1 /*
2 * Copyright (c) 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 *
27 * @build ClassLoaderStatsTest DcmdUtil
28 * @run main ClassLoaderStatsTest
29 */
30
31 import java.io.BufferedReader;
32 import java.io.File;
33 import java.io.FileInputStream;
34 import java.io.IOException;
35 import java.io.StringReader;
36 import java.nio.ByteBuffer;
37 import java.nio.channels.FileChannel;
38 import java.util.regex.Matcher;
39 import java.util.regex.Pattern;
40
41 public class ClassLoaderStatsTest {
42
43 // ClassLoader Parent CLD* Classes ChunkSz BlockSz Type
44 // 0x00000007c0215928 0x0000000000000000 0x0000000000000000 0 0 0 org.eclipse.osgi.baseadaptor.BaseAdaptor$1
45 // 0x00000007c0009868 0x0000000000000000 0x00007fc52aebcc80 1 6144 3768 sun.reflect.DelegatingClassLoader
46 // 0x00000007c0009868 0x0000000000000000 0x00007fc52b8916d0 1 6144 3688 sun.reflect.DelegatingClassLoader
47 // 0x00000007c0009868 0x00000007c0038ba8 0x00007fc52afb8760 1 6144 3688 sun.reflect.DelegatingClassLoader
48 // 0x00000007c0009868 0x0000000000000000 0x00007fc52afbb1a0 1 6144 3688 sun.reflect.DelegatingClassLoader
49 // 0x0000000000000000 0x0000000000000000 0x00007fc523416070 5019 30060544 29956216 <boot classloader>
50 // 455 1210368 672848 + unsafe anonymous classes
51 // 0x00000007c016b5c8 0x00000007c0038ba8 0x00007fc52a995000 5 8192 5864 org.netbeans.StandardModule$OneModuleClassLoader
52 // 0x00000007c0009868 0x00000007c016b5c8 0x00007fc52ac13640 1 6144 3896 sun.reflect.DelegatingClassLoader
53 // ...
54
55 static Pattern clLine = Pattern.compile("0x\\p{XDigit}*\\s*0x\\p{XDigit}*\\s*0x\\p{XDigit}*\\s*(\\d*)\\s*(\\d*)\\s*(\\d*)\\s*(.*)");
56 static Pattern anonLine = Pattern.compile("\\s*(\\d*)\\s*(\\d*)\\s*(\\d*)\\s*.*");
57
58 public static DummyClassLoader dummyloader;
59
60 public static void main(String arg[]) throws Exception {
61
62 // create a classloader and load our special class
63 dummyloader = new DummyClassLoader();
64 Class<?> c = Class.forName("TestClass", true, dummyloader);
65 if (c.getClassLoader() != dummyloader) {
66 throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
67 }
68
69 String result = DcmdUtil.executeDcmd("VM.classloader_stats");
70 BufferedReader r = new BufferedReader(new StringReader(result));
71 String line;
72 while((line = r.readLine()) != null) {
73 Matcher m = clLine.matcher(line);
74 if (m.matches()) {
75 // verify that DummyClassLoader has loaded 1 class and 1 anonymous class
76 if (m.group(4).equals("ClassLoaderStatsTest$DummyClassLoader")) {
77 System.out.println("line: " + line);
78 if (!m.group(1).equals("1")) {
79 throw new Exception("Should have loaded 1 class: " + line);
80 }
81 checkPositiveInt(m.group(2));
82 checkPositiveInt(m.group(3));
83
84 String next = r.readLine();
85 System.out.println("next: " + next);
86 Matcher m1 = anonLine.matcher(next);
87 m1.matches();
88 if (!m1.group(1).equals("1")) {
89 throw new Exception("Should have loaded 1 anonymous class, but found : " + m1.group(1));
90 }
91 checkPositiveInt(m1.group(2));
92 checkPositiveInt(m1.group(3));
93 }
94 }
95 }
96 }
97
98 private static void checkPositiveInt(String s) throws Exception {
99 if (Integer.parseInt(s) <= 0) {
100 throw new Exception("Value should have been > 0: " + s);
101 }
102 }
103
104 public static class DummyClassLoader extends ClassLoader {
105
106 public static final String CLASS_NAME = "TestClass";
107
108 static ByteBuffer readClassFile(String name)
109 {
110 File f = new File(System.getProperty("test.classes", "."),
111 name);
112 try (FileInputStream fin = new FileInputStream(f);
113 FileChannel fc = fin.getChannel())
114 {
115 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
116 } catch (IOException e) {
117 throw new RuntimeException("Can't open file: " + name, e);
118 }
119 }
120
121 protected Class<?> loadClass(String name, boolean resolve)
122 throws ClassNotFoundException
123 {
124 Class<?> c;
125 if (!"TestClass".equals(name)) {
126 c = super.loadClass(name, resolve);
127 } else {
128 // should not delegate to the system class loader
129 c = findClass(name);
130 if (resolve) {
131 resolveClass(c);
132 }
133 }
134 return c;
135 }
136
137 protected Class<?> findClass(String name)
138 throws ClassNotFoundException
139 {
140 if (!"TestClass".equals(name)) {
141 throw new ClassNotFoundException("Unexpected class: " + name);
142 }
143 return defineClass(name, readClassFile(name + ".class"), null);
144 }
145 } /* DummyClassLoader */
146
147 }
148
149 class TestClass {
150 static {
151 // force creation of anonymous class (for the lambdaform)
152 Runnable r = () -> System.out.println("Hello");
153 r.run();
154 }
155 }