/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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;

import java.util.EventListener;

/**
 * Interface for receiving notification events about requests coming
 * into and going out of scope of a web application.
 *
 * <p>A ServletRequest is defined as coming into scope of a web
 * application when it is about to enter the first servlet or filter
 * of the web application, and as going out of scope as it exits
 * the last servlet or the first filter in the chain.
 *
 * <p>In order to receive these notification events, the implementation
 * class must be either declared in the deployment descriptor of the web
 * application, annotated with {@link javax.servlet.annotation.WebListener}, 
 * or registered via one of the addListener methods defined on
 * {@link ServletContext}.
 *
 * <p>Implementations of this interface are invoked at their
 * {@link #requestInitialized} method in the order in which they have been
 * declared, and at their {@link #requestDestroyed} method in reverse
 * order.
 *
 * @since Servlet 2.4
 */

public interface ServletRequestListener extends EventListener {

    /**
     * Receives notification that a ServletRequest is about to go out
     * of scope of the web application.
     *
     * @param sre the ServletRequestEvent containing the ServletRequest
     * and the ServletContext representing the web application
     */
    public void requestDestroyed(ServletRequestEvent sre);

    /**
     * Receives notification that a ServletRequest is about to come
     * into scope of the web application.
     *
     * @param sre the ServletRequestEvent containing the ServletRequest
     * and the ServletContext representing the web application
     */
    public void requestInitialized(ServletRequestEvent sre);
}