001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.metrics.aspects.session;
018
019import javax.servlet.annotation.WebListener;
020import javax.servlet.http.HttpSessionEvent;
021import javax.servlet.http.HttpSessionListener;
022
023
024/**
025 * Listener that counts the current active sessions
026 * 
027 * @author Tobias Soloschenko
028 *
029 */
030@WebListener
031public class SessionCountListener implements HttpSessionListener
032{
033
034        @Override
035        public void sessionDestroyed(HttpSessionEvent event)
036        {
037                dec(event);
038        }
039
040        @Override
041        public void sessionCreated(HttpSessionEvent event)
042        {
043                inc(event);
044        }
045
046        /**
047         * Used to wire an aspect around
048         * 
049         * @param event the http session event
050         */
051        public void dec(HttpSessionEvent event)
052        {
053                // NOOP for aspect usage
054        }
055        
056        /**
057         * Used to wire an aspect around
058         * 
059         * @param event the http session event
060         */
061        public void inc(HttpSessionEvent event)
062        {
063                // NOOP for aspect usage
064        }
065}