/*

 * 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

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 */

import java.lang.management.ManagementFactory;

import java.lang.ref.WeakReference;

import java.lang.reflect.Field;

import java.util.Collections;

import java.util.Map;

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.JMXPrincipal;

import javax.management.remote.JMXServiceURL;

import javax.management.remote.rmi.RMIConnector;

import javax.security.auth.Subject;

/*

 * @test

 * @bug 6566891

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

 * @author Shanliang JIANG

 * @modules java.management

 * @run clean RMIConnectorInternalMapTest

 * @run build RMIConnectorInternalMapTest

 * @run main RMIConnectorInternalMapTest

 */

public class RMIConnectorInternalMapTest {

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

        System.out.println("---RMIConnectorInternalMapTest 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 rmbscMapField = RMIConnector.class.getDeclaredField("rmbscMap");

            rmbscMapField.setAccessible(true);

            Map<Subject, WeakReference<MBeanServerConnection>> map =

                    (Map<Subject, WeakReference<MBeanServerConnection>>) rmbscMapField.get(connectorClient);

            if (map != null && !map.isEmpty()) { // failed

                throw new RuntimeException("RMIConnector's rmbscMap must be empty at the initial time.");

            }

            Subject delegationSubject =

                    new Subject(true,

                    Collections.singleton(new JMXPrincipal("delegate")),

                    Collections.EMPTY_SET,

                    Collections.EMPTY_SET);

            MBeanServerConnection mbsc1 =

                    connectorClient.getMBeanServerConnection(delegationSubject);

            MBeanServerConnection mbsc2 =

                    connectorClient.getMBeanServerConnection(delegationSubject);

            if (mbsc1 == null) {

                throw new RuntimeException("Got null connection.");

            }

            if (mbsc1 != mbsc2) {

                throw new RuntimeException("Not got same connection with a same subject.");

            }

            map = (Map<Subject, WeakReference<MBeanServerConnection>>) rmbscMapField.get(connectorClient);

            if (map == null || map.isEmpty()) { // failed

                throw new RuntimeException("RMIConnector's rmbscMap has wrong size "

                        + "after creating a delegated connection.");

            }

            delegationSubject = null;

            mbsc1 = null;

            mbsc2 = null;

            int i = 0;

            while (!map.isEmpty() && i++ < 60) {

                System.gc();

                Thread.sleep(100);

            }

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

            if (!map.isEmpty()) {

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

            } else {

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

            }

        } finally {

            try {

                connectorClient.close();

                connectorServer.stop();

            } catch (Exception e) {

            }

        }

    }

}