BaseModelMBean.java 文件源码

/**
 * Send an <code>AttributeChangeNotification</code> to all registered
 * listeners.
 *
 * @param oldValue The original value of the <code>Attribute</code>
 * @param newValue The new value of the <code>Attribute</code>
 *
 * @exception MBeanException if an object initializer throws an
 *  exception
 * @exception RuntimeOperationsException wraps IllegalArgumentException
 *  when the specified notification is <code>null</code> or invalid
 */
@Override
public void sendAttributeChangeNotification
    (Attribute oldValue, Attribute newValue)
    throws MBeanException, RuntimeOperationsException {

    // Calculate the class name for the change notification
    String type = null;
    if (newValue.getValue() != null)
        type = newValue.getValue().getClass().getName();
    else if (oldValue.getValue() != null)
        type = oldValue.getValue().getClass().getName();
    else
        return;  // Old and new are both null == no change

    AttributeChangeNotification notification =
        new AttributeChangeNotification
        (this, 1, System.currentTimeMillis(),
         "Attribute value has changed",
         oldValue.getName(), type,
         oldValue.getValue(), newValue.getValue());
    sendAttributeChangeNotification(notification);

}