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