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 * @requires vm.hasJFR
46 * @library /test/lib /test/jdk
47 * @build jdk.jfr.event.runtime.TestClasses
48 * @run main/othervm jdk.jfr.event.runtime.TestClassLoaderStatsEvent
49 */
50 public class TestClassLoaderStatsEvent {
51 private final static String EVENT_NAME = EventNames.ClassLoaderStatistics;
52 private final static String CLASS_LOADER_NAME = "MyDummyClassLoader";
53 private final static String CLASSLOADER_TYPE_NAME = "jdk.jfr.event.runtime.TestClassLoaderStatsEvent$DummyClassLoader";
54 public static DummyClassLoader dummyloader;
55
56 public static void main(String[] args) throws Throwable {
57 createDummyClassLoader(CLASS_LOADER_NAME);
58
59 Recording recording = new Recording();
60 recording.enable(EVENT_NAME);
61 recording.start();
62 recording.stop();
63 List<RecordedEvent> consumer = Events.fromRecording(recording);
64 Events.hasEvents(consumer);
65
66 boolean isAnyFound = false;
67 for (RecordedEvent event : consumer) {
68 System.out.println("Event:" + event);
69 if (Events.assertField(event, "classLoader").getValue() == null) {
70 continue;
71 }
72 RecordedClassLoader recordedClassLoader = event.getValue("classLoader");
73 if (CLASSLOADER_TYPE_NAME.equals(recordedClassLoader.getType().getName())) {
74 Asserts.assertEquals(CLASS_LOADER_NAME, recordedClassLoader.getName(),
75 "Expected class loader name " + CLASS_LOADER_NAME + ", got name " + recordedClassLoader.getName());
76 Events.assertField(event, "classCount").equal(1L);
77 Events.assertField(event, "chunkSize").above(1L);
78 Events.assertField(event, "blockSize").above(1L);
79 Events.assertField(event, "unsafeAnonymousClassCount").equal(1L);
80 Events.assertField(event, "unsafeAnonymousChunkSize").above(1L);
81 Events.assertField(event, "unsafeAnonymousBlockSize").above(1L);
82 isAnyFound = true;
83 }
84 }
85 Asserts.assertTrue(isAnyFound, "No events found");
86 }
87
88 private static void createDummyClassLoader(String name) throws Throwable {
89 dummyloader = new DummyClassLoader(name);
90 Class<?> c = Class.forName(TestClass.class.getName(), true, dummyloader);
91 if (c.getClassLoader() != dummyloader) {
92 throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
93 }
94 }
95
96 public static class DummyClassLoader extends ClassLoader {
97
98 static ByteBuffer readClassFile(String name) {
99 String testClasses = System.getProperty("test.classes");
100 File f = new File(testClasses, name);
101 try (FileInputStream fin = new FileInputStream(f)) {
102 FileChannel fc = fin.getChannel();
103 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
104 } catch (IOException e) {
105 throw new RuntimeException("Can't open file: " + f, e);
106 }
107 }
108
109 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
110 Class<?> c;
111 if (TestClass.class.getName().equals(name)) {
112 c = findClass(name);
113 if (resolve) {
114 resolveClass(c);
115 }
116 } else {
117 c = super.loadClass(name, resolve);
118 }
119 return c;
120 }
121
122 protected Class<?> findClass(String name) throws ClassNotFoundException {
123 if (!TestClass.class.getName().equals(name)) {
124 throw new ClassNotFoundException("Unexpected class: " + name);
125 }
126 return defineClass(name, readClassFile(TestClass.class.getName().replace(".", File.separator) + ".class"), null);
127 }
128
129 public DummyClassLoader(String name) {
130 super(name, ClassLoader.getSystemClassLoader());
131 }
132 }
133 }