/*

 * 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

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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 javax.management.ObjectName;

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;

    }

    public ObjectName getObjectName() {

        return Util.newObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE, getName());

    }

}