1 /*

     2  * Copyright (c) 2004, 2015, 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 com.sun.management.internal;

    27 

    28 import java.lang.management.MemoryUsage;

    29 import java.lang.reflect.Method;

    30 import java.lang.reflect.Field;

    31 import java.util.Map;

    32 import java.io.InvalidObjectException;

    33 import javax.management.openmbean.CompositeType;

    34 import javax.management.openmbean.CompositeData;

    35 import javax.management.openmbean.CompositeDataSupport;

    36 import javax.management.openmbean.TabularData;

    37 import javax.management.openmbean.SimpleType;

    38 import javax.management.openmbean.OpenType;

    39 import javax.management.openmbean.OpenDataException;

    40 import com.sun.management.GcInfo;

    41 import java.security.AccessController;

    42 import java.security.PrivilegedAction;

    43 import sun.management.LazyCompositeData;

    44 import static sun.management.LazyCompositeData.getLong;

    45 import sun.management.MappedMXBeanType;

    46 import sun.management.Util;

    47 

    48 /**

    49  * A CompositeData for GcInfo for the local management support.

    50  * This class avoids the performance penalty paid to the

    51  * construction of a CompositeData use in the local case.

    52  */

    53 public class GcInfoCompositeData extends LazyCompositeData {

    54     private final GcInfo info;

    55     private final GcInfoBuilder builder;

    56     private final Object[] gcExtItemValues;

    57 

    58     public GcInfoCompositeData(GcInfo info,

    59                         GcInfoBuilder builder,

    60                         Object[] gcExtItemValues) {

    61         this.info = info;

    62         this.builder = builder;

    63         this.gcExtItemValues = gcExtItemValues;

    64     }

    65 

    66     public GcInfo getGcInfo() {

    67         return info;

    68     }

    69 

    70     public static CompositeData toCompositeData(final GcInfo info) {

    71         final GcInfoBuilder builder = AccessController.doPrivileged (new PrivilegedAction<GcInfoBuilder>() {

    72                         public GcInfoBuilder run() {

    73                             try {

    74                                 Class<?> cl = Class.forName("com.sun.management.GcInfo");

    75                                 Field f = cl.getDeclaredField("builder");

    76                                 f.setAccessible(true);

    77                                 return (GcInfoBuilder)f.get(info);

    78                             } catch(ClassNotFoundException | NoSuchFieldException | IllegalAccessException e) {

    79                                 return null;

    80                             }

    81                         }

    82                     });

    83         final Object[] extAttr = AccessController.doPrivileged (new PrivilegedAction<Object[]>() {

    84                         public Object[] run() {

    85                             try {

    86                                 Class<?> cl = Class.forName("com.sun.management.GcInfo");

    87                                 Field f = cl.getDeclaredField("extAttributes");

    88                                 f.setAccessible(true);

    89                                 return (Object[])f.get(info);

    90                             } catch(ClassNotFoundException | NoSuchFieldException | IllegalAccessException e) {

    91                                 return null;

    92                             }

    93                         }

    94                     });

    95         GcInfoCompositeData gcicd =

    96             new GcInfoCompositeData(info,builder,extAttr);

    97         return gcicd.getCompositeData();

    98     }

    99 

   100     protected CompositeData getCompositeData() {

   101         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

   102         // baseGcInfoItemNames!

   103         final Object[] baseGcInfoItemValues;

   104 

   105         try {

   106             baseGcInfoItemValues = new Object[] {

   107                 info.getId(),

   108                 info.getStartTime(),

   109                 info.getEndTime(),

   110                 info.getDuration(),

   111                 memoryUsageMapType.toOpenTypeData(info.getMemoryUsageBeforeGc()),

   112                 memoryUsageMapType.toOpenTypeData(info.getMemoryUsageAfterGc()),

   113             };

   114         } catch (OpenDataException e) {

   115             // Should never reach here

   116             throw new AssertionError(e);

   117         }

   118 

   119         // Get the item values for the extension attributes

   120         final int gcExtItemCount = builder.getGcExtItemCount();

   121         if (gcExtItemCount == 0 &&

   122             gcExtItemValues != null && gcExtItemValues.length != 0) {

   123             throw new AssertionError("Unexpected Gc Extension Item Values");

   124         }

   125 

   126         if (gcExtItemCount > 0 && (gcExtItemValues == null ||

   127              gcExtItemCount != gcExtItemValues.length)) {

   128             throw new AssertionError("Unmatched Gc Extension Item Values");

   129         }

   130 

   131         Object[] values = new Object[baseGcInfoItemValues.length +

   132                                      gcExtItemCount];

   133         System.arraycopy(baseGcInfoItemValues, 0, values, 0,

   134                          baseGcInfoItemValues.length);

   135 

   136         if (gcExtItemCount > 0) {

   137             System.arraycopy(gcExtItemValues, 0, values,

   138                              baseGcInfoItemValues.length, gcExtItemCount);

   139         }

   140 

   141         try {

   142             return new CompositeDataSupport(builder.getGcInfoCompositeType(),

   143                                             builder.getItemNames(),

   144                                             values);

   145         } catch (OpenDataException e) {

   146             // Should never reach here

   147             throw new AssertionError(e);

   148         }

   149     }

   150 

   151     private static final String ID                     = "id";

   152     private static final String START_TIME             = "startTime";

   153     private static final String END_TIME               = "endTime";

   154     private static final String DURATION               = "duration";

   155     private static final String MEMORY_USAGE_BEFORE_GC = "memoryUsageBeforeGc";

   156     private static final String MEMORY_USAGE_AFTER_GC  = "memoryUsageAfterGc";

   157 

   158     private static final String[] baseGcInfoItemNames = {

   159         ID,

   160         START_TIME,

   161         END_TIME,

   162         DURATION,

   163         MEMORY_USAGE_BEFORE_GC,

   164         MEMORY_USAGE_AFTER_GC,

   165     };

   166 

   167 

   168     private static MappedMXBeanType memoryUsageMapType;

   169     static {

   170         try {

   171             Method m = GcInfo.class.getMethod("getMemoryUsageBeforeGc");

   172             memoryUsageMapType =

   173                 MappedMXBeanType.getMappedType(m.getGenericReturnType());

   174         } catch (NoSuchMethodException | OpenDataException e) {

   175             // Should never reach here

   176             throw new AssertionError(e);

   177         }

   178     }

   179 

   180     static String[] getBaseGcInfoItemNames() {

   181         return baseGcInfoItemNames;

   182     }

   183 

   184     private static OpenType<?>[] baseGcInfoItemTypes = null;

   185     static synchronized OpenType<?>[] getBaseGcInfoItemTypes() {

   186         if (baseGcInfoItemTypes == null) {

   187             OpenType<?> memoryUsageOpenType = memoryUsageMapType.getOpenType();

   188             baseGcInfoItemTypes = new OpenType<?>[] {

   189                 SimpleType.LONG,

   190                 SimpleType.LONG,

   191                 SimpleType.LONG,

   192                 SimpleType.LONG,

   193 

   194                 memoryUsageOpenType,

   195                 memoryUsageOpenType,

   196             };

   197         }

   198         return baseGcInfoItemTypes;

   199     }

   200 

   201     public static long getId(CompositeData cd) {

   202         return getLong(cd, ID);

   203     }

   204     public static long getStartTime(CompositeData cd) {

   205         return getLong(cd, START_TIME);

   206     }

   207     public static long getEndTime(CompositeData cd) {

   208         return getLong(cd, END_TIME);

   209     }

   210 

   211     public static Map<String, MemoryUsage>

   212             getMemoryUsageBeforeGc(CompositeData cd) {

   213         try {

   214             TabularData td = (TabularData) cd.get(MEMORY_USAGE_BEFORE_GC);

   215             return cast(memoryUsageMapType.toJavaTypeData(td));

   216         } catch (InvalidObjectException | OpenDataException e) {

   217             // Should never reach here

   218             throw new AssertionError(e);

   219         }

   220     }

   221 

   222     @SuppressWarnings("unchecked")

   223     public static Map<String, MemoryUsage> cast(Object x) {

   224         return (Map<String, MemoryUsage>) x;

   225     }

   226     public static Map<String, MemoryUsage>

   227             getMemoryUsageAfterGc(CompositeData cd) {

   228         try {

   229             TabularData td = (TabularData) cd.get(MEMORY_USAGE_AFTER_GC);

   230             //return (Map<String,MemoryUsage>)

   231             return cast(memoryUsageMapType.toJavaTypeData(td));

   232         } catch (InvalidObjectException | OpenDataException e) {

   233             // Should never reach here

   234             throw new AssertionError(e);

   235         }

   236     }

   237 

   238     /**

   239      * Returns true if the input CompositeData has the expected

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

   241      * names and types).  Otherwise, return false.

   242      */

   243     public static void validateCompositeData(CompositeData cd) {

   244         if (cd == null) {

   245             throw new NullPointerException("Null CompositeData");

   246         }

   247 

   248         if (!isTypeMatched(getBaseGcInfoCompositeType(),

   249                            cd.getCompositeType())) {

   250            throw new IllegalArgumentException(

   251                 "Unexpected composite type for GcInfo");

   252         }

   253     }

   254 

   255     // This is only used for validation.

   256     private static CompositeType baseGcInfoCompositeType = null;

   257     static synchronized CompositeType getBaseGcInfoCompositeType() {

   258         if (baseGcInfoCompositeType == null) {

   259             try {

   260                 baseGcInfoCompositeType =

   261                     new CompositeType("sun.management.BaseGcInfoCompositeType",

   262                                       "CompositeType for Base GcInfo",

   263                                       getBaseGcInfoItemNames(),

   264                                       getBaseGcInfoItemNames(),

   265                                       getBaseGcInfoItemTypes());

   266             } catch (OpenDataException e) {

   267                 // shouldn't reach here

   268                 throw new RuntimeException(e);

   269             }

   270         }

   271         return baseGcInfoCompositeType;

   272     }

   273 

   274     private static final long serialVersionUID = -5716428894085882742L;

   275 }