/*
 * Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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.http;

import java.util.EventListener;

Objects that are bound to a session may listen to container
events notifying them that sessions will be passivated and that
session will be activated. A container that migrates session
between VMs or persists sessions is required to notify all
attributes bound to sessions implementing
HttpSessionActivationListener.
Since:
Servlet 2.3/** Objects that are bound to a session may listen to container
 * events notifying them that sessions will be passivated and that
 * session will be activated. A container that migrates session
 * between VMs or persists sessions is required to notify all
 * attributes bound to sessions implementing
 * HttpSessionActivationListener.
 *
 * @since Servlet 2.3
 */

public interface HttpSessionActivationListener extends EventListener { 

    
Notification that the session is about to be passivated.
Params:
se – the HttpSessionEvent indicating the passivation of the session
Implementation Requirements:

The default implementation takes no action./**
     * Notification that the session is about to be passivated.
     *
     * @implSpec
     * The default implementation takes no action.
     * 
     * @param se the {@link HttpSessionEvent} indicating the passivation
     * of the session
     */
    default public void sessionWillPassivate(HttpSessionEvent se) {}

    
Notification that the session has just been activated.
Params:
se – the HttpSessionEvent indicating the activation of the session
Implementation Requirements:

The default implementation takes no action./**
     * Notification that the session has just been activated.
     *
     * @implSpec
     * The default implementation takes no action.
     * 
     * @param se the {@link HttpSessionEvent} indicating the activation
     * of the session
     */
    default public void sessionDidActivate(HttpSessionEvent se) {}
}