1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.servlet.filters.doubleclick;
21  
22  import com.liferay.portal.kernel.log.Log;
23  import com.liferay.portal.kernel.log.LogFactoryUtil;
24  import com.liferay.portal.kernel.util.HttpUtil;
25  import com.liferay.portal.servlet.filters.BasePortalFilter;
26  
27  import java.io.IOException;
28  
29  import javax.servlet.FilterChain;
30  import javax.servlet.ServletException;
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 IOException, ServletException {
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 }