/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet;

import java.util.EventListener;

A ServletRequestAttributeListener can be implemented by the
developer interested in being notified of request attribute
changes. Notifications will be generated while the request
is within the scope of the web application in which the listener
is registered. A request is defined as coming into scope when
it is about to enter the first servlet or filter in each web
application, as going out of scope when it exits the last servlet
or the first filter in the chain.
Since:
Servlet 2.4/**
 * A ServletRequestAttributeListener can be implemented by the
 * developer interested in being notified of request attribute
 * changes. Notifications will be generated while the request
 * is within the scope of the web application in which the listener
 * is registered. A request is defined as coming into scope when
 * it is about to enter the first servlet or filter in each web
 * application, as going out of scope when it exits the last servlet
 * or the first filter in the chain.
 *
 * @since Servlet 2.4
 */
public interface ServletRequestAttributeListener extends EventListener {
    
Notification that a new attribute was added to the
servlet request. Called after the attribute is added.
The default implementation is a NO-OP.
Params:
srae – Information about the new request attribute/**
     * Notification that a new attribute was added to the
     * servlet request. Called after the attribute is added.
     * The default implementation is a NO-OP.
     * @param srae Information about the new request attribute
     */
    public default void attributeAdded(ServletRequestAttributeEvent srae) {
    }

    
Notification that an existing attribute has been removed from the
servlet request. Called after the attribute is removed.
The default implementation is a NO-OP.
Params:
srae – Information about the removed request attribute/**
     * Notification that an existing attribute has been removed from the
     * servlet request. Called after the attribute is removed.
     * The default implementation is a NO-OP.
     * @param srae Information about the removed request attribute
     */
    public default void attributeRemoved(ServletRequestAttributeEvent srae) {
    }

    
Notification that an attribute was replaced on the
servlet request. Called after the attribute is replaced.
The default implementation is a NO-OP.
Params:
srae – Information about the replaced request attribute/**
     * Notification that an attribute was replaced on the
     * servlet request. Called after the attribute is replaced.
     * The default implementation is a NO-OP.
     * @param srae Information about the replaced request attribute
     */
    public default void attributeReplaced(ServletRequestAttributeEvent srae) {
    }
}