HotPotatoes.java revision 12745:f068a4ffddd2 
1/*
2 * Copyright (c) 2005, 2006, 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/*
25 * @test
26 * @bug 6355660 6347106 6394004
27 * @summary methods taking concurrently mutating collection should work
28 * @author Martin Buchholz
29 */
30
31import java.lang.reflect.*;
32import java.util.*;
33import java.util.concurrent.*;
34
35@SuppressWarnings("unchecked")
36public class HotPotatoes {
37    private static void realMain(String[] args) throws Throwable {
38        testImplementation(Vector.class);
39        testImplementation(ArrayList.class);
40        testImplementation(PriorityQueue.class);
41        testImplementation(PriorityBlockingQueue.class);
42    }
43
44    private static void testImplementation(Class<? extends Collection> implClazz)
45        throws Throwable
46    {
47        testPotato(implClazz, Vector.class);
48        testPotato(implClazz, CopyOnWriteArrayList.class);
49
50        final Constructor<? extends Collection> constr
51            = implClazz.getConstructor(Collection.class);
52        final Collection<Object> coll
53            = constr.newInstance(Arrays.asList(new String[] {}));
54        coll.add(1);
55        equal(coll.toString(), "[1]");
56    }
57
58    private static void testPotato(Class<? extends Collection> implClazz,
59                                   Class<? extends List> argClazz)
60        throws Throwable
61    {
62        try {
63            System.out.printf("implClazz=%s, argClazz=%s\n",
64                              implClazz.getName(), argClazz.getName());
65            final int iterations = 100000;
66            final List<Integer> list = (List<Integer>) argClazz.newInstance();
67            final Integer one = Integer.valueOf(1);
68            final List<Integer> oneElementList = Collections.singletonList(one);
69            final Constructor<? extends Collection> constr
70                = implClazz.getConstructor(Collection.class);
71            final Thread t = new CheckedThread() { public void realRun() {
72                for (int i = 0; i < iterations; i++) {
73                    list.add(one);
74                    list.remove(one);
75                }}};
76            t.setDaemon(true);
77            t.start();
78
79            for (int i = 0; i < iterations; i++) {
80                Collection<?> coll = constr.newInstance(list);
81                Object[] elts = coll.toArray();
82                check(elts.length == 0 ||
83                      (elts.length == 1 && elts[0] == one));
84            }
85        } catch (Throwable t) { unexpected(t); }
86    }
87
88    //--------------------- Infrastructure ---------------------------
89    static volatile int passed = 0, failed = 0;
90    static void pass() {passed++;}
91    static void fail() {failed++; Thread.dumpStack();}
92    static void fail(String msg) {System.out.println(msg); fail();}
93    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
94    static void check(boolean cond) {if (cond) pass(); else fail();}
95    static void equal(Object x, Object y) {
96        if (x == null ? y == null : x.equals(y)) pass();
97        else fail(x + " not equal to " + y);}
98    public static void main(String[] args) throws Throwable {
99        try {realMain(args);} catch (Throwable t) {unexpected(t);}
100        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
101        if (failed > 0) throw new AssertionError("Some tests failed");}
102    private abstract static class CheckedThread extends Thread {
103        public abstract void realRun() throws Throwable;
104        public void run() {
105            try { realRun(); } catch (Throwable t) { unexpected(t); }}}
106}
107