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.servlet; 018 019 import org.apache.commons.monitoring.Role; 020 import org.apache.commons.monitoring.counters.Counter; 021 import org.apache.commons.monitoring.repositories.Repository; 022 import org.apache.commons.monitoring.stopwatches.StopWatch; 023 024 import javax.servlet.Filter; 025 import javax.servlet.FilterChain; 026 import javax.servlet.FilterConfig; 027 import javax.servlet.ServletException; 028 import javax.servlet.ServletRequest; 029 import javax.servlet.ServletResponse; 030 import javax.servlet.http.HttpServletRequest; 031 import javax.servlet.http.HttpServletResponse; 032 import java.io.IOException; 033 034 public class MonitoringFilter implements Filter { 035 @Override 036 public void init(final FilterConfig filterConfig) throws ServletException { 037 // no-op 038 } 039 040 @Override 041 public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException { 042 if (HttpServletRequest.class.isInstance(request)) { 043 final HttpServletRequest httpRequest = HttpServletRequest.class.cast(request); 044 final HttpServletResponse httpResponse = HttpServletResponse.class.cast(response); 045 doFilter(httpRequest, httpResponse, chain); 046 } else { 047 // Not an HTTP request... 048 chain.doFilter(request, response); 049 } 050 } 051 052 @Override 053 public void destroy() { 054 // no-op 055 } 056 057 protected void doFilter(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain) throws IOException, ServletException { 058 final String uri = getRequestedUri(request); 059 final StopWatch stopWatch = Repository.INSTANCE.start(Repository.INSTANCE.getCounter(new Counter.Key(Role.WEB, uri))); 060 try { 061 chain.doFilter(request, response); 062 } finally { 063 stopWatch.stop(); 064 } 065 } 066 067 protected String getRequestedUri(final HttpServletRequest request) { 068 final String uri = request.getRequestURI(); 069 final String context = request.getContextPath(); 070 return uri.substring(context.length()); 071 } 072 }