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147 lines
4.1 KiB
147 lines
4.1 KiB
/*
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* Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*/
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package javax.management;
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/**
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* Provides definitions of the attribute change notifications sent by MBeans.
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* <P>
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* It's up to the MBean owning the attribute of interest to create and send
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* attribute change notifications when the attribute change occurs.
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* So the <CODE>NotificationBroadcaster</CODE> interface has to be implemented
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* by any MBean for which an attribute change is of interest.
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* <P>
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* Example:
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* If an MBean called <CODE>myMbean</CODE> needs to notify registered listeners
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* when its attribute:
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* <BLOCKQUOTE><CODE>
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* String myString
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* </CODE></BLOCKQUOTE>
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* is modified, <CODE>myMbean</CODE> creates and emits the following notification:
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* <BLOCKQUOTE><CODE>
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* new AttributeChangeNotification(myMbean, sequenceNumber, timeStamp, msg,
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* "myString", "String", oldValue, newValue);
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* </CODE></BLOCKQUOTE>
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*
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* @since 1.5
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*/
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public class AttributeChangeNotification extends javax.management.Notification {
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/* Serial version */
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private static final long serialVersionUID = 535176054565814134L;
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/**
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* Notification type which indicates that the observed MBean attribute value has changed.
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* <BR>The value of this type string is <CODE>jmx.attribute.change</CODE>.
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*/
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public static final String ATTRIBUTE_CHANGE = "jmx.attribute.change";
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/**
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* @serial The MBean attribute name.
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*/
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private String attributeName = null;
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/**
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* @serial The MBean attribute type.
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*/
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private String attributeType = null;
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/**
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* @serial The MBean attribute old value.
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*/
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private Object oldValue = null;
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/**
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* @serial The MBean attribute new value.
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*/
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private Object newValue = null;
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/**
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* Constructs an attribute change notification object.
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* In addition to the information common to all notification, the caller must supply the name and type
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* of the attribute, as well as its old and new values.
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*
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* @param source The notification producer, that is, the MBean the attribute belongs to.
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* @param sequenceNumber The notification sequence number within the source object.
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* @param timeStamp The date at which the notification is being sent.
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* @param msg A String containing the message of the notification.
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* @param attributeName A String giving the name of the attribute.
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* @param attributeType A String containing the type of the attribute.
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* @param oldValue An object representing value of the attribute before the change.
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* @param newValue An object representing value of the attribute after the change.
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*/
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public AttributeChangeNotification(Object source, long sequenceNumber, long timeStamp, String msg,
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String attributeName, String attributeType, Object oldValue, Object newValue) {
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super(AttributeChangeNotification.ATTRIBUTE_CHANGE, source, sequenceNumber, timeStamp, msg);
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this.attributeName = attributeName;
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this.attributeType = attributeType;
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this.oldValue = oldValue;
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this.newValue = newValue;
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}
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/**
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* Gets the name of the attribute which has changed.
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*
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* @return A String containing the name of the attribute.
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*/
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public String getAttributeName() {
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return attributeName;
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}
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/**
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* Gets the type of the attribute which has changed.
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*
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* @return A String containing the type of the attribute.
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*/
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public String getAttributeType() {
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return attributeType;
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}
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/**
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* Gets the old value of the attribute which has changed.
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*
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* @return An Object containing the old value of the attribute.
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*/
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public Object getOldValue() {
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return oldValue;
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}
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/**
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* Gets the new value of the attribute which has changed.
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*
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* @return An Object containing the new value of the attribute.
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*/
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public Object getNewValue() {
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return newValue;
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}
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}
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