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annotate src/org/eclipse/jetty/server/AsyncHttpConnection.java @ 972:5ee36654b383

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simplify AbstractHttpConnection
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 15 Oct 2016 22:42:05 -0600
parents 866f2e801618
children d35b0a3a7a4a
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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.EndPoint;
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27 import org.eclipse.jetty.io.nio.AsyncConnection;
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28 import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
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29 import org.eclipse.jetty.server.nio.SelectChannelConnector;
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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 final 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(SelectChannelConnector connector, AsyncEndPoint endpoint)
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49 {
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50 super(connector,endpoint);
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51 _asyncEndp = endpoint;
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52 }
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53
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54 @Override
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55 public void handle() throws IOException
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56 {
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57 boolean some_progress = false;
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58 boolean progress = true;
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59
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60 try
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61 {
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62 setCurrentConnection(this);
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63
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64 // While progress and the connection has not changed
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65 while (progress)
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66 {
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67 progress=false;
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68 try
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69 {
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70 // Parse more input
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71 if (!_parser.isComplete() && _parser.parseAvailable())
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72 progress = true;
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73
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74 // Generate more output
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75 if (_generator.isCommitted() && !_generator.isComplete() && !_endp.isOutputShutdown())
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76 if (_generator.flushBuffer()>0)
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77 progress = true;
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78
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79 // Flush output
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80 _endp.flush();
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81
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82 // Has any IO been done by the endpoint itself since last loop
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83 if (_asyncEndp.hasProgressed())
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84 progress = true;
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85 }
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86 catch (HttpException e)
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87 {
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88 if (LOG.isDebugEnabled())
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89 {
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90 LOG.debug("uri="+_uri);
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91 LOG.debug("fields="+_requestFields);
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92 LOG.debug("",e);
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93 }
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94 progress = true;
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95 _generator.sendError(e.getStatus(), e.getReason(), null, true);
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96 }
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97 finally
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98 {
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99 some_progress |= progress;
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100 // Is this request/response round complete and are fully flushed?
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101 boolean parserComplete = _parser.isComplete();
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102 boolean generatorComplete = _generator.isComplete();
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103 boolean complete = parserComplete && generatorComplete;
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104 if (parserComplete)
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105 {
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106 if (generatorComplete)
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107 {
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108 // Reset the parser/generator
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109 progress=true;
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110
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111 reset();
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112
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113 // TODO Is this still required?
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114 if (!_generator.isPersistent() && !_endp.isOutputShutdown())
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115 {
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116 LOG.warn("Safety net oshut!!! IF YOU SEE THIS, PLEASE RAISE BUGZILLA");
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117 _endp.shutdownOutput();
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118 }
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119 }
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120 else
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121 {
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122 // We have finished parsing, but not generating so
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123 // we must not be interested in reading until we
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124 // have finished generating and we reset the generator
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125 _readInterested = false;
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126 LOG.debug("Disabled read interest while writing response {}", _endp);
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127 }
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128 }
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129 }
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130 }
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131 }
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132 finally
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133 {
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134 setCurrentConnection(null);
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135
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136 // return buffers
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137 _parser.returnBuffers();
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138 _generator.returnBuffers();
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139
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140 // Safety net to catch spinning
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141 if (some_progress)
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142 _total_no_progress = 0;
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143 else
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144 {
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145 _total_no_progress++;
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146 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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147 LOG.info("EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
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148 if (NO_PROGRESS_CLOSE>0 && _total_no_progress==NO_PROGRESS_CLOSE)
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149 {
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150 LOG.warn("Closing EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
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151 if (_endp instanceof SelectChannelEndPoint)
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152 ((SelectChannelEndPoint)_endp).getChannel().close();
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153 }
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154 }
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155 }
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156 }
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157
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158 @Override
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159 public void onInputShutdown() throws IOException
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160 {
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161 // If we don't have a committed response and we are not suspended
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162 if (_generator.isIdle())
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163 {
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164 // then no more can happen, so close.
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165 _endp.close();
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166 }
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167
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168 // Make idle parser seek EOF
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169 if (_parser.isIdle())
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170 _parser.setPersistent(false);
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171 }
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172
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173 @Override
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174 protected void reset()
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175 {
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176 _readInterested = true;
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177 LOG.debug("Enabled read interest {}", _endp);
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178 super.reset();
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179 }
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180
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181 @Override
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182 public boolean isSuspended()
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183 {
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184 return !_readInterested;
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185 }
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186 }