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/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6355660 6347106 6394004
* @summary methods taking concurrently mutating collection should work
* @author Martin Buchholz
*/
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.PriorityQueue;
import java.util.Vector;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.PriorityBlockingQueue;
@SuppressWarnings("unchecked")
public class HotPotatoes {
private static void realMain(String[] args) throws Throwable {
testImplementation(Vector.class);
testImplementation(ArrayList.class);
testImplementation(PriorityQueue.class);
testImplementation(PriorityBlockingQueue.class);
}
private static void testImplementation(Class<? extends Collection> implClazz)
throws Throwable
{
testPotato(implClazz, Vector.class);
testPotato(implClazz, CopyOnWriteArrayList.class);
final Constructor<? extends Collection> constr
= implClazz.getConstructor(Collection.class);
final Collection<Object> coll
= constr.newInstance(Arrays.asList(new String[] {}));
coll.add(1);
equal(coll.toString(), "[1]");
}
private static void testPotato(Class<? extends Collection> implClazz,
Class<? extends List> argClazz)
throws Throwable
{
try {
System.out.printf("implClazz=%s, argClazz=%s\n",
implClazz.getName(), argClazz.getName());
final int iterations = 100000;
final List<Integer> list = (List<Integer>)
argClazz.getDeclaredConstructor().newInstance();
final Integer one = Integer.valueOf(1);
final List<Integer> oneElementList = Collections.singletonList(one);
final Constructor<? extends Collection> constr
= implClazz.getConstructor(Collection.class);
final Thread t = new CheckedThread() { public void realRun() {
for (int i = 0; i < iterations; i++) {
list.add(one);
list.remove(one);
}}};
t.setDaemon(true);
t.start();
for (int i = 0; i < iterations; i++) {
Collection<?> coll = constr.newInstance(list);
Object[] elts = coll.toArray();
check(elts.length == 0 ||
(elts.length == 1 && elts[0] == one));
}
} catch (Throwable t) { unexpected(t); }
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
private abstract static class CheckedThread extends Thread {
public abstract void realRun() throws Throwable;
public void run() {
try { realRun(); } catch (Throwable t) { unexpected(t); }}}
}
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