Java example source code file (ProxyObjectMethodsTest.java)

This example Java source code file (ProxyObjectMethodsTest.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

arraylist, cannot, illegalargumentexception, jmxconnectorserver, jmxserviceurl, management, null, objectname, reflection, runtimeexception, simplembean, simplest, string, test\-tostring, testmbean, the, util

The ProxyObjectMethodsTest.java Java example source code

/*
 * Copyright (c) 2004, 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 6177524
 * @summary Test how to execute the 3 Object methods by a Proxy.
 * @author Shanliang JIANG
 * @run clean ProxyObjectMethodsTest
 * @run build ProxyObjectMethodsTest
 * @run main ProxyObjectMethodsTest
 */

import java.lang.management.ManagementFactory;
import java.lang.reflect.*;
import java.util.*;

import javax.management.*;
import javax.management.remote.*;

public class ProxyObjectMethodsTest {

    public static void main(String[] args) throws Exception {
        System.out.println("<<< Test how to execute the 3 Object methods by a Proxy.");

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        final ObjectName name = new ObjectName(":class=Simple");

        JMXServiceURL url = new JMXServiceURL("rmi", null, 0);
        final JMXConnectorServer server =
            JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);
        server.start();
        url = server.getAddress();

        final JMXConnector client = JMXConnectorFactory.connect(url);

        System.out.println("<<< Test the methods at local side.");

        final Simple simple = new Simple();
        mbs.registerMBean(simple, name);

        SimpleMBean simple0 =
            MBeanServerInvocationHandler.newProxyInstance(client.getMBeanServerConnection(),
                                                          name,
                                                          SimpleMBean.class,
                                                          false);

        SimpleMBean simple1 =
            MBeanServerInvocationHandler.newProxyInstance(client.getMBeanServerConnection(),
                                                          name,
                                                          SimpleMBean.class,
                                                          false);

        Simplest simple3 =
            MBeanServerInvocationHandler.newProxyInstance(client.getMBeanServerConnection(),
                                                          name,
                                                          Simplest.class,
                                                          false);

        if (!simple0.equals(simple1) ||
            simple0.equals(simple) ||
            simple0.equals(simple3)) {
            throw new RuntimeException("The method equals does not work correctly.");
        }

        if (simple0.hashCode() != simple1.hashCode() ||
            simple.hashCode() == simple0.hashCode()) {
            throw new RuntimeException("The method hashCode does not work correctly.");
        }

        if (!simple0.toString().equals(simple1.toString()) ||
            simple.toString().equals(simple0.toString())) {
            throw new RuntimeException("The method toString does not work correctly.");
        }

        /* Sorry about this.  This is the equals(String) method,
           which returns String, not boolean.  */
        if (!simple0.equals("foo").equals("foo"))
            throw new RuntimeException("The method equals(String) was not forwarded.");

        ArrayList al = new ArrayList();
        al.add(simple0);

        if (!al.contains(simple0) || !al.contains(simple1)) {
            throw new RuntimeException("Cannot find correctly a proxy in an ArrayList.");
        }

        System.out.println("<<< Test whether the methods are done at server side.");

        final ObjectName name1 = new ObjectName(":class=Test");
        mbs.registerMBean(new Test(), name1);

        TestMBean test0 = MBeanServerInvocationHandler.newProxyInstance(mbs,
                                                                name1,
                                                                TestMBean.class,
                                                                false);

        if(test0.equals(test0)) {
            throw new RuntimeException("The method equals is not done remotely as expected.");
        }

        if (!test0.toString().equals("Test-toString")) {
            throw new RuntimeException("The method toString is not done remotely as expected.");
        }

        if (test0.hashCode() != 123) {
            throw new RuntimeException("The method hashCode is not done remotely as expected.");
        }

        System.out.println("<<< Test on using a null connection or a null name.");
        SimpleMBean simple2;
        try {
            simple2 = MBeanServerInvocationHandler.newProxyInstance(null,
                                                                name,
                                                                SimpleMBean.class,
                                                                false);
            throw new RuntimeException(
                  "Null connection does not cause an IllegalArgumentException.");
        } catch (IllegalArgumentException ie) {
            // as expected
        }

        try {
            simple2 = MBeanServerInvocationHandler.newProxyInstance(mbs,
                                                                null,
                                                                SimpleMBean.class,
                                                                false);
            throw new RuntimeException(
                  "Null object name does not cause an IllegalArgumentException.");
        } catch (IllegalArgumentException ie) {
            // as expected
        }
    }

    public static interface Simplest {

    }

    public static interface SimpleMBean extends Simplest {
        public String equals(String x);
    }

    private static class Simple implements SimpleMBean {
        public String equals(String x) {
            return x;
        }
    }

    public static interface TestMBean {
        public boolean equals(Object o);

        public String toString();

        public int hashCode();
    }

    private static class Test implements TestMBean {
        public boolean equals(Object o) {
            // what can do here?

            return false;
        }

        public String toString() {
            return "Test-toString";
        }

        public int hashCode() {
            return 123;
        }
    }
}