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}