1 /*

     2  * Copyright (c) 2014, 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 jdk.jfr.event.runtime;

    27 

    28 import java.io.File;

    29 import java.io.FileInputStream;

    30 import java.io.IOException;

    31 import java.nio.ByteBuffer;

    32 import java.nio.channels.FileChannel;

    33 import java.util.List;

    34 

    35 import jdk.jfr.Recording;

    36 import jdk.jfr.consumer.RecordedClassLoader;

    37 import jdk.jfr.consumer.RecordedEvent;

    38 import jdk.test.lib.Asserts;

    39 import jdk.test.lib.jfr.EventNames;

    40 import jdk.test.lib.jfr.Events;

    41 

    42 /*

    43  * @test

    44  * @key jfr

    45  * @library /test/lib /test/jdk

    46  * @build jdk.jfr.event.runtime.TestClasses

    47  * @run main/othervm jdk.jfr.event.runtime.TestClassLoaderStatsEvent

    48  */

    49 public class TestClassLoaderStatsEvent {

    50     private final static String EVENT_NAME = EventNames.ClassLoaderStatistics;

    51     private final static String CLASS_LOADER_NAME = "MyDummyClassLoader";

    52     private final static String CLASSLOADER_TYPE_NAME = "jdk.jfr.event.runtime.TestClassLoaderStatsEvent$DummyClassLoader";

    53     public static DummyClassLoader dummyloader;

    54 

    55     public static void main(String[] args) throws Throwable {

    56         createDummyClassLoader(CLASS_LOADER_NAME);

    57 

    58         Recording recording = new Recording();

    59         recording.enable(EVENT_NAME);

    60         recording.start();

    61         recording.stop();

    62         List<RecordedEvent> consumer = Events.fromRecording(recording);

    63         Events.hasEvents(consumer);

    64 

    65         boolean isAnyFound = false;

    66         for (RecordedEvent event : consumer) {

    67             System.out.println("Event:" + event);

    68             if (Events.assertField(event, "classLoader").getValue() == null) {

    69                 continue;

    70             }

    71             RecordedClassLoader recordedClassLoader = event.getValue("classLoader");

    72             if (CLASSLOADER_TYPE_NAME.equals(recordedClassLoader.getType().getName())) {

    73                 Asserts.assertEquals(CLASS_LOADER_NAME, recordedClassLoader.getName(),

    74                     "Expected class loader name " + CLASS_LOADER_NAME + ", got name " + recordedClassLoader.getName());

    75                 Events.assertField(event, "classCount").equal(1L);

    76                 Events.assertField(event, "chunkSize").above(1L);

    77                 Events.assertField(event, "blockSize").above(1L);

    78                 Events.assertField(event, "anonymousClassCount").equal(1L);

    79                 Events.assertField(event, "anonymousChunkSize").above(1L);

    80                 Events.assertField(event, "anonymousBlockSize").above(1L);

    81                 isAnyFound = true;

    82             }

    83         }

    84         Asserts.assertTrue(isAnyFound, "No events found");

    85     }

    86 

    87     private static void createDummyClassLoader(String name) throws Throwable {

    88         dummyloader = new DummyClassLoader(name);

    89         Class<?> c = Class.forName(TestClass.class.getName(), true, dummyloader);

    90         if (c.getClassLoader() != dummyloader) {

    91             throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());

    92         }

    93     }

    94 

    95     public static class DummyClassLoader extends ClassLoader {

    96 

    97         static ByteBuffer readClassFile(String name) {

    98             String testClasses = System.getProperty("test.classes");

    99             File f = new File(testClasses, name);

   100             try (FileInputStream fin = new FileInputStream(f)) {

   101                 FileChannel fc = fin.getChannel();

   102                 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

   103             } catch (IOException e) {

   104                 throw new RuntimeException("Can't open file: " + f, e);

   105             }

   106         }

   107 

   108         protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {

   109             Class<?> c;

   110             if (TestClass.class.getName().equals(name)) {

   111                 c = findClass(name);

   112                 if (resolve) {

   113                     resolveClass(c);

   114                 }

   115             } else {

   116                 c = super.loadClass(name, resolve);

   117             }

   118             return c;

   119         }

   120 

   121         protected Class<?> findClass(String name) throws ClassNotFoundException {

   122             if (!TestClass.class.getName().equals(name)) {

   123                 throw new ClassNotFoundException("Unexpected class: " + name);

   124             }

   125             return defineClass(name, readClassFile(TestClass.class.getName().replace(".", File.separator) + ".class"), null);

   126         }

   127 

   128         public DummyClassLoader(String name) {

   129             super(name, ClassLoader.getSystemClassLoader());

   130         }

   131     }

   132 }