javax.management
Class AttributeChangeNotification

java.lang.Object
  java.util.EventObject
      javax.management.Notification
          javax.management.AttributeChangeNotification

All Implemented Interfaces:

java.io.Serializable

public class AttributeChangeNotification

extends Notification

Provides definitions of the attribute change notifications sent by MBeans.

It's up to the MBean owning the attribute of interest to create and send attribute change notifications when the attribute change occurs. So the NotificationBroadcaster interface has to be implemented by any MBean for which an attribute change is of interest.

Example: If an MBean called myMbean needs to notify registered listeners when its attribute:

String myString

is modified, myMbean creates and emits the following notification:

new AttributeChangeNotification(myMbean, sequenceNumber, timeStamp, msg, "myString", "String", oldValue, newValue);

See Also:

Serialized Form

Field Summary

static java.lang.String

ATTRIBUTE_CHANGE Notification type which indicates that the observed MBean attribute value has changed.

Fields inherited from class javax.management.Notification

source

Constructor Summary

AttributeChangeNotification(java.lang.Object source, long sequenceNumber, long timeStamp, java.lang.String msg, java.lang.String attributeName, java.lang.String attributeType, java.lang.Object oldValue, java.lang.Object newValue)
Constructs an attribute change notification object.

Method Summary

java.lang.String	getAttributeName() Gets the name of the attribute which has changed.
java.lang.String	getAttributeType() Gets the type of the attribute which has changed.
java.lang.Object	getNewValue() Gets the new value of the attribute which has changed.
java.lang.Object	getOldValue() Gets the old value of the attribute which has changed.

Methods inherited from class javax.management.Notification

getMessage, getSequenceNumber, getTimeStamp, getType, getUserData, setSequenceNumber, setSource, setTimeStamp, setUserData

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ATTRIBUTE_CHANGE

public static final java.lang.String ATTRIBUTE_CHANGE

Notification type which indicates that the observed MBean attribute value has changed.
The value of this type string is jmx.attribute.change.

Constructor Detail

AttributeChangeNotification

public AttributeChangeNotification(java.lang.Object source,
                                   long sequenceNumber,
                                   long timeStamp,
                                   java.lang.String msg,
                                   java.lang.String attributeName,
                                   java.lang.String attributeType,
                                   java.lang.Object oldValue,
                                   java.lang.Object newValue)

Constructs an attribute change notification object. In addition to the information common to all notification, the caller must supply the name and type of the attribute, as well as its old and new values.

Parameters:

source - The notification producer, that is, the MBean the attribute belongs to.

sequenceNumber - The notification sequence number within the source object.

timeStamp - The date at which the notification is being sent.

msg - A String containing the message of the notification.

attributeName - A String giving the name of the attribute.

attributeType - A String containing the type of the attribute.

oldValue - An object representing value of the attribute before the change.

newValue - An object representing value of the attribute after the change.

Method Detail

getAttributeName

public java.lang.String getAttributeName()

Gets the name of the attribute which has changed.

Returns:

A String containing the name of the attribute.

getAttributeType

public java.lang.String getAttributeType()

Gets the type of the attribute which has changed.

Returns:

A String containing the type of the attribute.

getOldValue

public java.lang.Object getOldValue()

Gets the old value of the attribute which has changed.

Returns:

An Object containing the old value of the attribute.

getNewValue

public java.lang.Object getNewValue()

Gets the new value of the attribute which has changed.

Returns:

An Object containing the new value of the attribute.