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             new Long(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 }