1 /*
2 * Copyright (c) 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.oldobject;
27
28 import java.lang.reflect.Array;
29 import java.util.ArrayList;
30 import java.util.HashSet;
31 import java.util.List;
32 import java.util.Set;
33 import java.util.concurrent.Callable;
34
35 import jdk.jfr.Recording;
36 import jdk.jfr.consumer.RecordedEvent;
37 import jdk.jfr.consumer.RecordedObject;
38 import jdk.jfr.internal.test.WhiteBox;
39 import jdk.test.lib.jfr.EventNames;
40 import jdk.test.lib.jfr.Events;
41
42 /**
43 * @test
44 * @key jfr
45 *
46 *
47 * @library /lib /
48 *
49 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestObjectDescription
50 */
51 public class TestObjectDescription {
52
53 private static final int OBJECT_DESCRIPTION_MAX_SIZE = 100;
54 private static final String CLASS_NAME = TestClassLoader.class.getName() + "$TestClass";
55 public static List<?> leaks;
56
57 public final static class MyThreadGroup extends ThreadGroup {
58 public final static String NAME = "My Thread Group";
59
60 public MyThreadGroup(String name) {
61 super(name);
62 }
63
64 // Allocate array to trigger sampling code path for interpreter / c1
65 byte[] bytes = new byte[10];
66 }
67
68 public final static class MyThread extends Thread {
69 public final static String NAME = "My Thread";
70
71 public MyThread() {
72 super(NAME);
73 }
74
75 // Allocate array to trigger sampling code path for interpreter / c1
76 byte[] bytes = new byte[10];
77 }
78
79 public static void main(String[] args) throws Exception {
80 WhiteBox.setWriteAllObjectSamples(true);
81
82 testThreadGroupName();
83 testThreadName();
84 testClassName();
85 testSize();
86 testEllipsis();
87 }
88
89 private static void testThreadName() throws Exception {
90 asseertObjectDescription(() -> {
91 List<MyThread> threads = new ArrayList<>(OldObjects.MIN_SIZE);
92 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
93 threads.add(new MyThread());
94 }
95 return threads;
96 }, "Thread Name: " + MyThread.NAME);
97 }
98
99 private static void testThreadGroupName() throws Exception {
100 asseertObjectDescription(() -> {
101 List<MyThreadGroup> groups = new ArrayList<>(OldObjects.MIN_SIZE);
102 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
103 groups.add(new MyThreadGroup("My Thread Group"));
104 }
105 return groups;
106 }, "Thread Group: " + "My Thread Group");
107 }
108
109 private static void testClassName() throws Exception {
110 asseertObjectDescription(() -> {
111 TestClassLoader testClassLoader = new TestClassLoader();
112 List<Object> classObjects = new ArrayList<>(OldObjects.MIN_SIZE);
113 for (Class<?> clazz : testClassLoader.loadClasses(OldObjects.MIN_SIZE / 20)) {
114 // Allocate array to trigger sampling code path for interpreter / c1
115 for (int i = 0; i < 20; i++) {
116 Object classArray = Array.newInstance(clazz, 20);
117 Array.set(classArray, i, clazz.newInstance());
118 classObjects.add(classArray);
119 }
120 }
121 return classObjects;
122 }, "Class Name: " + CLASS_NAME);
123 }
124
125 private static void testSize() throws Exception {
126 asseertObjectDescription(() -> {
127 List<Object> arrayLists = new ArrayList<>(OldObjects.MIN_SIZE);
128 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
129 List<Object> arrayList = new ArrayList<>();
130 arrayList.add(new Object());
131 arrayList.add(new Object());
132 arrayList.add(new Object());
133 arrayLists.add(arrayList);
134 }
135 return arrayLists;
136 }, "Size: 3");
137 }
138
139 private static void testEllipsis() throws Exception {
140 asseertObjectDescription(() -> {
141 StringBuilder sb = new StringBuilder();
142 for (int i = 0; i < 2 * OBJECT_DESCRIPTION_MAX_SIZE; i++) {
143 sb.append("x");
144 }
145 String threadName = sb.toString();
146 List<Thread> threads = new ArrayList<>();
147 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
148 threads.add(new Thread(threadName));
149 }
150 return threads;
151 }, "xxx...");
152 }
153
154 private static void asseertObjectDescription(Callable<List<?>> callable, String text) throws Exception {
155 int iteration = 1;
156 while (true) {
157 try (Recording recording = new Recording()) {
158 System.out.println("Iteration: " + iteration);
159 recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
160 recording.start();
161 leaks = null;
162 System.gc();
163 leaks = callable.call();
164
165 recording.stop();
166
167 List<RecordedEvent> events = Events.fromRecording(recording);
168 Set<String> objectDescriptions = extractObjectDecriptions(events);
169 for (String s : objectDescriptions) {
170 if (s.contains(text)) {
171 printDescriptions(objectDescriptions);
172 return;
173 }
174 }
175 System.out.println("Could not find object description containing text \"" + text + "\"");
176 printDescriptions(objectDescriptions);
177 System.out.println();
178 iteration++;
179 }
180 }
181 }
182
183 private static void printDescriptions(Set<String> objectDescriptions) {
184 System.out.println("Found descriptions:");
185 for (String t : objectDescriptions) {
186 System.out.println(t);
187 }
188 }
189
190 private static Set<String> extractObjectDecriptions(List<RecordedEvent> events) {
191 Set<String> objectDescriptions = new HashSet<>();
192 for (RecordedEvent e : events) {
193 objectDescriptions.addAll(extractObjectDescriptions(e.getValue("object")));
194 }
195 return objectDescriptions;
196 }
197
198 private static Set<String> extractObjectDescriptions(RecordedObject o) {
199 Set<Long> visited = new HashSet<>();
200 Set<String> descriptions = new HashSet<>();
201 while (o != null) {
202 Long memoryAddress = o.getValue("address");
203 if (visited.contains(memoryAddress)) {
204 return descriptions;
205 }
206 visited.add(memoryAddress);
207 String od = o.getValue("description");
208 if (od != null) {
209 descriptions.add(od);
210 }
211 RecordedObject referrer = o.getValue("referrer");
212 o = referrer != null ? referrer.getValue("object") : null;
213 }
214 return descriptions;
215 }
216 }