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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 944:1d24b6e422fa
simplify SelectorManager
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Tue, 11 Oct 2016 20:16:03 -0600 |
| parents | 96f60ce98949 |
| children | f5aefdc4a81a |
| 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.Collections; |
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33 import java.util.Set; |
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34 import java.util.concurrent.ConcurrentHashMap; |
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35 import java.util.concurrent.ConcurrentLinkedQueue; |
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36 import java.util.concurrent.ConcurrentMap; |
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37 import java.util.concurrent.CountDownLatch; |
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38 import java.util.concurrent.TimeUnit; |
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39 |
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40 import org.eclipse.jetty.io.AsyncEndPoint; |
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41 import org.eclipse.jetty.io.ConnectedEndPoint; |
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42 import org.eclipse.jetty.io.Connection; |
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43 import org.eclipse.jetty.io.EndPoint; |
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44 import org.eclipse.jetty.util.TypeUtil; |
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45 import org.eclipse.jetty.util.component.AbstractLifeCycle; |
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46 import org.eclipse.jetty.util.component.AggregateLifeCycle; |
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47 import org.eclipse.jetty.util.component.Dumpable; |
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48 import org.slf4j.Logger; |
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49 import org.slf4j.LoggerFactory; |
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50 |
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51 |
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52 /* ------------------------------------------------------------ */ |
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53 /** |
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54 * The Selector Manager manages and number of SelectSets to allow |
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55 * NIO scheduling to scale to large numbers of connections. |
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56 * <p> |
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57 */ |
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58 public abstract class SelectorManager extends AbstractLifeCycle implements Dumpable |
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59 { |
| 865 | 60 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio"); |
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61 |
| 865 | 62 private static final int __MONITOR_PERIOD=Integer.getInteger("org.eclipse.jetty.io.nio.MONITOR_PERIOD",1000).intValue(); |
| 63 private static final int __MAX_SELECTS=Integer.getInteger("org.eclipse.jetty.io.nio.MAX_SELECTS",100000).intValue(); | |
| 64 private static final int __BUSY_PAUSE=Integer.getInteger("org.eclipse.jetty.io.nio.BUSY_PAUSE",50).intValue(); | |
| 65 private static final int __IDLE_TICK=Integer.getInteger("org.eclipse.jetty.io.nio.IDLE_TICK",400).intValue(); | |
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66 |
| 865 | 67 private int _maxIdleTime; |
| 68 private long _lowResourcesConnections; | |
| 69 private SelectSet[] _selectSet; | |
| 70 private int _selectSets=1; | |
| 71 private volatile int _set=0; | |
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72 |
| 865 | 73 /* ------------------------------------------------------------ */ |
| 74 /** | |
| 75 * @param maxIdleTime The maximum period in milli seconds that a connection may be idle before it is closed. | |
| 76 * @see #setLowResourcesMaxIdleTime(long) | |
| 77 */ | |
| 78 public void setMaxIdleTime(long maxIdleTime) | |
| 79 { | |
| 80 _maxIdleTime=(int)maxIdleTime; | |
| 81 } | |
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82 |
| 865 | 83 /* ------------------------------------------------------------ */ |
| 84 /** | |
| 85 * @param selectSets number of select sets to create | |
| 86 */ | |
| 87 public void setSelectSets(int selectSets) | |
| 88 { | |
| 89 long lrc = _lowResourcesConnections * _selectSets; | |
| 90 _selectSets=selectSets; | |
| 91 _lowResourcesConnections=lrc/_selectSets; | |
| 92 } | |
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93 |
| 865 | 94 /* ------------------------------------------------------------ */ |
| 95 /** | |
| 96 * @return the max idle time | |
| 97 */ | |
| 98 public long getMaxIdleTime() | |
| 99 { | |
| 100 return _maxIdleTime; | |
| 101 } | |
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102 |
| 865 | 103 /* ------------------------------------------------------------ */ |
| 104 /** | |
| 105 * @return the number of select sets in use | |
| 106 */ | |
| 107 public int getSelectSets() | |
| 108 { | |
| 109 return _selectSets; | |
| 110 } | |
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111 |
| 865 | 112 /* ------------------------------------------------------------ */ |
| 113 /** | |
| 114 * @param i | |
| 115 * @return The select set | |
| 116 */ | |
| 117 public SelectSet getSelectSet(int i) | |
| 118 { | |
| 119 return _selectSet[i]; | |
| 120 } | |
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121 |
| 865 | 122 /* ------------------------------------------------------------ */ |
| 123 /** Register a channel | |
| 124 * @param channel | |
| 125 */ | |
| 126 public void register(SocketChannel channel) | |
| 127 { | |
| 128 // The ++ increment here is not atomic, but it does not matter. | |
| 129 // so long as the value changes sometimes, then connections will | |
| 130 // be distributed over the available sets. | |
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131 |
| 865 | 132 int s=_set++; |
| 133 if (s<0) | |
| 134 s=-s; | |
| 135 s=s%_selectSets; | |
| 136 SelectSet[] sets=_selectSet; | |
| 137 if (sets!=null) | |
| 138 { | |
| 139 SelectSet set=sets[s]; | |
| 140 set.addChange(channel); | |
| 141 set.wakeup(); | |
| 142 } | |
| 143 } | |
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144 |
| 865 | 145 /* ------------------------------------------------------------ */ |
| 146 /** Register a {@link ServerSocketChannel} | |
| 147 * @param acceptChannel | |
| 148 */ | |
| 149 public void register(ServerSocketChannel acceptChannel) | |
| 150 { | |
| 151 int s=_set++; | |
| 152 if (s<0) | |
| 153 s=-s; | |
| 154 s=s%_selectSets; | |
| 155 SelectSet set=_selectSet[s]; | |
| 156 set.addChange(acceptChannel); | |
| 157 set.wakeup(); | |
| 158 } | |
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159 |
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160 |
| 865 | 161 /* ------------------------------------------------------------ */ |
| 162 /** | |
| 163 * @return the lowResourcesConnections | |
| 164 */ | |
| 165 public long getLowResourcesConnections() | |
| 166 { | |
| 167 return _lowResourcesConnections*_selectSets; | |
| 168 } | |
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169 |
| 865 | 170 /* ------------------------------------------------------------ */ |
| 171 /** | |
| 172 * Set the number of connections, which if exceeded places this manager in low resources state. | |
| 173 * This is not an exact measure as the connection count is averaged over the select sets. | |
| 174 * @param lowResourcesConnections the number of connections | |
| 175 * @see #setLowResourcesMaxIdleTime(long) | |
| 176 */ | |
| 177 public void setLowResourcesConnections(long lowResourcesConnections) | |
| 178 { | |
| 179 _lowResourcesConnections=(lowResourcesConnections+_selectSets-1)/_selectSets; | |
| 180 } | |
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181 |
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182 |
| 865 | 183 public abstract void execute(Runnable task); |
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184 |
| 865 | 185 /* ------------------------------------------------------------ */ |
| 186 /* (non-Javadoc) | |
| 187 * @see org.eclipse.component.AbstractLifeCycle#doStart() | |
| 188 */ | |
| 189 @Override | |
| 190 protected void doStart() throws Exception | |
| 191 { | |
| 192 _selectSet = new SelectSet[_selectSets]; | |
| 193 for (int i=0;i<_selectSet.length;i++) | |
| 194 _selectSet[i]= new SelectSet(i); | |
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195 |
| 865 | 196 super.doStart(); |
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197 |
| 865 | 198 // start a thread to Select |
| 199 for (int i=0;i<getSelectSets();i++) | |
| 200 { | |
| 201 final int id=i; | |
| 202 execute(new Runnable() | |
| 203 { | |
| 204 public void run() | |
| 205 { | |
| 206 String name=Thread.currentThread().getName(); | |
| 207 try | |
| 208 { | |
| 209 SelectSet[] sets=_selectSet; | |
| 210 if (sets==null) | |
| 211 return; | |
| 212 SelectSet set=sets[id]; | |
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213 |
| 865 | 214 Thread.currentThread().setName(name+" Selector"+id); |
| 215 LOG.debug("Starting {} on {}",Thread.currentThread(),this); | |
| 216 while (isRunning()) | |
| 217 { | |
| 218 try | |
| 219 { | |
| 220 set.doSelect(); | |
| 221 } | |
| 222 catch(IOException e) | |
| 223 { | |
| 224 LOG.trace("",e); | |
| 225 } | |
| 226 catch(Exception e) | |
| 227 { | |
| 228 LOG.warn("",e); | |
| 229 } | |
| 230 } | |
| 231 } | |
| 232 finally | |
| 233 { | |
| 234 LOG.debug("Stopped {} on {}",Thread.currentThread(),this); | |
| 235 Thread.currentThread().setName(name); | |
| 236 } | |
| 237 } | |
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238 |
| 865 | 239 }); |
| 240 } | |
| 241 } | |
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242 |
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243 |
| 865 | 244 /* ------------------------------------------------------------------------------- */ |
| 245 @Override | |
| 246 protected void doStop() throws Exception | |
| 247 { | |
| 248 SelectSet[] sets= _selectSet; | |
| 249 _selectSet=null; | |
| 250 if (sets!=null) | |
| 251 { | |
| 252 for (SelectSet set : sets) | |
| 253 { | |
| 254 if (set!=null) | |
| 255 set.stop(); | |
| 256 } | |
| 257 } | |
| 258 super.doStop(); | |
| 259 } | |
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260 |
| 865 | 261 /* ------------------------------------------------------------ */ |
| 262 /** | |
| 263 * @param endpoint | |
| 264 */ | |
| 265 protected abstract void endPointClosed(SelectChannelEndPoint endpoint); | |
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266 |
| 865 | 267 /* ------------------------------------------------------------------------------- */ |
| 268 public abstract AsyncConnection newConnection(SocketChannel channel, AsyncEndPoint endpoint, Object attachment); | |
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269 |
| 865 | 270 /* ------------------------------------------------------------ */ |
| 271 /** | |
| 272 * Create a new end point | |
| 273 * @param channel | |
| 274 * @param selectSet | |
| 275 * @param sKey the selection key | |
| 276 * @return the new endpoint {@link SelectChannelEndPoint} | |
| 277 * @throws IOException | |
| 278 */ | |
| 279 protected abstract SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectorManager.SelectSet selectSet, SelectionKey sKey) throws IOException; | |
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280 |
| 865 | 281 /* ------------------------------------------------------------------------------- */ |
| 282 protected void connectionFailed(SocketChannel channel,Throwable ex,Object attachment) | |
| 283 { | |
| 284 LOG.warn(ex+","+channel+","+attachment); | |
| 285 LOG.debug("",ex); | |
| 286 } | |
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287 |
| 865 | 288 /* ------------------------------------------------------------ */ |
| 289 public String dump() | |
| 290 { | |
| 291 return AggregateLifeCycle.dump(this); | |
| 292 } | |
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293 |
| 865 | 294 /* ------------------------------------------------------------ */ |
| 295 public void dump(Appendable out, String indent) throws IOException | |
| 296 { | |
| 297 AggregateLifeCycle.dumpObject(out,this); | |
| 298 AggregateLifeCycle.dump(out,indent,TypeUtil.asList(_selectSet)); | |
| 299 } | |
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300 |
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301 |
| 865 | 302 /* ------------------------------------------------------------------------------- */ |
| 303 /* ------------------------------------------------------------------------------- */ | |
| 304 /* ------------------------------------------------------------------------------- */ | |
| 305 public class SelectSet implements Dumpable | |
| 306 { | |
| 307 private final int _setID; | |
| 943 | 308 private volatile long _now = System.currentTimeMillis(); |
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309 |
| 865 | 310 private final ConcurrentLinkedQueue<Object> _changes = new ConcurrentLinkedQueue<Object>(); |
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311 |
| 865 | 312 private volatile Selector _selector; |
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313 |
| 865 | 314 private volatile Thread _selecting; |
| 315 private int _busySelects; | |
| 316 private long _monitorNext; | |
| 317 private boolean _pausing; | |
| 318 private boolean _paused; | |
| 319 private volatile long _idleTick; | |
| 320 private ConcurrentMap<SelectChannelEndPoint,Object> _endPoints = new ConcurrentHashMap<SelectChannelEndPoint, Object>(); | |
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321 |
| 865 | 322 SelectSet(int acceptorID) throws Exception |
| 323 { | |
| 324 _setID=acceptorID; | |
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325 |
| 865 | 326 _idleTick = System.currentTimeMillis(); |
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327 |
| 865 | 328 // create a selector; |
| 329 _selector = Selector.open(); | |
| 330 _monitorNext=System.currentTimeMillis()+__MONITOR_PERIOD; | |
| 331 } | |
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332 |
| 865 | 333 public void addChange(Object change) |
| 334 { | |
| 335 _changes.add(change); | |
| 336 } | |
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337 |
| 865 | 338 /* ------------------------------------------------------------ */ |
| 339 /** | |
| 340 * Select and dispatch tasks found from changes and the selector. | |
| 341 * | |
| 342 * @throws IOException | |
| 343 */ | |
| 344 public void doSelect() throws IOException | |
| 345 { | |
| 346 try | |
| 347 { | |
| 348 _selecting=Thread.currentThread(); | |
| 349 final Selector selector=_selector; | |
| 350 // Stopped concurrently ? | |
| 351 if (selector == null) | |
| 352 return; | |
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353 |
| 865 | 354 // Make any key changes required |
| 355 Object change; | |
| 356 int changes=_changes.size(); | |
| 357 while (changes-->0 && (change=_changes.poll())!=null) | |
| 358 { | |
| 359 Channel ch=null; | |
| 360 SelectionKey key=null; | |
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361 |
| 865 | 362 try |
| 363 { | |
| 364 if (change instanceof EndPoint) | |
| 365 { | |
| 366 // Update the operations for a key. | |
| 367 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)change; | |
| 368 ch=endpoint.getChannel(); | |
| 369 endpoint.doUpdateKey(); | |
| 370 } | |
| 371 else if (change instanceof SocketChannel) | |
| 372 { | |
| 373 // Newly registered channel | |
| 374 final SocketChannel channel=(SocketChannel)change; | |
| 375 ch=channel; | |
| 376 key = channel.register(selector,SelectionKey.OP_READ,null); | |
| 377 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 378 key.attach(endpoint); | |
| 379 endpoint.schedule(); | |
| 380 } | |
| 381 else if (change instanceof Runnable) | |
| 382 { | |
| 383 execute((Runnable)change); | |
| 384 } | |
| 385 else | |
| 386 throw new IllegalArgumentException(change.toString()); | |
| 387 } | |
| 388 catch (CancelledKeyException e) | |
| 389 { | |
| 390 LOG.trace("",e); | |
| 391 } | |
| 392 catch (Throwable e) | |
| 393 { | |
| 394 if (isRunning()) | |
| 395 LOG.warn("",e); | |
| 396 else | |
| 397 LOG.debug("",e); | |
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398 |
| 865 | 399 try |
| 400 { | |
| 401 if (ch!=null) | |
| 402 ch.close(); | |
| 403 } | |
| 404 catch(IOException e2) | |
| 405 { | |
| 406 LOG.debug("",e2); | |
| 407 } | |
| 408 } | |
| 409 } | |
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410 |
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411 |
| 865 | 412 // Do and instant select to see if any connections can be handled. |
| 413 int selected=selector.selectNow(); | |
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414 |
| 943 | 415 _now = System.currentTimeMillis(); |
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416 |
| 865 | 417 // if no immediate things to do |
| 418 if (selected==0 && selector.selectedKeys().isEmpty()) | |
| 419 { | |
| 420 // If we are in pausing mode | |
| 421 if (_pausing) | |
| 422 { | |
| 423 try | |
| 424 { | |
| 425 Thread.sleep(__BUSY_PAUSE); // pause to reduce impact of busy loop | |
| 426 } | |
| 427 catch(InterruptedException e) | |
| 428 { | |
| 429 LOG.trace("",e); | |
| 430 } | |
| 943 | 431 _now = System.currentTimeMillis(); |
| 865 | 432 } |
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433 |
| 865 | 434 // workout how long to wait in select |
| 435 long wait = _changes.size()==0?__IDLE_TICK:0L; | |
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436 |
| 865 | 437 // If we should wait with a select |
| 438 if (wait>0) | |
| 439 { | |
| 943 | 440 long before = _now; |
| 865 | 441 selector.select(wait); |
| 943 | 442 _now = System.currentTimeMillis(); |
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443 |
| 865 | 444 // If we are monitoring for busy selector |
| 445 // and this select did not wait more than 1ms | |
| 943 | 446 if (__MONITOR_PERIOD>0 && _now-before <=1) |
| 865 | 447 { |
| 448 // count this as a busy select and if there have been too many this monitor cycle | |
| 449 if (++_busySelects>__MAX_SELECTS) | |
| 450 { | |
| 451 // Start injecting pauses | |
| 452 _pausing=true; | |
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453 |
| 865 | 454 // if this is the first pause |
| 455 if (!_paused) | |
| 456 { | |
| 457 // Log and dump some status | |
| 458 _paused=true; | |
| 459 LOG.warn("Selector {} is too busy, pausing!",this); | |
| 460 } | |
| 461 } | |
| 462 } | |
| 463 } | |
| 464 } | |
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465 |
| 865 | 466 // have we been destroyed while sleeping |
| 467 if (_selector==null || !selector.isOpen()) | |
| 468 return; | |
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469 |
| 865 | 470 // Look for things to do |
| 471 for (SelectionKey key: selector.selectedKeys()) | |
| 472 { | |
| 473 SocketChannel channel=null; | |
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474 |
| 865 | 475 try |
| 476 { | |
| 477 if (!key.isValid()) | |
| 478 { | |
| 479 key.cancel(); | |
| 480 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); | |
| 481 if (endpoint != null) | |
| 482 endpoint.doUpdateKey(); | |
| 483 continue; | |
| 484 } | |
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485 |
| 865 | 486 Object att = key.attachment(); |
| 487 if (att instanceof SelectChannelEndPoint) | |
| 488 { | |
| 489 if (key.isReadable()||key.isWritable()) | |
| 490 ((SelectChannelEndPoint)att).schedule(); | |
| 491 } | |
| 492 else if (key.isConnectable()) | |
| 493 { | |
| 494 // Complete a connection of a registered channel | |
| 495 channel = (SocketChannel)key.channel(); | |
| 496 boolean connected=false; | |
| 497 try | |
| 498 { | |
| 499 connected=channel.finishConnect(); | |
| 500 } | |
| 501 catch(Exception e) | |
| 502 { | |
| 503 connectionFailed(channel,e,att); | |
| 504 } | |
| 505 finally | |
| 506 { | |
| 507 if (connected) | |
| 508 { | |
| 509 key.interestOps(SelectionKey.OP_READ); | |
| 510 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 511 key.attach(endpoint); | |
| 512 endpoint.schedule(); | |
| 513 } | |
| 514 else | |
| 515 { | |
| 516 key.cancel(); | |
| 517 channel.close(); | |
| 518 } | |
| 519 } | |
| 520 } | |
| 521 else | |
| 522 { | |
| 523 // Wrap readable registered channel in an endpoint | |
| 524 channel = (SocketChannel)key.channel(); | |
| 525 SelectChannelEndPoint endpoint = createEndPoint(channel,key); | |
| 526 key.attach(endpoint); | |
| 527 if (key.isReadable()) | |
| 528 endpoint.schedule(); | |
| 529 } | |
| 530 key = null; | |
| 531 } | |
| 532 catch (CancelledKeyException e) | |
| 533 { | |
| 534 LOG.trace("",e); | |
| 535 } | |
| 536 catch (Exception e) | |
| 537 { | |
| 538 if (isRunning()) | |
| 539 LOG.warn("",e); | |
| 540 else | |
| 541 LOG.trace("",e); | |
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542 |
| 865 | 543 try |
| 544 { | |
| 545 if (channel!=null) | |
| 546 channel.close(); | |
| 547 } | |
| 548 catch(IOException e2) | |
| 549 { | |
| 550 LOG.debug("",e2); | |
| 551 } | |
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552 |
| 865 | 553 if (key != null && !(key.channel() instanceof ServerSocketChannel) && key.isValid()) |
| 554 key.cancel(); | |
| 555 } | |
| 556 } | |
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557 |
| 865 | 558 // Everything always handled |
| 559 selector.selectedKeys().clear(); | |
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560 |
| 943 | 561 _now = System.currentTimeMillis(); |
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562 |
| 865 | 563 // Idle tick |
| 943 | 564 if (_now-_idleTick>__IDLE_TICK) |
| 865 | 565 { |
| 943 | 566 _idleTick = _now; |
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567 |
| 865 | 568 final long idle_now=((_lowResourcesConnections>0 && selector.keys().size()>_lowResourcesConnections)) |
| 943 | 569 ?(_now+_maxIdleTime) |
| 570 :_now; | |
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571 |
| 865 | 572 execute(new Runnable() |
| 573 { | |
| 574 public void run() | |
| 575 { | |
| 576 for (SelectChannelEndPoint endp:_endPoints.keySet()) | |
| 577 { | |
| 578 endp.checkIdleTimestamp(idle_now); | |
| 579 } | |
| 580 } | |
| 581 public String toString() {return "Idle-"+super.toString();} | |
| 582 }); | |
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583 |
| 865 | 584 } |
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585 |
| 865 | 586 // Reset busy select monitor counts |
| 943 | 587 if (__MONITOR_PERIOD>0 && _now>_monitorNext) |
| 865 | 588 { |
| 589 _busySelects=0; | |
| 590 _pausing=false; | |
| 943 | 591 _monitorNext=_now+__MONITOR_PERIOD; |
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592 |
| 865 | 593 } |
| 594 } | |
| 595 catch (ClosedSelectorException e) | |
| 596 { | |
| 597 if (isRunning()) | |
| 598 LOG.warn("",e); | |
| 599 else | |
| 600 LOG.trace("",e); | |
| 601 } | |
| 602 catch (CancelledKeyException e) | |
| 603 { | |
| 604 LOG.trace("",e); | |
| 605 } | |
| 606 finally | |
| 607 { | |
| 608 _selecting=null; | |
| 609 } | |
| 610 } | |
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611 |
| 865 | 612 public SelectorManager getManager() |
| 613 { | |
| 614 return SelectorManager.this; | |
| 615 } | |
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616 |
| 865 | 617 public long getNow() |
| 618 { | |
| 943 | 619 return _now; |
| 865 | 620 } |
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621 |
| 865 | 622 public void wakeup() |
| 623 { | |
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624 Selector selector = _selector; |
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625 if (selector!=null) |
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626 selector.wakeup(); |
| 865 | 627 } |
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628 |
| 865 | 629 private SelectChannelEndPoint createEndPoint(SocketChannel channel, SelectionKey sKey) throws IOException |
| 630 { | |
| 631 SelectChannelEndPoint endp = newEndPoint(channel,this,sKey); | |
| 632 LOG.debug("created {}",endp); | |
| 633 _endPoints.put(endp,this); | |
| 634 return endp; | |
| 635 } | |
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636 |
| 865 | 637 public void destroyEndPoint(SelectChannelEndPoint endp) |
| 638 { | |
| 639 LOG.debug("destroyEndPoint {}",endp); | |
| 640 _endPoints.remove(endp); | |
| 641 endPointClosed(endp); | |
| 642 } | |
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643 |
| 865 | 644 Selector getSelector() |
| 645 { | |
| 646 return _selector; | |
| 647 } | |
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648 |
| 865 | 649 void stop() throws Exception |
| 650 { | |
| 651 // Spin for a while waiting for selector to complete | |
| 652 // to avoid unneccessary closed channel exceptions | |
| 653 try | |
| 654 { | |
| 655 for (int i=0;i<100 && _selecting!=null;i++) | |
| 656 { | |
| 657 wakeup(); | |
| 658 Thread.sleep(10); | |
| 659 } | |
| 660 } | |
| 661 catch(Exception e) | |
| 662 { | |
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663 LOG.warn("",e); |
| 865 | 664 } |
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665 |
| 865 | 666 // close endpoints and selector |
| 667 synchronized (this) | |
| 668 { | |
| 669 Selector selector=_selector; | |
| 670 for (SelectionKey key:selector.keys()) | |
| 671 { | |
| 672 if (key==null) | |
| 673 continue; | |
| 674 Object att=key.attachment(); | |
| 675 if (att instanceof EndPoint) | |
| 676 { | |
| 677 EndPoint endpoint = (EndPoint)att; | |
| 678 try | |
| 679 { | |
| 680 endpoint.close(); | |
| 681 } | |
| 682 catch(IOException e) | |
| 683 { | |
| 684 LOG.trace("",e); | |
| 685 } | |
| 686 } | |
| 687 } | |
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688 |
| 865 | 689 try |
| 690 { | |
| 691 selector=_selector; | |
| 692 if (selector != null) | |
| 693 selector.close(); | |
| 694 } | |
| 695 catch (IOException e) | |
| 696 { | |
| 697 LOG.trace("",e); | |
| 698 } | |
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699 _selector = null; |
| 865 | 700 } |
| 701 } | |
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702 |
| 865 | 703 public String dump() |
| 704 { | |
| 705 return AggregateLifeCycle.dump(this); | |
| 706 } | |
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707 |
| 865 | 708 public void dump(Appendable out, String indent) throws IOException |
| 709 { | |
| 710 out.append(String.valueOf(this)).append(" id=").append(String.valueOf(_setID)).append("\n"); | |
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711 AggregateLifeCycle.dump(out,indent,Collections.emptyList()); |
| 865 | 712 } |
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713 |
| 865 | 714 public String toString() |
| 715 { | |
| 716 Selector selector=_selector; | |
| 717 return String.format("%s keys=%d selected=%d", | |
| 718 super.toString(), | |
| 719 selector != null && selector.isOpen() ? selector.keys().size() : -1, | |
| 720 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1); | |
| 721 } | |
| 722 } | |
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723 |
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724 } |