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AttributeChangeNotification.javaAPI DocJava SE 5 API4252Fri Aug 26 14:57:32 BST 2005javax.management

AttributeChangeNotification

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);
since
1.5

Fields Summary
private static final long
serialVersionUID
public static final 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.
private String
attributeName
private String
attributeType
private Object
oldValue
private Object
newValue
Constructors Summary
public AttributeChangeNotification(Object source, long sequenceNumber, long timeStamp, String msg, String attributeName, String attributeType, Object oldValue, 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.

param
source The notification producer, that is, the MBean the attribute belongs to.
param
sequenceNumber The notification sequence number within the source object.
param
timeStamp The date at which the notification is being sent.
param
msg A String containing the message of the notification.
param
attributeName A String giving the name of the attribute.
param
attributeType A String containing the type of the attribute.
param
oldValue An object representing value of the attribute before the change.
param
newValue An object representing value of the attribute after the change.


    
                                                                                                                                   
            
                                               
        
        super(AttributeChangeNotification.ATTRIBUTE_CHANGE, source, sequenceNumber, timeStamp, msg);
        this.attributeName = attributeName;
        this.attributeType = attributeType;
        this.oldValue = oldValue;
        this.newValue = newValue;
    
Methods Summary
public java.lang.StringgetAttributeName()
Gets the name of the attribute which has changed.

return
A String containing the name of the attribute.

 
        return attributeName;
    
public java.lang.StringgetAttributeType()
Gets the type of the attribute which has changed.

return
A String containing the type of the attribute.

 
        return attributeType;
    
public java.lang.ObjectgetNewValue()
Gets the new value of the attribute which has changed.

return
An Object containing the new value of the attribute.

 
        return newValue;
    
public java.lang.ObjectgetOldValue()
Gets the old value of the attribute which has changed.

return
An Object containing the old value of the attribute.

 
        return oldValue;