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Java example source code file (FeatureOrderTest.java)

This example Java source code file (FeatureOrderTest.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, biginteger, exception, list, management, math, mbeanattributeinfo, mbeanoperationinfo, method, objectname, orderimpl, ordermbean, ordermxbean, reflection, standardmbean, string, test, util

The FeatureOrderTest.java Java example source code

/*
 * Copyright (c) 2006, 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 6486655
 * @summary Test that attributes and operations appear in the same order
 * in MBeanInfo as they did in the Standard MBean or MXBean Interface.
 * @author Eamonn McManus
 */

/*
 * For more background on this test, see:
 * http://weblogs.java.net/blog/emcmanus/archive/2006/11/notes_on_unspec.html
 */

import java.lang.management.ManagementFactory;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.StandardMBean;

public class FeatureOrderTest {
    private static boolean failed;

    public static interface OrderMXBean {
        public int getMercury();

        public String getVenus();
        public void setVenus(String x);

        public BigInteger getEarth();
        public void setEarth(BigInteger x);

        public boolean isMars();

        public double getJupiter();

        public byte getSaturn();

        public short getUranus();
        public void setUranus(short x);

        public long getNeptune();

        // No more Pluto!  Yay!

        public void neptune();
        public void uranus(int x);
        public int saturn(int x, int y);
        public short jupiter(int x, long y, double z);
        public void mars(boolean x);
        public BigInteger earth();
        public double earth(double x);  // http://www.imdb.com/title/tt0064519/
        public String venus();
        public int mercury();
    }

    public static interface OrderMBean extends OrderMXBean {}

    public static class OrderImpl implements OrderMXBean {
        public int getMercury() {
            return 0;
        }

        public String getVenus() {
            return null;
        }

        public void setVenus(String x) {
        }

        public BigInteger getEarth() {
            return null;
        }

        public void setEarth(BigInteger x) {
        }

        public boolean isMars() {
            return true;
        }

        public double getJupiter() {
            return 0;
        }

        public byte getSaturn() {
            return 0;
        }

        public short getUranus() {
            return 0;
        }

        public void setUranus(short x) {
        }

        public long getNeptune() {
            return 0;
        }

        public void neptune() {
        }

        public void uranus(int x) {
        }

        public int saturn(int x, int y) {
            return 0;
        }

        public short jupiter(int x, long y, double z) {
            return 0;
        }

        public void mars(boolean x) {
        }

        public BigInteger earth() {
            return null;
        }

        public double earth(double x) {
            return 0;
        }

        public String venus() {
            return null;
        }

        public int mercury() {
            return 0;
        }
    }

    public static class Order extends OrderImpl implements OrderMBean {}

    private static final boolean[] booleans = {false, true};

    public static void main(String[] args) throws Exception {
        // Build the lists of attributes and operations that we would expect
        // if they are derived by reflection and preserve the reflection order
        List<String> expectedAttributeNames = new ArrayList();
        List<String> expectedOperationNames = new ArrayList();
        for (Method m : OrderMXBean.class.getMethods()) {
            String name = m.getName();
            String attrName = null;
            if (name.startsWith("get") && !name.equals("get") &&
                    m.getParameterTypes().length == 0 &&
                    m.getReturnType() != void.class)
                attrName = name.substring(3);
            else if (name.startsWith("is") && !name.equals("is") &&
                    m.getParameterTypes().length == 0 &&
                    m.getReturnType() == boolean.class)
                attrName = name.substring(2);
            else if (name.startsWith("set") && !name.equals("set") &&
                    m.getReturnType() == void.class &&
                    m.getParameterTypes().length == 1)
                attrName = name.substring(3);
            if (attrName != null) {
                if (!expectedAttributeNames.contains(attrName))
                    expectedAttributeNames.add(attrName);
            } else
                expectedOperationNames.add(name);
        }

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        for (boolean mxbean : booleans) {
            for (boolean withStandardMBean : booleans) {
                String testName = "MXBean: " + mxbean + "; " +
                        "using javax.management.StandardMBean: " +
                        withStandardMBean;
                System.out.println("Test case: " + testName);
                Object mbean;
                if (mxbean) {
                    if (withStandardMBean) {
                        mbean = new StandardMBean(
                                new OrderImpl(), OrderMXBean.class, true);
                    } else
                        mbean = new OrderImpl();
                } else {
                    if (withStandardMBean)
                        mbean = new StandardMBean(new Order(), OrderMBean.class);
                    else
                        mbean = new Order();
                }
                ObjectName name = new ObjectName(
                        ":mxbean=" + mxbean + "," + "withStandardMBean=" +
                        withStandardMBean);
                mbs.registerMBean(mbean, name);

                /* Make sure we are testing what we think. */
                MBeanInfo mbi = mbs.getMBeanInfo(name);
                boolean isWithStandardMBean =
                        mbs.isInstanceOf(name, StandardMBean.class.getName());
                System.out.println("classname " +mbi.getClassName());
                String mxbeanField =
                        (String) mbi.getDescriptor().getFieldValue("mxbean");
                boolean isMXBean = "true".equalsIgnoreCase(mxbeanField);

                if (mxbean != isMXBean)
                    throw new Exception("Test error: MXBean mismatch");
                if (withStandardMBean != isWithStandardMBean)
                    throw new Exception("Test error: StandardMBean mismatch");

                // Check that order of attributes and operations matches
                MBeanAttributeInfo[] mbais = mbi.getAttributes();
                checkEqual(expectedAttributeNames.size(), mbais.length,
                        "number of attributes");
                List<String> attributeNames = new ArrayList();
                for (MBeanAttributeInfo mbai : mbais)
                    attributeNames.add(mbai.getName());
                checkEqual(expectedAttributeNames, attributeNames,
                        "order of attributes");

                MBeanOperationInfo[] mbois = mbi.getOperations();
                checkEqual(expectedOperationNames.size(), mbois.length,
                        "number of operations");
                List<String> operationNames = new ArrayList();
                for (MBeanOperationInfo mboi : mbois)
                    operationNames.add(mboi.getName());
                checkEqual(expectedOperationNames, operationNames,
                        "order of operations");
                System.out.println();
            }
        }

        if (failed)
            throw new Exception("TEST FAILED");
        System.out.println("TEST PASSED");
    }

    private static void checkEqual(Object expected, Object actual, String what) {
        if (expected.equals(actual))
            System.out.println("OK: " + what + " matches");
        else {
            System.out.println("FAILED: " + what + " differs:");
            System.out.println("  expected: " + expected);
            System.out.println("  actual:   " + actual);
            failed = true;
        }
    }
}

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