1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.httpmonitor.proxy; |
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16 | |
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17 | import java.io.IOException; |
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18 | import java.net.URI; |
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19 | import java.net.URISyntaxException; |
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20 | import java.nio.ByteBuffer; |
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21 | import java.util.Iterator; |
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22 | |
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23 | import javax.servlet.http.HttpServletRequest; |
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24 | import javax.servlet.http.HttpServletResponse; |
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25 | |
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26 | import org.eclipse.jetty.client.api.ContentProvider; |
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27 | import org.eclipse.jetty.client.api.Request; |
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28 | import org.eclipse.jetty.client.api.Response; |
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29 | import org.eclipse.jetty.proxy.ProxyServlet; |
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30 | |
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31 | import de.ugoe.cs.autoquest.httpmonitor.exchange.Status; |
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32 | import de.ugoe.cs.util.console.Console; |
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33 | |
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34 | /** |
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35 | * <p> |
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36 | * TODO document |
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37 | * the servlet deployed in the web server that receives all client messages and returns the client |
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38 | * java script. The messages are parsed, validated, and forwarded to the provided message listener. |
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39 | * If a message is not valid, it is discarded. If an event in a message is not valid, it is |
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40 | * discarded. Messages are only received via the POST HTTP method. The GET HTTP method is only |
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41 | * implemented for returning the client java script. |
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42 | * </p> |
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43 | * |
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44 | * @author Patrick Harms |
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45 | */ |
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46 | class HttpMonitoringProxyServlet extends ProxyServlet { |
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47 | |
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48 | /** */ |
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49 | private static final long serialVersionUID = 1L; |
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50 | |
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51 | /** */ |
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52 | private String proxiedServer; |
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53 | |
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54 | /** */ |
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55 | private int proxiedPort; |
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56 | |
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57 | /** */ |
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58 | private ExchangeListenerManager exchangeListenerManager; |
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59 | |
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60 | /** |
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61 | * <p> |
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62 | * initializes the servlet with the message listener to which all events shall be forwarded |
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63 | * </p> |
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64 | * |
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65 | * @param messageListener the message listener that shall receive all client events |
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66 | */ |
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67 | HttpMonitoringProxyServlet(String proxiedServer, |
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68 | int proxiedPort, |
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69 | ExchangeListenerManager exchangeListenerManager) |
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70 | { |
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71 | this.proxiedServer = proxiedServer; |
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72 | this.proxiedPort = proxiedPort; |
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73 | this.exchangeListenerManager = exchangeListenerManager; |
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74 | } |
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75 | |
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76 | /* (non-Javadoc) |
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77 | * @see org.eclipse.jetty.proxy.ProxyServlet#rewriteURI(javax.servlet.http.HttpServletRequest) |
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78 | */ |
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79 | @Override |
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80 | protected URI rewriteURI(HttpServletRequest request) { |
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81 | try { |
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82 | return new URI(request.getScheme(), null, proxiedServer, proxiedPort, |
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83 | request.getPathTranslated(), request.getQueryString(), null); |
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84 | } |
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85 | catch (URISyntaxException e) { |
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86 | Console.printerrln("could not rewrite URI: " + e); |
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87 | Console.logException(e); |
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88 | return null; |
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89 | } |
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90 | } |
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91 | |
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92 | /* (non-Javadoc) |
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93 | * @see org.eclipse.jetty.proxy.ProxyServlet#customizeProxyRequest(org.eclipse.jetty.client.api.Request, javax.servlet.http.HttpServletRequest) |
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94 | */ |
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95 | @Override |
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96 | protected void customizeProxyRequest(Request proxyRequest, HttpServletRequest request) { |
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97 | super.customizeProxyRequest(proxyRequest, request); |
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98 | |
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99 | exchangeListenerManager.onRequest(request); |
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100 | proxyRequest.content(new DubbingContentProvider(request, proxyRequest.getContent())); |
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101 | } |
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102 | |
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103 | /* (non-Javadoc) |
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104 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseContent(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response, byte[], int, int) |
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105 | */ |
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106 | @Override |
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107 | protected void onResponseContent(HttpServletRequest request, |
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108 | HttpServletResponse response, |
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109 | Response proxyResponse, |
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110 | byte[] buffer, |
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111 | int offset, |
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112 | int length) |
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113 | throws IOException |
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114 | { |
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115 | super.onResponseContent(request, response, proxyResponse, buffer, offset, length); |
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116 | |
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117 | exchangeListenerManager.onResponseContent(request, ByteBuffer.wrap(buffer, offset, length)); |
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118 | } |
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119 | |
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120 | /* (non-Javadoc) |
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121 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseSuccess(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response) |
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122 | */ |
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123 | @Override |
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124 | protected void onResponseSuccess(HttpServletRequest request, |
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125 | HttpServletResponse response, |
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126 | Response proxyResponse) |
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127 | { |
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128 | exchangeListenerManager.onResponse(request, response); |
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129 | exchangeListenerManager.onFinish(request, Status.SUCCESS); |
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130 | |
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131 | super.onResponseSuccess(request, response, proxyResponse); |
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132 | } |
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133 | |
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134 | /* (non-Javadoc) |
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135 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseFailure(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response, java.lang.Throwable) |
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136 | */ |
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137 | @Override |
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138 | protected void onResponseFailure(HttpServletRequest request, |
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139 | HttpServletResponse response, |
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140 | Response proxyResponse, |
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141 | Throwable failure) |
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142 | { |
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143 | exchangeListenerManager.onResponse(request, response); |
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144 | exchangeListenerManager.onFinish(request, Status.FAILURE); |
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145 | |
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146 | super.onResponseFailure(request, response, proxyResponse, failure); |
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147 | } |
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148 | |
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149 | /** |
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150 | * |
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151 | */ |
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152 | private class DubbingContentProvider implements ContentProvider { |
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153 | |
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154 | /** */ |
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155 | private HttpServletRequest request; |
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156 | |
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157 | /** */ |
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158 | private ContentProvider delegate; |
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159 | |
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160 | /** |
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161 | * |
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162 | */ |
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163 | public DubbingContentProvider(HttpServletRequest request, ContentProvider delegate) { |
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164 | this.request = request; |
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165 | this.delegate = delegate; |
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166 | } |
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167 | |
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168 | /* (non-Javadoc) |
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169 | * @see java.lang.Iterable#iterator() |
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170 | */ |
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171 | @Override |
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172 | public Iterator<ByteBuffer> iterator() { |
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173 | return new DubbingByteBufferIterator(request, delegate.iterator()); |
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174 | } |
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175 | |
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176 | /* (non-Javadoc) |
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177 | * @see org.eclipse.jetty.client.api.ContentProvider#getLength() |
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178 | */ |
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179 | @Override |
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180 | public long getLength() { |
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181 | return delegate.getLength(); |
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182 | } |
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183 | |
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184 | } |
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185 | |
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186 | /** |
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187 | * |
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188 | */ |
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189 | public class DubbingByteBufferIterator implements Iterator<ByteBuffer> { |
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190 | |
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191 | /** */ |
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192 | private HttpServletRequest request; |
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193 | |
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194 | /** */ |
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195 | private Iterator<ByteBuffer> delegate; |
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196 | |
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197 | /** |
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198 | * |
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199 | */ |
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200 | public DubbingByteBufferIterator(HttpServletRequest request, Iterator<ByteBuffer> delegate) { |
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201 | this.request = request; |
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202 | this.delegate = delegate; |
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203 | } |
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204 | |
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205 | /* (non-Javadoc) |
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206 | * @see java.util.Iterator#hasNext() |
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207 | */ |
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208 | @Override |
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209 | public boolean hasNext() { |
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210 | return delegate.hasNext(); |
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211 | } |
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212 | |
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213 | /* (non-Javadoc) |
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214 | * @see java.util.Iterator#next() |
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215 | */ |
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216 | @Override |
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217 | public ByteBuffer next() { |
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218 | ByteBuffer next = delegate.next(); |
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219 | exchangeListenerManager.onRequestContent(request, next.duplicate()); |
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220 | return next; |
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221 | } |
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222 | |
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223 | /* (non-Javadoc) |
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224 | * @see java.util.Iterator#remove() |
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225 | */ |
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226 | @Override |
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227 | public void remove() { |
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228 | delegate.remove(); |
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229 | } |
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230 | |
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231 | } |
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232 | |
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233 | } |
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