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ServletRequestListener.java
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ServletRequestListener.java
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/*
* Copyright (c) 1997, 2020 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 jakarta.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 jakarta.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
*
* @implSpec The default implementation takes no action.
*/
default 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
*
* @implSpec The default implementation takes no action.
*/
default void requestInitialized(ServletRequestEvent sre) {
}
}