javax.servlet.ServletRequestAttributeListener Maven / Gradle / Ivy
/*
* Copyright (c) 1997-2018 Oracle and/or its affiliates and others.
* 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;
import java.util.EventListener;
/**
* Interface for receiving notification events about ServletRequest attribute changes.
*
*
* Notifications will be generated while the request is within the scope of the web application. 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 when it exits the last servlet or the first filter in the chain.
*
*
* 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.
*
* @since Servlet 2.4
*/
public interface ServletRequestAttributeListener extends EventListener {
/**
* Receives notification that an attribute has been added to the ServletRequest.
*
* @param srae the ServletRequestAttributeEvent containing the ServletRequest and the name and value of the
* attribute that was added
*
* @implSpec The default implementation takes no action.
*/
default public void attributeAdded(ServletRequestAttributeEvent srae) {
}
/**
* Receives notification that an attribute has been removed from the ServletRequest.
*
* @param srae the ServletRequestAttributeEvent containing the ServletRequest and the name and value of the
* attribute that was removed
*
* @implSpec The default implementation takes no action.
*/
default public void attributeRemoved(ServletRequestAttributeEvent srae) {
}
/**
* Receives notification that an attribute has been replaced on the ServletRequest.
*
* @param srae the ServletRequestAttributeEvent containing the ServletRequest and the name and (old) value of the
* attribute that was replaced
*
* @implSpec The default implementation takes no action.
*/
default public void attributeReplaced(ServletRequestAttributeEvent srae) {
}
}