryPoolMXBean m : pools) {
poolNames[i++] = m.getName();
}
}
return poolNames;
}
// Sun JDK extension
private GcInfoBuilder gcInfoBuilder;
private synchronized GcInfoBuilder getGcInfoBuilder() {
if(gcInfoBuilder == null) {
gcInfoBuilder = new GcInfoBuilder(this, getAllPoolNames());
}
return gcInfoBuilder;
}
public GcInfo getLastGcInfo() {
GcInfo info = getGcInfoBuilder().getLastGcInfo();
return info;
}
private final static String notifName =
"javax.management.Notification";
private final static String[] gcNotifTypes = {
GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION
};
private MBeanNotificationInfo[] notifInfo = null;
public MBeanNotificationInfo[] getNotificationInfo() {
synchronized (this) {
if (notifInfo == null) {
notifInfo = new MBeanNotificationInfo[1];
notifInfo[0] = new MBeanNotificationInfo(gcNotifTypes,
notifName,
"GC Notification");
}
}
return notifInfo;
}
private static long seqNumber = 0;
private static long getNextSeqNumber() {
return ++seqNumber;
}
void createGCNotification(long timestamp,
String gcName,
String gcAction,
String gcCause,
GcInfo gcInfo) {
if (!hasListeners()) {
return;
}
Notification notif = new Notification(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION,
getObjectName(),
getNextSeqNumber(),
timestamp,
gcName);
GarbageCollectionNotificationInfo info =
new GarbageCollectionNotificationInfo(gcName,
gcAction,
gcCause,
gcInfo);
CompositeData cd =
GarbageCollectionNotifInfoCompositeData.toCompositeData(info);
notif.setUserData(cd);
sendNotification(notif);
}
public synchronized void addNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
{
boolean before = hasListeners();
super.addNotificationListener(listener, filter, handback);
boolean after = hasListeners();
if (!before && after) {
setNotificationEnabled(this, true);
}
}
public synchronized void removeNotificationListener(NotificationListener listener)
throws ListenerNotFoundException {
boolean before = hasListeners();
super.removeNotificationListener(listener);
boolean after = hasListeners();
if (before && !after) {
setNotificationEnabled(this,false);
}
}
public synchronized void removeNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
throws ListenerNotFoundException
{
boolean before = hasListeners();
super.removeNotificationListener(listener,filter,handback);
boolean after = hasListeners();
if (before && !after) {
setNotificationEnabled(this,false);
}
}
public ObjectName getObjectName() {
return Util.newObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE, getName());
}
native void setNotificationEnabled(GarbageCollectorMXBean gc,
boolean enabled);
}