1 /*
   2  * Copyright (c) 2014, 2020, 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.lang.reflect.Method;
  32 import java.nio.ByteBuffer;
  33 import java.nio.channels.FileChannel;
  34 import java.util.List;
  35 
  36 import jdk.jfr.Recording;
  37 import jdk.jfr.consumer.RecordedClassLoader;
  38 import jdk.jfr.consumer.RecordedEvent;
  39 import jdk.test.lib.Asserts;
  40 import jdk.test.lib.jfr.EventNames;
  41 import jdk.test.lib.jfr.Events;
  42 
  43 import jdk.test.lib.compiler.InMemoryJavaCompiler;
  44 
  45 /**
  46  * @test
  47  * @key jfr
  48  * @requires vm.hasJFR
  49  * @library /test/lib /test/jdk
  50  * @modules java.base/jdk.internal.misc
  51  *          java.compiler
  52  * @build jdk.jfr.event.runtime.TestClasses
  53  * @run main/othervm jdk.jfr.event.runtime.TestClassLoaderStatsEvent
  54  */
  55 public class TestClassLoaderStatsEvent {
  56     private final static String EVENT_NAME = EventNames.ClassLoaderStatistics;
  57     private final static String CLASS_LOADER_NAME = "MyDummyClassLoader";
  58     private final static String CLASSLOADER_TYPE_NAME = "jdk.jfr.event.runtime.TestClassLoaderStatsEvent$DummyClassLoader";
  59     public static DummyClassLoader dummyloader;
  60 
  61     public static void main(String[] args) throws Throwable {
  62         createDummyClassLoader(CLASS_LOADER_NAME);
  63 
  64         Recording recording = new Recording();
  65         recording.enable(EVENT_NAME);
  66         recording.start();
  67         recording.stop();
  68         List<RecordedEvent> consumer = Events.fromRecording(recording);
  69         Events.hasEvents(consumer);
  70 
  71         boolean isAnyFound = false;
  72         for (RecordedEvent event : consumer) {
  73             System.out.println("Event:" + event);
  74             if (Events.assertField(event, "classLoader").getValue() == null) {
  75                 continue;
  76             }
  77             RecordedClassLoader recordedClassLoader = event.getValue("classLoader");
  78             if (CLASSLOADER_TYPE_NAME.equals(recordedClassLoader.getType().getName())) {
  79                 Asserts.assertEquals(CLASS_LOADER_NAME, recordedClassLoader.getName(),
  80                     "Expected class loader name " + CLASS_LOADER_NAME + ", got name " + recordedClassLoader.getName());
  81                 Events.assertField(event, "classCount").equal(2L);
  82                 Events.assertField(event, "chunkSize").above(1L);
  83                 Events.assertField(event, "blockSize").above(1L);
  84                 Events.assertField(event, "unsafeAnonymousClassCount").equal(2L);
  85                 Events.assertField(event, "unsafeAnonymousChunkSize").above(0L);
  86                 Events.assertField(event, "unsafeAnonymousBlockSize").above(0L);
  87                 Events.assertField(event, "hiddenClassCount").equal(2L);
  88                 Events.assertField(event, "hiddenChunkSize").above(0L);
  89                 Events.assertField(event, "hiddenBlockSize").above(0L);
  90                 isAnyFound = true;
  91             }
  92         }
  93         Asserts.assertTrue(isAnyFound, "No events found");
  94     }
  95 
  96     private static void createDummyClassLoader(String name) throws Throwable {
  97         dummyloader = new DummyClassLoader(name);
  98         Class<?> c = Class.forName(TestClass.class.getName(), true, dummyloader);
  99         if (c.getClassLoader() != dummyloader) {
 100             throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
 101         }
 102 
 103         // Compile a class for method createNonFindableClasses() to use to create both a
 104         // weak hidden class and an anonymous class.
 105         byte klassbuf[] = InMemoryJavaCompiler.compile("jdk.jfr.event.runtime.TestClass",
 106             "package jdk.jfr.event.runtime; " +
 107             "public class TestClass { " +
 108             "    public static void concat(String one, String two) throws Throwable { " +
 109             " } } ");
 110 
 111         Method m = c.getDeclaredMethod("createNonFindableClasses", byte[].class);
 112         m.setAccessible(true);
 113         m.invoke(null, klassbuf);
 114     }
 115 
 116     public static class DummyClassLoader extends ClassLoader {
 117 
 118         static ByteBuffer readClassFile(String name) {
 119             String testClasses = System.getProperty("test.classes");
 120             File f = new File(testClasses, name);
 121             try (FileInputStream fin = new FileInputStream(f)) {
 122                 FileChannel fc = fin.getChannel();
 123                 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
 124             } catch (IOException e) {
 125                 throw new RuntimeException("Can't open file: " + f, e);
 126             }
 127         }
 128 
 129         protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
 130             Class<?> c;
 131             if (TestClass.class.getName().equals(name)) {
 132                 c = findClass(name);
 133                 if (resolve) {
 134                     resolveClass(c);
 135                 }
 136             } else {
 137                 c = super.loadClass(name, resolve);
 138             }
 139             return c;
 140         }
 141 
 142         protected Class<?> findClass(String name) throws ClassNotFoundException {
 143             if (!TestClass.class.getName().equals(name)) {
 144                 throw new ClassNotFoundException("Unexpected class: " + name);
 145             }
 146             return defineClass(name, readClassFile(TestClass.class.getName().replace(".", File.separator) + ".class"), null);
 147         }
 148 
 149         public DummyClassLoader(String name) {
 150             super(name, ClassLoader.getSystemClassLoader());
 151         }
 152     }
 153 }