runtime/org.argeo.slc.server/src/main/java/org/argeo/slc/web/ajaxplorer/mvc/AjxpDriverServlet.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.web.ajaxplorer.mvc;
  17
  18 import java.io.IOException;
  19 import java.util.Enumeration;
  20 import java.util.Map;
  21
  22 import javax.servlet.ServletConfig;
  23 import javax.servlet.ServletException;
  24 import javax.servlet.http.HttpServletRequest;
  25 import javax.servlet.http.HttpServletResponse;
  26
  27 import org.apache.commons.logging.Log;
  28 import org.apache.commons.logging.LogFactory;
  29 import org.argeo.slc.web.ajaxplorer.AjxpAnswer;
  30 import org.argeo.slc.web.ajaxplorer.AjxpDriver;
  31 import org.springframework.beans.BeanWrapper;
  32 import org.springframework.beans.BeanWrapperImpl;
  33 import org.springframework.beans.BeansException;
  34 import org.springframework.web.context.WebApplicationContext;
  35 import org.springframework.web.context.support.WebApplicationContextUtils;
  36 import org.springframework.web.servlet.HttpServletBean;
  37
  38 public class AjxpDriverServlet extends HttpServletBean {
  39         static final long serialVersionUID = 1l;
  40
  41         protected final Log log = LogFactory.getLog(getClass());
  42         private String driverBean;
  43         private AjxpDriver driver;
  44
  45         @Override
  46         public void init(ServletConfig sc) throws ServletException {
  47                 super.init(sc);
  48                 WebApplicationContext context = WebApplicationContextUtils
  49                                 .getRequiredWebApplicationContext(sc.getServletContext());
  50                 driverBean = sc.getInitParameter("driverBean");
  51                 if (driverBean == null) {
  52                         throw new ServletException(
  53                                         "No driver found, please set the driverBean property");
  54                 }
  55
  56                 logger.info("Loading driver " + driverBean);
  57                 driver = (AjxpDriver) context.getBean(driverBean);
  58
  59                 // overrideBeanProperties(sc);
  60         }
  61
  62         @Override
  63         protected void doGet(HttpServletRequest req, HttpServletResponse resp)
  64                         throws ServletException, IOException {
  65                 processRequest("GET", req, resp);
  66         }
  67
  68         @Override
  69         protected void doPost(HttpServletRequest req, HttpServletResponse resp)
  70                         throws ServletException, IOException {
  71                 processRequest("POST", req, resp);
  72         }
  73
  74         protected void processRequest(String method, HttpServletRequest req,
  75                         HttpServletResponse resp) throws ServletException, IOException {
  76                 long id = System.currentTimeMillis();
  77                 try {
  78                         if (log.isDebugEnabled())
  79                                 logRequest(id, method, req);
  80
  81                         AjxpAnswer answer = driver.executeAction(req);
  82                         answer.updateResponse(resp);
  83
  84                         if (log.isDebugEnabled())
  85                                 log.debug(id + " " + method + " completed");
  86                 } catch (Exception e) {
  87                         log.error(id + " Cannot process request.", e);
  88                         throw new ServletException("Cannot process request " + id, e);
  89                 }
  90
  91         }
  92
  93         public void setDriverBean(String driverName) {
  94                 this.driverBean = driverName;
  95         }
  96
  97         protected void logRequest(long id, String method, HttpServletRequest req) {
  98                 if (log.isDebugEnabled()) {
  99                         StringBuffer buf = new StringBuffer(id + " Received " + method
 100                                         + ": ");
 101                         buf.append('{');
 102                         Map<String, String[]> params = req.getParameterMap();
 103                         int count1 = 0;
 104                         for (Map.Entry<String, String[]> entry : params.entrySet()) {
 105                                 if (count1 != 0)
 106                                         buf.append(", ");
 107                                 buf.append(entry.getKey()).append("={");
 108                                 int count2 = 0;
 109                                 for (String value : entry.getValue()) {
 110                                         if (count2 != 0)
 111                                                 buf.append(',');
 112                                         buf.append(value);
 113                                         count2++;
 114                                 }
 115                                 buf.append('}');
 116                                 count1++;
 117                         }
 118                         buf.append('}');
 119                         log.debug(buf.toString());
 120                 }
 121         }
 122
 123         protected void overrideBeanProperties(ServletConfig sc)
 124                         throws ServletException {
 125                 BeanWrapper wrapper = new BeanWrapperImpl(driver);
 126                 Enumeration<String> en = sc.getInitParameterNames();
 127                 while (en.hasMoreElements()) {
 128                         String name = en.nextElement();
 129                         if (name.indexOf(driverBean + '.') == 0
 130                                         && name.length() > (driverBean.length() + 1)) {
 131                                 String propertyName = name.substring(driverBean.length() + 1);
 132                                 String value = sc.getInitParameter(name);
 133                                 if (value != null) {
 134                                         try {
 135                                                 wrapper.setPropertyValue(propertyName, value);
 136                                         } catch (BeansException e) {
 137                                                 throw new ServletException("Cannot set property "
 138                                                                 + propertyName + " of bean " + driverBean, e);
 139                                         }
 140                                 }
 141                         }
 142                 }
 143         }
 144 }