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annotate src/org/eclipse/jetty/server/AsyncHttpConnection.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -0600
parents 8e9db0bbf4f9
children 3268ddf919d4
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server;
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20
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21 import java.io.IOException;
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22
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23 import org.eclipse.jetty.http.HttpException;
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24 import org.eclipse.jetty.http.HttpStatus;
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25 import org.eclipse.jetty.io.AsyncEndPoint;
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26 import org.eclipse.jetty.io.Connection;
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27 import org.eclipse.jetty.io.EndPoint;
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28 import org.eclipse.jetty.io.nio.AsyncConnection;
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29 import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
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30 import org.slf4j.Logger;
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31 import org.slf4j.LoggerFactory;
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32
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33
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34 /* ------------------------------------------------------------ */
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35 /** Asychronous Server HTTP connection
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36 *
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37 */
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38 public class AsyncHttpConnection extends AbstractHttpConnection implements AsyncConnection
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39 {
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40 private final static int NO_PROGRESS_INFO = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_INFO",100);
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41 private final static int NO_PROGRESS_CLOSE = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_CLOSE",200);
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42
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43 private static final Logger LOG = LoggerFactory.getLogger(AsyncHttpConnection.class);
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44 private int _total_no_progress;
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45 private final AsyncEndPoint _asyncEndp;
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46 private boolean _readInterested = true;
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47
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48 public AsyncHttpConnection(Connector connector, EndPoint endpoint, Server server)
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49 {
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50 super(connector,endpoint,server);
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51 _asyncEndp=(AsyncEndPoint)endpoint;
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52 }
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53
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54 @Override
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55 public Connection handle() throws IOException
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56 {
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57 Connection connection = this;
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58 boolean some_progress=false;
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59 boolean progress=true;
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60
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61 try
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62 {
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63 setCurrentConnection(this);
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64
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65 // don't check for idle while dispatched (unless blocking IO is done).
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66 _asyncEndp.setCheckForIdle(false);
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67
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68
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69 // While progress and the connection has not changed
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70 while (progress && connection==this)
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71 {
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72 progress=false;
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73 try
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74 {
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75 // Handle resumed request
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76 if (_request._async.isAsync())
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77 {
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78 if (_request._async.isDispatchable())
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79 handleRequest();
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80 }
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81 // else Parse more input
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82 else if (!_parser.isComplete() && _parser.parseAvailable())
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83 progress=true;
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84
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85 // Generate more output
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86 if (_generator.isCommitted() && !_generator.isComplete() && !_endp.isOutputShutdown() && !_request.getAsyncContinuation().isAsyncStarted())
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87 if (_generator.flushBuffer()>0)
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88 progress=true;
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89
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90 // Flush output
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91 _endp.flush();
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92
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93 // Has any IO been done by the endpoint itself since last loop
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94 if (_asyncEndp.hasProgressed())
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95 progress=true;
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96 }
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97 catch (HttpException e)
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98 {
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99 if (LOG.isDebugEnabled())
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100 {
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101 LOG.debug("uri="+_uri);
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102 LOG.debug("fields="+_requestFields);
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103 LOG.debug("",e);
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104 }
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105 progress=true;
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106 _generator.sendError(e.getStatus(), e.getReason(), null, true);
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107 }
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108 finally
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109 {
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110 some_progress|=progress;
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111 // Is this request/response round complete and are fully flushed?
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112 boolean parserComplete = _parser.isComplete();
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113 boolean generatorComplete = _generator.isComplete();
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114 boolean complete = parserComplete && generatorComplete;
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115 if (parserComplete)
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116 {
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117 if (generatorComplete)
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118 {
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119 // Reset the parser/generator
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120 progress=true;
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121
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122 // look for a switched connection instance?
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123 if (_response.getStatus()==HttpStatus.SWITCHING_PROTOCOLS_101)
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124 {
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125 Connection switched=(Connection)_request.getAttribute("org.eclipse.jetty.io.Connection");
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126 if (switched!=null)
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127 connection=switched;
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128 }
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129
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130 reset();
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131
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132 // TODO Is this still required?
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133 if (!_generator.isPersistent() && !_endp.isOutputShutdown())
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134 {
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135 LOG.warn("Safety net oshut!!! IF YOU SEE THIS, PLEASE RAISE BUGZILLA");
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136 _endp.shutdownOutput();
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137 }
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138 }
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139 else
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140 {
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141 // We have finished parsing, but not generating so
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142 // we must not be interested in reading until we
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143 // have finished generating and we reset the generator
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144 _readInterested = false;
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145 LOG.debug("Disabled read interest while writing response {}", _endp);
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146 }
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147 }
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148
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149 if (!complete && _request.getAsyncContinuation().isAsyncStarted())
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150 {
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151 // The request is suspended, so even though progress has been made,
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152 // exit the while loop by setting progress to false
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153 LOG.debug("suspended {}",this);
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154 progress=false;
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155 }
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156 }
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157 }
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158 }
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159 finally
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160 {
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161 setCurrentConnection(null);
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162
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163 // If we are not suspended
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164 if (!_request.getAsyncContinuation().isAsyncStarted())
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165 {
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166 // return buffers
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167 _parser.returnBuffers();
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168 _generator.returnBuffers();
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169
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170 // reenable idle checking unless request is suspended
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171 _asyncEndp.setCheckForIdle(true);
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172 }
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173
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174 // Safety net to catch spinning
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175 if (some_progress)
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176 _total_no_progress=0;
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177 else
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178 {
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179 _total_no_progress++;
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180 if (NO_PROGRESS_INFO>0 && _total_no_progress%NO_PROGRESS_INFO==0 && (NO_PROGRESS_CLOSE<=0 || _total_no_progress< NO_PROGRESS_CLOSE))
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181 LOG.info("EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
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182 if (NO_PROGRESS_CLOSE>0 && _total_no_progress==NO_PROGRESS_CLOSE)
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183 {
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184 LOG.warn("Closing EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
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185 if (_endp instanceof SelectChannelEndPoint)
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186 ((SelectChannelEndPoint)_endp).getChannel().close();
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187 }
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188 }
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189 }
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190 return connection;
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191 }
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192
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193 public void onInputShutdown() throws IOException
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194 {
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195 // If we don't have a committed response and we are not suspended
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196 if (_generator.isIdle() && !_request.getAsyncContinuation().isSuspended())
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197 {
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198 // then no more can happen, so close.
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199 _endp.close();
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200 }
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201
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202 // Make idle parser seek EOF
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203 if (_parser.isIdle())
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204 _parser.setPersistent(false);
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205 }
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206
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207 @Override
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208 public void reset()
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209 {
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210 _readInterested = true;
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211 LOG.debug("Enabled read interest {}", _endp);
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212 super.reset();
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213 }
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214
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215 @Override
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216 public boolean isSuspended()
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217 {
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218 return !_readInterested || super.isSuspended();
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219 }
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220 }