1 /*
2 * Copyright (c) 2015, 2016, 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.process.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 /test/lib
36 * @modules java.base/jdk.internal.misc
37 * java.compiler
38 * java.management
39 * jdk.jvmstat/sun.jvmstat.monitor
40 * @run testng ClassHistogramTest
41 */
42 public class ClassHistogramTest {
43 public static class TestClass {}
44 public static TestClass[] instances = new TestClass[1024];
45 protected String classHistogramArgs = "";
46
47 static {
48 for (int i = 0; i < instances.length; ++i) {
49 instances[i] = new TestClass();
50 }
51 }
52
53 public void run(CommandExecutor executor) {
54 OutputAnalyzer output = executor.execute("GC.class_histogram " + classHistogramArgs);
55
56 /*
57 * example output:
58 * num #instances #bytes class name (module)
59 * -------------------------------------------------------
60 * 1: 7991 757792 [B (java.base@9-internal)
61 * 2: 1811 217872 java.lang.Class (java.base@9-internal)
62 * 3: 6724 215168 java.util.HashMap$Node (java.base@9-internal)
63 * 4: 7852 188448 java.lang.String (java.base@9-internal)
64 * 5: 1378 105040 [Ljava.util.HashMap$Node; (java.base@9-internal)
65 * 6: 1863 95096 [Ljava.lang.Object; (java.base@9-internal)
66
67 * ...
68 */
69
70 /* Require at least one java.lang.Class */
71 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Class \\(java.base@\\S*\\)\\s*$");
72
73 /* Require at least one java.lang.String */
74 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.String \\(java.base@\\S*\\)\\s*$");
75
76 /* Require at least one java.lang.Object */
77 output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Object \\(java.base@\\S*\\)\\s*$");
78
79 /* Require at exactly one TestClass[] */
80 output.shouldMatch("^\\s+\\d+:\\s+1\\s+\\d+\\s+" +
81 Pattern.quote(TestClass[].class.getName()) + "\\s*$");
82
83 /* Require at exactly 1024 TestClass */
84 output.shouldMatch("^\\s+\\d+:\\s+1024\\s+\\d+\\s+" +
85 Pattern.quote(TestClass.class.getName()) + "\\s*$");
86 }
87
88 @Test
89 public void jmx() {
90 run(new JMXExecutor());
91 }
92 }