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annotate src/org/eclipse/jetty/http/AbstractGenerator.java @ 983:23ec25435b8c

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simplify AbstractGenerator
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 16 Oct 2016 22:58:41 -0600
parents dbecd7faa1f5
children 8c13b9224cff
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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.eclipse.jetty.io.View;
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29 import org.slf4j.Logger;
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30 import org.slf4j.LoggerFactory;
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31
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32 /* ------------------------------------------------------------ */
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33 /**
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34 * Abstract Generator. Builds HTTP Messages.
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35 *
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36 * Currently this class uses a system parameter "jetty.direct.writers" to control
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37 * two optional writer to byte conversions. buffer.writers=true will probably be
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38 * faster, but will consume more memory. This option is just for testing and tuning.
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39 *
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40 */
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41 abstract class AbstractGenerator
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42 {
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43 private static final Logger LOG = LoggerFactory.getLogger(AbstractGenerator.class);
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44
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45 public static final boolean LAST=true;
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46 public static final boolean MORE=false;
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47
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48 // states
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49 final static int STATE_HEADER = 0;
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50 final static int STATE_CONTENT = 2;
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51 final static int STATE_FLUSHING = 3;
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52 final static int STATE_END = 4;
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53
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54 // data
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55
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56 final Buffers _buffers; // source of buffers
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57 final EndPoint _endp;
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58
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59 int _state = STATE_HEADER;
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60
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61 int _status = 0;
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62 int _version = HttpVersions.HTTP_1_1_ORDINAL;
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63 Buffer _reason;
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64 Buffer _method;
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65 String _uri;
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66
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67 long _contentWritten = 0;
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68 long _contentLength = HttpTokens.UNKNOWN_CONTENT;
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69 boolean _last = false;
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70 boolean _head = false;
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71 boolean _noContent = false;
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72 Boolean _persistent = null;
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73
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74 Buffer _header; // Buffer for HTTP header (and maybe small _content)
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75 Buffer _buffer; // Buffer for copy of passed _content
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76 Buffer _content; // Buffer passed to addContent
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78
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79 /* ------------------------------------------------------------------------------- */
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80 /**
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81 * Constructor.
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82 *
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83 * @param buffers buffer pool
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84 * @param io the end point
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85 */
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86 AbstractGenerator(Buffers buffers, EndPoint io)
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87 {
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88 this._buffers = buffers;
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89 this._endp = io;
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 /**
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94 * Add content.
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95 *
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96 * @param content
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97 * @param last
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98 * @throws IllegalArgumentException if <code>content</code> is {@link Buffer#isImmutable immutable}.
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99 * @throws IllegalStateException If the request is not expecting any more content,
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100 * or if the buffers are full and cannot be flushed.
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101 * @throws IOException if there is a problem flushing the buffers.
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102 */
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103 public abstract void addContent(Buffer content, boolean last) throws IOException;
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104
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105 abstract boolean isRequest();
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106
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107 public final boolean isOpen()
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108 {
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109 return _endp.isOpen();
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110 }
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111
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112 public void reset()
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113 {
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114 _state = STATE_HEADER;
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115 _status = 0;
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116 _version = HttpVersions.HTTP_1_1_ORDINAL;
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117 _reason = null;
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118 _last = false;
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119 _head = false;
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120 _noContent=false;
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121 _persistent = null;
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122 _contentWritten = 0;
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123 _contentLength = HttpTokens.UNKNOWN_CONTENT;
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124
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125 _content = null;
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126 _method = null;
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127 }
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128
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129 public final void returnBuffers()
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130 {
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131 if (_buffer!=null && _buffer.length()==0)
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132 {
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133 _buffers.returnBuffer(_buffer);
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134 _buffer=null;
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135 }
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136
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137 if (_header!=null && _header.length()==0)
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138 {
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139 _buffers.returnBuffer(_header);
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140 _header=null;
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141 }
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142 }
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143
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144 public final void resetBuffer()
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145 {
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146 if(_state>=STATE_FLUSHING)
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147 throw new IllegalStateException("Flushed");
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148
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149 _last = false;
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150 _persistent=null;
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151 _contentWritten = 0;
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152 _contentLength = HttpTokens.UNKNOWN_CONTENT;
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153 _content=null;
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154 if (_buffer!=null)
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155 _buffer.clear();
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156 }
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157
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158 /* ------------------------------------------------------------ */
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159 /**
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160 * @return Returns the contentBufferSize.
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161 */
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162 public final int getContentBufferSize()
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163 {
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164 if (_buffer==null)
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165 _buffer=_buffers.getBuffer();
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166 return _buffer.capacity();
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167 }
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168
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169 public final Buffer getUncheckedBuffer()
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170 {
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171 return _buffer;
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172 }
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173
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174 public final boolean isComplete()
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175 {
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176 return _state == STATE_END;
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177 }
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178
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179 public final boolean isIdle()
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180 {
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181 return _state == STATE_HEADER && _method==null && _status==0;
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182 }
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183
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184 public final boolean isCommitted()
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185 {
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186 return _state != STATE_HEADER;
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187 }
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188
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189 public final void setContentLength(long value)
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190 {
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191 if (value<0)
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192 _contentLength=HttpTokens.UNKNOWN_CONTENT;
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193 else
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194 _contentLength=value;
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195 }
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196
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197 public final void setHead(boolean head)
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198 {
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199 _head = head;
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200 }
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201
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202 /* ------------------------------------------------------------ */
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203 /**
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204 * @return <code>false</code> if the connection should be closed after a request has been read,
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205 * <code>true</code> if it should be used for additional requests.
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206 */
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207 public final boolean isPersistent()
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208 {
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209 return _persistent!=null
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210 ?_persistent.booleanValue()
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211 :(isRequest()?true:_version>HttpVersions.HTTP_1_0_ORDINAL);
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212 }
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213
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214 public final void setPersistent(boolean persistent)
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215 {
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216 _persistent = persistent;
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217 }
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218
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219 /* ------------------------------------------------------------ */
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220 /**
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221 * @param version The version of the client the response is being sent to (NB. Not the version
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222 * in the response, which is the version of the server).
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223 */
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224 public final void setVersion(int version)
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225 {
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226 if (_state != STATE_HEADER)
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227 throw new IllegalStateException("STATE!=START "+_state);
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228 _version = version;
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229 if (_version==HttpVersions.HTTP_0_9_ORDINAL && _method!=null)
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230 _noContent=true;
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231 }
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232
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233 /* ------------------------------------------------------------ */
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234 /**
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235 * @param status The status code to send.
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236 * @param reason the status message to send.
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237 */
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238 public final void setResponse(int status, String reason)
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239 {
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240 if (_state != STATE_HEADER) throw new IllegalStateException("STATE!=START");
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241 _method=null;
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242 _status = status;
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243 if (reason!=null)
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244 {
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245 int len=reason.length();
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246
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247 // TODO don't hard code
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248 if (len>1024)
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249 len=1024;
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250 _reason=new ByteArrayBuffer(len);
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251 for (int i=0;i<len;i++)
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252 {
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253 char ch = reason.charAt(i);
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254 if (ch!='\r'&&ch!='\n')
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255 _reason.put((byte)ch);
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256 else
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257 _reason.put((byte)' ');
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258 }
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259 }
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260 }
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261
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262 public final void completeUncheckedAddContent()
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263 {
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264 if (_noContent)
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265 {
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266 if(_buffer!=null)
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267 _buffer.clear();
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268 }
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269 else
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270 {
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271 _contentWritten+=_buffer.length();
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272 if (_head)
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273 _buffer.clear();
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274 }
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275 }
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276
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277 public boolean isBufferFull()
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278 {
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279 if (_buffer != null && _buffer.space()==0)
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280 {
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281 if (_buffer.length()==0 && !_buffer.isImmutable())
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282 _buffer.compact();
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283 return _buffer.space()==0;
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284 }
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285
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286 return _content!=null && _content.length()>0;
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287 }
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288
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289 public final boolean isWritten()
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290 {
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291 return _contentWritten>0;
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292 }
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293
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294 public final boolean isAllContentWritten()
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295 {
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296 return _contentLength>=0 && _contentWritten>=_contentLength;
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297 }
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298
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299 public abstract void completeHeader(HttpFields fields, boolean allContentAdded) throws IOException;
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300
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301 /* ------------------------------------------------------------ */
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302 /**
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303 * Complete the message.
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304 *
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305 * @throws IOException
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306 */
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307 public void complete() throws IOException
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308 {
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309 if (_state == STATE_HEADER)
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310 {
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311 throw new IllegalStateException("State==HEADER");
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312 }
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313
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314 if (_contentLength >= 0 && _contentLength != _contentWritten && !_head)
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315 {
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316 if (LOG.isDebugEnabled())
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317 LOG.debug("ContentLength written=="+_contentWritten+" != contentLength=="+_contentLength);
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318 _persistent = false;
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319 }
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320 }
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321
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322 public abstract int flushBuffer() throws IOException;
802
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323
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324
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diff changeset
325 public final void flush(long maxIdleTime) throws IOException
877
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326 {
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327 // block until everything is flushed
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328 long now=System.currentTimeMillis();
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329 long end=now+maxIdleTime;
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330 Buffer content = _content;
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331 Buffer buffer = _buffer;
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332 if (content!=null && content.length()>0 || buffer!=null && buffer.length()>0 || isBufferFull())
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333 {
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334 flushBuffer();
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335
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336 while (now<end && (content!=null && content.length()>0 ||buffer!=null && buffer.length()>0) && _endp.isOpen()&& !_endp.isOutputShutdown())
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337 {
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338 blockForOutput(end-now);
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339 now=System.currentTimeMillis();
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340 }
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341 }
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342 }
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343
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344 /* ------------------------------------------------------------ */
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345 /**
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346 * Utility method to send an error response. If the builder is not committed, this call is
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347 * equivalent to a setResponse, addContent and complete call.
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348 *
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349 * @param code The error code
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350 * @param reason The error reason
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351 * @param content Contents of the error page
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352 * @param close True if the connection should be closed
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353 * @throws IOException if there is a problem flushing the response
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354 */
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355 public final void sendError(int code, String reason, String content, boolean close) throws IOException
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356 {
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357 if (close)
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358 _persistent=false;
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359 if (isCommitted())
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360 {
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361 LOG.debug("sendError on committed: {} {}",code,reason);
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362 }
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363 else
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364 {
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365 LOG.debug("sendError: {} {}",code,reason);
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366 setResponse(code, reason);
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367 if (content != null)
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368 {
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369 completeHeader(null, false);
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370 addContent(new View(new ByteArrayBuffer(content)), LAST);
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371 }
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372 else if (code>=400)
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373 {
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374 completeHeader(null, false);
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375 addContent(new View(new ByteArrayBuffer("Error: "+(reason==null?(""+code):reason))), LAST);
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376 }
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377 else
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378 {
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379 completeHeader(null, true);
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380 }
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381 complete();
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382 }
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383 }
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384
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385 public final long getContentWritten()
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386 {
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387 return _contentWritten;
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388 }
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389
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390
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391 public final void blockForOutput(long maxIdleTime) throws IOException
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392 {
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393 if (_endp.isBlocking())
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394 {
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395 try
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396 {
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397 flushBuffer();
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398 }
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399 catch(IOException e)
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400 {
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401 _endp.close();
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402 throw e;
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403 }
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404 }
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405 else
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406 {
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407 if (!_endp.blockWritable(maxIdleTime))
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408 {
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409 _endp.close();
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410 throw new EofException("timeout");
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411 }
802
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412
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413 flushBuffer();
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414 }
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415 }
802
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416
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417 }