1 /*
2  * Copyright (c) 2013, 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 com.sun.beans.finder.ConstructorFinder;
25 
26 import java.lang.reflect.Constructor;
27 import java.util.ArrayList;
28 import java.util.Collections;
29 import java.util.List;
30 
31 /*
32  * @test
33  * @bug 8028054
34  * @summary Tests that cached constructors have synchronized access
35  * @author Sergey Malenkov
36  * @compile -XDignore.symbol.file TestConstructorFinder.java
37  * @run main TestConstructorFinder
38  */
39 
40 public class TestConstructorFinder {
main(String[] args)41     public static void main(String[] args) throws Exception {
42         List<Class<?>> classes = Task.getClasses(Integer.MAX_VALUE);
43         List<Constructor> constructors = new ArrayList<>();
44         for (Class<?> type : classes) {
45             Collections.addAll(constructors, type.getConstructors());
46         }
47         Task.print("found " + constructors.size() + " constructors in " + classes.size() + " classes");
48 
49         List<Task> tasks = new ArrayList<>();
50         for (int i = 0; i < 50; i++) {
51             tasks.add(new Task<Constructor>(constructors) {
52                 @Override
53                 protected void process(Constructor constructor) throws NoSuchMethodException {
54                     ConstructorFinder.findConstructor(constructor.getDeclaringClass(), constructor.getParameterTypes());
55                 }
56             });
57         }
58         int alarm = 0;
59         while (true) {
60             int alive = 0;
61             int working = 0;
62             for (Task task : tasks) {
63                 if (task.isWorking()) {
64                     working++;
65                     alive++;
66                 } else if (task.isAlive()) {
67                     alive++;
68                 }
69             }
70             if (alive == 0) {
71                 break;
72             }
73             Task.print(working + " out of " + alive + " threads are working");
74             if ((working == 0) && (++alarm == 10)) {
75                 Task.print("DEADLOCK DETECTED");
76                 System.exit(100);
77             }
78             Thread.sleep(1000);
79         }
80     }
81 }
82