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Java Standard Edition (SE)

AttributeChangeNotification


compact3
javax.management

Class AttributeChangeNotification

  • All Implemented Interfaces:
    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);
    Since:
    1.5
    See Also:
    Serialized Form
    • Field Detail

      • ATTRIBUTE_CHANGE

        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.
        See Also:
        Constant Field Values
    • Constructor Detail

      • AttributeChangeNotification

        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.
        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 String getAttributeName()
        Gets the name of the attribute which has changed.
        Returns:
        A String containing the name of the attribute.
      • getAttributeType

        public String getAttributeType()
        Gets the type of the attribute which has changed.
        Returns:
        A String containing the type of the attribute.
      • getOldValue

        public Object getOldValue()
        Gets the old value of the attribute which has changed.
        Returns:
        An Object containing the old value of the attribute.
      • getNewValue

        public Object getNewValue()
        Gets the new value of the attribute which has changed.
        Returns:
        An Object containing the new value of the attribute.


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