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 javax.servlet.FilterChain;
31  import javax.servlet.http.HttpServletRequest;
32  import javax.servlet.http.HttpServletResponse;
33  import javax.servlet.http.HttpSession;
34  
35  import org.apache.commons.lang.time.StopWatch;
36  
37  /**
38   * <a href="DoubleClickFilter.java.html"><b><i>View Source</i></b></a>
39   *
40   * @author Olaf Fricke
41   * @author Brian Wing Shun Chan
42   * @author Raymond Augé
43   *
44   */
45  public class DoubleClickFilter extends BasePortalFilter {
46  
47      protected void processFilter(
48              HttpServletRequest request, HttpServletResponse response,
49              FilterChain filterChain)
50          throws Exception {
51  
52          StopWatch stopWatch = null;
53  
54          if (_log.isDebugEnabled()) {
55              stopWatch = new StopWatch();
56  
57              stopWatch.start();
58          }
59  
60          HttpSession session = request.getSession(false);
61  
62          if (session == null) {
63              processFilter(
64                  DoubleClickFilter.class, request, response, filterChain);
65          }
66          else {
67              DoubleClickController controller = null;
68  
69              synchronized (session) {
70                  controller = (DoubleClickController)session.getAttribute(
71                      _CONTROLLER_KEY);
72  
73                  if (controller == null) {
74                      controller = new DoubleClickController();
75  
76                      session.setAttribute(_CONTROLLER_KEY, controller);
77                  }
78              }
79  
80              boolean ok = false;
81  
82              try {
83                  controller.control(request, response, filterChain);
84  
85                  ok = true;
86              }
87              finally {
88                  if (_log.isDebugEnabled()) {
89                      String completeURL = HttpUtil.getCompleteURL(request);
90  
91                      if (ok) {
92                          _log.debug(
93                              "Double click prevention succeded in " +
94                                  stopWatch.getTime() + " ms for " + completeURL);
95                      }
96                      else {
97                          _log.debug(
98                              "Double click prevention failed in " +
99                                  stopWatch.getTime() + " ms for " + completeURL);
100                     }
101                 }
102             }
103         }
104     }
105 
106     private static final String _CONTROLLER_KEY =
107         DoubleClickFilter.class.getName();
108 
109     private static Log _log = LogFactoryUtil.getLog(DoubleClickFilter.class);
110 
111 }