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;
}
}
}