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 */ 017 package org.apache.commons.monitoring.web.discovery; 018 019 import org.apache.commons.monitoring.gauges.Gauge; 020 021 import javax.servlet.ServletContextEvent; 022 import javax.servlet.ServletContextListener; 023 024 public class GaugeDiscoveryListener implements ServletContextListener { 025 private Gauge.LoaderHelper helper; 026 027 @Override 028 public void contextInitialized(final ServletContextEvent sce) { 029 final String prefixesStr = sce.getServletContext().getInitParameter("monitoring.discovery.packages"); 030 final String[] prefixes; 031 if (prefixesStr != null) { 032 prefixes = prefixesStr.split(","); 033 } else { 034 prefixes = new String[0]; 035 } 036 helper = new Gauge.LoaderHelper("true".equals(sce.getServletContext().getInitParameter("monitoring.discovery.exclude-parent")), prefixes); 037 } 038 039 @Override 040 public void contextDestroyed(final ServletContextEvent sce) { 041 helper.destroy(); 042 } 043 }