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/*
 * 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.http;

import java.util.EventListener;

/**
 * This listener interface can be implemented in order to
 * get notifications of changes to the attribute lists of sessions within
 * this web application.
 *
 * @version $Rev: 788194 $ $Date: 2009-06-24 18:05:48 -0400 (Wed, 24 Jun 2009) $
 * @since v 2.3
 */

public interface HttpSessionAttributeListener extends EventListener {
    /**
     * Notification that an attribute has been added to a session. Called after the attribute is added.
     */
    void attributeAdded(HttpSessionBindingEvent se);

    /**
     * Notification that an attribute has been removed from a session. Called after the attribute is removed.
     */
    void attributeRemoved(HttpSessionBindingEvent se);

    /**
     * Notification that an attribute has been replaced in a session. Called after the attribute is replaced.
     */
    void attributeReplaced(HttpSessionBindingEvent se);

}