/*

 * Copyright (c) 2013, 2015, 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.

 */

import java.lang.management.ManagementFactory;

import java.lang.ref.WeakReference;

import java.lang.reflect.Field;

import javax.management.MBeanServer;

import javax.management.MBeanServerConnection;

import javax.management.remote.JMXConnector;

import javax.management.remote.JMXConnectorFactory;

import javax.management.remote.JMXConnectorServer;

import javax.management.remote.JMXConnectorServerFactory;

import javax.management.remote.JMXServiceURL;

import javax.management.remote.rmi.RMIConnector;

/*

 * @test

 * @bug 6566891

 * @summary Check no memory leak on RMIConnector's nullSubjectConn

 * @author Shanliang JIANG

 * @modules java.management

 * @run clean RMIConnectorNullSubjectConnTest

 * @run build RMIConnectorNullSubjectConnTest

 * @run main RMIConnectorNullSubjectConnTest

 */

public class RMIConnectorNullSubjectConnTest {

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

        System.out.println("---RMIConnectorNullSubjectConnTest starting...");

        JMXConnectorServer connectorServer = null;

        JMXConnector connectorClient = null;

        try {

            MBeanServer mserver = ManagementFactory.getPlatformMBeanServer();

            JMXServiceURL serverURL = new JMXServiceURL("rmi", "localhost", 0);

            connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(serverURL, null, mserver);

            connectorServer.start();

            JMXServiceURL serverAddr = connectorServer.getAddress();

            connectorClient = JMXConnectorFactory.connect(serverAddr, null);

            connectorClient.connect();

            Field nullSubjectConnField = RMIConnector.class.getDeclaredField("nullSubjectConnRef");

            nullSubjectConnField.setAccessible(true);

            WeakReference<MBeanServerConnection> weak =

                    (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient);

            if (weak != null && weak.get() != null) {

                throw new RuntimeException("nullSubjectConnRef must be null at initial time.");

            }

            MBeanServerConnection conn1 = connectorClient.getMBeanServerConnection(null);

            MBeanServerConnection conn2 = connectorClient.getMBeanServerConnection(null);

            if (conn1 == null) {

                throw new RuntimeException("A connection with null subject should not be null.");

            } else if (conn1 != conn2) {

                throw new RuntimeException("The 2 connections with null subject are not equal.");

            }

            conn1 = null;

            conn2 = null;

            int i = 1;

            do {

                System.gc();

                Thread.sleep(100);

                weak = (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient);

            } while ((weak != null && weak.get() != null) && i++ < 60);

            System.out.println("---GC times: " + i);

            if (weak != null && weak.get() != null) {

                throw new RuntimeException("Failed to clean RMIConnector's nullSubjectConn");

            } else {

                System.out.println("---RMIConnectorNullSubjectConnTest: PASSED!");

            }

        } finally {

            try {

                connectorClient.close();

                connectorServer.stop();

            } catch (Exception e) {

            }

        }

    }

}