Mercurial Hosting > luan
annotate src/org/eclipse/jetty/io/nio/SelectChannelEndPoint.java @ 961:790c01734386
make SelectChannelEndPoint._key final
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 13 Oct 2016 22:03:24 -0600 |
parents | 3cd4c706a61f |
children | 94498d6daf5b |
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 final 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; | |
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50 private final SelectionKey _key; |
865 | 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 /** true if the last write operation succeed and wrote all offered bytes */ | |
73 private volatile boolean _writable = true; | |
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74 |
865 | 75 /** True if a thread has is blocked in {@link #blockReadable(long)} */ |
76 private boolean _readBlocked; | |
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77 |
865 | 78 /** True if a thread has is blocked in {@link #blockWritable(long)} */ |
79 private boolean _writeBlocked; | |
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80 |
865 | 81 private boolean _ishut; |
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82 |
865 | 83 public SelectChannelEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key, int maxIdleTime) |
84 throws IOException | |
85 { | |
86 super(channel, maxIdleTime); | |
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87 |
865 | 88 _manager = selectSet.getManager(); |
89 _selectSet = selectSet; | |
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90 _state = STATE_UNDISPATCHED; |
865 | 91 _key = key; |
92 } | |
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93 |
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94 @Override |
865 | 95 public Connection getConnection() |
96 { | |
97 return _connection; | |
98 } | |
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99 |
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100 @Override |
865 | 101 public void setConnection(Connection connection) |
102 { | |
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103 _connection = (AsyncConnection)connection; |
865 | 104 } |
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105 |
865 | 106 /* ------------------------------------------------------------ */ |
107 /** Called by selectSet to schedule handling | |
108 * | |
109 */ | |
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110 public synchronized void schedule() |
865 | 111 { |
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112 // If there is no key, then do nothing |
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113 if (!_key.isValid()) |
865 | 114 { |
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115 _readBlocked = false; |
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116 _writeBlocked = false; |
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117 this.notifyAll(); |
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118 return; |
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119 } |
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120 |
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121 // If there are threads dispatched reading and writing |
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122 if (_readBlocked || _writeBlocked) |
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123 { |
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124 // assert _dispatched; |
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125 if (_readBlocked && _key.isReadable()) |
865 | 126 _readBlocked=false; |
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127 if (_writeBlocked && _key.isWritable()) |
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128 _writeBlocked = false; |
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129 |
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130 // wake them up is as good as a dispatched. |
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131 this.notifyAll(); |
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132 |
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133 // we are not interested in further selecting |
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134 _key.interestOps(0); |
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135 if (_state<STATE_DISPATCHED) |
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136 updateKey(); |
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137 return; |
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138 } |
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139 |
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140 // Remove writeable op |
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141 if ((_key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE && (_key.interestOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) |
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142 { |
865 | 143 // Remove writeable op |
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144 _interestOps = _key.interestOps() & ~SelectionKey.OP_WRITE; |
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145 _key.interestOps(_interestOps); |
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146 _writable = true; // Once writable is in ops, only removed with dispatch. |
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147 } |
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148 |
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149 // If dispatched, then deregister interest |
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150 if (_state>=STATE_DISPATCHED) |
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151 _key.interestOps(0); |
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152 else |
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153 { |
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154 // other wise do the dispatch |
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155 dispatch(); |
865 | 156 } |
157 } | |
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158 |
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159 @Override |
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160 public synchronized void dispatch() |
865 | 161 { |
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162 if (_state<=STATE_UNDISPATCHED) |
865 | 163 { |
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164 _state = STATE_DISPATCHED; |
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165 try { |
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166 _manager.execute(_handler); |
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167 } catch(RejectedExecutionException e) { |
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168 _state = STATE_NEEDS_DISPATCH; |
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169 LOG.warn("Dispatched Failed! "+this+" to "+_manager); |
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170 updateKey(); |
865 | 171 } |
172 } | |
173 } | |
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174 |
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175 @Override |
865 | 176 public int fill(Buffer buffer) throws IOException |
177 { | |
178 int fill=super.fill(buffer); | |
179 return fill; | |
180 } | |
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181 |
865 | 182 @Override |
183 public int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException | |
184 { | |
185 int l = super.flush(header, buffer, trailer); | |
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186 |
865 | 187 // If there was something to write and it wasn't written, then we are not writable. |
188 if (l==0 && ( header!=null && header.hasContent() || buffer!=null && buffer.hasContent() || trailer!=null && trailer.hasContent())) | |
189 { | |
190 synchronized (this) | |
191 { | |
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192 _writable = false; |
865 | 193 if (_state<STATE_DISPATCHED) |
194 updateKey(); | |
195 } | |
196 } | |
197 else if (l>0) | |
198 { | |
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199 _writable = true; |
865 | 200 } |
201 return l; | |
202 } | |
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203 |
865 | 204 @Override |
205 public int flush(Buffer buffer) throws IOException | |
206 { | |
207 int l = super.flush(buffer); | |
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208 |
865 | 209 // If there was something to write and it wasn't written, then we are not writable. |
210 if (l==0 && buffer!=null && buffer.hasContent()) | |
211 { | |
212 synchronized (this) | |
213 { | |
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214 _writable = false; |
865 | 215 if (_state<STATE_DISPATCHED) |
216 updateKey(); | |
217 } | |
218 } | |
219 else if (l>0) | |
220 { | |
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221 _writable = true; |
865 | 222 } |
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223 |
865 | 224 return l; |
225 } | |
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226 |
865 | 227 /* ------------------------------------------------------------ */ |
228 /* | |
229 * Allows thread to block waiting for further events. | |
230 */ | |
231 @Override | |
232 public boolean blockReadable(long timeoutMs) throws IOException | |
233 { | |
234 synchronized (this) | |
235 { | |
236 if (isInputShutdown()) | |
237 throw new EofException(); | |
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238 |
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239 long now = _selectSet.getNow(); |
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240 long end = now+timeoutMs; |
865 | 241 try |
242 { | |
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243 _readBlocked = true; |
865 | 244 while (!isInputShutdown() && _readBlocked) |
245 { | |
246 try | |
247 { | |
248 updateKey(); | |
249 this.wait(timeoutMs>0?(end-now):10000); | |
250 } | |
251 catch (final InterruptedException e) | |
252 { | |
253 LOG.warn("",e); | |
254 } | |
255 finally | |
256 { | |
257 now=_selectSet.getNow(); | |
258 } | |
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259 |
865 | 260 if (_readBlocked && timeoutMs>0 && now>=end) |
261 return false; | |
262 } | |
263 } | |
264 finally | |
265 { | |
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266 _readBlocked = false; |
865 | 267 } |
268 } | |
269 return true; | |
270 } | |
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271 |
865 | 272 /* ------------------------------------------------------------ */ |
273 /* | |
274 * Allows thread to block waiting for further events. | |
275 */ | |
276 @Override | |
277 public boolean blockWritable(long timeoutMs) throws IOException | |
278 { | |
279 synchronized (this) | |
280 { | |
281 if (isOutputShutdown()) | |
282 throw new EofException(); | |
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283 |
865 | 284 long now=_selectSet.getNow(); |
285 long end=now+timeoutMs; | |
286 try | |
287 { | |
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288 _writeBlocked = true; |
865 | 289 while (_writeBlocked && !isOutputShutdown()) |
290 { | |
291 try | |
292 { | |
293 updateKey(); | |
294 this.wait(timeoutMs>0?(end-now):10000); | |
295 } | |
296 catch (final InterruptedException e) | |
297 { | |
298 LOG.warn("",e); | |
299 } | |
300 finally | |
301 { | |
302 now=_selectSet.getNow(); | |
303 } | |
304 if (_writeBlocked && timeoutMs>0 && now>=end) | |
305 return false; | |
306 } | |
307 } | |
308 finally | |
309 { | |
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310 _writeBlocked = false; |
865 | 311 } |
312 } | |
313 return true; | |
314 } | |
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315 |
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316 @Override |
865 | 317 public boolean hasProgressed() |
318 { | |
319 return false; | |
320 } | |
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321 |
865 | 322 /* ------------------------------------------------------------ */ |
323 /** | |
324 * Updates selection key. Adds operations types to the selection key as needed. No operations | |
325 * are removed as this is only done during dispatch. This method records the new key and | |
326 * schedules a call to doUpdateKey to do the keyChange | |
327 */ | |
328 private void updateKey() | |
329 { | |
330 final boolean changed; | |
331 synchronized (this) | |
332 { | |
333 int current_ops=-1; | |
334 if (getChannel().isOpen()) | |
335 { | |
336 boolean read_interest = _readBlocked || (_state<STATE_DISPATCHED && !_connection.isSuspended()); | |
337 boolean write_interest= _writeBlocked || (_state<STATE_DISPATCHED && !_writable); | |
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338 |
865 | 339 _interestOps = |
340 ((!_socket.isInputShutdown() && read_interest ) ? SelectionKey.OP_READ : 0) | |
341 | ((!_socket.isOutputShutdown()&& write_interest) ? SelectionKey.OP_WRITE : 0); | |
342 try | |
343 { | |
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344 current_ops = ((_key.isValid())?_key.interestOps():-1); |
865 | 345 } |
346 catch(Exception e) | |
347 { | |
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348 _key.cancel(); |
865 | 349 LOG.trace("",e); |
350 } | |
351 } | |
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352 changed = _interestOps!=current_ops; |
865 | 353 } |
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354 |
865 | 355 if(changed) |
356 { | |
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357 doUpdateKey(); |
950 | 358 _selectSet.getSelector().update(); |
865 | 359 } |
360 } | |
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361 |
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362 |
865 | 363 /* ------------------------------------------------------------ */ |
364 /** | |
365 * Synchronize the interestOps with the actual key. Call is scheduled by a call to updateKey | |
366 */ | |
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367 synchronized void doUpdateKey() |
865 | 368 { |
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369 if (getChannel().isOpen()) |
865 | 370 { |
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371 _key.interestOps(_interestOps); |
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372 } |
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373 else |
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374 { |
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375 _key.cancel(); |
865 | 376 } |
377 } | |
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378 |
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379 private void handle() |
865 | 380 { |
381 try | |
382 { | |
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383 try |
865 | 384 { |
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385 while(true) |
865 | 386 { |
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387 final AsyncConnection next = (AsyncConnection)_connection.handle(); |
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388 if (next==_connection) |
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389 break; |
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390 LOG.debug("{} replaced {}",next,_connection); |
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391 _connection=next; |
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392 } |
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393 } |
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394 catch (ClosedChannelException e) |
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395 { |
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396 LOG.trace("",e); |
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397 } |
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398 catch (EofException e) |
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399 { |
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400 LOG.debug("EOF", e); |
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401 try{close();} |
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402 catch(IOException e2){LOG.trace("",e2);} |
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403 } |
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404 catch (IOException e) |
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405 { |
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406 LOG.warn(e.toString()); |
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407 try{close();} |
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408 catch(IOException e2){LOG.trace("",e2);} |
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409 } |
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410 catch (Throwable e) |
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411 { |
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412 LOG.warn("handle failed", e); |
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413 try{close();} |
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414 catch(IOException e2){LOG.trace("",e2);} |
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415 } |
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416 finally |
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417 { |
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418 if (!_ishut && isInputShutdown() && isOpen()) |
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419 { |
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420 _ishut = true; |
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421 try |
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422 { |
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423 _connection.onInputShutdown(); |
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424 } |
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425 catch(Throwable x) |
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426 { |
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427 LOG.warn("onInputShutdown failed", x); |
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428 try{close();} |
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429 catch(IOException e2){LOG.trace("",e2);} |
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430 } |
865 | 431 } |
432 } | |
433 } | |
434 finally | |
435 { | |
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436 _state = STATE_UNDISPATCHED; |
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437 updateKey(); |
865 | 438 } |
439 } | |
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440 |
865 | 441 /* ------------------------------------------------------------ */ |
442 /* | |
443 * @see org.eclipse.io.nio.ChannelEndPoint#close() | |
444 */ | |
445 @Override | |
446 public void close() throws IOException | |
447 { | |
448 try | |
449 { | |
450 super.close(); | |
451 } | |
452 catch (IOException e) | |
453 { | |
454 LOG.trace("",e); | |
455 } | |
456 finally | |
457 { | |
458 updateKey(); | |
459 } | |
460 } | |
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461 |
865 | 462 @Override |
463 public String toString() | |
464 { | |
465 // Do NOT use synchronized (this) | |
466 // because it's very easy to deadlock when debugging is enabled. | |
467 // We do a best effort to print the right toString() and that's it. | |
468 SelectionKey key = _key; | |
469 String keyString = ""; | |
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470 if (key.isValid()) |
865 | 471 { |
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472 if (key.isReadable()) |
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473 keyString += "r"; |
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474 if (key.isWritable()) |
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475 keyString += "w"; |
865 | 476 } |
477 else | |
478 { | |
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479 keyString += "!"; |
865 | 480 } |
481 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}", | |
482 hashCode(), | |
483 _socket.getRemoteSocketAddress(), | |
484 _socket.getLocalSocketAddress(), | |
485 _state, | |
486 isOpen(), | |
487 isInputShutdown(), | |
488 isOutputShutdown(), | |
489 _readBlocked, | |
490 _writeBlocked, | |
491 _writable, | |
492 _interestOps, | |
493 keyString, | |
494 _connection); | |
495 } | |
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496 |
865 | 497 /* ------------------------------------------------------------ */ |
498 /** | |
499 * Don't set the SoTimeout | |
500 * @see org.eclipse.jetty.io.nio.ChannelEndPoint#setMaxIdleTime(int) | |
501 */ | |
502 @Override | |
503 public void setMaxIdleTime(int timeMs) throws IOException | |
504 { | |
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505 _maxIdleTime = timeMs; |
865 | 506 } |
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507 |
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508 } |