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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 889:5731a7707466
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| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Thu, 06 Oct 2016 23:24:30 -0600 |
| parents | 6b210bb66c63 |
| children | 54308d65265a |
| 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.nio.channels.CancelledKeyException; |
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23 import java.nio.channels.Channel; |
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24 import java.nio.channels.ClosedSelectorException; |
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25 import java.nio.channels.SelectableChannel; |
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26 import java.nio.channels.SelectionKey; |
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27 import java.nio.channels.Selector; |
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28 import java.nio.channels.ServerSocketChannel; |
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29 import java.nio.channels.SocketChannel; |
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30 import java.util.ArrayList; |
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31 import java.util.List; |
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32 import java.util.Set; |
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33 import java.util.concurrent.ConcurrentHashMap; |
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34 import java.util.concurrent.ConcurrentLinkedQueue; |
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35 import java.util.concurrent.ConcurrentMap; |
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36 import java.util.concurrent.CountDownLatch; |
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37 import java.util.concurrent.TimeUnit; |
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38 |
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39 import org.eclipse.jetty.io.AsyncEndPoint; |
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40 import org.eclipse.jetty.io.ConnectedEndPoint; |
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41 import org.eclipse.jetty.io.Connection; |
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42 import org.eclipse.jetty.io.EndPoint; |
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43 import org.eclipse.jetty.util.TypeUtil; |
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44 import org.eclipse.jetty.util.component.AbstractLifeCycle; |
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45 import org.eclipse.jetty.util.component.AggregateLifeCycle; |
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46 import org.eclipse.jetty.util.component.Dumpable; |
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47 import org.slf4j.Logger; |
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48 import org.slf4j.LoggerFactory; |
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49 import org.eclipse.jetty.util.thread.Timeout; |
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50 import org.eclipse.jetty.util.thread.Timeout.Task; |
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51 |
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52 |
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53 /* ------------------------------------------------------------ */ |
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54 /** |
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55 * The Selector Manager manages and number of SelectSets to allow |
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56 * NIO scheduling to scale to large numbers of connections. |
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57 * <p> |
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58 */ |
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59 public abstract class SelectorManager extends AbstractLifeCycle implements Dumpable |
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60 { |
| 865 | 61 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio"); |
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62 |
| 865 | 63 private static final int __MONITOR_PERIOD=Integer.getInteger("org.eclipse.jetty.io.nio.MONITOR_PERIOD",1000).intValue(); |
| 64 private static final int __MAX_SELECTS=Integer.getInteger("org.eclipse.jetty.io.nio.MAX_SELECTS",100000).intValue(); | |
| 65 private static final int __BUSY_PAUSE=Integer.getInteger("org.eclipse.jetty.io.nio.BUSY_PAUSE",50).intValue(); | |
| 66 private static final int __IDLE_TICK=Integer.getInteger("org.eclipse.jetty.io.nio.IDLE_TICK",400).intValue(); | |
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67 |
| 865 | 68 private int _maxIdleTime; |
| 69 private int _lowResourcesMaxIdleTime; | |
| 70 private long _lowResourcesConnections; | |
| 71 private SelectSet[] _selectSet; | |
| 72 private int _selectSets=1; | |
| 73 private volatile int _set=0; | |
| 74 private boolean _deferringInterestedOps0=true; | |
| 75 private int _selectorPriorityDelta=0; | |
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76 |
| 865 | 77 /* ------------------------------------------------------------ */ |
| 78 /** | |
| 79 * @param maxIdleTime The maximum period in milli seconds that a connection may be idle before it is closed. | |
| 80 * @see #setLowResourcesMaxIdleTime(long) | |
| 81 */ | |
| 82 public void setMaxIdleTime(long maxIdleTime) | |
| 83 { | |
| 84 _maxIdleTime=(int)maxIdleTime; | |
| 85 } | |
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86 |
| 865 | 87 /* ------------------------------------------------------------ */ |
| 88 /** | |
| 89 * @param selectSets number of select sets to create | |
| 90 */ | |
| 91 public void setSelectSets(int selectSets) | |
| 92 { | |
| 93 long lrc = _lowResourcesConnections * _selectSets; | |
| 94 _selectSets=selectSets; | |
| 95 _lowResourcesConnections=lrc/_selectSets; | |
| 96 } | |
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97 |
| 865 | 98 /* ------------------------------------------------------------ */ |
| 99 /** | |
| 100 * @return the max idle time | |
| 101 */ | |
| 102 public long getMaxIdleTime() | |
| 103 { | |
| 104 return _maxIdleTime; | |
| 105 } | |
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106 |
| 865 | 107 /* ------------------------------------------------------------ */ |
| 108 /** | |
| 109 * @return the number of select sets in use | |
| 110 */ | |
| 111 public int getSelectSets() | |
| 112 { | |
| 113 return _selectSets; | |
| 114 } | |
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115 |
| 865 | 116 /* ------------------------------------------------------------ */ |
| 117 /** | |
| 118 * @param i | |
| 119 * @return The select set | |
| 120 */ | |
| 121 public SelectSet getSelectSet(int i) | |
| 122 { | |
| 123 return _selectSet[i]; | |
| 124 } | |
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125 |
| 865 | 126 /* ------------------------------------------------------------ */ |
| 127 /** Register a channel | |
| 128 * @param channel | |
| 129 * @param att Attached Object | |
| 130 */ | |
| 131 public void register(SocketChannel channel, Object att) | |
| 132 { | |
| 133 // The ++ increment here is not atomic, but it does not matter. | |
| 134 // so long as the value changes sometimes, then connections will | |
| 135 // be distributed over the available sets. | |
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136 |
| 865 | 137 int s=_set++; |
| 138 if (s<0) | |
| 139 s=-s; | |
| 140 s=s%_selectSets; | |
| 141 SelectSet[] sets=_selectSet; | |
| 142 if (sets!=null) | |
| 143 { | |
| 144 SelectSet set=sets[s]; | |
| 145 set.addChange(channel,att); | |
| 146 set.wakeup(); | |
| 147 } | |
| 148 } | |
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149 |
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150 |
| 865 | 151 /* ------------------------------------------------------------ */ |
| 152 /** Register a channel | |
| 153 * @param channel | |
| 154 */ | |
| 155 public void register(SocketChannel channel) | |
| 156 { | |
| 157 // The ++ increment here is not atomic, but it does not matter. | |
| 158 // so long as the value changes sometimes, then connections will | |
| 159 // be distributed over the available sets. | |
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160 |
| 865 | 161 int s=_set++; |
| 162 if (s<0) | |
| 163 s=-s; | |
| 164 s=s%_selectSets; | |
| 165 SelectSet[] sets=_selectSet; | |
| 166 if (sets!=null) | |
| 167 { | |
| 168 SelectSet set=sets[s]; | |
| 169 set.addChange(channel); | |
| 170 set.wakeup(); | |
| 171 } | |
| 172 } | |
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173 |
| 865 | 174 /* ------------------------------------------------------------ */ |
| 175 /** Register a {@link ServerSocketChannel} | |
| 176 * @param acceptChannel | |
| 177 */ | |
| 178 public void register(ServerSocketChannel acceptChannel) | |
| 179 { | |
| 180 int s=_set++; | |
| 181 if (s<0) | |
| 182 s=-s; | |
| 183 s=s%_selectSets; | |
| 184 SelectSet set=_selectSet[s]; | |
| 185 set.addChange(acceptChannel); | |
| 186 set.wakeup(); | |
| 187 } | |
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188 |
| 865 | 189 /* ------------------------------------------------------------ */ |
| 190 /** | |
| 191 * @return delta The value to add to the selector thread priority. | |
| 192 */ | |
| 193 public int getSelectorPriorityDelta() | |
| 194 { | |
| 195 return _selectorPriorityDelta; | |
| 196 } | |
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197 |
| 865 | 198 /* ------------------------------------------------------------ */ |
| 199 /** Set the selector thread priorty delta. | |
| 200 * @param delta The value to add to the selector thread priority. | |
| 201 */ | |
| 202 public void setSelectorPriorityDelta(int delta) | |
| 203 { | |
| 204 _selectorPriorityDelta=delta; | |
| 205 } | |
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206 |
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207 |
| 865 | 208 /* ------------------------------------------------------------ */ |
| 209 /** | |
| 210 * @return the lowResourcesConnections | |
| 211 */ | |
| 212 public long getLowResourcesConnections() | |
| 213 { | |
| 214 return _lowResourcesConnections*_selectSets; | |
| 215 } | |
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216 |
| 865 | 217 /* ------------------------------------------------------------ */ |
| 218 /** | |
| 219 * Set the number of connections, which if exceeded places this manager in low resources state. | |
| 220 * This is not an exact measure as the connection count is averaged over the select sets. | |
| 221 * @param lowResourcesConnections the number of connections | |
| 222 * @see #setLowResourcesMaxIdleTime(long) | |
| 223 */ | |
| 224 public void setLowResourcesConnections(long lowResourcesConnections) | |
| 225 { | |
| 226 _lowResourcesConnections=(lowResourcesConnections+_selectSets-1)/_selectSets; | |
| 227 } | |
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228 |
| 865 | 229 /* ------------------------------------------------------------ */ |
| 230 /** | |
| 231 * @return the lowResourcesMaxIdleTime | |
| 232 */ | |
| 233 public long getLowResourcesMaxIdleTime() | |
| 234 { | |
| 235 return _lowResourcesMaxIdleTime; | |
| 236 } | |
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237 |
| 865 | 238 /* ------------------------------------------------------------ */ |
| 239 /** | |
| 240 * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when this SelectSet has more connections than {@link #getLowResourcesConnections()} | |
| 241 * @see #setMaxIdleTime(long) | |
| 242 */ | |
| 243 public void setLowResourcesMaxIdleTime(long lowResourcesMaxIdleTime) | |
| 244 { | |
| 245 _lowResourcesMaxIdleTime=(int)lowResourcesMaxIdleTime; | |
| 246 } | |
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247 |
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248 |
| 865 | 249 /* ------------------------------------------------------------------------------- */ |
| 250 public abstract void execute(Runnable task); | |
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251 |
| 865 | 252 /* ------------------------------------------------------------ */ |
| 253 /* (non-Javadoc) | |
| 254 * @see org.eclipse.component.AbstractLifeCycle#doStart() | |
| 255 */ | |
| 256 @Override | |
| 257 protected void doStart() throws Exception | |
| 258 { | |
| 259 _selectSet = new SelectSet[_selectSets]; | |
| 260 for (int i=0;i<_selectSet.length;i++) | |
| 261 _selectSet[i]= new SelectSet(i); | |
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262 |
| 865 | 263 super.doStart(); |
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264 |
| 865 | 265 // start a thread to Select |
| 266 for (int i=0;i<getSelectSets();i++) | |
| 267 { | |
| 268 final int id=i; | |
| 269 execute(new Runnable() | |
| 270 { | |
| 271 public void run() | |
| 272 { | |
| 273 String name=Thread.currentThread().getName(); | |
| 274 int priority=Thread.currentThread().getPriority(); | |
| 275 try | |
| 276 { | |
| 277 SelectSet[] sets=_selectSet; | |
| 278 if (sets==null) | |
| 279 return; | |
| 280 SelectSet set=sets[id]; | |
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281 |
| 865 | 282 Thread.currentThread().setName(name+" Selector"+id); |
| 283 if (getSelectorPriorityDelta()!=0) | |
| 284 Thread.currentThread().setPriority(Thread.currentThread().getPriority()+getSelectorPriorityDelta()); | |
| 285 LOG.debug("Starting {} on {}",Thread.currentThread(),this); | |
| 286 while (isRunning()) | |
| 287 { | |
| 288 try | |
| 289 { | |
| 290 set.doSelect(); | |
| 291 } | |
| 292 catch(IOException e) | |
| 293 { | |
| 294 LOG.trace("",e); | |
| 295 } | |
| 296 catch(Exception e) | |
| 297 { | |
| 298 LOG.warn("",e); | |
| 299 } | |
| 300 } | |
| 301 } | |
| 302 finally | |
| 303 { | |
| 304 LOG.debug("Stopped {} on {}",Thread.currentThread(),this); | |
| 305 Thread.currentThread().setName(name); | |
| 306 if (getSelectorPriorityDelta()!=0) | |
| 307 Thread.currentThread().setPriority(priority); | |
| 308 } | |
| 309 } | |
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310 |
| 865 | 311 }); |
| 312 } | |
| 313 } | |
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314 |
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315 |
| 865 | 316 /* ------------------------------------------------------------------------------- */ |
| 317 @Override | |
| 318 protected void doStop() throws Exception | |
| 319 { | |
| 320 SelectSet[] sets= _selectSet; | |
| 321 _selectSet=null; | |
| 322 if (sets!=null) | |
| 323 { | |
| 324 for (SelectSet set : sets) | |
| 325 { | |
| 326 if (set!=null) | |
| 327 set.stop(); | |
| 328 } | |
| 329 } | |
| 330 super.doStop(); | |
| 331 } | |
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332 |
| 865 | 333 /* ------------------------------------------------------------ */ |
| 334 /** | |
| 335 * @param endpoint | |
| 336 */ | |
| 337 protected abstract void endPointClosed(SelectChannelEndPoint endpoint); | |
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338 |
| 865 | 339 /* ------------------------------------------------------------ */ |
| 340 /** | |
| 341 * @param endpoint | |
| 342 */ | |
| 343 protected abstract void endPointOpened(SelectChannelEndPoint endpoint); | |
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344 |
| 865 | 345 /* ------------------------------------------------------------ */ |
| 346 protected abstract void endPointUpgraded(ConnectedEndPoint endpoint,Connection oldConnection); | |
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347 |
| 865 | 348 /* ------------------------------------------------------------------------------- */ |
| 349 public abstract AsyncConnection newConnection(SocketChannel channel, AsyncEndPoint endpoint, Object attachment); | |
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350 |
| 865 | 351 /* ------------------------------------------------------------ */ |
| 352 /** | |
| 353 * Create a new end point | |
| 354 * @param channel | |
| 355 * @param selectSet | |
| 356 * @param sKey the selection key | |
| 357 * @return the new endpoint {@link SelectChannelEndPoint} | |
| 358 * @throws IOException | |
| 359 */ | |
| 360 protected abstract SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectorManager.SelectSet selectSet, SelectionKey sKey) throws IOException; | |
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361 |
| 865 | 362 /* ------------------------------------------------------------------------------- */ |
| 363 protected void connectionFailed(SocketChannel channel,Throwable ex,Object attachment) | |
| 364 { | |
| 365 LOG.warn(ex+","+channel+","+attachment); | |
| 366 LOG.debug("",ex); | |
| 367 } | |
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368 |
| 865 | 369 /* ------------------------------------------------------------ */ |
| 370 public String dump() | |
| 371 { | |
| 372 return AggregateLifeCycle.dump(this); | |
| 373 } | |
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374 |
| 865 | 375 /* ------------------------------------------------------------ */ |
| 376 public void dump(Appendable out, String indent) throws IOException | |
| 377 { | |
| 378 AggregateLifeCycle.dumpObject(out,this); | |
| 379 AggregateLifeCycle.dump(out,indent,TypeUtil.asList(_selectSet)); | |
| 380 } | |
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381 |
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382 |
| 865 | 383 /* ------------------------------------------------------------------------------- */ |
| 384 /* ------------------------------------------------------------------------------- */ | |
| 385 /* ------------------------------------------------------------------------------- */ | |
| 386 public class SelectSet implements Dumpable | |
| 387 { | |
| 388 private final int _setID; | |
| 389 private final Timeout _timeout; | |
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390 |
| 865 | 391 private final ConcurrentLinkedQueue<Object> _changes = new ConcurrentLinkedQueue<Object>(); |
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392 |
| 865 | 393 private volatile Selector _selector; |
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394 |
| 865 | 395 private volatile Thread _selecting; |
| 396 private int _busySelects; | |
| 397 private long _monitorNext; | |
| 398 private boolean _pausing; | |
| 399 private boolean _paused; | |
| 400 private volatile long _idleTick; | |
| 401 private ConcurrentMap<SelectChannelEndPoint,Object> _endPoints = new ConcurrentHashMap<SelectChannelEndPoint, Object>(); | |
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402 |
| 865 | 403 /* ------------------------------------------------------------ */ |
| 404 SelectSet(int acceptorID) throws Exception | |
| 405 { | |
| 406 _setID=acceptorID; | |
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407 |
| 865 | 408 _idleTick = System.currentTimeMillis(); |
| 409 _timeout = new Timeout(this); | |
| 410 _timeout.setDuration(0L); | |
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411 |
| 865 | 412 // create a selector; |
| 413 _selector = Selector.open(); | |
| 414 _monitorNext=System.currentTimeMillis()+__MONITOR_PERIOD; | |
| 415 } | |
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416 |
| 865 | 417 /* ------------------------------------------------------------ */ |
| 418 public void addChange(Object change) | |
| 419 { | |
| 420 _changes.add(change); | |
| 421 } | |
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422 |
| 865 | 423 /* ------------------------------------------------------------ */ |
| 424 public void addChange(SelectableChannel channel, Object att) | |
| 425 { | |
| 426 if (att==null) | |
| 427 addChange(channel); | |
| 428 else if (att instanceof EndPoint) | |
| 429 addChange(att); | |
| 430 else | |
| 431 addChange(new ChannelAndAttachment(channel,att)); | |
| 432 } | |
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433 |
| 865 | 434 /* ------------------------------------------------------------ */ |
| 435 /** | |
| 436 * Select and dispatch tasks found from changes and the selector. | |
| 437 * | |
| 438 * @throws IOException | |
| 439 */ | |
| 440 public void doSelect() throws IOException | |
| 441 { | |
| 442 try | |
| 443 { | |
| 444 _selecting=Thread.currentThread(); | |
| 445 final Selector selector=_selector; | |
| 446 // Stopped concurrently ? | |
| 447 if (selector == null) | |
| 448 return; | |
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449 |
| 865 | 450 // Make any key changes required |
| 451 Object change; | |
| 452 int changes=_changes.size(); | |
| 453 while (changes-->0 && (change=_changes.poll())!=null) | |
| 454 { | |
| 455 Channel ch=null; | |
| 456 SelectionKey key=null; | |
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457 |
| 865 | 458 try |
| 459 { | |
| 460 if (change instanceof EndPoint) | |
| 461 { | |
| 462 // Update the operations for a key. | |
| 463 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)change; | |
| 464 ch=endpoint.getChannel(); | |
| 465 endpoint.doUpdateKey(); | |
| 466 } | |
| 467 else if (change instanceof ChannelAndAttachment) | |
| 468 { | |
| 469 // finish accepting/connecting this connection | |
| 470 final ChannelAndAttachment asc = (ChannelAndAttachment)change; | |
| 471 final SelectableChannel channel=asc._channel; | |
| 472 ch=channel; | |
| 473 final Object att = asc._attachment; | |
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474 |
| 865 | 475 if ((channel instanceof SocketChannel) && ((SocketChannel)channel).isConnected()) |
| 476 { | |
| 477 key = channel.register(selector,SelectionKey.OP_READ,att); | |
| 478 SelectChannelEndPoint endpoint = createEndPoint((SocketChannel)channel,key); | |
| 479 key.attach(endpoint); | |
| 480 endpoint.schedule(); | |
| 481 } | |
| 482 else if (channel.isOpen()) | |
| 483 { | |
| 484 key = channel.register(selector,SelectionKey.OP_CONNECT,att); | |
| 485 } | |
| 486 } | |
| 487 else if (change instanceof SocketChannel) | |
| 488 { | |
| 489 // Newly registered channel | |
| 490 final SocketChannel channel=(SocketChannel)change; | |
| 491 ch=channel; | |
| 492 key = channel.register(selector,SelectionKey.OP_READ,null); | |
| 493 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 494 key.attach(endpoint); | |
| 495 endpoint.schedule(); | |
| 496 } | |
| 497 else if (change instanceof ChangeTask) | |
| 498 { | |
| 499 ((Runnable)change).run(); | |
| 500 } | |
| 501 else if (change instanceof Runnable) | |
| 502 { | |
| 503 execute((Runnable)change); | |
| 504 } | |
| 505 else | |
| 506 throw new IllegalArgumentException(change.toString()); | |
| 507 } | |
| 508 catch (CancelledKeyException e) | |
| 509 { | |
| 510 LOG.trace("",e); | |
| 511 } | |
| 512 catch (Throwable e) | |
| 513 { | |
| 514 if (isRunning()) | |
| 515 LOG.warn("",e); | |
| 516 else | |
| 517 LOG.debug("",e); | |
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518 |
| 865 | 519 try |
| 520 { | |
| 521 if (ch!=null) | |
| 522 ch.close(); | |
| 523 } | |
| 524 catch(IOException e2) | |
| 525 { | |
| 526 LOG.debug("",e2); | |
| 527 } | |
| 528 } | |
| 529 } | |
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530 |
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531 |
| 865 | 532 // Do and instant select to see if any connections can be handled. |
| 533 int selected=selector.selectNow(); | |
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534 |
| 865 | 535 long now=System.currentTimeMillis(); |
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536 |
| 865 | 537 // if no immediate things to do |
| 538 if (selected==0 && selector.selectedKeys().isEmpty()) | |
| 539 { | |
| 540 // If we are in pausing mode | |
| 541 if (_pausing) | |
| 542 { | |
| 543 try | |
| 544 { | |
| 545 Thread.sleep(__BUSY_PAUSE); // pause to reduce impact of busy loop | |
| 546 } | |
| 547 catch(InterruptedException e) | |
| 548 { | |
| 549 LOG.trace("",e); | |
| 550 } | |
| 551 now=System.currentTimeMillis(); | |
| 552 } | |
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553 |
| 865 | 554 // workout how long to wait in select |
| 555 _timeout.setNow(now); | |
| 556 long to_next_timeout=_timeout.getTimeToNext(); | |
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557 |
| 865 | 558 long wait = _changes.size()==0?__IDLE_TICK:0L; |
| 559 if (wait > 0 && to_next_timeout >= 0 && wait > to_next_timeout) | |
| 560 wait = to_next_timeout; | |
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561 |
| 865 | 562 // If we should wait with a select |
| 563 if (wait>0) | |
| 564 { | |
| 565 long before=now; | |
| 566 selector.select(wait); | |
| 567 now = System.currentTimeMillis(); | |
| 568 _timeout.setNow(now); | |
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569 |
| 865 | 570 // If we are monitoring for busy selector |
| 571 // and this select did not wait more than 1ms | |
| 572 if (__MONITOR_PERIOD>0 && now-before <=1) | |
| 573 { | |
| 574 // count this as a busy select and if there have been too many this monitor cycle | |
| 575 if (++_busySelects>__MAX_SELECTS) | |
| 576 { | |
| 577 // Start injecting pauses | |
| 578 _pausing=true; | |
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579 |
| 865 | 580 // if this is the first pause |
| 581 if (!_paused) | |
| 582 { | |
| 583 // Log and dump some status | |
| 584 _paused=true; | |
| 585 LOG.warn("Selector {} is too busy, pausing!",this); | |
| 586 } | |
| 587 } | |
| 588 } | |
| 589 } | |
| 590 } | |
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591 |
| 865 | 592 // have we been destroyed while sleeping |
| 593 if (_selector==null || !selector.isOpen()) | |
| 594 return; | |
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595 |
| 865 | 596 // Look for things to do |
| 597 for (SelectionKey key: selector.selectedKeys()) | |
| 598 { | |
| 599 SocketChannel channel=null; | |
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600 |
| 865 | 601 try |
| 602 { | |
| 603 if (!key.isValid()) | |
| 604 { | |
| 605 key.cancel(); | |
| 606 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); | |
| 607 if (endpoint != null) | |
| 608 endpoint.doUpdateKey(); | |
| 609 continue; | |
| 610 } | |
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611 |
| 865 | 612 Object att = key.attachment(); |
| 613 if (att instanceof SelectChannelEndPoint) | |
| 614 { | |
| 615 if (key.isReadable()||key.isWritable()) | |
| 616 ((SelectChannelEndPoint)att).schedule(); | |
| 617 } | |
| 618 else if (key.isConnectable()) | |
| 619 { | |
| 620 // Complete a connection of a registered channel | |
| 621 channel = (SocketChannel)key.channel(); | |
| 622 boolean connected=false; | |
| 623 try | |
| 624 { | |
| 625 connected=channel.finishConnect(); | |
| 626 } | |
| 627 catch(Exception e) | |
| 628 { | |
| 629 connectionFailed(channel,e,att); | |
| 630 } | |
| 631 finally | |
| 632 { | |
| 633 if (connected) | |
| 634 { | |
| 635 key.interestOps(SelectionKey.OP_READ); | |
| 636 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 637 key.attach(endpoint); | |
| 638 endpoint.schedule(); | |
| 639 } | |
| 640 else | |
| 641 { | |
| 642 key.cancel(); | |
| 643 channel.close(); | |
| 644 } | |
| 645 } | |
| 646 } | |
| 647 else | |
| 648 { | |
| 649 // Wrap readable registered channel in an endpoint | |
| 650 channel = (SocketChannel)key.channel(); | |
| 651 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 652 key.attach(endpoint); | |
| 653 if (key.isReadable()) | |
| 654 endpoint.schedule(); | |
| 655 } | |
| 656 key = null; | |
| 657 } | |
| 658 catch (CancelledKeyException e) | |
| 659 { | |
| 660 LOG.trace("",e); | |
| 661 } | |
| 662 catch (Exception e) | |
| 663 { | |
| 664 if (isRunning()) | |
| 665 LOG.warn("",e); | |
| 666 else | |
| 667 LOG.trace("",e); | |
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668 |
| 865 | 669 try |
| 670 { | |
| 671 if (channel!=null) | |
| 672 channel.close(); | |
| 673 } | |
| 674 catch(IOException e2) | |
| 675 { | |
| 676 LOG.debug("",e2); | |
| 677 } | |
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678 |
| 865 | 679 if (key != null && !(key.channel() instanceof ServerSocketChannel) && key.isValid()) |
| 680 key.cancel(); | |
| 681 } | |
| 682 } | |
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683 |
| 865 | 684 // Everything always handled |
| 685 selector.selectedKeys().clear(); | |
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686 |
| 865 | 687 now=System.currentTimeMillis(); |
| 688 _timeout.setNow(now); | |
| 689 Task task = _timeout.expired(); | |
| 690 while (task!=null) | |
| 691 { | |
| 692 if (task instanceof Runnable) | |
| 693 execute((Runnable)task); | |
| 694 task = _timeout.expired(); | |
| 695 } | |
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696 |
| 865 | 697 // Idle tick |
| 698 if (now-_idleTick>__IDLE_TICK) | |
| 699 { | |
| 700 _idleTick=now; | |
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701 |
| 865 | 702 final long idle_now=((_lowResourcesConnections>0 && selector.keys().size()>_lowResourcesConnections)) |
| 703 ?(now+_maxIdleTime-_lowResourcesMaxIdleTime) | |
| 704 :now; | |
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705 |
| 865 | 706 execute(new Runnable() |
| 707 { | |
| 708 public void run() | |
| 709 { | |
| 710 for (SelectChannelEndPoint endp:_endPoints.keySet()) | |
| 711 { | |
| 712 endp.checkIdleTimestamp(idle_now); | |
| 713 } | |
| 714 } | |
| 715 public String toString() {return "Idle-"+super.toString();} | |
| 716 }); | |
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717 |
| 865 | 718 } |
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719 |
| 865 | 720 // Reset busy select monitor counts |
| 721 if (__MONITOR_PERIOD>0 && now>_monitorNext) | |
| 722 { | |
| 723 _busySelects=0; | |
| 724 _pausing=false; | |
| 725 _monitorNext=now+__MONITOR_PERIOD; | |
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726 |
| 865 | 727 } |
| 728 } | |
| 729 catch (ClosedSelectorException e) | |
| 730 { | |
| 731 if (isRunning()) | |
| 732 LOG.warn("",e); | |
| 733 else | |
| 734 LOG.trace("",e); | |
| 735 } | |
| 736 catch (CancelledKeyException e) | |
| 737 { | |
| 738 LOG.trace("",e); | |
| 739 } | |
| 740 finally | |
| 741 { | |
| 742 _selecting=null; | |
| 743 } | |
| 744 } | |
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745 |
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746 |
| 865 | 747 /* ------------------------------------------------------------ */ |
| 748 private void renewSelector() | |
| 749 { | |
| 750 try | |
| 751 { | |
| 752 synchronized (this) | |
| 753 { | |
| 754 Selector selector=_selector; | |
| 755 if (selector==null) | |
| 756 return; | |
| 757 final Selector new_selector = Selector.open(); | |
| 758 for (SelectionKey k: selector.keys()) | |
| 759 { | |
| 760 if (!k.isValid() || k.interestOps()==0) | |
| 761 continue; | |
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762 |
| 865 | 763 final SelectableChannel channel = k.channel(); |
| 764 final Object attachment = k.attachment(); | |
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765 |
| 865 | 766 if (attachment==null) |
| 767 addChange(channel); | |
| 768 else | |
| 769 addChange(channel,attachment); | |
| 770 } | |
| 771 _selector.close(); | |
| 772 _selector=new_selector; | |
| 773 } | |
| 774 } | |
| 775 catch(IOException e) | |
| 776 { | |
| 777 throw new RuntimeException("recreating selector",e); | |
| 778 } | |
| 779 } | |
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780 |
| 865 | 781 /* ------------------------------------------------------------ */ |
| 782 public SelectorManager getManager() | |
| 783 { | |
| 784 return SelectorManager.this; | |
| 785 } | |
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786 |
| 865 | 787 /* ------------------------------------------------------------ */ |
| 788 public long getNow() | |
| 789 { | |
| 790 return _timeout.getNow(); | |
| 791 } | |
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792 |
| 865 | 793 /* ------------------------------------------------------------ */ |
| 794 /** | |
| 795 * @param task The task to timeout. If it implements Runnable, then | |
| 796 * expired will be called from a dispatched thread. | |
| 797 * | |
| 798 * @param timeoutMs | |
| 799 */ | |
| 800 public void scheduleTimeout(Timeout.Task task, long timeoutMs) | |
| 801 { | |
| 802 if (!(task instanceof Runnable)) | |
| 803 throw new IllegalArgumentException("!Runnable"); | |
| 804 _timeout.schedule(task, timeoutMs); | |
| 805 } | |
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806 |
| 865 | 807 /* ------------------------------------------------------------ */ |
| 808 public void cancelTimeout(Timeout.Task task) | |
| 809 { | |
| 810 task.cancel(); | |
| 811 } | |
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812 |
| 865 | 813 /* ------------------------------------------------------------ */ |
| 814 public void wakeup() | |
| 815 { | |
| 816 try | |
| 817 { | |
| 818 Selector selector = _selector; | |
| 819 if (selector!=null) | |
| 820 selector.wakeup(); | |
| 821 } | |
| 822 catch(Exception e) | |
| 823 { | |
| 824 addChange(new ChangeTask() | |
| 825 { | |
| 826 public void run() | |
| 827 { | |
| 828 renewSelector(); | |
| 829 } | |
| 830 }); | |
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831 |
| 865 | 832 renewSelector(); |
| 833 } | |
| 834 } | |
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835 |
| 865 | 836 /* ------------------------------------------------------------ */ |
| 837 private SelectChannelEndPoint createEndPoint(SocketChannel channel, SelectionKey sKey) throws IOException | |
| 838 { | |
| 839 SelectChannelEndPoint endp = newEndPoint(channel,this,sKey); | |
| 840 LOG.debug("created {}",endp); | |
| 841 endPointOpened(endp); | |
| 842 _endPoints.put(endp,this); | |
| 843 return endp; | |
| 844 } | |
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845 |
| 865 | 846 /* ------------------------------------------------------------ */ |
| 847 public void destroyEndPoint(SelectChannelEndPoint endp) | |
| 848 { | |
| 849 LOG.debug("destroyEndPoint {}",endp); | |
| 850 _endPoints.remove(endp); | |
| 851 endPointClosed(endp); | |
| 852 } | |
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853 |
| 865 | 854 /* ------------------------------------------------------------ */ |
| 855 Selector getSelector() | |
| 856 { | |
| 857 return _selector; | |
| 858 } | |
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859 |
| 865 | 860 /* ------------------------------------------------------------ */ |
| 861 void stop() throws Exception | |
| 862 { | |
| 863 // Spin for a while waiting for selector to complete | |
| 864 // to avoid unneccessary closed channel exceptions | |
| 865 try | |
| 866 { | |
| 867 for (int i=0;i<100 && _selecting!=null;i++) | |
| 868 { | |
| 869 wakeup(); | |
| 870 Thread.sleep(10); | |
| 871 } | |
| 872 } | |
| 873 catch(Exception e) | |
| 874 { | |
| 875 LOG.trace("",e); | |
| 876 } | |
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877 |
| 865 | 878 // close endpoints and selector |
| 879 synchronized (this) | |
| 880 { | |
| 881 Selector selector=_selector; | |
| 882 for (SelectionKey key:selector.keys()) | |
| 883 { | |
| 884 if (key==null) | |
| 885 continue; | |
| 886 Object att=key.attachment(); | |
| 887 if (att instanceof EndPoint) | |
| 888 { | |
| 889 EndPoint endpoint = (EndPoint)att; | |
| 890 try | |
| 891 { | |
| 892 endpoint.close(); | |
| 893 } | |
| 894 catch(IOException e) | |
| 895 { | |
| 896 LOG.trace("",e); | |
| 897 } | |
| 898 } | |
| 899 } | |
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900 |
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901 |
| 865 | 902 _timeout.cancelAll(); |
| 903 try | |
| 904 { | |
| 905 selector=_selector; | |
| 906 if (selector != null) | |
| 907 selector.close(); | |
| 908 } | |
| 909 catch (IOException e) | |
| 910 { | |
| 911 LOG.trace("",e); | |
| 912 } | |
| 913 _selector=null; | |
| 914 } | |
| 915 } | |
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916 |
| 865 | 917 /* ------------------------------------------------------------ */ |
| 918 public String dump() | |
| 919 { | |
| 920 return AggregateLifeCycle.dump(this); | |
| 921 } | |
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922 |
| 865 | 923 /* ------------------------------------------------------------ */ |
| 924 public void dump(Appendable out, String indent) throws IOException | |
| 925 { | |
| 926 out.append(String.valueOf(this)).append(" id=").append(String.valueOf(_setID)).append("\n"); | |
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927 |
| 865 | 928 Thread selecting = _selecting; |
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929 |
| 865 | 930 Object where = "not selecting"; |
| 931 StackTraceElement[] trace =selecting==null?null:selecting.getStackTrace(); | |
| 932 if (trace!=null) | |
| 933 { | |
| 934 for (StackTraceElement t:trace) | |
| 935 if (t.getClassName().startsWith("org.eclipse.jetty.")) | |
| 936 { | |
| 937 where=t; | |
| 938 break; | |
| 939 } | |
| 940 } | |
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941 |
| 865 | 942 Selector selector=_selector; |
| 943 if (selector!=null) | |
| 944 { | |
| 945 final ArrayList<Object> dump = new ArrayList<Object>(selector.keys().size()*2); | |
| 946 dump.add(where); | |
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947 |
| 865 | 948 final CountDownLatch latch = new CountDownLatch(1); |
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949 |
| 865 | 950 addChange(new ChangeTask() |
| 951 { | |
| 952 public void run() | |
| 953 { | |
| 954 dumpKeyState(dump); | |
| 955 latch.countDown(); | |
| 956 } | |
| 957 }); | |
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958 |
| 865 | 959 try |
| 960 { | |
| 961 latch.await(5,TimeUnit.SECONDS); | |
| 962 } | |
| 963 catch(InterruptedException e) | |
| 964 { | |
| 965 LOG.trace("",e); | |
| 966 } | |
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967 |
| 865 | 968 AggregateLifeCycle.dump(out,indent,dump); |
| 969 } | |
| 970 } | |
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971 |
| 865 | 972 /* ------------------------------------------------------------ */ |
| 973 public void dumpKeyState(List<Object> dumpto) | |
| 974 { | |
| 975 Selector selector=_selector; | |
| 976 Set<SelectionKey> keys = selector.keys(); | |
| 977 dumpto.add(selector + " keys=" + keys.size()); | |
| 978 for (SelectionKey key: keys) | |
| 979 { | |
| 980 if (key.isValid()) | |
| 981 dumpto.add(key.attachment()+" iOps="+key.interestOps()+" rOps="+key.readyOps()); | |
| 982 else | |
| 983 dumpto.add(key.attachment()+" iOps=-1 rOps=-1"); | |
| 984 } | |
| 985 } | |
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986 |
| 865 | 987 /* ------------------------------------------------------------ */ |
| 988 public String toString() | |
| 989 { | |
| 990 Selector selector=_selector; | |
| 991 return String.format("%s keys=%d selected=%d", | |
| 992 super.toString(), | |
| 993 selector != null && selector.isOpen() ? selector.keys().size() : -1, | |
| 994 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1); | |
| 995 } | |
| 996 } | |
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997 |
| 865 | 998 /* ------------------------------------------------------------ */ |
| 999 private static class ChannelAndAttachment | |
| 1000 { | |
| 1001 final SelectableChannel _channel; | |
| 1002 final Object _attachment; | |
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1003 |
| 865 | 1004 public ChannelAndAttachment(SelectableChannel channel, Object attachment) |
| 1005 { | |
| 1006 super(); | |
| 1007 _channel = channel; | |
| 1008 _attachment = attachment; | |
| 1009 } | |
| 1010 } | |
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1011 |
| 865 | 1012 /* ------------------------------------------------------------ */ |
| 1013 public boolean isDeferringInterestedOps0() | |
| 1014 { | |
| 1015 return _deferringInterestedOps0; | |
| 1016 } | |
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1017 |
| 865 | 1018 /* ------------------------------------------------------------ */ |
| 1019 public void setDeferringInterestedOps0(boolean deferringInterestedOps0) | |
| 1020 { | |
| 1021 _deferringInterestedOps0 = deferringInterestedOps0; | |
| 1022 } | |
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1023 |
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1024 |
| 865 | 1025 /* ------------------------------------------------------------ */ |
| 1026 /* ------------------------------------------------------------ */ | |
| 1027 /* ------------------------------------------------------------ */ | |
| 1028 private interface ChangeTask extends Runnable | |
| 1029 {} | |
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1030 |
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1031 } |