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 * jdk.compiler
52 * jdk.jfr
53 * @build jdk.jfr.event.runtime.TestClasses
54 * @run main/othervm jdk.jfr.event.runtime.TestClassLoaderStatsEvent
55 */
56 public class TestClassLoaderStatsEvent {
57 private final static String EVENT_NAME = EventNames.ClassLoaderStatistics;
58 private final static String CLASS_LOADER_NAME = "MyDummyClassLoader";
59 private final static String CLASSLOADER_TYPE_NAME = "jdk.jfr.event.runtime.TestClassLoaderStatsEvent$DummyClassLoader";
60 public static DummyClassLoader dummyloader;
61
62 public static void main(String[] args) throws Throwable {
63 createDummyClassLoader(CLASS_LOADER_NAME);
64
65 Recording recording = new Recording();
66 recording.enable(EVENT_NAME);
67 recording.start();
68 recording.stop();
69 List<RecordedEvent> consumer = Events.fromRecording(recording);
70 Events.hasEvents(consumer);
71
72 boolean isAnyFound = false;
73 for (RecordedEvent event : consumer) {
74 System.out.println("Event:" + event);
75 if (Events.assertField(event, "classLoader").getValue() == null) {
76 continue;
77 }
78 RecordedClassLoader recordedClassLoader = event.getValue("classLoader");
79 if (CLASSLOADER_TYPE_NAME.equals(recordedClassLoader.getType().getName())) {
80 Asserts.assertEquals(CLASS_LOADER_NAME, recordedClassLoader.getName(),
81 "Expected class loader name " + CLASS_LOADER_NAME + ", got name " + recordedClassLoader.getName());
82 Events.assertField(event, "classCount").equal(2L);
83 Events.assertField(event, "chunkSize").above(1L);
84 Events.assertField(event, "blockSize").above(1L);
85 // Hidden classes stats include both hidden and unsafe anonymous classes.
86 Events.assertField(event, "hiddenClassCount").equal(4L);
87 Events.assertField(event, "hiddenChunkSize").above(0L);
88 Events.assertField(event, "hiddenBlockSize").above(0L);
89 isAnyFound = true;
90 }
91 }
92 Asserts.assertTrue(isAnyFound, "No events found");
93 }
94
95 private static void createDummyClassLoader(String name) throws Throwable {
96 dummyloader = new DummyClassLoader(name);
97 Class<?> c = Class.forName(TestClass.class.getName(), true, dummyloader);
98 if (c.getClassLoader() != dummyloader) {
99 throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
100 }
101
102 // Compile a class for method createNonFindableClasses() to use to create both a
103 // weak hidden class and an anonymous class.
104 byte klassbuf[] = InMemoryJavaCompiler.compile("jdk.jfr.event.runtime.TestClass",
105 "package jdk.jfr.event.runtime; " +
106 "public class TestClass { " +
107 " public static void concat(String one, String two) throws Throwable { " +
108 " } } ");
109
110 Method m = c.getDeclaredMethod("createNonFindableClasses", byte[].class);
111 m.setAccessible(true);
112 m.invoke(null, klassbuf);
113 }
114
115 public static class DummyClassLoader extends ClassLoader {
116
117 static ByteBuffer readClassFile(String name) {
118 String testClasses = System.getProperty("test.classes");
119 File f = new File(testClasses, name);
120 try (FileInputStream fin = new FileInputStream(f)) {
121 FileChannel fc = fin.getChannel();
122 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
123 } catch (IOException e) {
124 throw new RuntimeException("Can't open file: " + f, e);
125 }
126 }
127
128 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
129 Class<?> c;
130 if (TestClass.class.getName().equals(name)) {
131 c = findClass(name);
132 if (resolve) {
133 resolveClass(c);
134 }
135 } else {
136 c = super.loadClass(name, resolve);
137 }
138 return c;
139 }
140
141 protected Class<?> findClass(String name) throws ClassNotFoundException {
142 if (!TestClass.class.getName().equals(name)) {
143 throw new ClassNotFoundException("Unexpected class: " + name);
144 }
145 return defineClass(name, readClassFile(TestClass.class.getName().replace(".", File.separator) + ".class"), null);
146 }
147
148 public DummyClassLoader(String name) {
149 super(name, ClassLoader.getSystemClassLoader());
150 }
151 }
152 }