View Javadoc

1   /*
2    * $Id: ReloadDefinitionsAction.java 421151 2006-07-12 06:07:14Z wsmoak $
3    *
4    * Copyright 1999-2004 The Apache Software Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  
20  package org.apache.struts.tiles.actions;
21  
22  import java.io.PrintWriter;
23  
24  import javax.servlet.ServletContext;
25  import javax.servlet.http.HttpServletRequest;
26  import javax.servlet.http.HttpServletResponse;
27  
28  import org.apache.struts.action.Action;
29  import org.apache.struts.action.ActionForm;
30  import org.apache.struts.action.ActionForward;
31  import org.apache.struts.action.ActionMapping;
32  import org.apache.struts.tiles.DefinitionsFactory;
33  import org.apache.struts.tiles.DefinitionsFactoryException;
34  import org.apache.struts.tiles.TilesUtil;
35  
36  
37  
38  /***
39   * <p>A standard <strong>Action</strong> that calls the
40   * <code>reload()</code> method of our controller servlet to
41   * reload its configuration information from the configuration
42   * files (which have presumably been updated) dynamically.</p>
43   *
44   * @version $Rev: 421151 $ $Date: 2006-07-11 23:07:14 -0700 (Tue, 11 Jul 2006) $
45   */
46  
47  public class ReloadDefinitionsAction extends Action {
48  
49      /***
50       * Process the specified HTTP request, and create the corresponding HTTP
51       * response (or forward to another web component that will create it),
52       * with provision for handling exceptions thrown by the business logic.
53       *
54       * @param mapping The ActionMapping used to select this instance
55       * @param form The optional ActionForm bean for this request (if any)
56       * @param request The HTTP request we are processing
57       * @param response The HTTP response we are creating
58       *
59       * @exception Exception if the application business logic throws
60       *  an exception
61       * @since Struts 1.1
62       */
63      public ActionForward execute(ActionMapping mapping,
64                                   ActionForm form,
65                                   HttpServletRequest request,
66                                   HttpServletResponse response)
67          throws Exception
68      {
69          response.setContentType("text/plain");
70          PrintWriter writer = response.getWriter();
71  
72          try {
73            ServletContext context = getServlet().getServletContext();
74              DefinitionsFactory factory = TilesUtil.getDefinitionsFactory(request, context);
75              factory.setConfig(factory.getConfig(), context);
76              writer.println("OK");
77          } catch (ClassCastException e) {
78              writer.println("FAIL - " + e.toString());
79              getServlet().log("ReloadAction", e);
80          } catch (DefinitionsFactoryException e) {
81              writer.println("FAIL - " + e.toString());
82              getServlet().log("ReloadAction", e);
83          }
84  
85          writer.flush();
86          writer.close();
87  
88          return (null);
89  
90      }
91  
92  }