/*

 * Copyright (c) 2013, 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 8014477

 * @summary test String.contentEquals(StringBuffer)

 */

public class StringContentEqualsBug {

        volatile StringBuffer sb;

        volatile Exception exception;

        Task(StringBuffer sb) {

            this.sb = sb;

        }

        @Override

        public void run() {

            try {

                StringBuffer sb;

                while ((sb = this.sb) != null) {

                    doWith(sb);

                }

            }

            catch (Exception e) {

                exception = e;

            }

        }

        protected abstract void doWith(StringBuffer sb);

    }

    static class Tester extends Task {

        Tester(StringBuffer sb) {

            super(sb);

        }

        @Override

        protected void doWith(StringBuffer sb) {

            "AA".contentEquals(sb);

        }

    }

    static class Disturber extends Task {

        Disturber(StringBuffer sb) {

            super(sb);

        }

        @Override

        protected void doWith(StringBuffer sb) {

            sb.setLength(0);

            sb.trimToSize();

            sb.append("AA");

        }

    }

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

        StringBuffer sb = new StringBuffer();

        Task[] tasks = new Task[3];

        (tasks[0] = new Tester(sb)).start();

        for (int i = 1; i < tasks.length; i++) {

            (tasks[i] = new Disturber(sb)).start();

        }

        try

        {

            // wait at most 5 seconds for any of the threads to throw exception

            for (int i = 0; i < 20; i++) {

                for (Task task : tasks) {

                    if (task.exception != null) {

                        throw task.exception;

                    }

                }

                Thread.sleep(250L);

            }

        }

        finally {

            for (Task task : tasks) {

                task.sb = null;

                task.join();

            }

        }

    }

}