001/*
002 * Copyright 2002-2015 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.context.request;
018
019import java.io.Serializable;
020
021import javax.servlet.http.HttpSessionBindingEvent;
022import javax.servlet.http.HttpSessionBindingListener;
023
024/**
025 * Adapter that implements the Servlet HttpSessionBindingListener interface,
026 * wrapping a session destruction callback.
027 *
028 * @author Juergen Hoeller
029 * @since 3.0
030 * @see RequestAttributes#registerDestructionCallback
031 * @see ServletRequestAttributes#registerSessionDestructionCallback
032 */
033@SuppressWarnings("serial")
034public class DestructionCallbackBindingListener implements HttpSessionBindingListener, Serializable {
035
036        private final Runnable destructionCallback;
037
038
039        /**
040         * Create a new DestructionCallbackBindingListener for the given callback.
041         * @param destructionCallback the Runnable to execute when this listener
042         * object gets unbound from the session
043         */
044        public DestructionCallbackBindingListener(Runnable destructionCallback) {
045                this.destructionCallback = destructionCallback;
046        }
047
048
049        @Override
050        public void valueBound(HttpSessionBindingEvent event) {
051        }
052
053        @Override
054        public void valueUnbound(HttpSessionBindingEvent event) {
055                this.destructionCallback.run();
056        }
057
058}