org.jgroups.demos.JmxDemo Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.demos;

import org.jgroups.annotations.MBean;
import org.jgroups.annotations.ManagedAttribute;
import org.jgroups.annotations.ManagedOperation;
import org.jgroups.jmx.JmxConfigurator;
import org.jgroups.util.Util;

import javax.management.MBeanServer;
import javax.management.Notification;
import javax.management.NotificationBroadcasterSupport;
import javax.management.NotificationListener;

/**
 * Shows how annotations can be used to expose attributes and operations
 * @author Bela Ban
 */
@MBean
public class JmxDemo extends NotificationBroadcasterSupport {
    @ManagedAttribute
    private int age;   // exposed as read-only 'age'

    @ManagedAttribute
    private static final String last_name="Ban";  // read-only (because final) 'last_name'

    @ManagedAttribute
    private static final String first_name="Bela";  // read-only (final) 'first_name'

    @ManagedAttribute(description="social security number") // read-only
    private static final long id=322649L;

    public void foo() { // must be exposed because we have @MBean on the class
        System.out.println("foo(" + number + "): age=" + age + ", name=" + first_name + " " + last_name);
    }

    @ManagedAttribute
    private int number=10; // writeable because we have the (non-annnotated) setter below !!

    @ManagedAttribute
    public void setNumber(int num) {number=num;}

    @ManagedAttribute
    public String getNumberAsString() {
        return String.valueOf(number);
    }

    @ManagedAttribute
    public static int getMyFoo() {return 22;} // exposed as 'myFoo' *not* 'getMyFoo()' !!

    @ManagedAttribute(writable=true)
    private static int my_other_number_is_here=999; // exposed as writable myOtherNumberIsHere

    @ManagedAttribute
    private int other_number=20;  // exposed as 'otherNumber' ?

    @ManagedAttribute
    public void setOtherNumber(int num) {other_number=num;}

    @ManagedAttribute
    public void foobar() {} // doesn't start with setXXX() or getXXX(), ignored

    @ManagedAttribute
    public static boolean isFlag() {return true;} // exposed as Flag, *not* 'isFlag()' !!

    @ManagedAttribute(description="my number attribute")
    private long my_number=322649L;


    @ManagedAttribute
    public void setMyNumber(long new_number) {
        my_number=new_number;
    }

    private int accountNumber=10;

    @ManagedAttribute
    public void setAccountNumber(int num) {accountNumber=num;} // exposes accountNumber as writable

    @ManagedAttribute
    public int getAccountNumber() {return accountNumber;}

    int max_age=100;

    @ManagedAttribute
    public void setMaxAge(int age) {max_age=age;}

    @ManagedAttribute
    public int getMaxAge() {return max_age;}
    


    @ManagedOperation
    public String sayName() {
        return "I'm " + first_name + " " + last_name;
    }

    public int add(int a, int b) {return a+b;} // exposed because @MBean is on the class





    public static void main(String[] args) {
        JmxDemo demo=new JmxDemo();
        demo.addNotificationListener(new NotificationListener() {

            @Override
            public void handleNotification(Notification notification, Object handback) {
                System.out.println(">> " + notification + ", handback=" + handback);
            }
        }, null, "myHandback");

        demo.startNotifications();

        MBeanServer server=Util.getMBeanServer();
        if(server != null) {
            try {
                JmxConfigurator.register(demo, server, "demo:name=DemoObject");
                while(true) {
                    Util.sleep(10000);
                }
            }
            catch(Exception e) {
                e.printStackTrace();
            }
        }
    }

    private void startNotifications() {
        new Thread() {
            @Override
            public void run() {
                int cnt=1;
                while(true) {
                    Util.sleep(1000);
                    MyNotification notif=new MyNotification("home.grown", this, cnt, "hello-" + cnt);
                    notif.setName("Bela Ban");
                    cnt++;
                    sendNotification(notif);
                }
            }
        }.start();
    }

    protected static class MyNotification extends Notification {
        protected String name;

        public MyNotification(String type, Object source, long sequenceNumber) {
            super(type, source, sequenceNumber);
        }

        public MyNotification(String type, Object source, long sequenceNumber, String message) {
            super(type, source, sequenceNumber, message);
        }

        public MyNotification(String type, Object source, long sequenceNumber, long timeStamp) {
            super(type, source, sequenceNumber, timeStamp);
        }

        public MyNotification(String type, Object source, long sequenceNumber, long timeStamp, String message) {
            super(type, source, sequenceNumber, timeStamp, message);
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        @Override
        public String toString() {
            return super.toString() + ", name=" + name;
        }
    }
}