/*
* Copyright 2003-2005 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.management;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.MemoryNotificationInfo;
import java.lang.management.MemoryManagerMXBean;
import java.lang.management.MemoryPoolMXBean;
import javax.management.ObjectName;
import javax.management.MalformedObjectNameException;
import javax.management.MBeanNotificationInfo;
import javax.management.Notification;
import javax.management.NotificationEmitter;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.ListenerNotFoundException;
import javax.management.openmbean.CompositeData;
import java.util.List;
import java.util.ArrayList;
import java.util.ListIterator;
import java.util.Collections;
/**
* Implementation class for the memory subsystem.
* Standard and committed hotspot-specific metrics if any.
*
* ManagementFactory.getMemoryMXBean() returns an instance
* of this class.
*/
class MemoryImpl extends NotificationEmitterSupport
implements MemoryMXBean {
private final VMManagement jvm;
private static MemoryPoolMXBean[] pools = null;
private static MemoryManagerMXBean[] mgrs = null;
/**
* Constructor of MemoryImpl class
*/
MemoryImpl(VMManagement vm) {
this.jvm = vm;
}
public int getObjectPendingFinalizationCount() {
return sun.misc.VM.getFinalRefCount();
}
public void gc() {
Runtime.getRuntime().gc();
}
// Need to make a VM call to get coherent value
public MemoryUsage getHeapMemoryUsage() {
return getMemoryUsage0(true);
}
public MemoryUsage getNonHeapMemoryUsage() {
return getMemoryUsage0(false);
}
public boolean isVerbose() {
return jvm.getVerboseGC();
}
public void setVerbose(boolean value) {
ManagementFactory.checkControlAccess();
setVerboseGC(value);
}
// The current Hotspot implementation does not support
// dynamically add or remove memory pools & managers.
static synchronized MemoryPoolMXBean[] getMemoryPools() {
if (pools == null) {
pools = getMemoryPools0();
}
return pools;
}
static synchronized MemoryManagerMXBean[] getMemoryManagers() {
if (mgrs == null) {
mgrs = getMemoryManagers0();
}
return mgrs;
}
private static native MemoryPoolMXBean[] getMemoryPools0();
private static native MemoryManagerMXBean[] getMemoryManagers0();
private native MemoryUsage getMemoryUsage0(boolean heap);
private native void setVerboseGC(boolean value);
private final static String notifName =
"javax.management.Notification";
private final static String[] notifTypes = {
MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED,
MemoryNotificationInfo.MEMORY_COLLECTION_THRESHOLD_EXCEEDED
};
private final static String[] notifMsgs = {
"Memory usage exceeds usage threshold",
"Memory usage exceeds collection usage threshold"
};
private MBeanNotificationInfo[] notifInfo = null;
public MBeanNotificationInfo[] getNotificationInfo() {
synchronized (this) {
if (notifInfo == null) {
notifInfo = new MBeanNotificationInfo[1];
notifInfo[0] = new MBeanNotificationInfo(notifTypes,
notifName,
"Memory Notification");
}
}
return notifInfo;
}
private static String getNotifMsg(String notifType) {
for (int i = 0; i < notifTypes.length; i++) {
if (notifType == notifTypes[i]) {
return notifMsgs[i];
}
}
return "Unknown message";
}
private static long seqNumber = 0;
private static long getNextSeqNumber() {
return ++seqNumber;
}
private static ObjectName objname = null;
private static synchronized ObjectName getObjectName() {
if (objname != null) return objname;
try {
objname = new ObjectName(java.lang.management.ManagementFactory.MEMORY_MXBEAN_NAME);
} catch (MalformedObjectNameException e) {
// should never reach here
throw Util.newInternalError(e);
}
return objname;
}
static void createNotification(String notifType,
String poolName,
MemoryUsage usage,
long count) {
MemoryImpl mbean = (MemoryImpl) ManagementFactory.getMemoryMXBean();
if (!mbean.hasListeners()) {
// if no listener is registered.
return;
}
long timestamp = System.currentTimeMillis();
String msg = getNotifMsg(notifType);
Notification notif = new Notification(notifType,
getObjectName(),
getNextSeqNumber(),
timestamp,
msg);
MemoryNotificationInfo info =
new MemoryNotificationInfo(poolName,
usage,
count);
CompositeData cd =
MemoryNotifInfoCompositeData.toCompositeData(info);
notif.setUserData(cd);
mbean.sendNotification(notif);
}
}