/* * Copyright (c) 2003, 2011, 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.management; import java.lang.management.ManagementFactory;import java.lang.management.MemoryManagerMXBean;import java.lang.management.MemoryPoolMXBean; import javax.management.MBeanNotificationInfo;import javax.management.ObjectName; /** * Implementation class for a memory manager. * Standard and committed hotspot-specific metrics if any. * * ManagementFactory.getMemoryManagerMXBeans() returns a list * of instances of this class. */class MemoryManagerImpl extends NotificationEmitterSupport    implements MemoryManagerMXBean {     private final String  name;    private final boolean isValid;    private MemoryPoolMXBean[] pools;     MemoryManagerImpl(String name) {        this.name = name;        this.isValid = true;        this.pools = null;    }     public String getName() {        return name;    }     public boolean isValid() {        return isValid;    }     public String[] getMemoryPoolNames() {        MemoryPoolMXBean[] ps = getMemoryPools();         String[] names = new String[ps.length];        for (int i = 0; i < ps.length; i++) {            names[i] = ps[i].getName();        }        return names;    }     synchronized MemoryPoolMXBean[] getMemoryPools() {        if (pools == null) {            pools = getMemoryPools0();        }        return pools;    }    private native MemoryPoolMXBean[] getMemoryPools0();     private MBeanNotificationInfo[] notifInfo = null;    public MBeanNotificationInfo[] getNotificationInfo() {        synchronized (this) {            if(notifInfo == null) {                notifInfo = new MBeanNotificationInfo[0];            }        }        return notifInfo;    }     public ObjectName getObjectName() {        return Util.newObjectName(ManagementFactory.MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE, getName());    } }