1 /*
   2  * Copyright (c) 2004, 2019, 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     @SuppressWarnings("serial") // Not statically typed as Serializable
  42     private final MemoryNotificationInfo memoryNotifInfo;
  43 
  44     private MemoryNotifInfoCompositeData(MemoryNotificationInfo info) {
  45         this.memoryNotifInfo = info;
  46     }
  47 
  48     public MemoryNotificationInfo getMemoryNotifInfo() {
  49         return memoryNotifInfo;
  50     }
  51 
  52     public static CompositeData toCompositeData(MemoryNotificationInfo info) {
  53         MemoryNotifInfoCompositeData mnicd =
  54             new MemoryNotifInfoCompositeData(info);
  55         return mnicd.getCompositeData();
  56     }
  57 
  58     protected CompositeData getCompositeData() {
  59         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH
  60         // memoryNotifInfoItemNames!
  61         final Object[] memoryNotifInfoItemValues = {
  62             memoryNotifInfo.getPoolName(),
  63             MemoryUsageCompositeData.toCompositeData(memoryNotifInfo.getUsage()),
  64             memoryNotifInfo.getCount(),
  65         };
  66 
  67         try {
  68             return new CompositeDataSupport(memoryNotifInfoCompositeType,
  69                                             memoryNotifInfoItemNames,
  70                                             memoryNotifInfoItemValues);
  71         } catch (OpenDataException e) {
  72             // Should never reach here
  73             throw new AssertionError(e);
  74         }
  75     }
  76 
  77     private static final CompositeType memoryNotifInfoCompositeType;
  78     static {
  79         try {
  80             memoryNotifInfoCompositeType = (CompositeType)
  81                 MappedMXBeanType.toOpenType(MemoryNotificationInfo.class);
  82         } catch (OpenDataException e) {
  83             // Should never reach here
  84             throw new AssertionError(e);
  85         }
  86     }
  87 
  88     private static final String POOL_NAME = "poolName";
  89     private static final String USAGE     = "usage";
  90     private static final String COUNT     = "count";
  91     private static final String[] memoryNotifInfoItemNames = {
  92         POOL_NAME,
  93         USAGE,
  94         COUNT,
  95     };
  96 
  97 
  98     public static String getPoolName(CompositeData cd) {
  99         String poolname = getString(cd, POOL_NAME);
 100         if (poolname == null) {
 101             throw new IllegalArgumentException("Invalid composite data: " +
 102                 "Attribute " + POOL_NAME + " has null value");
 103         }
 104         return poolname;
 105     }
 106 
 107     public static MemoryUsage getUsage(CompositeData cd) {
 108         CompositeData usageData = (CompositeData) cd.get(USAGE);
 109         return MemoryUsage.from(usageData);
 110     }
 111 
 112     public static long getCount(CompositeData cd) {
 113         return getLong(cd, COUNT);
 114     }
 115 
 116     /** Validate if the input CompositeData has the expected
 117      * CompositeType (i.e. contain all attributes with expected
 118      * names and types).
 119      */
 120     public static void validateCompositeData(CompositeData cd) {
 121         if (cd == null) {
 122             throw new NullPointerException("Null CompositeData");
 123         }
 124 
 125         if (!isTypeMatched(memoryNotifInfoCompositeType, cd.getCompositeType())) {
 126             throw new IllegalArgumentException(
 127                 "Unexpected composite type for MemoryNotificationInfo");
 128         }
 129     }
 130 
 131     private static final long serialVersionUID = -1805123446483771291L;
 132 }