1 /*

     2  * Copyright (c) 2004, 2008, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.management;

    27 

    28 import java.lang.management.MemoryNotificationInfo;

    29 import java.lang.management.MemoryUsage;

    30 import javax.management.openmbean.CompositeData;

    31 import javax.management.openmbean.CompositeType;

    32 import javax.management.openmbean.CompositeDataSupport;

    33 import javax.management.openmbean.OpenDataException;

    34 

    35 /**

    36  * A CompositeData for MemoryNotificationInfo for the local management support.

    37  * This class avoids the performance penalty paid to the

    38  * construction of a CompositeData use in the local case.

    39  */

    40 public class MemoryNotifInfoCompositeData extends LazyCompositeData {

    41     private final MemoryNotificationInfo memoryNotifInfo;

    42 

    43     private MemoryNotifInfoCompositeData(MemoryNotificationInfo info) {

    44         this.memoryNotifInfo = info;

    45     }

    46 

    47     public MemoryNotificationInfo getMemoryNotifInfo() {

    48         return memoryNotifInfo;

    49     }

    50 

    51     public static CompositeData toCompositeData(MemoryNotificationInfo info) {

    52         MemoryNotifInfoCompositeData mnicd =

    53             new MemoryNotifInfoCompositeData(info);

    54         return mnicd.getCompositeData();

    55     }

    56 

    57     protected CompositeData getCompositeData() {

    58         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

    59         // memoryNotifInfoItemNames!

    60         final Object[] memoryNotifInfoItemValues = {

    61             memoryNotifInfo.getPoolName(),

    62             MemoryUsageCompositeData.toCompositeData(memoryNotifInfo.getUsage()),

    63             memoryNotifInfo.getCount(),

    64         };

    65 

    66         try {

    67             return new CompositeDataSupport(memoryNotifInfoCompositeType,

    68                                             memoryNotifInfoItemNames,

    69                                             memoryNotifInfoItemValues);

    70         } catch (OpenDataException e) {

    71             // Should never reach here

    72             throw new AssertionError(e);

    73         }

    74     }

    75 

    76     private static final CompositeType memoryNotifInfoCompositeType;

    77     static {

    78         try {

    79             memoryNotifInfoCompositeType = (CompositeType)

    80                 MappedMXBeanType.toOpenType(MemoryNotificationInfo.class);

    81         } catch (OpenDataException e) {

    82             // Should never reach here

    83             throw new AssertionError(e);

    84         }

    85     }

    86 

    87     private static final String POOL_NAME = "poolName";

    88     private static final String USAGE     = "usage";

    89     private static final String COUNT     = "count";

    90     private static final String[] memoryNotifInfoItemNames = {

    91         POOL_NAME,

    92         USAGE,

    93         COUNT,

    94     };

    95 

    96 

    97     public static String getPoolName(CompositeData cd) {

    98         String poolname = getString(cd, POOL_NAME);

    99         if (poolname == null) {

   100             throw new IllegalArgumentException("Invalid composite data: " +

   101                 "Attribute " + POOL_NAME + " has null value");

   102         }

   103         return poolname;

   104     }

   105 

   106     public static MemoryUsage getUsage(CompositeData cd) {

   107         CompositeData usageData = (CompositeData) cd.get(USAGE);

   108         return MemoryUsage.from(usageData);

   109     }

   110 

   111     public static long getCount(CompositeData cd) {

   112         return getLong(cd, COUNT);

   113     }

   114 

   115     /** Validate if the input CompositeData has the expected

   116      * CompositeType (i.e. contain all attributes with expected

   117      * names and types).

   118      */

   119     public static void validateCompositeData(CompositeData cd) {

   120         if (cd == null) {

   121             throw new NullPointerException("Null CompositeData");

   122         }

   123 

   124         if (!isTypeMatched(memoryNotifInfoCompositeType, cd.getCompositeType())) {

   125             throw new IllegalArgumentException(

   126                 "Unexpected composite type for MemoryNotificationInfo");

   127         }

   128     }

   129 

   130     private static final long serialVersionUID = -1805123446483771291L;

   131 }