AttributeChangeNotification (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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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
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

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

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

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 Summary
`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
`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
`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.