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 }