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annotate src/org/eclipse/jetty/io/nio/SelectChannelEndPoint.java @ 982:dbecd7faa1f5

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author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 16 Oct 2016 21:40:27 -0600
parents 5ee36654b383
children 35d04ac3fd0b
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rev   line source
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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.io.nio;
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20
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21 import java.io.IOException;
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22 import java.io.InterruptedIOException;
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23 import java.nio.channels.ClosedChannelException;
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24 import java.nio.channels.SelectableChannel;
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25 import java.nio.channels.SelectionKey;
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26 import java.nio.channels.SocketChannel;
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27 import java.util.Locale;
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28 import java.util.concurrent.RejectedExecutionException;
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29
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30 import org.eclipse.jetty.io.AsyncEndPoint;
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31 import org.eclipse.jetty.io.Buffer;
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32 import org.eclipse.jetty.io.EofException;
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33 import org.slf4j.Logger;
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34 import org.slf4j.LoggerFactory;
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35
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36
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37 /* ------------------------------------------------------------ */
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38 /**
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39 * An Endpoint that can be scheduled by {@link SelectorManager}.
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40 */
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41 public final class SelectChannelEndPoint extends ChannelEndPoint implements AsyncEndPoint
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42 {
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43 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio");
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44
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45 private final SelectorManager _manager;
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46 private final SelectionKey _key;
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47 private final Runnable _handler = new Runnable()
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48 {
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49 public void run() { handle(); }
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50 };
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51
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52 /**
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53 * The connection instance is the handler for any IO activity on the endpoint.
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54 * There is a different type of connection for HTTP, AJP, WebSocket and
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55 * ProxyConnect. The connection may change for an SCEP as it is upgraded
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56 * from HTTP to proxy connect or websocket.
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57 */
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58 private final AsyncConnection _connection;
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59 /*
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60 private static final int STATE_NEEDS_DISPATCH = -1;
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61 private static final int STATE_UNDISPATCHED = 0;
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62 private static final int STATE_DISPATCHED = 1;
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63 private int _state;
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64 */
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65 private boolean isDispatched = false;
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66
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67 /** true if the last write operation succeed and wrote all offered bytes */
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68 private volatile boolean _writable = true;
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69
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70 /** True if a thread has is blocked in {@link #blockReadable(long)} */
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71 private boolean _readBlocked;
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72
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73 /** True if a thread has is blocked in {@link #blockWritable(long)} */
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74 private boolean _writeBlocked;
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75
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76 private boolean _ishut = false;
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77
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78 public SelectChannelEndPoint(SocketChannel channel, SelectorManager manager, SelectionKey key, int maxIdleTime)
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79 throws IOException
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80 {
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81 super(channel, maxIdleTime);
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82
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83 _manager = manager;
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84 _key = key;
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85 _connection = manager.newConnection(channel,this);
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86 }
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87
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88 /* ------------------------------------------------------------ */
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89 /** Called by selectSet to schedule handling
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90 *
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91 */
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92 public synchronized void schedule()
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93 {
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94 if (!_key.isValid())
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95 {
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96 /*
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97 _readBlocked = false;
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98 _writeBlocked = false;
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99 this.notifyAll();
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100 */
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101 _key.cancel();
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102 return;
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103 }
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104
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105 // If there are threads dispatched reading and writing
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106 if (_readBlocked || _writeBlocked)
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107 {
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108 // assert _dispatched;
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109 if (_readBlocked && _key.isReadable())
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110 _readBlocked = false;
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111 if (_writeBlocked && _key.isWritable())
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112 _writeBlocked = false;
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113
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114 // wake them up is as good as a dispatched.
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115 this.notifyAll();
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116
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117 // we are not interested in further selecting
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118 _key.interestOps(0);
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119 if( !isDispatched )
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120 updateKey();
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121 return;
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122 }
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123
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124 // Remove writeable op
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125 if ((_key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE && (_key.interestOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE)
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126 {
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127 // Remove writeable op
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128 int interestOps = _key.interestOps() & ~SelectionKey.OP_WRITE;
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129 _key.interestOps(interestOps);
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130 _writable = true; // Once writable is in ops, only removed with dispatch.
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131 }
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132
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133 // If dispatched, then deregister interest
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134 if (isDispatched)
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135 _key.interestOps(0);
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136 else
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137 {
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138 // other wise do the dispatch
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139 dispatch();
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140 }
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141 }
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142
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143 @Override
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144 public synchronized void dispatch()
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145 {
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146 if( !isDispatched )
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147 {
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148 isDispatched = true;
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149 try {
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150 _manager.execute(_handler);
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151 } catch(RejectedExecutionException e) {
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152 isDispatched = false;
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153 LOG.warn("Dispatched Failed! "+this+" to "+_manager);
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154 // updateKey();
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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 @Override
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160 public int fill(Buffer buffer) throws IOException
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161 {
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162 int fill=super.fill(buffer);
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163 return fill;
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164 }
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165
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166 @Override
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167 public int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException
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168 {
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169 int l = super.flush(header, buffer, trailer);
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170
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171 // If there was something to write and it wasn't written, then we are not writable.
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172 if (l==0 && ( header!=null && header.hasContent() || buffer!=null && buffer.hasContent() || trailer!=null && trailer.hasContent()))
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173 {
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174 synchronized (this)
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175 {
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176 _writable = false;
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177 if( !isDispatched )
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178 updateKey();
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179 }
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180 }
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181 else if (l>0)
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182 {
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183 _writable = true;
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184 }
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185 return l;
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186 }
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187
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188 @Override
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189 public int flush(Buffer buffer) throws IOException
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190 {
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191 int l = super.flush(buffer);
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192
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193 // If there was something to write and it wasn't written, then we are not writable.
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194 if (l==0 && buffer!=null && buffer.hasContent())
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195 {
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196 synchronized (this)
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197 {
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198 _writable = false;
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199 if( !isDispatched )
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200 updateKey();
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201 }
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202 }
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203 else if (l>0)
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204 {
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205 _writable = true;
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206 }
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207
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208 return l;
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209 }
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210
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211 /* ------------------------------------------------------------ */
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212 /*
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213 * Allows thread to block waiting for further events.
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214 */
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215 @Override
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216 public synchronized boolean blockReadable(long timeoutMs) throws IOException
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217 {
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218 if (isInputShutdown())
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219 throw new EofException();
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220
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221 long now = _manager.getNow();
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222 long end = now+timeoutMs;
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223 try
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224 {
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225 _readBlocked = true;
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226 while (!isInputShutdown() && _readBlocked)
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227 {
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228 try
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229 {
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230 updateKey();
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231 this.wait(timeoutMs>0?(end-now):10000);
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232 }
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233 catch (final InterruptedException e)
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234 {
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235 LOG.warn("",e);
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236 }
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237 finally
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238 {
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239 now = _manager.getNow();
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240 }
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241
963
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242 if (_readBlocked && timeoutMs>0 && now>=end)
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243 return false;
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244 }
963
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245 }
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246 finally
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247 {
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248 _readBlocked = false;
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249 }
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250 return true;
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251 }
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252
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diff changeset
253 /* ------------------------------------------------------------ */
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diff changeset
254 /*
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diff changeset
255 * Allows thread to block waiting for further events.
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diff changeset
256 */
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diff changeset
257 @Override
963
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diff changeset
258 public synchronized boolean blockWritable(long timeoutMs) throws IOException
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259 {
963
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diff changeset
260 if (isOutputShutdown())
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diff changeset
261 throw new EofException();
802
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262
964
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diff changeset
263 long now=_manager.getNow();
963
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diff changeset
264 long end=now+timeoutMs;
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diff changeset
265 try
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diff changeset
266 {
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267 _writeBlocked = true;
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diff changeset
268 while (_writeBlocked && !isOutputShutdown())
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269 {
963
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270 try
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diff changeset
271 {
963
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diff changeset
272 updateKey();
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diff changeset
273 this.wait(timeoutMs>0?(end-now):10000);
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diff changeset
274 }
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diff changeset
275 catch (final InterruptedException e)
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276 {
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277 LOG.warn("",e);
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278 }
963
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279 finally
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280 {
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281 now = _manager.getNow();
963
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diff changeset
282 }
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diff changeset
283 if (_writeBlocked && timeoutMs>0 && now>=end)
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284 return false;
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diff changeset
285 }
963
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diff changeset
286 }
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diff changeset
287 finally
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diff changeset
288 {
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289 _writeBlocked = false;
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290 }
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291 return true;
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292 }
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293
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diff changeset
294 @Override
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diff changeset
295 public boolean hasProgressed()
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296 {
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297 return false;
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298 }
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299
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diff changeset
300 /* ------------------------------------------------------------ */
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diff changeset
301 /**
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diff changeset
302 * Updates selection key. Adds operations types to the selection key as needed. No operations
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diff changeset
303 * are removed as this is only done during dispatch. This method records the new key and
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304 * schedules a call to doUpdateKey to do the keyChange
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diff changeset
305 */
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diff changeset
306 private synchronized void updateKey()
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diff changeset
307 {
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diff changeset
308 if( getChannel().isOpen() && _key.isValid())
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diff changeset
309 {
963
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diff changeset
310 boolean read_interest = _readBlocked || (!isDispatched && !_connection.isSuspended());
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diff changeset
311 boolean write_interest = _writeBlocked || (!isDispatched && !_writable);
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diff changeset
312 // boolean write_interest = _writeBlocked || !isDispatched;
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diff changeset
313 // boolean write_interest = true;
802
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314
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diff changeset
315 int interestOps =
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diff changeset
316 ((!_socket.isInputShutdown() && read_interest ) ? SelectionKey.OP_READ : 0)
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diff changeset
317 | ((!_socket.isOutputShutdown()&& write_interest) ? SelectionKey.OP_WRITE : 0);
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diff changeset
318 if( _key.interestOps() != interestOps ) {
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diff changeset
319 _key.interestOps(interestOps);
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diff changeset
320 _manager.getSelector().update();
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diff changeset
321 }
962
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322 } else {
94498d6daf5b remove SelectChannelEndPoint._interestOps
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323 _key.cancel();
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324 // update needed?
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325 }
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326 }
802
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327
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328
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329 private void handle()
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330 {
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331 try
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332 {
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333 try
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334 {
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866f2e801618 handle() returns void
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335 _connection.handle();
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336 }
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337 catch (ClosedChannelException e)
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338 {
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339 LOG.trace("",e);
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340 }
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341 catch (EofException e)
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342 {
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343 LOG.debug("EOF", e);
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344 try{close();}
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345 catch(IOException e2){LOG.trace("",e2);}
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346 }
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347 catch (IOException e)
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348 {
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349 LOG.warn(e.toString());
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350 try{close();}
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351 catch(IOException e2){LOG.trace("",e2);}
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352 }
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353 catch (Throwable e)
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354 {
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355 LOG.warn("handle failed", e);
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356 try{close();}
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357 catch(IOException e2){LOG.trace("",e2);}
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358 }
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359 finally
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360 {
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361 if (!_ishut && isInputShutdown() && isOpen())
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362 {
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363 _ishut = true;
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364 try
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365 {
64f3d8dae31d simplify SelectChannelEndPoint
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366 _connection.onInputShutdown();
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367 }
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368 catch(Throwable x)
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diff changeset
369 {
64f3d8dae31d simplify SelectChannelEndPoint
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370 LOG.warn("onInputShutdown failed", x);
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371 try{close();}
64f3d8dae31d simplify SelectChannelEndPoint
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diff changeset
372 catch(IOException e2){LOG.trace("",e2);}
64f3d8dae31d simplify SelectChannelEndPoint
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diff changeset
373 }
865
6b210bb66c63 remove ThreadPool
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diff changeset
374 }
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diff changeset
375 }
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diff changeset
376 }
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diff changeset
377 finally
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diff changeset
378 {
963
4b6216fa9cec replace SelectChannelEndPoint._state with isDispatched
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379 isDispatched = false;
960
3cd4c706a61f simplify ChannelEndPoint
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380 updateKey();
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diff changeset
381 }
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382 }
802
3428c60d7cfc replace jetty jars with source
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parents:
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383
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diff changeset
384 @Override
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385 public void close() throws IOException
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386 {
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diff changeset
387 try
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diff changeset
388 {
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diff changeset
389 super.close();
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390 }
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diff changeset
391 catch (IOException e)
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diff changeset
392 {
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diff changeset
393 LOG.trace("",e);
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diff changeset
394 }
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diff changeset
395 finally
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diff changeset
396 {
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diff changeset
397 updateKey();
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diff changeset
398 }
6b210bb66c63 remove ThreadPool
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diff changeset
399 }
802
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
400
865
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parents: 820
diff changeset
401 @Override
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diff changeset
402 public String toString()
6b210bb66c63 remove ThreadPool
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diff changeset
403 {
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diff changeset
404 // Do NOT use synchronized (this)
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
405 // because it's very easy to deadlock when debugging is enabled.
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diff changeset
406 // We do a best effort to print the right toString() and that's it.
6b210bb66c63 remove ThreadPool
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diff changeset
407 SelectionKey key = _key;
6b210bb66c63 remove ThreadPool
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diff changeset
408 String keyString = "";
961
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
409 if (key.isValid())
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
410 {
961
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
411 if (key.isReadable())
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
412 keyString += "r";
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
413 if (key.isWritable())
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
414 keyString += "w";
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
415 }
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
416 else
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
417 {
961
790c01734386 make SelectChannelEndPoint._key final
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parents: 960
diff changeset
418 keyString += "!";
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
419 }
963
4b6216fa9cec replace SelectChannelEndPoint._state with isDispatched
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parents: 962
diff changeset
420 return String.format("SCEP@%x{l(%s)<->r(%s),dispatched=%b,open=%b,ishut=%b,oshut=%b,rb=%b,wb=%b,w=%b,i=%s}-{%s}",
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
421 hashCode(),
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
422 _socket.getRemoteSocketAddress(),
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
423 _socket.getLocalSocketAddress(),
963
4b6216fa9cec replace SelectChannelEndPoint._state with isDispatched
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parents: 962
diff changeset
424 isDispatched,
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
425 isOpen(),
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
426 isInputShutdown(),
6b210bb66c63 remove ThreadPool
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diff changeset
427 isOutputShutdown(),
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
428 _readBlocked,
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
429 _writeBlocked,
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
430 _writable,
6b210bb66c63 remove ThreadPool
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diff changeset
431 keyString,
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
432 _connection);
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
433 }
802
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
434
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
435 /* ------------------------------------------------------------ */
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
436 /**
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
437 * Don't set the SoTimeout
6b210bb66c63 remove ThreadPool
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diff changeset
438 * @see org.eclipse.jetty.io.nio.ChannelEndPoint#setMaxIdleTime(int)
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
439 */
6b210bb66c63 remove ThreadPool
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diff changeset
440 @Override
6b210bb66c63 remove ThreadPool
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diff changeset
441 public void setMaxIdleTime(int timeMs) throws IOException
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
442 {
955
6f49b8dfffe6 simplify SelectChannelEndPoint
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parents: 953
diff changeset
443 _maxIdleTime = timeMs;
865
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
444 }
802
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
445
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
446 }