| DoubleClickController.java |
1 /**
2 * Copyright (c) 2000-2008 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.util.StringPool;
26 import com.liferay.util.servlet.filters.CacheResponse;
27 import com.liferay.util.servlet.filters.CacheResponseData;
28 import com.liferay.util.servlet.filters.CacheResponseUtil;
29
30 import java.io.IOException;
31 import java.io.Serializable;
32
33 import javax.servlet.FilterChain;
34 import javax.servlet.ServletException;
35 import javax.servlet.http.HttpServletRequest;
36 import javax.servlet.http.HttpServletResponse;
37
38 /**
39 * <a href="DoubleClickController.java.html"><b><i>View Source</i></b></a>
40 *
41 * @author Olaf Fricke
42 * @author Brian Wing Shun Chan
43 *
44 */
45 public class DoubleClickController implements Serializable {
46
47 public void control(
48 HttpServletRequest request, HttpServletResponse response,
49 FilterChain filterChain)
50 throws IOException, ServletException {
51
52 boolean firstRequest = false;
53
54 CacheResponse cacheResponse = null;
55
56 synchronized (this) {
57 if (_cacheResponse == null) {
58 firstRequest = true;
59
60 _cacheResponse = new CacheResponse(response, StringPool.UTF8);
61 _throwable = null;
62 }
63
64 cacheResponse = _cacheResponse;
65 }
66
67 if (firstRequest) {
68 try {
69 filterChain.doFilter(request, _cacheResponse);
70 }
71 catch (Throwable t) {
72 _throwable = t;
73 }
74 finally {
75 synchronized (this) {
76 _cacheResponse = null;
77
78 notifyAll();
79 }
80 }
81 }
82 else {
83 synchronized (this) {
84 while (_cacheResponse != null) {
85 try {
86 wait();
87 }
88 catch (InterruptedException ie) {
89 Thread.currentThread().interrupt();
90 }
91 }
92 }
93 }
94
95 if (_throwable != null) {
96 try {
97 throw _throwable;
98 }
99 catch (IOException ioe) {
100 throw ioe;
101 }
102 catch (ServletException se) {
103 throw se;
104 }
105 catch (RuntimeException re) {
106 throw re;
107 }
108 catch (Error e) {
109 throw e;
110 }
111 catch (Throwable t) {
112 throw new RuntimeException(t);
113 }
114 }
115
116 CacheResponseData data = new CacheResponseData(
117 cacheResponse.getData(), cacheResponse.getContentType(),
118 cacheResponse.getHeaders());
119
120 CacheResponseUtil.write(response, data);
121 }
122
123 private CacheResponse _cacheResponse;
124 private Throwable _throwable;
125
126 }