1 /*
2 * Copyright (c) 2015, 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 import org.testng.annotations.Test;
25
26 import java.util.regex.Pattern;
27
28 import jdk.test.lib.OutputAnalyzer;
29 import jdk.test.lib.dcmd.CommandExecutor;
30 import jdk.test.lib.dcmd.JMXExecutor;
31
32 /*
33 * @test
34 * @summary Test of diagnostic command GC.class_histogram
35 * @library /testlibrary
36 * @modules java.base/sun.misc
37 * java.compiler
38 * java.management
39 * jdk.jvmstat/sun.jvmstat.monitor
40 * @build jdk.test.lib.*
41 * @build jdk.test.lib.dcmd.*
42 * @run testng ClassHistogramTest
43 */
44 public class ClassHistogramTest {
45 public static class TestClass {}
46 public static TestClass[] instances = new TestClass[1024];
47 protected String classHistogramArgs = "";
48
49 static {
50 for (int i = 0; i < instances.length; ++i) {
51 instances[i] = new TestClass();
52 }
53 }
54
55 public void run(CommandExecutor executor) {
56 OutputAnalyzer output = executor.execute("GC.class_histogram " + classHistogramArgs);
57
58 /*
59 * example output:
60 * num #instances #bytes class name
61 * ----------------------------------------------
62 * 1: 1647 1133752 [B
63 * 2: 6198 383168 [C
64 * 3: 1464 165744 java.lang.Class
65 * 4: 6151 147624 java.lang.String
66 * 5: 2304 73728 java.util.concurrent.ConcurrentHashMap$Node
67 * 6: 1199 64280 [Ljava.lang.Object;
68 * ...
69 */
70
71 /* Require at least one java.lang.Class */
72 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Class\\s*$");
73
74 /* Require at least one java.lang.String */
75 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.String\\s*$");
76
77 /* Require at least one java.lang.Object */
78 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Object\\s*$");
79
80 /* Require at exactly one TestClass[] */
81 output.shouldMatch("^\\s+\\d+:\\s+1\\s+\\d+\\s+" +
82 Pattern.quote(TestClass[].class.getName()) + "\\s*$");
83
84 /* Require at exactly 1024 TestClass */
85 output.shouldMatch("^\\s+\\d+:\\s+1024\\s+\\d+\\s+" +
86 Pattern.quote(TestClass.class.getName()) + "\\s*$");
87 }
88
89 @Test
90 public void jmx() {
91 run(new JMXExecutor());
92 }
93 }