/*

 * Copyright 2005-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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.*;

import java.util.*;

import java.util.concurrent.*;

@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.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 static abstract class CheckedThread extends Thread {

        public abstract void realRun() throws Throwable;

        public void run() {

            try { realRun(); } catch (Throwable t) { unexpected(t); }}}

}