1 /*
   2  * Copyright (c) 2012, 2018, 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.LockInfo;
  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 LockInfo 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 LockInfoCompositeData extends LazyCompositeData {
  40     private final LockInfo lock;
  41 
  42     private LockInfoCompositeData(LockInfo li) {
  43         this.lock = li;
  44     }
  45 
  46     public LockInfo getLockInfo() {
  47         return lock;
  48     }
  49 
  50     public static CompositeData toCompositeData(LockInfo li) {
  51         if (li == null) {
  52             return null;
  53         }
  54 
  55         LockInfoCompositeData licd = new LockInfoCompositeData(li);
  56         return licd.getCompositeData();
  57     }
  58 
  59     protected CompositeData getCompositeData() {
  60         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH
  61         // LOCK_INFO_ATTRIBUTES!
  62         final Object[] lockInfoItemValues = {
  63             new String(lock.getClassName()),
  64             lock.getIdentityHashCode(),
  65         };
  66 
  67         try {
  68             return new CompositeDataSupport(LOCK_INFO_COMPOSITE_TYPE,
  69                                             LOCK_INFO_ATTRIBUTES,
  70                                             lockInfoItemValues);
  71         } catch (OpenDataException e) {
  72             // Should never reach here
  73             throw Util.newException(e);
  74         }
  75     }
  76 
  77     private static final CompositeType LOCK_INFO_COMPOSITE_TYPE;
  78     static {
  79         try {
  80             LOCK_INFO_COMPOSITE_TYPE = (CompositeType)
  81                 MappedMXBeanType.toOpenType(LockInfo.class);
  82         } catch (OpenDataException e) {
  83             // Should never reach here
  84             throw Util.newException(e);
  85         }
  86     }
  87 
  88     static CompositeType compositeType() {
  89         return LOCK_INFO_COMPOSITE_TYPE;
  90     }
  91 
  92     private static final String CLASS_NAME         = "className";
  93     private static final String IDENTITY_HASH_CODE = "identityHashCode";
  94     private static final String[] LOCK_INFO_ATTRIBUTES = {
  95         CLASS_NAME,
  96         IDENTITY_HASH_CODE,
  97     };
  98 
  99     /*
 100      * Returns a LockInfo object mapped from the given CompositeData.
 101      */
 102     public static LockInfo toLockInfo(CompositeData cd) {
 103         if (cd == null) {
 104             throw new NullPointerException("Null CompositeData");
 105         }
 106 
 107         if (!isTypeMatched(LOCK_INFO_COMPOSITE_TYPE, cd.getCompositeType())) {
 108             throw new IllegalArgumentException(
 109                 "Unexpected composite type for LockInfo");
 110         }
 111 
 112         String className = getString(cd, CLASS_NAME);
 113         int identityHashCode = getInt(cd, IDENTITY_HASH_CODE);
 114         return new LockInfo(className, identityHashCode);
 115     }
 116 
 117     private static final long serialVersionUID = -6374759159749014052L;
 118 }