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Java™ Platform
Standard Ed. 7

DRAFT ea-b118

javax.management
Class MBeanServerNotification

java.lang.Object
  extended by java.util.EventObject
      extended by javax.management.Notification
          extended by javax.management.MBeanServerNotification
All Implemented Interfaces:
Serializable

public class MBeanServerNotification
extends Notification

Represents a notification emitted by the MBean Server through the MBeanServerDelegate MBean. The MBean Server emits the following types of notifications: MBean registration, MBean unregistration.

To receive MBeanServerNotifications, you need to register a listener with the MBeanServerDelegate MBean that represents the MBeanServer. The ObjectName of the MBeanServerDelegate is MBeanServerDelegate.DELEGATE_NAME, which is JMImplementation:type=MBeanServerDelegate.

The following code prints a message every time an MBean is registered or unregistered in the MBean Server mbeanServer:

 private static final NotificationListener printListener = new NotificationListener() {
     public void handleNotification(Notification n, Object handback) {
         if (!(n instanceof MBeanServerNotification)) {
             System.out.println("Ignored notification of class " + n.getClass().getName());
             return;
         }
         MBeanServerNotification mbsn = (MBeanServerNotification) n;
         String what;
         if (n.getType().equals(MBeanServerNotification.REGISTRATION_NOTIFICATION))
             what = "MBean registered";
         else if (n.getType().equals(MBeanServerNotification.UNREGISTRATION_NOTIFICATION))
             what = "MBean unregistered";
         else
             what = "Unknown type " + n.getType();
         System.out.println("Received MBean Server notification: " + what + ": " +
                 mbsn.getMBeanName());
     }
 };

 ...
     mbeanServer.addNotificationListener(
             MBeanServerDelegate.DELEGATE_NAME, printListener, null, null);
 

An MBean which is not an MBeanServerDelegate may also emit MBeanServerNotifications. In particular, there is a convention for MBeans to emit an MBeanServerNotification for a group of MBeans.

An MBeanServerNotification emitted to denote the registration or unregistration of a group of MBeans has the following characteristics:

MBeans which emit these group registration/unregistration notifications will declare them in their MBeanNotificationInfo.

Since:
1.5
See Also:
Serialized Form

Field Summary
Modifier and Type Field and Description
static String REGISTRATION_NOTIFICATION
          Notification type denoting that an MBean has been registered.
static String UNREGISTRATION_NOTIFICATION
          Notification type denoting that an MBean has been unregistered.
 
Fields inherited from class javax.management.Notification
source
 
Constructor Summary
Constructor and Description
MBeanServerNotification(String type, Object source, long sequenceNumber, ObjectName objectName)
          Creates an MBeanServerNotification object specifying object names of the MBeans that caused the notification and the specified notification type.
 
Method Summary
Modifier and Type Method and Description
 ObjectName getMBeanName()
          Returns the object name of the MBean that caused the notification.
 String toString()
          Returns a String representation of this notification.
 
Methods inherited from class javax.management.Notification
getMessage, getSequenceNumber, getTimeStamp, getType, getUserData, setSequenceNumber, setSource, setTimeStamp, setUserData
 
Methods inherited from class java.util.EventObject
getSource
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

REGISTRATION_NOTIFICATION

public static final String REGISTRATION_NOTIFICATION
Notification type denoting that an MBean has been registered. Value is "JMX.mbean.registered".

See Also:
Constant Field Values

UNREGISTRATION_NOTIFICATION

public static final String UNREGISTRATION_NOTIFICATION
Notification type denoting that an MBean has been unregistered. Value is "JMX.mbean.unregistered".

See Also:
Constant Field Values
Constructor Detail

MBeanServerNotification

public MBeanServerNotification(String type,
                               Object source,
                               long sequenceNumber,
                               ObjectName objectName)
Creates an MBeanServerNotification object specifying object names of the MBeans that caused the notification and the specified notification type.

Parameters:
type - A string denoting the type of the notification. Set it to one these values: REGISTRATION_NOTIFICATION, UNREGISTRATION_NOTIFICATION.
source - The MBeanServerNotification object responsible for forwarding MBean server notification.
sequenceNumber - A sequence number that can be used to order received notifications.
objectName - The object name of the MBean that caused the notification.
Method Detail

getMBeanName

public ObjectName getMBeanName()
Returns the object name of the MBean that caused the notification.

Returns:
the object name of the MBean that caused the notification.

toString

public String toString()
Description copied from class: Notification
Returns a String representation of this notification.

Overrides:
toString in class Notification
Returns:
A String representation of this notification.

Java™ Platform
Standard Ed. 7

DRAFT ea-b118

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright © 1993, 2010, Oracle Corporation. All rights reserved.
DRAFT ea-b118

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