Mercurial Hosting > luan
annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 960:3cd4c706a61f
simplify ChannelEndPoint
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Thu, 13 Oct 2016 21:29:19 -0600 |
| parents | 7b94f5b33c64 |
| 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.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.ServerSocketChannel; |
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28 import java.nio.channels.SocketChannel; |
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29 import java.util.ArrayList; |
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30 import java.util.List; |
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31 import java.util.Collections; |
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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 |
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50 |
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51 /* ------------------------------------------------------------ */ |
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52 /** |
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53 * The Selector Manager manages and number of SelectSets to allow |
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54 * NIO scheduling to scale to large numbers of connections. |
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55 * <p> |
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56 */ |
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57 public abstract class SelectorManager extends AbstractLifeCycle implements Dumpable |
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58 { |
| 865 | 59 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio"); |
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60 |
| 865 | 61 private int _maxIdleTime; |
| 62 private long _lowResourcesConnections; | |
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63 private SelectSet _selectSet; |
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64 |
| 865 | 65 /* ------------------------------------------------------------ */ |
| 66 /** | |
| 67 * @param maxIdleTime The maximum period in milli seconds that a connection may be idle before it is closed. | |
| 68 * @see #setLowResourcesMaxIdleTime(long) | |
| 69 */ | |
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70 public void setMaxIdleTime(int maxIdleTime) |
| 865 | 71 { |
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72 _maxIdleTime = maxIdleTime; |
| 865 | 73 } |
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74 |
| 865 | 75 /* ------------------------------------------------------------ */ |
| 76 /** Register a channel | |
| 77 * @param channel | |
| 78 */ | |
| 79 public void register(SocketChannel channel) | |
| 80 { | |
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81 SelectSet set = _selectSet; |
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82 if (set!=null) |
| 865 | 83 { |
| 84 set.addChange(channel); | |
| 85 } | |
| 86 } | |
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87 |
| 865 | 88 /* ------------------------------------------------------------ */ |
| 89 /** | |
| 90 * @return the lowResourcesConnections | |
| 91 */ | |
| 92 public long getLowResourcesConnections() | |
| 93 { | |
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94 return _lowResourcesConnections; |
| 865 | 95 } |
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96 |
| 865 | 97 /* ------------------------------------------------------------ */ |
| 98 /** | |
| 99 * Set the number of connections, which if exceeded places this manager in low resources state. | |
| 100 * This is not an exact measure as the connection count is averaged over the select sets. | |
| 101 * @param lowResourcesConnections the number of connections | |
| 102 * @see #setLowResourcesMaxIdleTime(long) | |
| 103 */ | |
| 104 public void setLowResourcesConnections(long lowResourcesConnections) | |
| 105 { | |
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106 _lowResourcesConnections = lowResourcesConnections; |
| 865 | 107 } |
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108 |
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109 |
| 865 | 110 public abstract void execute(Runnable task); |
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111 |
| 865 | 112 /* ------------------------------------------------------------ */ |
| 113 /* (non-Javadoc) | |
| 114 * @see org.eclipse.component.AbstractLifeCycle#doStart() | |
| 115 */ | |
| 116 @Override | |
| 117 protected void doStart() throws Exception | |
| 118 { | |
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119 _selectSet = new SelectSet(); |
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120 |
| 865 | 121 super.doStart(); |
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122 |
| 865 | 123 // start a thread to Select |
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124 execute(new Runnable() |
| 865 | 125 { |
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126 public void run() |
| 865 | 127 { |
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128 String name=Thread.currentThread().getName(); |
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129 try |
| 865 | 130 { |
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131 SelectSet set = _selectSet; |
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132 if (set==null) |
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133 return; |
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134 |
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135 Thread.currentThread().setName(name+" Selector"); |
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136 LOG.debug("Starting {} on {}",Thread.currentThread(),this); |
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137 while (isRunning()) |
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138 { |
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139 try |
| 865 | 140 { |
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141 set.doSelect(); |
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142 } |
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143 catch(IOException e) |
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144 { |
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145 LOG.trace("",e); |
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146 } |
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147 catch(Exception e) |
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148 { |
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149 LOG.warn("",e); |
| 865 | 150 } |
| 151 } | |
| 152 } | |
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153 finally |
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154 { |
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155 LOG.debug("Stopped {} on {}",Thread.currentThread(),this); |
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156 Thread.currentThread().setName(name); |
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157 } |
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158 } |
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159 |
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160 }); |
| 865 | 161 } |
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162 |
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163 |
| 865 | 164 @Override |
| 165 protected void doStop() throws Exception | |
| 166 { | |
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167 SelectSet set = _selectSet; |
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168 _selectSet = null; |
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169 if (set!=null) |
| 865 | 170 { |
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171 set.stop(); |
| 865 | 172 } |
| 173 super.doStop(); | |
| 174 } | |
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175 |
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176 public abstract AsyncConnection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint); |
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177 |
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178 @Override |
| 865 | 179 public String dump() |
| 180 { | |
| 181 return AggregateLifeCycle.dump(this); | |
| 182 } | |
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183 |
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184 @Override |
| 865 | 185 public void dump(Appendable out, String indent) throws IOException |
| 186 { | |
| 187 AggregateLifeCycle.dumpObject(out,this); | |
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188 AggregateLifeCycle.dump(out,indent,Collections.singletonList(_selectSet)); |
| 865 | 189 } |
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190 |
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191 |
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192 public final class SelectSet implements Dumpable |
| 865 | 193 { |
| 943 | 194 private volatile long _now = System.currentTimeMillis(); |
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195 |
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196 private final SaneSelector _selector; |
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197 |
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198 private SelectSet() throws IOException |
| 865 | 199 { |
| 950 | 200 _selector = new SaneSelector(); |
| 865 | 201 } |
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202 |
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203 private void addChange(SocketChannel channel) |
| 865 | 204 { |
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205 try { |
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206 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq a"); |
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207 // SelectionKey key = _selector.register(channel,SelectionKey.OP_READ,null); |
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208 SelectionKey key = _selector.register(channel,0,null); |
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209 |
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210 SelectChannelEndPoint endpoint = new SelectChannelEndPoint(channel,this,key, _maxIdleTime); |
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211 endpoint.setConnection(newConnection(channel,endpoint)); |
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212 |
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213 key.attach(endpoint); |
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214 key.interestOps(SelectionKey.OP_READ); |
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215 _selector.update(); |
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216 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq b"); |
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217 endpoint.schedule(); |
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218 } catch(IOException e) { |
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219 LOG.warn("",e); |
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220 try { |
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221 channel.close(); |
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222 } catch(IOException e2) { |
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223 LOG.warn("",e2); |
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224 } |
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225 } |
| 865 | 226 } |
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227 |
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228 private void doSelect() throws IOException |
| 865 | 229 { |
| 230 try | |
| 231 { | |
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232 _selector.select(); |
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233 |
| 865 | 234 // Look for things to do |
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235 for (SelectionKey key: _selector.selectedKeys()) |
| 865 | 236 { |
| 237 try | |
| 238 { | |
| 239 if (!key.isValid()) | |
| 240 { | |
| 241 key.cancel(); | |
| 242 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); | |
| 243 if (endpoint != null) | |
| 244 endpoint.doUpdateKey(); | |
| 245 continue; | |
| 246 } | |
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247 |
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248 if (key.isReadable()||key.isWritable()) { |
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249 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); |
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250 endpoint.schedule(); |
| 865 | 251 } |
| 252 } | |
| 253 catch (CancelledKeyException e) | |
| 254 { | |
| 255 LOG.trace("",e); | |
| 256 } | |
| 257 catch (Exception e) | |
| 258 { | |
| 259 if (isRunning()) | |
| 260 LOG.warn("",e); | |
| 261 else | |
| 262 LOG.trace("",e); | |
| 263 } | |
| 264 } | |
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265 |
| 865 | 266 // Everything always handled |
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267 _selector.selectedKeys().clear(); |
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268 |
| 943 | 269 _now = System.currentTimeMillis(); |
| 865 | 270 } |
| 271 catch (ClosedSelectorException e) | |
| 272 { | |
| 273 if (isRunning()) | |
| 274 LOG.warn("",e); | |
| 275 else | |
| 276 LOG.trace("",e); | |
| 277 } | |
| 278 catch (CancelledKeyException e) | |
| 279 { | |
| 280 LOG.trace("",e); | |
| 281 } | |
| 282 } | |
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283 |
| 865 | 284 public SelectorManager getManager() |
| 285 { | |
| 286 return SelectorManager.this; | |
| 287 } | |
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288 |
| 865 | 289 public long getNow() |
| 290 { | |
| 943 | 291 return _now; |
| 865 | 292 } |
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293 |
| 950 | 294 SaneSelector getSelector() |
| 865 | 295 { |
| 296 return _selector; | |
| 297 } | |
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298 |
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299 private synchronized void stop() throws Exception |
| 865 | 300 { |
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301 // close endpoints and selector |
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302 for (SelectionKey key : _selector.keys()) |
| 865 | 303 { |
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304 EndPoint endpoint = (EndPoint)key.attachment(); |
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305 try |
| 865 | 306 { |
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307 endpoint.close(); |
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308 } |
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309 catch(IOException e) |
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310 { |
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311 LOG.trace("",e); |
| 865 | 312 } |
| 313 } | |
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314 |
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315 try |
| 865 | 316 { |
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317 _selector.close(); |
| 865 | 318 } |
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319 catch (IOException e) |
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320 { |
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321 LOG.trace("",e); |
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322 } |
| 865 | 323 } |
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324 |
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325 @Override |
| 865 | 326 public String dump() |
| 327 { | |
| 328 return AggregateLifeCycle.dump(this); | |
| 329 } | |
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330 |
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331 @Override |
| 865 | 332 public void dump(Appendable out, String indent) throws IOException |
| 333 { | |
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334 out.append(String.valueOf(this)).append("\n"); |
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335 AggregateLifeCycle.dump(out,indent,Collections.emptyList()); |
| 865 | 336 } |
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337 |
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338 @Override |
| 865 | 339 public String toString() |
| 340 { | |
| 950 | 341 SaneSelector selector=_selector; |
| 865 | 342 return String.format("%s keys=%d selected=%d", |
| 343 super.toString(), | |
| 344 selector != null && selector.isOpen() ? selector.keys().size() : -1, | |
| 345 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1); | |
| 346 } | |
| 347 } | |
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348 |
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349 } |
