1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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  * @modules java.desktop/com.sun.beans.finder
37  * @compile -XDignore.symbol.file TestConstructorFinder.java
38  * @run main TestConstructorFinder
39  */
40 
41 public class TestConstructorFinder {
main(String[] args)42     public static void main(String[] args) throws Exception {
43         List<Class<?>> classes = Task.getClasses(Integer.MAX_VALUE);
44         List<Constructor> constructors = new ArrayList<>();
45         for (Class<?> type : classes) {
46             Collections.addAll(constructors, type.getConstructors());
47         }
48         Task.print("found " + constructors.size() + " constructors in " + classes.size() + " classes");
49 
50         List<Task> tasks = new ArrayList<>();
51         for (int i = 0; i < 50; i++) {
52             tasks.add(new Task<Constructor>(constructors) {
53                 @Override
54                 protected void process(Constructor constructor) throws NoSuchMethodException {
55                     ConstructorFinder.findConstructor(constructor.getDeclaringClass(), constructor.getParameterTypes());
56                 }
57             });
58         }
59         int alarm = 0;
60         while (true) {
61             int alive = 0;
62             int working = 0;
63             for (Task task : tasks) {
64                 if (task.isWorking()) {
65                     working++;
66                     alive++;
67                 } else if (task.isAlive()) {
68                     alive++;
69                 }
70             }
71             if (alive == 0) {
72                 break;
73             }
74             Task.print(working + " out of " + alive + " threads are working");
75             if ((working == 0) && (++alarm == 10)) {
76                 throw new RuntimeException("FAIL - DEADLOCK DETECTED");
77             }
78             Thread.sleep(1000);
79         }
80     }
81 }
82