Java example source code file (NonComparableAttributeValueTest.java)

This example Java source code file (NonComparableAttributeValueTest.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

add, bye, countermonitor, create, exception, gaugemonitor, granularityperiod, integerattribute, management, mbean, mbeanserver, objectname, observedobject, set, stringmonitor

The NonComparableAttributeValueTest.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 6273541
 * @summary Test that the counter/gauge/string monitors emit a
 *          jmx.monitor.error.type notification when the attribute
 *          being monitored returns a non comparable value.
 * @author Luis-Miguel Alventosa
 * @run clean NonComparableAttributeValueTest
 * @run build NonComparableAttributeValueTest
 * @run main NonComparableAttributeValueTest
 */

import javax.management.*;
import javax.management.monitor.*;

public class NonComparableAttributeValueTest implements NotificationListener {

    // Flag to notify that a message has been received
    private boolean messageReceived = false;

    // MBean class
    public class ObservedObject implements ObservedObjectMBean {
        public Object getIntegerAttribute() {
            return new Object();
        }
        public Object getStringAttribute() {
            return new Object();
        }
    }

    // MBean interface
    public interface ObservedObjectMBean {
        public Object getIntegerAttribute();
        public Object getStringAttribute();
    }

    // Notification handler
    public void handleNotification(Notification notification,
                                   Object handback) {
        MonitorNotification n = (MonitorNotification) notification;
        echo("\tInside handleNotification...");
        String type = n.getType();
        try {
            if (type.equals(
                    MonitorNotification.OBSERVED_ATTRIBUTE_TYPE_ERROR)) {
                echo("\t\t" + n.getObservedAttribute() + " is null");
                echo("\t\tDerived Gauge = " + n.getDerivedGauge());
                echo("\t\tTrigger = " + n.getTrigger());
                messageReceived = true;
            } else {
                echo("\t\tSkipping notification of type: " + type);
            }
        } catch (Exception e) {
            echo("\tError in handleNotification!");
            e.printStackTrace(System.out);
        }
    }

    /**
     * Update the counter and check for notifications
     */
    public int counterMonitorNotification() throws Exception {

        CounterMonitor counterMonitor = null;
        try {
            MBeanServer server = MBeanServerFactory.newMBeanServer();

            String domain = server.getDefaultDomain();

            // Create a new CounterMonitor MBean and add it to the MBeanServer.
            //
            echo(">>> CREATE a new CounterMonitor MBean");
            ObjectName counterMonitorName = new ObjectName(
                            domain + ":type=" + CounterMonitor.class.getName());
            counterMonitor = new CounterMonitor();
            server.registerMBean(counterMonitor, counterMonitorName);

            echo(">>> ADD a listener to the CounterMonitor");
            counterMonitor.addNotificationListener(this, null, null);

            //
            // MANAGEMENT OF A STANDARD MBEAN
            //

            echo(">>> CREATE a new ObservedObject MBean");

            ObjectName obsObjName =
                ObjectName.getInstance(domain + ":type=ObservedObject");
            ObservedObject obsObj = new ObservedObject();
            server.registerMBean(obsObj, obsObjName);

            echo(">>> SET the attributes of the CounterMonitor:");

            counterMonitor.addObservedObject(obsObjName);
            echo("\tATTRIBUTE \"ObservedObject\"    = " + obsObjName);

            counterMonitor.setObservedAttribute("IntegerAttribute");
            echo("\tATTRIBUTE \"ObservedAttribute\" = IntegerAttribute");

            counterMonitor.setNotify(true);
            echo("\tATTRIBUTE \"NotifyFlag\"        = true");

            Integer threshold = 2;
            counterMonitor.setInitThreshold(threshold);
            echo("\tATTRIBUTE \"Threshold\"         = " + threshold);

            int granularityperiod = 500;
            counterMonitor.setGranularityPeriod(granularityperiod);
            echo("\tATTRIBUTE \"GranularityPeriod\" = " + granularityperiod);

            echo(">>> START the CounterMonitor");
            counterMonitor.start();

            // Wait for granularity period (multiplied by 2 for sure)
            //
            Thread.sleep(granularityperiod * 2);

            // Check if notification was received
            //
            if (messageReceived) {
                echo("\tOK: CounterMonitor notification received");
            } else {
                echo("\tKO: CounterMonitor notification missed or not emitted");
                return 1;
            }
        } finally {
            if (counterMonitor != null)
                counterMonitor.stop();
        }

        return 0;
    }

    /**
     * Update the gauge and check for notifications
     */
    public int gaugeMonitorNotification() throws Exception {

        GaugeMonitor gaugeMonitor = null;
        try {
            MBeanServer server = MBeanServerFactory.newMBeanServer();

            String domain = server.getDefaultDomain();

            // Create a new GaugeMonitor MBean and add it to the MBeanServer.
            //
            echo(">>> CREATE a new GaugeMonitor MBean");
            ObjectName gaugeMonitorName = new ObjectName(
                            domain + ":type=" + GaugeMonitor.class.getName());
            gaugeMonitor = new GaugeMonitor();
            server.registerMBean(gaugeMonitor, gaugeMonitorName);

            echo(">>> ADD a listener to the GaugeMonitor");
            gaugeMonitor.addNotificationListener(this, null, null);

            //
            // MANAGEMENT OF A STANDARD MBEAN
            //

            echo(">>> CREATE a new ObservedObject MBean");

            ObjectName obsObjName =
                ObjectName.getInstance(domain + ":type=ObservedObject");
            ObservedObject obsObj = new ObservedObject();
            server.registerMBean(obsObj, obsObjName);

            echo(">>> SET the attributes of the GaugeMonitor:");

            gaugeMonitor.addObservedObject(obsObjName);
            echo("\tATTRIBUTE \"ObservedObject\"    = " + obsObjName);

            gaugeMonitor.setObservedAttribute("IntegerAttribute");
            echo("\tATTRIBUTE \"ObservedAttribute\" = IntegerAttribute");

            gaugeMonitor.setNotifyLow(false);
            gaugeMonitor.setNotifyHigh(true);
            echo("\tATTRIBUTE \"Notify Low  Flag\"  = false");
            echo("\tATTRIBUTE \"Notify High Flag\"  = true");

            Double highThreshold = 3.0, lowThreshold = 2.5;
            gaugeMonitor.setThresholds(highThreshold, lowThreshold);
            echo("\tATTRIBUTE \"Low  Threshold\"    = " + lowThreshold);
            echo("\tATTRIBUTE \"High Threshold\"    = " + highThreshold);

            int granularityperiod = 500;
            gaugeMonitor.setGranularityPeriod(granularityperiod);
            echo("\tATTRIBUTE \"GranularityPeriod\" = " + granularityperiod);

            echo(">>> START the GaugeMonitor");
            gaugeMonitor.start();

            // Wait for granularity period (multiplied by 2 for sure)
            //
            Thread.sleep(granularityperiod * 2);

            // Check if notification was received
            //
            if (messageReceived) {
                echo("\tOK: GaugeMonitor notification received");
            } else {
                echo("\tKO: GaugeMonitor notification missed or not emitted");
                return 1;
            }
        } finally {
            if (gaugeMonitor != null)
                gaugeMonitor.stop();
        }

        return 0;
    }

    /**
     * Update the string and check for notifications
     */
    public int stringMonitorNotification() throws Exception {

        StringMonitor stringMonitor = null;
        try {
            MBeanServer server = MBeanServerFactory.newMBeanServer();

            String domain = server.getDefaultDomain();

            // Create a new StringMonitor MBean and add it to the MBeanServer.
            //
            echo(">>> CREATE a new StringMonitor MBean");
            ObjectName stringMonitorName = new ObjectName(
                            domain + ":type=" + StringMonitor.class.getName());
            stringMonitor = new StringMonitor();
            server.registerMBean(stringMonitor, stringMonitorName);

            echo(">>> ADD a listener to the StringMonitor");
            stringMonitor.addNotificationListener(this, null, null);

            //
            // MANAGEMENT OF A STANDARD MBEAN
            //

            echo(">>> CREATE a new ObservedObject MBean");

            ObjectName obsObjName =
                ObjectName.getInstance(domain + ":type=ObservedObject");
            ObservedObject obsObj = new ObservedObject();
            server.registerMBean(obsObj, obsObjName);

            echo(">>> SET the attributes of the StringMonitor:");

            stringMonitor.addObservedObject(obsObjName);
            echo("\tATTRIBUTE \"ObservedObject\"    = " + obsObjName);

            stringMonitor.setObservedAttribute("StringAttribute");
            echo("\tATTRIBUTE \"ObservedAttribute\" = StringAttribute");

            stringMonitor.setNotifyMatch(true);
            echo("\tATTRIBUTE \"NotifyMatch\"       = true");

            stringMonitor.setNotifyDiffer(false);
            echo("\tATTRIBUTE \"NotifyDiffer\"      = false");

            stringMonitor.setStringToCompare("do_match_now");
            echo("\tATTRIBUTE \"StringToCompare\"   = \"do_match_now\"");

            int granularityperiod = 500;
            stringMonitor.setGranularityPeriod(granularityperiod);
            echo("\tATTRIBUTE \"GranularityPeriod\" = " + granularityperiod);

            echo(">>> START the StringMonitor");
            stringMonitor.start();

            // Wait for granularity period (multiplied by 2 for sure)
            //
            Thread.sleep(granularityperiod * 2);

            // Check if notification was received
            //
            if (messageReceived) {
                echo("\tOK: StringMonitor notification received");
            } else {
                echo("\tKO: StringMonitor notification missed or not emitted");
                return 1;
            }
        } finally {
            if (stringMonitor != null)
                stringMonitor.stop();
        }

        return 0;
    }

    /**
     * Test the monitor notifications.
     */
    public int monitorNotifications() throws Exception {
        echo(">>> ----------------------------------------");
        messageReceived = false;
        int error = counterMonitorNotification();
        echo(">>> ----------------------------------------");
        messageReceived = false;
        error += gaugeMonitorNotification();
        echo(">>> ----------------------------------------");
        messageReceived = false;
        error += stringMonitorNotification();
        echo(">>> ----------------------------------------");
        return error;
    }

    /*
     * Print message
     */
    private static void echo(String message) {
        System.out.println(message);
    }

    /*
     * Standalone entry point.
     *
     * Run the test and report to stdout.
     */
    public static void main (String args[]) throws Exception {
        NonComparableAttributeValueTest test = new NonComparableAttributeValueTest();
        int error = test.monitorNotifications();
        if (error > 0) {
            echo(">>> Unhappy Bye, Bye!");
            throw new IllegalStateException("Test FAILED: Didn't get all " +
                                            "the notifications that were " +
                                            "expected by the test!");
        } else {
            echo(">>> Happy Bye, Bye!");
        }
    }
}