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package javax.management;




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
/**
 * Provides definitions of the attribute change notifications sent by MBeans.
 * <P>
 * 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 <CODE>NotificationBroadcaster</CODE> interface has to be implemented
 * by any MBean for which an attribute change is of interest.
 * <P>
 * Example:
 * If an MBean called <CODE>myMbean</CODE> needs to notify registered listeners
 * when its attribute:
 * <BLOCKQUOTE><CODE>
 *      String myString
 * </CODE></BLOCKQUOTE>
 * is modified, <CODE>myMbean</CODE> creates and emits the following notification:
 * <BLOCKQUOTE><CODE>
 * new AttributeChangeNotification(myMbean, sequenceNumber, timeStamp, msg,
 *                                 "myString", "String", oldValue, newValue);
 * </CODE></BLOCKQUOTE>
 *
 * @since 1.5
 */
public class AttributeChangeNotification extends javax.management.Notification {

    /* Serial version */
    private static final long serialVersionUID = 535176054565814134L;

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

The value of this type string is jmx.attribute.change.

/**
     * Notification type which indicates that the observed MBean attribute value has changed.
     * <BR>The value of this type string is <CODE>jmx.attribute.change</CODE>.
     */
    public static final String ATTRIBUTE_CHANGE = "jmx.attribute.change";


    
@serialThe MBean attribute name.
/**
     * @serial The MBean attribute name.
     */
    private String attributeName = null;

    
@serialThe MBean attribute type.
/**
     * @serial The MBean attribute type.
     */
    private String attributeType = null;

    
@serialThe MBean attribute old value.
/**
     * @serial The MBean attribute old value.
     */
    @SuppressWarnings("serial") // Conditionally serializable
    private Object oldValue = null;

    
@serialThe MBean attribute new value.
/**
     * @serial The MBean attribute new value.
     */
    @SuppressWarnings("serial") // Conditionally serializable
    private Object newValue = null;


    
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.

Params:
  • 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.
/**
     * 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.
     */
    public AttributeChangeNotification(Object source, long sequenceNumber, long timeStamp, String msg,
                                       String attributeName, String attributeType, Object oldValue, Object newValue) {

        super(AttributeChangeNotification.ATTRIBUTE_CHANGE, source, sequenceNumber, timeStamp, msg);
        this.attributeName = attributeName;
        this.attributeType = attributeType;
        this.oldValue = oldValue;
        this.newValue = newValue;
    }


    
Gets the name of the attribute which has changed.

Returns:A String containing the name of the attribute.
/**
     * Gets the name of the attribute which has changed.
     *
     * @return A String containing the name of the attribute.
     */
    public String getAttributeName() {
        return attributeName;
    }

    
Gets the type of the attribute which has changed.

Returns:A String containing the type of the attribute.
/**
     * Gets the type of the attribute which has changed.
     *
     * @return A String containing the type of the attribute.
     */
    public String getAttributeType() {
        return attributeType;
    }

    
Gets the old value of the attribute which has changed.

Returns:An Object containing the old value of the attribute.
/**
     * Gets the old value of the attribute which has changed.
     *
     * @return An Object containing the old value of the attribute.
     */
    public Object getOldValue() {
        return oldValue;
    }

    
Gets the new value of the attribute which has changed.

Returns:An Object containing the new value of the attribute.
/**
     * Gets the new value of the attribute which has changed.
     *
     * @return An Object containing the new value of the attribute.
     */
    public Object getNewValue() {
        return newValue;
    }

}