/*

 * 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

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 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Written by Doug Lea with assistance from members of JCP JSR-166

 * Expert Group and released to the public domain, as explained at

 * http://creativecommons.org/licenses/publicdomain

 */

import java.util.*;

import java.util.concurrent.*;

/*

 * @test

 * @bug 6805775 6815766

 * @summary Check weak consistency of concurrent queue iterators

 */

@SuppressWarnings({"unchecked", "rawtypes"})

public class IteratorWeakConsistency {

    void test(String[] args) throws Throwable {

        test(new LinkedBlockingQueue());

        test(new LinkedBlockingQueue(20));

        test(new LinkedBlockingDeque());

        test(new LinkedBlockingDeque(20));

        test(new ConcurrentLinkedQueue());

        // Other concurrent queues (e.g. ArrayBlockingQueue) do not

        // currently have weakly consistent iterators.

        // test(new ArrayBlockingQueue(20));

    }

    void test(Queue q) throws Throwable {

        // TODO: make this more general

        for (int i = 0; i < 10; i++)

            q.add(i);

        Iterator it = q.iterator();

        q.poll();

        q.poll();

        q.poll();

        q.remove(7);

        List list = new ArrayList();

        while (it.hasNext())

            list.add(it.next());

        equal(list, Arrays.asList(0, 3, 4, 5, 6, 8, 9));

        check(! list.contains(null));

        System.out.printf("%s: %s%n",

                          q.getClass().getSimpleName(),

                          list);

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

    static Class<?> thisClass = new Object(){}.getClass().getEnclosingClass();

    public static void main(String[] args) throws Throwable {

        new IteratorWeakConsistency().instanceMain(args);}

    public void instanceMain(String[] args) throws Throwable {

        try {test(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");}

}