1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.servlet.filters.doubleclick;
24  
25  import com.liferay.portal.kernel.log.Log;
26  import com.liferay.portal.kernel.log.LogFactoryUtil;
27  import com.liferay.portal.kernel.util.HttpUtil;
28  import com.liferay.portal.servlet.filters.BasePortalFilter;
29  
30  import java.io.IOException;
31  
32  import javax.servlet.FilterChain;
33  import javax.servlet.ServletException;
34  import javax.servlet.http.HttpServletRequest;
35  import javax.servlet.http.HttpServletResponse;
36  import javax.servlet.http.HttpSession;
37  
38  import org.apache.commons.lang.time.StopWatch;
39  
40  /**
41   * <a href="DoubleClickFilter.java.html"><b><i>View Source</i></b></a>
42   *
43   * @author Olaf Fricke
44   * @author Brian Wing Shun Chan
45   * @author Raymond Augé
46   *
47   */
48  public class DoubleClickFilter extends BasePortalFilter {
49  
50      protected void processFilter(
51              HttpServletRequest request, HttpServletResponse response,
52              FilterChain filterChain)
53          throws IOException, ServletException {
54  
55          StopWatch stopWatch = null;
56  
57          if (_log.isDebugEnabled()) {
58              stopWatch = new StopWatch();
59  
60              stopWatch.start();
61          }
62  
63          HttpSession session = request.getSession(false);
64  
65          if (session == null) {
66              processFilter(
67                  DoubleClickFilter.class, request, response, filterChain);
68          }
69          else {
70              DoubleClickController controller = null;
71  
72              synchronized (session) {
73                  controller = (DoubleClickController)session.getAttribute(
74                      _CONTROLLER_KEY);
75  
76                  if (controller == null) {
77                      controller = new DoubleClickController();
78  
79                      session.setAttribute(_CONTROLLER_KEY, controller);
80                  }
81              }
82  
83              boolean ok = false;
84  
85              try {
86                  controller.control(request, response, filterChain);
87  
88                  ok = true;
89              }
90              finally {
91                  if (_log.isDebugEnabled()) {
92                      String completeURL = HttpUtil.getCompleteURL(request);
93  
94                      if (ok) {
95                          _log.debug(
96                              "Double click prevention succeded in " +
97                                  stopWatch.getTime() + " ms for " + completeURL);
98                      }
99                      else {
100                         _log.debug(
101                             "Double click prevention failed in " +
102                                 stopWatch.getTime() + " ms for " + completeURL);
103                     }
104                 }
105             }
106         }
107     }
108 
109     private static final String _CONTROLLER_KEY =
110         DoubleClickFilter.class.getName();
111 
112     private static Log _log = LogFactoryUtil.getLog(DoubleClickFilter.class);
113 
114 }