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
24import org.testng.annotations.Test;
25import org.testng.Assert;
26
27import java.util.concurrent.TimeUnit;
28import java.util.concurrent.locks.Condition;
29import java.util.concurrent.locks.ReentrantLock;
30
31import jdk.test.lib.process.OutputAnalyzer;
32import jdk.test.lib.dcmd.CommandExecutor;
33import jdk.test.lib.dcmd.PidJcmdExecutor;
34
35/*
36 * @test
37 * @summary
38 * @library /test/lib
39 * @modules java.base/jdk.internal.misc
40 * @modules java.xml
41 *          java.management
42 * @run testng FinalizerInfoTest
43 */
44public class FinalizerInfoTest {
45    static ReentrantLock lock = new ReentrantLock();
46    static volatile int wasInitialized = 0;
47    static volatile int wasTrapped = 0;
48    static final String cmd = "GC.finalizer_info";
49    static final int objectsCount = 1000;
50
51    class MyObject {
52        public MyObject() {
53            // Make sure object allocation/deallocation is not optimized out
54            wasInitialized += 1;
55        }
56
57        protected void finalize() {
58            // Trap the object in a finalization queue
59            wasTrapped += 1;
60            lock.lock();
61        }
62    }
63
64    public void run(CommandExecutor executor) {
65        try {
66            lock.lock();
67            for(int i = 0; i < objectsCount; ++i) {
68                new MyObject();
69            }
70            System.out.println("Objects initialized: " + objectsCount);
71            System.gc();
72
73            while(wasTrapped < 1) {
74                // Waiting for gc thread.
75            }
76
77            OutputAnalyzer output = executor.execute(cmd);
78            output.shouldContain("MyObject");
79        } finally {
80            lock.unlock();
81        }
82    }
83
84    @Test
85    public void pid() {
86        run(new PidJcmdExecutor());
87    }
88}
89