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 

    31 import java.lang.reflect.*;

    32 import java.util.*;

    33 import java.util.concurrent.*;

    34 

    35 @SuppressWarnings("unchecked")

    36 public 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 }