001 /*
002 * Copyright 2011 The Kuali Foundation.
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.kuali.kfs.sys.web.servlet;
017
018 import java.io.IOException;
019 import java.io.PrintWriter;
020 import java.io.StringWriter;
021 import java.util.ArrayList;
022
023 import javax.servlet.http.HttpServlet;
024 import javax.servlet.http.HttpServletRequest;
025 import javax.servlet.http.HttpServletResponse;
026
027 import org.kuali.kfs.coa.businessobject.Chart;
028 import org.kuali.kfs.sys.context.SpringContext;
029 import org.kuali.rice.kns.service.BusinessObjectService;
030
031 public class KualiHeartbeatServlet extends HttpServlet {
032 private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(KualiHeartbeatServlet.class);
033 /**
034 *
035 */
036 private static final long serialVersionUID = 4901222949286730892L;
037
038 public void doGet(HttpServletRequest req, HttpServletResponse resp){
039 this.doPost(req, resp);
040 }
041 public void doPost(HttpServletRequest req, HttpServletResponse resp){
042 StringBuilder sb = new StringBuilder(200);
043 sb.append("<html><head><title>heartbeat</title></head><body>");
044 try {
045 ArrayList<Chart> hbResult = (ArrayList<Chart>) SpringContext.getBean(BusinessObjectService.class).findAll(Chart.class);
046 // force a call to KIM
047 if ( hbResult.isEmpty() ) {
048 sb.append( "NO CHARTS RETRIEVED");
049 } else {
050 // we don't care what it returns, only that the call to KIM does not bomb out
051 hbResult.get(0).getFinCoaManager();
052 sb.append( "LUB-DUB,LUB-DUB");
053 }
054 } catch ( Exception ex ){
055 sb.append( "Exception running heartbeat monitor: " + ex.getClass() + ": " + ex.getMessage() );
056 StringWriter sw = new StringWriter(1000);
057 PrintWriter pw = new PrintWriter( sw );
058 ex.printStackTrace( pw );
059 sb.append( sw.toString() );
060 LOG.fatal( "Failed to detect heartbeat. Apply paddles now!", ex);
061 } finally {
062 sb.append( "</body></html>");
063 try {
064 resp.getWriter().println(sb.toString());
065 resp.addHeader("Content-Type", "text/html");
066 } catch (IOException ex) {
067 LOG.error( "Failure writing to heartbeat servlet output stream:", ex );
068 }
069 }
070 }
071 }