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annotate src/org/eclipse/jetty/io/nio/SelectChannelEndPoint.java @ 953:7db4a488fc82
simplify SelectorManager
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Wed, 12 Oct 2016 22:16:36 -0600 |
| parents | 669769bcdf5c |
| children | 6f49b8dfffe6 |
| 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; |
| 865 | 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.ConnectedEndPoint; |
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33 import org.eclipse.jetty.io.Connection; |
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34 import org.eclipse.jetty.io.EofException; |
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35 import org.eclipse.jetty.io.nio.SelectorManager.SelectSet; |
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36 import org.slf4j.Logger; |
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37 import org.slf4j.LoggerFactory; |
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38 |
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39 |
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40 /* ------------------------------------------------------------ */ |
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41 /** |
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42 * An Endpoint that can be scheduled by {@link SelectorManager}. |
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43 */ |
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44 public class SelectChannelEndPoint extends ChannelEndPoint implements AsyncEndPoint, ConnectedEndPoint |
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45 { |
| 865 | 46 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio"); |
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47 |
| 865 | 48 private final SelectorManager.SelectSet _selectSet; |
| 49 private final SelectorManager _manager; | |
| 50 private SelectionKey _key; | |
| 51 private final Runnable _handler = new Runnable() | |
| 52 { | |
| 53 public void run() { handle(); } | |
| 54 }; | |
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55 |
| 865 | 56 /** The desired value for {@link SelectionKey#interestOps()} */ |
| 57 private int _interestOps; | |
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58 |
| 865 | 59 /** |
| 60 * The connection instance is the handler for any IO activity on the endpoint. | |
| 61 * There is a different type of connection for HTTP, AJP, WebSocket and | |
| 62 * ProxyConnect. The connection may change for an SCEP as it is upgraded | |
| 63 * from HTTP to proxy connect or websocket. | |
| 64 */ | |
| 65 private volatile AsyncConnection _connection; | |
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66 |
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67 private static final int STATE_NEEDS_DISPATCH = -1; |
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68 private static final int STATE_UNDISPATCHED = 0; |
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69 private static final int STATE_DISPATCHED = 1; |
| 865 | 70 private int _state; |
| 71 | |
| 72 private boolean _onIdle; | |
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73 |
| 865 | 74 /** true if the last write operation succeed and wrote all offered bytes */ |
| 75 private volatile boolean _writable = true; | |
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76 |
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77 |
| 865 | 78 /** True if a thread has is blocked in {@link #blockReadable(long)} */ |
| 79 private boolean _readBlocked; | |
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80 |
| 865 | 81 /** True if a thread has is blocked in {@link #blockWritable(long)} */ |
| 82 private boolean _writeBlocked; | |
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83 |
| 865 | 84 /** true if {@link SelectSet#destroyEndPoint(SelectChannelEndPoint)} has not been called */ |
| 85 private boolean _open; | |
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86 |
| 865 | 87 private volatile long _idleTimestamp; |
| 88 private volatile boolean _checkIdle; | |
| 89 | |
| 90 private boolean _ishut; | |
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91 |
| 865 | 92 /* ------------------------------------------------------------ */ |
| 93 public SelectChannelEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key, int maxIdleTime) | |
| 94 throws IOException | |
| 95 { | |
| 96 super(channel, maxIdleTime); | |
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97 |
| 865 | 98 _manager = selectSet.getManager(); |
| 99 _selectSet = selectSet; | |
| 100 _state=STATE_UNDISPATCHED; | |
| 101 _onIdle=false; | |
| 102 _open=true; | |
| 103 _key = key; | |
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104 |
| 865 | 105 setCheckForIdle(true); |
| 106 } | |
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107 |
| 865 | 108 /* ------------------------------------------------------------ */ |
| 109 public SelectionKey getSelectionKey() | |
| 110 { | |
| 111 synchronized (this) | |
| 112 { | |
| 113 return _key; | |
| 114 } | |
| 115 } | |
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116 |
| 865 | 117 public SelectorManager getSelectManager() |
| 118 { | |
| 119 return _manager; | |
| 120 } | |
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121 |
| 865 | 122 public Connection getConnection() |
| 123 { | |
| 124 return _connection; | |
| 125 } | |
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126 |
| 865 | 127 public void setConnection(Connection connection) |
| 128 { | |
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129 _connection = (AsyncConnection)connection; |
| 865 | 130 } |
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131 |
| 865 | 132 /* ------------------------------------------------------------ */ |
| 133 /** Called by selectSet to schedule handling | |
| 134 * | |
| 135 */ | |
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136 public synchronized void schedule() |
| 865 | 137 { |
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138 // If there is no key, then do nothing |
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139 if (_key == null || !_key.isValid()) |
| 865 | 140 { |
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141 _readBlocked=false; |
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142 _writeBlocked=false; |
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143 this.notifyAll(); |
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144 return; |
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145 } |
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146 |
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147 // If there are threads dispatched reading and writing |
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148 if (_readBlocked || _writeBlocked) |
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149 { |
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150 // assert _dispatched; |
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151 if (_readBlocked && _key.isReadable()) |
| 865 | 152 _readBlocked=false; |
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153 if (_writeBlocked && _key.isWritable()) |
| 865 | 154 _writeBlocked=false; |
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155 |
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156 // wake them up is as good as a dispatched. |
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157 this.notifyAll(); |
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158 |
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159 // we are not interested in further selecting |
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160 _key.interestOps(0); |
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161 if (_state<STATE_DISPATCHED) |
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162 updateKey(); |
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163 return; |
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164 } |
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165 |
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166 // Remove writeable op |
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167 if ((_key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE && (_key.interestOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) |
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168 { |
| 865 | 169 // Remove writeable op |
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170 _interestOps = _key.interestOps() & ~SelectionKey.OP_WRITE; |
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171 _key.interestOps(_interestOps); |
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172 _writable = true; // Once writable is in ops, only removed with dispatch. |
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173 } |
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174 |
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175 // If dispatched, then deregister interest |
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176 if (_state>=STATE_DISPATCHED) |
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177 _key.interestOps(0); |
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178 else |
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179 { |
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180 // other wise do the dispatch |
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181 dispatch(); |
| 865 | 182 } |
| 183 } | |
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184 |
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185 public synchronized void dispatch() |
| 865 | 186 { |
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187 if (_state<=STATE_UNDISPATCHED) |
| 865 | 188 { |
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189 if (_onIdle) |
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190 _state = STATE_NEEDS_DISPATCH; |
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191 else |
| 865 | 192 { |
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193 _state = STATE_DISPATCHED; |
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194 try { |
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195 _manager.execute(_handler); |
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196 } catch(RejectedExecutionException e) { |
| 865 | 197 _state = STATE_NEEDS_DISPATCH; |
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198 LOG.warn("Dispatched Failed! "+this+" to "+_manager); |
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199 updateKey(); |
| 865 | 200 } |
| 201 } | |
| 202 } | |
| 203 } | |
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204 |
| 865 | 205 /* ------------------------------------------------------------ */ |
| 206 /** | |
| 207 * Called when a dispatched thread is no longer handling the endpoint. | |
| 208 * The selection key operations are updated. | |
| 209 * @return If false is returned, the endpoint has been redispatched and | |
| 210 * thread must keep handling the endpoint. | |
| 211 */ | |
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212 protected synchronized void undispatch() |
| 865 | 213 { |
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214 _state = STATE_UNDISPATCHED; |
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215 updateKey(); |
| 865 | 216 } |
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217 |
| 865 | 218 public void setCheckForIdle(boolean check) |
| 219 { | |
| 220 if (check) | |
| 221 { | |
| 222 _idleTimestamp=System.currentTimeMillis(); | |
| 223 _checkIdle=true; | |
| 224 } | |
| 225 else | |
| 226 _checkIdle=false; | |
| 227 } | |
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228 |
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229 private boolean isCheckForIdle() |
| 865 | 230 { |
| 231 return _checkIdle; | |
| 232 } | |
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233 |
| 865 | 234 protected void notIdle() |
| 235 { | |
| 236 _idleTimestamp=System.currentTimeMillis(); | |
| 237 } | |
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238 |
| 865 | 239 public void checkIdleTimestamp(long now) |
| 240 { | |
| 241 if (isCheckForIdle() && _maxIdleTime>0) | |
| 242 { | |
| 243 final long idleForMs=now-_idleTimestamp; | |
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244 |
| 865 | 245 if (idleForMs>_maxIdleTime) |
| 246 { | |
| 247 // Don't idle out again until onIdleExpired task completes. | |
| 248 setCheckForIdle(false); | |
| 249 _manager.execute(new Runnable() | |
| 250 { | |
| 251 public void run() | |
| 252 { | |
| 253 try | |
| 254 { | |
| 255 onIdleExpired(idleForMs); | |
| 256 } | |
| 257 finally | |
| 258 { | |
| 259 setCheckForIdle(true); | |
| 260 } | |
| 261 } | |
| 262 }); | |
| 263 } | |
| 264 } | |
| 265 } | |
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266 |
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267 private void onIdleExpired(long idleForMs) |
| 865 | 268 { |
| 269 try | |
| 270 { | |
| 271 synchronized (this) | |
| 272 { | |
| 273 _onIdle=true; | |
| 274 } | |
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275 |
| 865 | 276 _connection.onIdleExpired(idleForMs); |
| 277 } | |
| 278 finally | |
| 279 { | |
| 280 synchronized (this) | |
| 281 { | |
| 282 _onIdle=false; | |
| 283 if (_state==STATE_NEEDS_DISPATCH) | |
| 284 dispatch(); | |
| 285 } | |
| 286 } | |
| 287 } | |
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288 |
| 865 | 289 @Override |
| 290 public int fill(Buffer buffer) throws IOException | |
| 291 { | |
| 292 int fill=super.fill(buffer); | |
| 293 if (fill>0) | |
| 294 notIdle(); | |
| 295 return fill; | |
| 296 } | |
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297 |
| 865 | 298 @Override |
| 299 public int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException | |
| 300 { | |
| 301 int l = super.flush(header, buffer, trailer); | |
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302 |
| 865 | 303 // If there was something to write and it wasn't written, then we are not writable. |
| 304 if (l==0 && ( header!=null && header.hasContent() || buffer!=null && buffer.hasContent() || trailer!=null && trailer.hasContent())) | |
| 305 { | |
| 306 synchronized (this) | |
| 307 { | |
| 308 _writable=false; | |
| 309 if (_state<STATE_DISPATCHED) | |
| 310 updateKey(); | |
| 311 } | |
| 312 } | |
| 313 else if (l>0) | |
| 314 { | |
| 315 _writable=true; | |
| 316 notIdle(); | |
| 317 } | |
| 318 return l; | |
| 319 } | |
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320 |
| 865 | 321 @Override |
| 322 public int flush(Buffer buffer) throws IOException | |
| 323 { | |
| 324 int l = super.flush(buffer); | |
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325 |
| 865 | 326 // If there was something to write and it wasn't written, then we are not writable. |
| 327 if (l==0 && buffer!=null && buffer.hasContent()) | |
| 328 { | |
| 329 synchronized (this) | |
| 330 { | |
| 331 _writable=false; | |
| 332 if (_state<STATE_DISPATCHED) | |
| 333 updateKey(); | |
| 334 } | |
| 335 } | |
| 336 else if (l>0) | |
| 337 { | |
| 338 _writable=true; | |
| 339 notIdle(); | |
| 340 } | |
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341 |
| 865 | 342 return l; |
| 343 } | |
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344 |
| 865 | 345 /* ------------------------------------------------------------ */ |
| 346 /* | |
| 347 * Allows thread to block waiting for further events. | |
| 348 */ | |
| 349 @Override | |
| 350 public boolean blockReadable(long timeoutMs) throws IOException | |
| 351 { | |
| 352 synchronized (this) | |
| 353 { | |
| 354 if (isInputShutdown()) | |
| 355 throw new EofException(); | |
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356 |
| 865 | 357 long now=_selectSet.getNow(); |
| 358 long end=now+timeoutMs; | |
| 359 boolean check=isCheckForIdle(); | |
| 360 setCheckForIdle(true); | |
| 361 try | |
| 362 { | |
| 363 _readBlocked=true; | |
| 364 while (!isInputShutdown() && _readBlocked) | |
| 365 { | |
| 366 try | |
| 367 { | |
| 368 updateKey(); | |
| 369 this.wait(timeoutMs>0?(end-now):10000); | |
| 370 } | |
| 371 catch (final InterruptedException e) | |
| 372 { | |
| 373 LOG.warn("",e); | |
| 374 } | |
| 375 finally | |
| 376 { | |
| 377 now=_selectSet.getNow(); | |
| 378 } | |
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379 |
| 865 | 380 if (_readBlocked && timeoutMs>0 && now>=end) |
| 381 return false; | |
| 382 } | |
| 383 } | |
| 384 finally | |
| 385 { | |
| 386 _readBlocked=false; | |
| 387 setCheckForIdle(check); | |
| 388 } | |
| 389 } | |
| 390 return true; | |
| 391 } | |
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392 |
| 865 | 393 /* ------------------------------------------------------------ */ |
| 394 /* | |
| 395 * Allows thread to block waiting for further events. | |
| 396 */ | |
| 397 @Override | |
| 398 public boolean blockWritable(long timeoutMs) throws IOException | |
| 399 { | |
| 400 synchronized (this) | |
| 401 { | |
| 402 if (isOutputShutdown()) | |
| 403 throw new EofException(); | |
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404 |
| 865 | 405 long now=_selectSet.getNow(); |
| 406 long end=now+timeoutMs; | |
| 407 boolean check=isCheckForIdle(); | |
| 408 setCheckForIdle(true); | |
| 409 try | |
| 410 { | |
| 411 _writeBlocked=true; | |
| 412 while (_writeBlocked && !isOutputShutdown()) | |
| 413 { | |
| 414 try | |
| 415 { | |
| 416 updateKey(); | |
| 417 this.wait(timeoutMs>0?(end-now):10000); | |
| 418 } | |
| 419 catch (final InterruptedException e) | |
| 420 { | |
| 421 LOG.warn("",e); | |
| 422 } | |
| 423 finally | |
| 424 { | |
| 425 now=_selectSet.getNow(); | |
| 426 } | |
| 427 if (_writeBlocked && timeoutMs>0 && now>=end) | |
| 428 return false; | |
| 429 } | |
| 430 } | |
| 431 finally | |
| 432 { | |
| 433 _writeBlocked=false; | |
| 434 setCheckForIdle(check); | |
| 435 } | |
| 436 } | |
| 437 return true; | |
| 438 } | |
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439 |
| 865 | 440 public boolean hasProgressed() |
| 441 { | |
| 442 return false; | |
| 443 } | |
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444 |
| 865 | 445 /* ------------------------------------------------------------ */ |
| 446 /** | |
| 447 * Updates selection key. Adds operations types to the selection key as needed. No operations | |
| 448 * are removed as this is only done during dispatch. This method records the new key and | |
| 449 * schedules a call to doUpdateKey to do the keyChange | |
| 450 */ | |
| 451 private void updateKey() | |
| 452 { | |
| 453 final boolean changed; | |
| 454 synchronized (this) | |
| 455 { | |
| 456 int current_ops=-1; | |
| 457 if (getChannel().isOpen()) | |
| 458 { | |
| 459 boolean read_interest = _readBlocked || (_state<STATE_DISPATCHED && !_connection.isSuspended()); | |
| 460 boolean write_interest= _writeBlocked || (_state<STATE_DISPATCHED && !_writable); | |
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461 |
| 865 | 462 _interestOps = |
| 463 ((!_socket.isInputShutdown() && read_interest ) ? SelectionKey.OP_READ : 0) | |
| 464 | ((!_socket.isOutputShutdown()&& write_interest) ? SelectionKey.OP_WRITE : 0); | |
| 465 try | |
| 466 { | |
| 467 current_ops = ((_key!=null && _key.isValid())?_key.interestOps():-1); | |
| 468 } | |
| 469 catch(Exception e) | |
| 470 { | |
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471 _key = null; |
| 865 | 472 LOG.trace("",e); |
| 473 } | |
| 474 } | |
| 475 changed=_interestOps!=current_ops; | |
| 476 } | |
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477 |
| 865 | 478 if(changed) |
| 479 { | |
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480 doUpdateKey(); |
| 950 | 481 _selectSet.getSelector().update(); |
| 865 | 482 } |
| 483 } | |
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484 |
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485 |
| 865 | 486 /* ------------------------------------------------------------ */ |
| 487 /** | |
| 488 * Synchronize the interestOps with the actual key. Call is scheduled by a call to updateKey | |
| 489 */ | |
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490 synchronized void doUpdateKey() |
| 865 | 491 { |
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492 if (getChannel().isOpen()) |
| 865 | 493 { |
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494 if (_interestOps>0) |
| 865 | 495 { |
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496 if (_key==null || !_key.isValid()) |
| 865 | 497 { |
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498 SelectableChannel sc = (SelectableChannel)getChannel(); |
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499 if (sc.isRegistered()) |
| 865 | 500 { |
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501 updateKey(); |
| 865 | 502 } |
| 503 else | |
| 504 { | |
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505 try |
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506 { |
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507 _key = _selectSet.getSelector().register(sc,_interestOps,this); |
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508 } |
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509 catch (Exception e) |
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510 { |
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511 LOG.trace("",e); |
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512 if (_key!=null && _key.isValid()) |
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513 { |
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514 _key.cancel(); |
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515 } |
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516 |
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517 if (_open) |
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518 { |
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519 _selectSet.destroyEndPoint(this); |
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520 } |
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521 _open=false; |
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522 _key = null; |
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523 } |
| 865 | 524 } |
| 525 } | |
| 526 else | |
| 527 { | |
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528 _key.interestOps(_interestOps); |
| 865 | 529 } |
| 530 } | |
| 531 else | |
| 532 { | |
| 533 if (_key!=null && _key.isValid()) | |
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534 _key.interestOps(0); |
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535 else |
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536 _key = null; |
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537 } |
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538 } |
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539 else |
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540 { |
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541 if (_key!=null && _key.isValid()) |
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542 _key.cancel(); |
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543 |
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544 if (_open) |
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545 { |
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546 _open=false; |
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547 _selectSet.destroyEndPoint(this); |
| 865 | 548 } |
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549 _key = null; |
| 865 | 550 } |
| 551 } | |
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552 |
| 865 | 553 /* ------------------------------------------------------------ */ |
| 554 /* | |
| 555 */ | |
| 556 protected void handle() | |
| 557 { | |
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558 boolean dispatched = true; |
| 865 | 559 try |
| 560 { | |
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561 try |
| 865 | 562 { |
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563 while(true) |
| 865 | 564 { |
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565 final AsyncConnection next = (AsyncConnection)_connection.handle(); |
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566 if (next!=_connection) |
| 865 | 567 { |
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568 LOG.debug("{} replaced {}",next,_connection); |
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569 _connection=next; |
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570 continue; |
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571 } |
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572 break; |
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573 } |
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574 } |
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575 catch (ClosedChannelException e) |
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576 { |
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577 LOG.trace("",e); |
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578 } |
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579 catch (EofException e) |
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580 { |
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581 LOG.debug("EOF", e); |
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582 try{close();} |
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583 catch(IOException e2){LOG.trace("",e2);} |
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584 } |
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585 catch (IOException e) |
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586 { |
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587 LOG.warn(e.toString()); |
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588 try{close();} |
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589 catch(IOException e2){LOG.trace("",e2);} |
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590 } |
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591 catch (Throwable e) |
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592 { |
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593 LOG.warn("handle failed", e); |
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594 try{close();} |
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595 catch(IOException e2){LOG.trace("",e2);} |
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596 } |
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597 finally |
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598 { |
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599 if (!_ishut && isInputShutdown() && isOpen()) |
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600 { |
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601 _ishut = true; |
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602 try |
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603 { |
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604 _connection.onInputShutdown(); |
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605 } |
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606 catch(Throwable x) |
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607 { |
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608 LOG.warn("onInputShutdown failed", x); |
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609 try{close();} |
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610 catch(IOException e2){LOG.trace("",e2);} |
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611 } |
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612 finally |
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613 { |
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614 updateKey(); |
| 865 | 615 } |
| 616 } | |
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617 undispatch(); |
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618 dispatched = false; |
| 865 | 619 } |
| 620 } | |
| 621 finally | |
| 622 { | |
| 623 if (dispatched) | |
| 624 { | |
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625 undispatch(); |
| 865 | 626 } |
| 627 } | |
| 628 } | |
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629 |
| 865 | 630 /* ------------------------------------------------------------ */ |
| 631 /* | |
| 632 * @see org.eclipse.io.nio.ChannelEndPoint#close() | |
| 633 */ | |
| 634 @Override | |
| 635 public void close() throws IOException | |
| 636 { | |
| 637 try | |
| 638 { | |
| 639 super.close(); | |
| 640 } | |
| 641 catch (IOException e) | |
| 642 { | |
| 643 LOG.trace("",e); | |
| 644 } | |
| 645 finally | |
| 646 { | |
| 647 updateKey(); | |
| 648 } | |
| 649 } | |
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650 |
| 865 | 651 /* ------------------------------------------------------------ */ |
| 652 @Override | |
| 653 public String toString() | |
| 654 { | |
| 655 // Do NOT use synchronized (this) | |
| 656 // because it's very easy to deadlock when debugging is enabled. | |
| 657 // We do a best effort to print the right toString() and that's it. | |
| 658 SelectionKey key = _key; | |
| 659 String keyString = ""; | |
| 660 if (key != null) | |
| 661 { | |
| 662 if (key.isValid()) | |
| 663 { | |
| 664 if (key.isReadable()) | |
| 665 keyString += "r"; | |
| 666 if (key.isWritable()) | |
| 667 keyString += "w"; | |
| 668 } | |
| 669 else | |
| 670 { | |
| 671 keyString += "!"; | |
| 672 } | |
| 673 } | |
| 674 else | |
| 675 { | |
| 676 keyString += "-"; | |
| 677 } | |
| 678 return String.format("SCEP@%x{l(%s)<->r(%s),s=%d,open=%b,ishut=%b,oshut=%b,rb=%b,wb=%b,w=%b,i=%d%s}-{%s}", | |
| 679 hashCode(), | |
| 680 _socket.getRemoteSocketAddress(), | |
| 681 _socket.getLocalSocketAddress(), | |
| 682 _state, | |
| 683 isOpen(), | |
| 684 isInputShutdown(), | |
| 685 isOutputShutdown(), | |
| 686 _readBlocked, | |
| 687 _writeBlocked, | |
| 688 _writable, | |
| 689 _interestOps, | |
| 690 keyString, | |
| 691 _connection); | |
| 692 } | |
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693 |
| 865 | 694 /* ------------------------------------------------------------ */ |
| 695 /** | |
| 696 * Don't set the SoTimeout | |
| 697 * @see org.eclipse.jetty.io.nio.ChannelEndPoint#setMaxIdleTime(int) | |
| 698 */ | |
| 699 @Override | |
| 700 public void setMaxIdleTime(int timeMs) throws IOException | |
| 701 { | |
| 702 _maxIdleTime=timeMs; | |
| 703 } | |
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704 |
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705 } |