1 /*

     2  * Copyright (c) 2004, 2014, 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.MemoryUsage;

    29 import java.lang.reflect.Method;

    30 import java.lang.reflect.Field;

    31 import java.util.Iterator;

    32 import java.util.Map;

    33 import java.util.HashMap;

    34 import java.util.List;

    35 import java.util.Collections;

    36 import java.io.InvalidObjectException;

    37 import javax.management.openmbean.CompositeType;

    38 import javax.management.openmbean.CompositeData;

    39 import javax.management.openmbean.CompositeDataSupport;

    40 import javax.management.openmbean.TabularData;

    41 import javax.management.openmbean.SimpleType;

    42 import javax.management.openmbean.OpenType;

    43 import javax.management.openmbean.OpenDataException;

    44 import com.sun.management.GcInfo;

    45 import com.sun.management.GarbageCollectionNotificationInfo;

    46 import java.security.AccessController;

    47 import java.security.PrivilegedAction;

    48 

    49 /**

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

    51  * This class avoids the performance penalty paid to the

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

    53  */

    54 public class GcInfoCompositeData extends LazyCompositeData {

    55     private final GcInfo info;

    56     private final GcInfoBuilder builder;

    57     private final Object[] gcExtItemValues;

    58 

    59     public GcInfoCompositeData(GcInfo info,

    60                         GcInfoBuilder builder,

    61                         Object[] gcExtItemValues) {

    62         this.info = info;

    63         this.builder = builder;

    64         this.gcExtItemValues = gcExtItemValues;

    65     }

    66 

    67     public GcInfo getGcInfo() {

    68         return info;

    69     }

    70 

    71     public static CompositeData toCompositeData(final GcInfo info) {

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

    73                         public GcInfoBuilder run() {

    74                             try {

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

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

    77                                 f.setAccessible(true);

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

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

    80                                 return null;

    81                             }

    82                         }

    83                     });

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

    85                         public Object[] run() {

    86                             try {

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

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

    89                                 f.setAccessible(true);

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

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

    92                                 return null;

    93                             }

    94                         }

    95                     });

    96         GcInfoCompositeData gcicd =

    97             new GcInfoCompositeData(info,builder,extAttr);

    98         return gcicd.getCompositeData();

    99     }

   100 

   101     protected CompositeData getCompositeData() {

   102         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

   103         // baseGcInfoItemNames!

   104         final Object[] baseGcInfoItemValues;

   105 

   106         try {

   107             baseGcInfoItemValues = new Object[] {

   108                 info.getId(),

   109                 info.getStartTime(),

   110                 info.getEndTime(),

   111                 info.getDuration(),

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

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

   114             };

   115         } catch (OpenDataException e) {

   116             // Should never reach here

   117             throw new AssertionError(e);

   118         }

   119 

   120         // Get the item values for the extension attributes

   121         final int gcExtItemCount = builder.getGcExtItemCount();

   122         if (gcExtItemCount == 0 &&

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

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

   125         }

   126 

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

   128              gcExtItemCount != gcExtItemValues.length)) {

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

   130         }

   131 

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

   133                                      gcExtItemCount];

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

   135                          baseGcInfoItemValues.length);

   136 

   137         if (gcExtItemCount > 0) {

   138             System.arraycopy(gcExtItemValues, 0, values,

   139                              baseGcInfoItemValues.length, gcExtItemCount);

   140         }

   141 

   142         try {

   143             return new CompositeDataSupport(builder.getGcInfoCompositeType(),

   144                                             builder.getItemNames(),

   145                                             values);

   146         } catch (OpenDataException e) {

   147             // Should never reach here

   148             throw new AssertionError(e);

   149         }

   150     }

   151 

   152     private static final String ID                     = "id";

   153     private static final String START_TIME             = "startTime";

   154     private static final String END_TIME               = "endTime";

   155     private static final String DURATION               = "duration";

   156     private static final String MEMORY_USAGE_BEFORE_GC = "memoryUsageBeforeGc";

   157     private static final String MEMORY_USAGE_AFTER_GC  = "memoryUsageAfterGc";

   158 

   159     private static final String[] baseGcInfoItemNames = {

   160         ID,

   161         START_TIME,

   162         END_TIME,

   163         DURATION,

   164         MEMORY_USAGE_BEFORE_GC,

   165         MEMORY_USAGE_AFTER_GC,

   166     };

   167 

   168 

   169     private static MappedMXBeanType memoryUsageMapType;

   170     static {

   171         try {

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

   173             memoryUsageMapType =

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

   175         } catch (NoSuchMethodException | OpenDataException e) {

   176             // Should never reach here

   177             throw new AssertionError(e);

   178         }

   179     }

   180 

   181     static String[] getBaseGcInfoItemNames() {

   182         return baseGcInfoItemNames;

   183     }

   184 

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

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

   187         if (baseGcInfoItemTypes == null) {

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

   189             baseGcInfoItemTypes = new OpenType<?>[] {

   190                 SimpleType.LONG,

   191                 SimpleType.LONG,

   192                 SimpleType.LONG,

   193                 SimpleType.LONG,

   194 

   195                 memoryUsageOpenType,

   196                 memoryUsageOpenType,

   197             };

   198         }

   199         return baseGcInfoItemTypes;

   200     }

   201 

   202     public static long getId(CompositeData cd) {

   203         return getLong(cd, ID);

   204     }

   205     public static long getStartTime(CompositeData cd) {

   206         return getLong(cd, START_TIME);

   207     }

   208     public static long getEndTime(CompositeData cd) {

   209         return getLong(cd, END_TIME);

   210     }

   211 

   212     public static Map<String, MemoryUsage>

   213             getMemoryUsageBeforeGc(CompositeData cd) {

   214         try {

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

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

   217         } catch (InvalidObjectException | OpenDataException e) {

   218             // Should never reach here

   219             throw new AssertionError(e);

   220         }

   221     }

   222 

   223     @SuppressWarnings("unchecked")

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

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

   226     }

   227     public static Map<String, MemoryUsage>

   228             getMemoryUsageAfterGc(CompositeData cd) {

   229         try {

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

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

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

   233         } catch (InvalidObjectException | OpenDataException e) {

   234             // Should never reach here

   235             throw new AssertionError(e);

   236         }

   237     }

   238 

   239     /**

   240      * Returns true if the input CompositeData has the expected

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

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

   243      */

   244     public static void validateCompositeData(CompositeData cd) {

   245         if (cd == null) {

   246             throw new NullPointerException("Null CompositeData");

   247         }

   248 

   249         if (!isTypeMatched(getBaseGcInfoCompositeType(),

   250                            cd.getCompositeType())) {

   251            throw new IllegalArgumentException(

   252                 "Unexpected composite type for GcInfo");

   253         }

   254     }

   255 

   256     // This is only used for validation.

   257     private static CompositeType baseGcInfoCompositeType = null;

   258     static synchronized CompositeType getBaseGcInfoCompositeType() {

   259         if (baseGcInfoCompositeType == null) {

   260             try {

   261                 baseGcInfoCompositeType =

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

   263                                       "CompositeType for Base GcInfo",

   264                                       getBaseGcInfoItemNames(),

   265                                       getBaseGcInfoItemNames(),

   266                                       getBaseGcInfoItemTypes());

   267             } catch (OpenDataException e) {

   268                 // shouldn't reach here

   269                 throw Util.newException(e);

   270             }

   271         }

   272         return baseGcInfoCompositeType;

   273     }

   274 

   275     private static final long serialVersionUID = -5716428894085882742L;

   276 }