1 /*

     2  * Copyright (c) 2005, 2012, 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.MonitorInfo;

    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 import java.util.Set;

    34 

    35 /**

    36  * A CompositeData for MonitorInfo 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 MonitorInfoCompositeData extends LazyCompositeData {

    41     private final MonitorInfo lock;

    42 

    43     private MonitorInfoCompositeData(MonitorInfo mi) {

    44         this.lock = mi;

    45     }

    46 

    47     public MonitorInfo getMonitorInfo() {

    48         return lock;

    49     }

    50 

    51     public static CompositeData toCompositeData(MonitorInfo mi) {

    52         MonitorInfoCompositeData micd = new MonitorInfoCompositeData(mi);

    53         return micd.getCompositeData();

    54     }

    55 

    56     protected CompositeData getCompositeData() {

    57         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

    58         // monitorInfoItemNames!

    59 

    60         int len = monitorInfoItemNames.length;

    61         Object[] values = new Object[len];

    62         CompositeData li = LockInfoCompositeData.toCompositeData(lock);

    63 

    64         for (int i = 0; i < len; i++) {

    65             String item = monitorInfoItemNames[i];

    66             if (item.equals(LOCKED_STACK_FRAME)) {

    67                 StackTraceElement ste = lock.getLockedStackFrame();

    68                 values[i] = (ste != null ? StackTraceElementCompositeData.

    69                                                toCompositeData(ste)

    70                                          : null);

    71             } else if (item.equals(LOCKED_STACK_DEPTH)) {

    72                 values[i] = lock.getLockedStackDepth();

    73             } else {

    74                 values[i] = li.get(item);

    75             }

    76         }

    77 

    78         try {

    79             return new CompositeDataSupport(monitorInfoCompositeType,

    80                                             monitorInfoItemNames,

    81                                             values);

    82         } catch (OpenDataException e) {

    83             // Should never reach here

    84             throw new AssertionError(e);

    85         }

    86     }

    87 

    88     private static final CompositeType monitorInfoCompositeType;

    89     private static final String[] monitorInfoItemNames;

    90     static {

    91         try {

    92             monitorInfoCompositeType = (CompositeType)

    93                 MappedMXBeanType.toOpenType(MonitorInfo.class);

    94             Set<String> s = monitorInfoCompositeType.keySet();

    95             monitorInfoItemNames =  s.toArray(new String[0]);

    96         } catch (OpenDataException e) {

    97             // Should never reach here

    98             throw new AssertionError(e);

    99         }

   100     }

   101 

   102     static CompositeType getMonitorInfoCompositeType() {

   103         return monitorInfoCompositeType;

   104     }

   105 

   106     private static final String CLASS_NAME         = "className";

   107     private static final String IDENTITY_HASH_CODE = "identityHashCode";

   108     private static final String LOCKED_STACK_FRAME = "lockedStackFrame";

   109     private static final String LOCKED_STACK_DEPTH = "lockedStackDepth";

   110 

   111     public static String getClassName(CompositeData cd) {

   112         return getString(cd, CLASS_NAME);

   113     }

   114 

   115     public static int getIdentityHashCode(CompositeData cd) {

   116         return getInt(cd, IDENTITY_HASH_CODE);

   117     }

   118 

   119     public static StackTraceElement getLockedStackFrame(CompositeData cd) {

   120         CompositeData ste = (CompositeData) cd.get(LOCKED_STACK_FRAME);

   121         if (ste != null) {

   122             return StackTraceElementCompositeData.from(ste);

   123         } else {

   124             return null;

   125         }

   126     }

   127 

   128     public static int getLockedStackDepth(CompositeData cd) {

   129         return getInt(cd, LOCKED_STACK_DEPTH);

   130     }

   131 

   132     /** Validate if the input CompositeData has the expected

   133      * CompositeType (i.e. contain all attributes with expected

   134      * names and types).

   135      */

   136     public static void validateCompositeData(CompositeData cd) {

   137         if (cd == null) {

   138             throw new NullPointerException("Null CompositeData");

   139         }

   140 

   141         if (!isTypeMatched(monitorInfoCompositeType, cd.getCompositeType())) {

   142             throw new IllegalArgumentException(

   143                 "Unexpected composite type for MonitorInfo");

   144         }

   145     }

   146 

   147     private static final long serialVersionUID = -5825215591822908529L;

   148 }