javax.servlet.ServletContextAttributeListener Maven / Gradle / Ivy
Show all versions of javaee-web-api Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2017 Oracle and/or its affiliates. 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_1_1.html
* or packager/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 packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [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 ServletContext
* attribute changes.
*
* 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}.
*
*
The order in which implementations of this interface are invoked is
* unspecified.
*
* @see ServletContextAttributeEvent
*
* @since Servlet 2.3
*/
public interface ServletContextAttributeListener extends EventListener {
/**
* Receives notification that an attribute has been added to the
* ServletContext.
*
* @param event the ServletContextAttributeEvent containing the
* ServletContext to which the attribute was added, along with the
* attribute name and value
*
* @implSpec
* The default implementation takes no action.
*/
default public void attributeAdded(ServletContextAttributeEvent event) {}
/**
* Receives notification that an attribute has been removed
* from the ServletContext.
*
* @param event the ServletContextAttributeEvent containing the
* ServletContext from which the attribute was removed, along with
* the attribute name and value
*
* @implSpec
* The default implementation takes no action.
*/
default public void attributeRemoved(ServletContextAttributeEvent event) {}
/*
* Receives notification that an attribute has been replaced
* in the ServletContext.
*
* @param event the ServletContextAttributeEvent containing the
* ServletContext in which the attribute was replaced, along with
* the attribute name and its old value
*
* @implSpec
* The default implementation takes no action.
*/
default public void attributeReplaced(ServletContextAttributeEvent event) {}
}