1
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
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 = Thread.currentThread();
90
91 currentThread.interrupt();
92 }
93 }
94 }
95 }
96
97 if (_throwable != null) {
98 try {
99 throw _throwable;
100 }
101 catch (IOException ioe) {
102 throw ioe;
103 }
104 catch (ServletException se) {
105 throw se;
106 }
107 catch (RuntimeException re) {
108 throw re;
109 }
110 catch (Error e) {
111 throw e;
112 }
113 catch (Throwable t) {
114 throw new RuntimeException(t);
115 }
116 }
117
118 CacheResponseData data = new CacheResponseData(
119 cacheResponse.getData(), cacheResponse.getContentType(),
120 cacheResponse.getHeaders());
121
122 CacheResponseUtil.write(response, data);
123 }
124
125 private CacheResponse _cacheResponse;
126 private Throwable _throwable;
127
128 }