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 org.apache.wicket.metrics.WicketMetrics;
020import org.aspectj.lang.ProceedingJoinPoint;
021import org.aspectj.lang.annotation.Around;
022import org.aspectj.lang.annotation.Aspect;
023
024/**
025 * The Session count listener aspect measures how many sessions are active
026 * 
027 * @author Tobias Soloschenko
028 *
029 */
030@Aspect
031public class SessionCountListenerAspect extends WicketMetrics
032{
033
034        /**
035         * Measures if a session is going to be activated
036         * 
037         * @param joinPoint
038         *            the join point
039         * @return void
040         * @throws Throwable
041         *             if an error occurred 
042         */
043        @Around("execution(* org.apache.wicket.metrics.aspects.session.SessionCountListener.inc(..))")
044        public Object aroundInc(ProceedingJoinPoint joinPoint) throws Throwable
045        {
046                Object count = joinPoint.proceed();
047                count("core/session/count", null, CounterOperation.INC, 1L);
048                return count;
049        }
050        
051        /**
052         * Measures if a session is going to be destroyed
053         * 
054         * @param joinPoint
055         *            the join point
056         * @return void
057         * @throws Throwable
058         *             if an error occurred
059         */
060        @Around("execution(* org.apache.wicket.metrics.aspects.session.SessionCountListener.dec(..))")
061        public Object aroundDec(ProceedingJoinPoint joinPoint) throws Throwable
062        {
063                Object count = joinPoint.proceed();
064                count("core/session/count", null, CounterOperation.DEC, 1L);
065                return count;
066        }
067
068}