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.MemoryUsage;

    29 import javax.management.openmbean.CompositeType;

    30 import javax.management.openmbean.CompositeData;

    31 import javax.management.openmbean.CompositeDataSupport;

    32 import javax.management.openmbean.OpenDataException;

    33 

    34 /**

    35  * A CompositeData for MemoryUsage for the local management support.

    36  * This class avoids the performance penalty paid to the

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

    38  */

    39 public class MemoryUsageCompositeData extends LazyCompositeData {

    40     private final MemoryUsage usage;

    41 

    42     private MemoryUsageCompositeData(MemoryUsage u) {

    43         this.usage = u;

    44     }

    45 

    46     public MemoryUsage getMemoryUsage() {

    47         return usage;

    48     }

    49 

    50     public static CompositeData toCompositeData(MemoryUsage u) {

    51         MemoryUsageCompositeData mucd = new MemoryUsageCompositeData(u);

    52         return mucd.getCompositeData();

    53     }

    54 

    55     protected CompositeData getCompositeData() {

    56         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

    57         // memoryUsageItemNames!

    58         final Object[] memoryUsageItemValues = {

    59             usage.getInit(),

    60             usage.getUsed(),

    61             usage.getCommitted(),

    62             usage.getMax(),

    63         };

    64 

    65         try {

    66             return new CompositeDataSupport(memoryUsageCompositeType,

    67                                             memoryUsageItemNames,

    68                                             memoryUsageItemValues);

    69         } catch (OpenDataException e) {

    70             // Should never reach here

    71             throw new AssertionError(e);

    72         }

    73     }

    74 

    75     private static final CompositeType memoryUsageCompositeType;

    76     static {

    77         try {

    78             memoryUsageCompositeType = (CompositeType)

    79                 MappedMXBeanType.toOpenType(MemoryUsage.class);

    80         } catch (OpenDataException e) {

    81             // Should never reach here

    82             throw new AssertionError(e);

    83         }

    84     }

    85 

    86     static CompositeType getMemoryUsageCompositeType() {

    87         return memoryUsageCompositeType;

    88     }

    89 

    90     private static final String INIT      = "init";

    91     private static final String USED      = "used";

    92     private static final String COMMITTED = "committed";

    93     private static final String MAX       = "max";

    94 

    95     private static final String[] memoryUsageItemNames = {

    96         INIT,

    97         USED,

    98         COMMITTED,

    99         MAX,

   100     };

   101 

   102     public static long getInit(CompositeData cd) {

   103         return getLong(cd, INIT);

   104     }

   105     public static long getUsed(CompositeData cd) {

   106         return getLong(cd, USED);

   107     }

   108     public static long getCommitted(CompositeData cd) {

   109         return getLong(cd, COMMITTED);

   110     }

   111     public static long getMax(CompositeData cd) {

   112         return getLong(cd, MAX);

   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(memoryUsageCompositeType, cd.getCompositeType())) {

   125             throw new IllegalArgumentException(

   126                 "Unexpected composite type for MemoryUsage");

   127         }

   128     }

   129 

   130     private static final long serialVersionUID = -8504291541083874143L;

   131 }