/*
* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package sun.management;
import com.sun.management.GarbageCollectorMXBean;
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 java.util.List;
import java.util.ListIterator;
/**
* 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 pools = ManagementFactory.getMemoryPoolMXBeans();
poolNames = new String[pools.size()];
int i = 0;
for (ListIterator iter = pools.listIterator();
iter.hasNext();
i++) {
MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
poolNames[i] = p.getName();
}
}
return poolNames;
}
// Sun JDK extension
private GcInfoBuilder gcInfoBuilder;
public GcInfo getLastGcInfo() {
synchronized (this) {
if (gcInfoBuilder == null) {
gcInfoBuilder = new GcInfoBuilder(this, getAllPoolNames());
}
}
GcInfo info = gcInfoBuilder.getLastGcInfo();
return info;
}
}