javax.management

## Class AttributeChangeNotification

- java.lang.Object
- - java.util.EventObject
  - - javax.management.Notification
    - - javax.management.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 Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static 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

    Constructors
    Constructor and Description
    `AttributeChangeNotification(Object source, long sequenceNumber, long timeStamp, String msg, String attributeName, String attributeType, Object oldValue, Object newValue)` Constructs an attribute change notification object.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getAttributeName()` Gets the name of the attribute which has changed.
    `String` | `getAttributeType()` Gets the type of the attribute which has changed.
    `Object` | `getNewValue()` Gets the new value of the attribute which has changed.
    `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, toString`

    - ### 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

    - #### 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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