/*

 * Copyright (c) 2003, 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 4893489

 * @summary     Subject.doAs not thread-safe against changes to principals

 */

import java.security.Principal;

import java.security.PrivilegedAction;

import java.util.Collections;

import java.util.Set;

import javax.security.auth.Subject;

import javax.security.auth.x500.X500Principal;

public class Synch {

    public static void main(String[] args) {

        Subject subject = new Subject();

        final Set principals = subject.getPrincipals();

        principals.add(new X500Principal("CN=Alice"));

        new Thread() {

            { setDaemon(true); }

            public void run() {

                Principal last = new X500Principal("CN=Bob");

                for (int i = 0; true; i++) {

                    Principal next = new X500Principal("CN=Bob" + i);

                    principals.add(next);

                    principals.remove(last);

                    last = next;

                }

            }

        }.start();

        for (int i = 0; i < 1000; i++) {

            Subject.doAs(

                subject,

                new PrivilegedAction() {

                    public Object run() {

                        return Subject.doAs(

                            new Subject(true,

                                        Collections.singleton(

                                            new X500Principal("CN=Claire")),

                                        Collections.EMPTY_SET,

                                        Collections.EMPTY_SET),

                            new PrivilegedAction() {

                                public Object run() {

                                    return null;

                                }

                            });

                    }

                });

        }

    }

}