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annotate src/org/eclipse/jetty/http/AbstractGenerator.java @ 1045:48506d03e230

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tutorial fix
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 06 Nov 2016 14:54:43 -0700
parents a7319f14ba1e
children a8c92b0a08ed
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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.http;
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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.io.Buffer;
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24 import org.eclipse.jetty.io.Buffers;
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25 import org.eclipse.jetty.io.ByteArrayBuffer;
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26 import org.eclipse.jetty.io.EndPoint;
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27 import org.eclipse.jetty.io.EofException;
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28 import org.slf4j.Logger;
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29 import org.slf4j.LoggerFactory;
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30
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31 /* ------------------------------------------------------------ */
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32 /**
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33 * Abstract Generator. Builds HTTP Messages.
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34 *
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35 * Currently this class uses a system parameter "jetty.direct.writers" to control
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36 * two optional writer to byte conversions. buffer.writers=true will probably be
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37 * faster, but will consume more memory. This option is just for testing and tuning.
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38 *
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39 */
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40 abstract class AbstractGenerator
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41 {
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42 private static final Logger LOG = LoggerFactory.getLogger(AbstractGenerator.class);
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43
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44 public static final boolean LAST=true;
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45 public static final boolean MORE=false;
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46
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47 // states
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48 final static int STATE_HEADER = 0;
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49 final static int STATE_CONTENT = 2;
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50 final static int STATE_FLUSHING = 3;
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51 final static int STATE_END = 4;
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52
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53 // data
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54
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55 final Buffers _buffers; // source of buffers
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56 final EndPoint _endp;
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57
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58 int _state = STATE_HEADER;
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59
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60 int _status = 0;
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61 int _version = HttpVersions.HTTP_1_1_ORDINAL;
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62 Buffer _reason;
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63 Buffer _method;
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64 String _uri;
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65
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66 long _contentWritten = 0;
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67 long _contentLength = HttpTokens.UNKNOWN_CONTENT;
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68 boolean _last = false;
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69 boolean _head = false;
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70 boolean _noContent = false;
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71 Boolean _persistent = null;
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72
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73 Buffer _header; // Buffer for HTTP header (and maybe small _content)
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74 Buffer _buffer; // Buffer for copy of passed _content
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75 Buffer _content; // Buffer passed to addContent
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76
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77
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78 /* ------------------------------------------------------------------------------- */
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79 /**
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80 * Constructor.
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81 *
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82 * @param buffers buffer pool
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83 * @param io the end point
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84 */
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85 AbstractGenerator(Buffers buffers, EndPoint io)
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86 {
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87 this._buffers = buffers;
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88 this._endp = io;
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89 }
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90
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91 /* ------------------------------------------------------------ */
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92 /**
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93 * Add content.
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94 *
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95 * @param content
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96 * @param last
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97 * @throws IllegalArgumentException if <code>content</code> is {@link Buffer#isImmutable immutable}.
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98 * @throws IllegalStateException If the request is not expecting any more content,
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99 * or if the buffers are full and cannot be flushed.
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100 * @throws IOException if there is a problem flushing the buffers.
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101 */
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102 public abstract void addContent(Buffer content, boolean last) throws IOException;
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103
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104 abstract boolean isRequest();
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105
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106 public final boolean isOpen()
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107 {
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108 return _endp.isOpen();
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109 }
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110
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111 public final void resetBuffer()
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112 {
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113 if(_state>=STATE_FLUSHING)
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114 throw new IllegalStateException("Flushed");
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115
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116 _last = false;
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117 _persistent = null;
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118 _contentWritten = 0;
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119 _contentLength = HttpTokens.UNKNOWN_CONTENT;
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120 _content=null;
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121 if (_buffer!=null)
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122 _buffer.clear();
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123 }
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124
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125 /* ------------------------------------------------------------ */
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126 /**
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127 * @return Returns the contentBufferSize.
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128 */
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129 public final int getContentBufferSize()
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130 {
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131 if (_buffer==null)
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132 _buffer = _buffers.getBuffer();
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133 return _buffer.capacity();
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134 }
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135
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136 public final Buffer getUncheckedBuffer()
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137 {
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138 return _buffer;
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139 }
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140
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141 public final boolean isComplete()
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142 {
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143 return _state == STATE_END;
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144 }
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145
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146 public final boolean isIdle()
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147 {
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148 return _state == STATE_HEADER && _method==null && _status==0;
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149 }
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150
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151 public final boolean isCommitted()
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152 {
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153 return _state != STATE_HEADER;
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154 }
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155
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156 public final void setContentLength(long value)
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157 {
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158 if (value<0)
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159 _contentLength=HttpTokens.UNKNOWN_CONTENT;
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160 else
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161 _contentLength=value;
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162 }
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163
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164 public final void setHead(boolean head)
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165 {
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166 _head = head;
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167 }
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168
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169 /* ------------------------------------------------------------ */
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170 /**
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171 * @return <code>false</code> if the connection should be closed after a request has been read,
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172 * <code>true</code> if it should be used for additional requests.
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173 */
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174 public final boolean isPersistent()
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175 {
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176 return _persistent!=null
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177 ?_persistent.booleanValue()
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178 :(isRequest()?true:_version>HttpVersions.HTTP_1_0_ORDINAL);
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179 }
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180
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181 public final void setPersistent(boolean persistent)
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182 {
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183 _persistent = persistent;
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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 * @param version The version of the client the response is being sent to (NB. Not the version
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189 * in the response, which is the version of the server).
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190 */
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191 public final void setVersion(int version)
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192 {
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193 if (_state != STATE_HEADER)
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194 throw new IllegalStateException("STATE!=START "+_state);
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195 _version = version;
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196 if (_version==HttpVersions.HTTP_0_9_ORDINAL && _method!=null)
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197 _noContent=true;
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198 }
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199
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200 /* ------------------------------------------------------------ */
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201 /**
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202 * @param status The status code to send.
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203 * @param reason the status message to send.
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204 */
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205 public final void setResponse(int status, String reason)
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206 {
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207 if (_state != STATE_HEADER) throw new IllegalStateException("STATE!=START");
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208 _method=null;
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209 _status = status;
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210 if (reason!=null)
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211 {
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212 int len=reason.length();
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213
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214 // TODO don't hard code
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215 if (len>1024)
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216 len=1024;
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217 _reason = new ByteArrayBuffer(len);
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218 for (int i=0;i<len;i++)
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219 {
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220 char ch = reason.charAt(i);
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221 if (ch!='\r'&&ch!='\n')
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222 _reason.put((byte)ch);
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223 else
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224 _reason.put((byte)' ');
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225 }
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226 }
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227 }
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228
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229 public final void completeUncheckedAddContent()
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230 {
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231 if (_noContent)
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232 {
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233 if(_buffer!=null)
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234 _buffer.clear();
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235 }
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236 else
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237 {
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238 _contentWritten+=_buffer.remaining();
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239 if (_head)
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240 _buffer.clear();
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241 }
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242 }
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243
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244 public boolean isBufferFull()
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245 {
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246 if (_buffer != null && _buffer.space()==0)
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247 {
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248 if (_buffer.remaining()==0)
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249 _buffer.compact();
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250 return _buffer.space()==0;
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251 }
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252
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253 return _content!=null && _content.remaining()>0;
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254 }
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255
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256 public final boolean isWritten()
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257 {
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258 return _contentWritten>0;
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259 }
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260
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261 public final boolean isAllContentWritten()
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262 {
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263 return _contentLength>=0 && _contentWritten>=_contentLength;
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264 }
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265
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266 public abstract void completeHeader(HttpFields fields, boolean allContentAdded) throws IOException;
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267
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268 /* ------------------------------------------------------------ */
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269 /**
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270 * Complete the message.
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271 *
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272 * @throws IOException
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273 */
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274 public void complete() throws IOException
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275 {
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276 if (_state == STATE_HEADER)
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277 {
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278 throw new IllegalStateException("State==HEADER");
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279 }
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280
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281 if (_contentLength >= 0 && _contentLength != _contentWritten && !_head)
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282 {
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283 if (LOG.isDebugEnabled())
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284 LOG.debug("ContentLength written=="+_contentWritten+" != contentLength=="+_contentLength);
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285 _persistent = false;
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286 }
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287 }
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288
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289 public abstract int flushBuffer() throws IOException;
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290
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291
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292 public final void flush(long maxIdleTime) throws IOException
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293 {
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294 // block until everything is flushed
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295 long now=System.currentTimeMillis();
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296 long end=now+maxIdleTime;
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297 Buffer content = _content;
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298 Buffer buffer = _buffer;
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299 if (content!=null && content.remaining()>0 || buffer!=null && buffer.remaining()>0 || isBufferFull())
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300 {
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301 flushBuffer();
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302
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303 while (now<end && (content!=null && content.remaining()>0 ||buffer!=null && buffer.remaining()>0) && _endp.isOpen()&& !_endp.isOutputShutdown())
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304 {
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305 blockForOutput(end-now);
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306 now=System.currentTimeMillis();
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307 }
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308 }
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309 }
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310
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311 /* ------------------------------------------------------------ */
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312 /**
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313 * Utility method to send an error response. If the builder is not committed, this call is
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314 * equivalent to a setResponse, addContent and complete call.
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315 *
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316 * @param code The error code
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317 * @param reason The error reason
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318 * @param content Contents of the error page
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319 * @param close True if the connection should be closed
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320 * @throws IOException if there is a problem flushing the response
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321 */
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322 public final void sendError(int code, String reason, String content, boolean close) throws IOException
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323 {
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324 if (close)
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325 _persistent=false;
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326 if (isCommitted())
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327 {
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328 LOG.debug("sendError on committed: {} {}",code,reason);
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329 }
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330 else
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331 {
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332 LOG.debug("sendError: {} {}",code,reason);
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333 setResponse(code, reason);
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334 if (content != null)
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335 {
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336 completeHeader(null, false);
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337 addContent(new ByteArrayBuffer(content), LAST);
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338 }
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339 else if (code>=400)
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340 {
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341 completeHeader(null, false);
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921c25a05eaa remove Buffer.asReadOnlyBuffer()
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342 addContent(new ByteArrayBuffer("Error: "+(reason==null?(""+code):reason)), LAST);
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343 }
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344 else
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345 {
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346 completeHeader(null, true);
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347 }
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348 complete();
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349 }
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350 }
802
3428c60d7cfc replace jetty jars with source
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parents:
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351
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23ec25435b8c simplify AbstractGenerator
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352 public final long getContentWritten()
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353 {
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354 return _contentWritten;
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355 }
802
3428c60d7cfc replace jetty jars with source
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parents:
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356
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357
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358 public final void blockForOutput(long maxIdleTime) throws IOException
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359 {
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360 if (_endp.isBlocking())
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361 {
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diff changeset
362 try
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363 {
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364 flushBuffer();
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365 }
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366 catch(IOException e)
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367 {
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368 _endp.close();
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369 throw e;
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diff changeset
370 }
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parents: 820
diff changeset
371 }
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parents: 820
diff changeset
372 else
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parents: 820
diff changeset
373 {
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parents: 820
diff changeset
374 if (!_endp.blockWritable(maxIdleTime))
fef4392f4905 remove sendServerVersion
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parents: 820
diff changeset
375 {
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376 _endp.close();
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377 throw new EofException("timeout");
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parents: 820
diff changeset
378 }
802
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
379
877
fef4392f4905 remove sendServerVersion
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parents: 820
diff changeset
380 flushBuffer();
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diff changeset
381 }
fef4392f4905 remove sendServerVersion
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parents: 820
diff changeset
382 }
802
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
383
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
384 }