Java example source code file (ChangingNotifsTest.java)

This example Java source code file (ChangingNotifsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

base, changingnotifstest, descriptor, emptymbean, emptymxbean, exception, failed, management, mbeaninfo, mbeannotificationinfo, mbeanserver, notificationbroadcastersupport, objectname, override, string, util

The ChangingNotifsTest.java Java example source code

/*
 * Copyright (c) 2005, 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 6175517
 * @summary Check that Standard MBeans can change their MBeanNotificationInfo[]
 * and MXBeans cannot
 * @author Eamonn McManus
 * @run clean ChangingNotifsTest
 * @run build ChangingNotifsTest
 * @run main ChangingNotifsTest
 */

import javax.management.*;
import java.util.Arrays;

public class ChangingNotifsTest {
    public static interface EmptyMBean {}

    public static interface EmptyMXBean {}

    public static class Base extends NotificationBroadcasterSupport {
        @Override
        public MBeanNotificationInfo[] getNotificationInfo() {
            MBeanNotificationInfo inf =
                new MBeanNotificationInfo(new String[0],
                                          Integer.toString(++called),
                                          "description");
            return new MBeanNotificationInfo[] {inf};
        }

        private static int called;
    }

    public static class Empty extends Base implements EmptyMBean {}

    public static class EmptyMX extends Base implements EmptyMXBean {}

    public static void main(String[] args) throws Exception {
        MBeanServer mbs = MBeanServerFactory.newMBeanServer();
        ObjectName name = new ObjectName("a:b=c");
        for (boolean mx : new boolean[] {false, true})
            test(mbs, name, mx);
        if (failure != null)
            throw new Exception(failure);
        System.out.println("TEST PASSED");
    }

    private static void test(MBeanServer mbs, ObjectName name, boolean mx)
            throws Exception {
        Object mbean = mx ? new EmptyMX() : new Empty();
        String what = mx ? "MXBean" : "Standard MBean";
        mbs.registerMBean(mbean, name);
        try {
            MBeanInfo mbi = mbs.getMBeanInfo(name);
            Descriptor d = mbi.getDescriptor();
            String immut = (String) d.getFieldValue("immutableInfo");
            boolean immutable = (immut != null && immut.equals("true"));
            if (immutable != mx) {
                fail(what + " has immutableInfo=" + immut + ", should be " +
                     mx);
                return;
            }
            MBeanNotificationInfo[] n1 = mbi.getNotifications().clone();
            mbi = mbs.getMBeanInfo(name);
            boolean unchanged = Arrays.deepEquals(mbi.getNotifications(), n1);
            if (unchanged != mx) {
                fail(what + " notif info " +
                     (unchanged ? "did not change" : "changed"));
                return;
            }
            System.out.println("OK: " + what);
        } finally {
            mbs.unregisterMBean(name);
        }
    }

    private static void fail(String why) {
        failure = "FAILED: " + why;
        System.out.println(failure);
    }

    private static String failure;
}