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 java.util.Map;
  30 import javax.management.openmbean.CompositeType;
  31 import javax.management.openmbean.CompositeData;
  32 import javax.management.openmbean.CompositeDataSupport;
  33 import javax.management.openmbean.OpenDataException;
  34 
  35 /**
  36  * A CompositeData for LockInfo 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 LockInfoCompositeData extends LazyCompositeData {
  41     private final LockInfo lock;
  42 
  43     private LockInfoCompositeData(LockInfo li) {
  44         this.lock = li;
  45     }
  46 
  47     public LockInfo getLockInfo() {
  48         return lock;
  49     }
  50 
  51     public static CompositeData toCompositeData(LockInfo li) {
  52         if (li == null) {
  53             return null;
  54         }
  55 
  56         LockInfoCompositeData licd = new LockInfoCompositeData(li);
  57         return licd.getCompositeData();
  58     }
  59 
  60     protected CompositeData getCompositeData() {
  61         Map<String,Object> items = Map.of(
  62             CLASS_NAME,         lock.getClassName(),
  63             IDENTITY_HASH_CODE, lock.getIdentityHashCode()
  64         );
  65 
  66         try {
  67             return new CompositeDataSupport(LOCK_INFO_COMPOSITE_TYPE, items);
  68         } catch (OpenDataException e) {
  69             // Should never reach here
  70             throw Util.newException(e);
  71         }
  72     }
  73 
  74     private static final CompositeType LOCK_INFO_COMPOSITE_TYPE;
  75     static {
  76         try {
  77             LOCK_INFO_COMPOSITE_TYPE = (CompositeType)
  78                 MappedMXBeanType.toOpenType(LockInfo.class);
  79         } catch (OpenDataException e) {
  80             // Should never reach here
  81             throw Util.newException(e);
  82         }
  83     }
  84 
  85     static CompositeType compositeType() {
  86         return LOCK_INFO_COMPOSITE_TYPE;
  87     }
  88 
  89     private static final String CLASS_NAME         = "className";
  90     private static final String IDENTITY_HASH_CODE = "identityHashCode";
  91 
  92     /*
  93      * Returns a LockInfo object mapped from the given CompositeData.
  94      */
  95     public static LockInfo toLockInfo(CompositeData cd) {
  96         if (cd == null) {
  97             throw new NullPointerException("Null CompositeData");
  98         }
  99 
 100         if (!isTypeMatched(LOCK_INFO_COMPOSITE_TYPE, cd.getCompositeType())) {
 101             throw new IllegalArgumentException(
 102                 "Unexpected composite type for LockInfo");
 103         }
 104 
 105         String className = getString(cd, CLASS_NAME);
 106         int identityHashCode = getInt(cd, IDENTITY_HASH_CODE);
 107         return new LockInfo(className, identityHashCode);
 108     }
 109 
 110     private static final long serialVersionUID = -6374759159749014052L;
 111 }