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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 954:a021c4c9c244
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 13 Oct 2016 00:54:10 -0600 |
parents | 7db4a488fc82 |
children | d6b6d3e40161 |
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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 /* ------------------------------------------------------------------------------- */ |
165 @Override | |
166 protected void doStop() throws Exception | |
167 { | |
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168 SelectSet set = _selectSet; |
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169 _selectSet = null; |
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170 if (set!=null) |
865 | 171 { |
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172 set.stop(); |
865 | 173 } |
174 super.doStop(); | |
175 } | |
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176 |
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177 public abstract AsyncConnection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint, Object attachment); |
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178 |
865 | 179 public String dump() |
180 { | |
181 return AggregateLifeCycle.dump(this); | |
182 } | |
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183 |
865 | 184 public void dump(Appendable out, String indent) throws IOException |
185 { | |
186 AggregateLifeCycle.dumpObject(out,this); | |
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187 AggregateLifeCycle.dump(out,indent,Collections.singletonList(_selectSet)); |
865 | 188 } |
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189 |
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190 |
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191 public final class SelectSet implements Dumpable |
865 | 192 { |
943 | 193 private volatile long _now = System.currentTimeMillis(); |
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194 |
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195 private final SaneSelector _selector; |
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196 |
865 | 197 private ConcurrentMap<SelectChannelEndPoint,Object> _endPoints = new ConcurrentHashMap<SelectChannelEndPoint, Object>(); |
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198 |
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199 SelectSet() throws IOException |
865 | 200 { |
950 | 201 _selector = new SaneSelector(); |
865 | 202 } |
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203 |
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204 private void addChange(SocketChannel channel) |
865 | 205 { |
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206 try { |
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207 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq a"); |
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208 // SelectionKey key = _selector.register(channel,SelectionKey.OP_READ,null); |
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209 SelectionKey key = _selector.register(channel,0,null); |
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210 SelectChannelEndPoint endpoint = createEndPoint(channel,key); |
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211 key.attach(endpoint); |
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212 key.interestOps(SelectionKey.OP_READ); |
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213 _selector.update(); |
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214 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq b"); |
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215 endpoint.schedule(); |
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216 } catch(IOException e) { |
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217 LOG.warn("",e); |
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218 try { |
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219 channel.close(); |
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220 } catch(IOException e2) { |
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221 LOG.warn("",e2); |
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222 } |
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223 } |
865 | 224 } |
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225 |
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226 private void doSelect() throws IOException |
865 | 227 { |
228 try | |
229 { | |
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230 _selector.select(); |
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231 |
865 | 232 // Look for things to do |
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233 for (SelectionKey key: _selector.selectedKeys()) |
865 | 234 { |
235 try | |
236 { | |
237 if (!key.isValid()) | |
238 { | |
239 key.cancel(); | |
240 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); | |
241 if (endpoint != null) | |
242 endpoint.doUpdateKey(); | |
243 continue; | |
244 } | |
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245 |
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246 if (key.isReadable()||key.isWritable()) { |
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247 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment(); |
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248 endpoint.schedule(); |
865 | 249 } |
250 } | |
251 catch (CancelledKeyException e) | |
252 { | |
253 LOG.trace("",e); | |
254 } | |
255 catch (Exception e) | |
256 { | |
257 if (isRunning()) | |
258 LOG.warn("",e); | |
259 else | |
260 LOG.trace("",e); | |
261 } | |
262 } | |
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263 |
865 | 264 // Everything always handled |
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265 _selector.selectedKeys().clear(); |
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266 |
943 | 267 _now = System.currentTimeMillis(); |
865 | 268 } |
269 catch (ClosedSelectorException e) | |
270 { | |
271 if (isRunning()) | |
272 LOG.warn("",e); | |
273 else | |
274 LOG.trace("",e); | |
275 } | |
276 catch (CancelledKeyException e) | |
277 { | |
278 LOG.trace("",e); | |
279 } | |
280 } | |
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281 |
865 | 282 public SelectorManager getManager() |
283 { | |
284 return SelectorManager.this; | |
285 } | |
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286 |
865 | 287 public long getNow() |
288 { | |
943 | 289 return _now; |
865 | 290 } |
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291 |
865 | 292 private SelectChannelEndPoint createEndPoint(SocketChannel channel, SelectionKey sKey) throws IOException |
293 { | |
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294 SelectChannelEndPoint endp = new SelectChannelEndPoint(channel,this,sKey, _maxIdleTime); |
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295 endp.setConnection(getManager().newConnection(channel,endp, sKey.attachment())); |
865 | 296 LOG.debug("created {}",endp); |
297 _endPoints.put(endp,this); | |
298 return endp; | |
299 } | |
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300 |
865 | 301 public void destroyEndPoint(SelectChannelEndPoint endp) |
302 { | |
303 LOG.debug("destroyEndPoint {}",endp); | |
304 _endPoints.remove(endp); | |
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305 endp.getConnection().onClose(); |
865 | 306 } |
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307 |
950 | 308 SaneSelector getSelector() |
865 | 309 { |
310 return _selector; | |
311 } | |
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312 |
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313 synchronized void stop() throws Exception |
865 | 314 { |
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315 // close endpoints and selector |
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316 for (SelectionKey key : _selector.keys()) |
865 | 317 { |
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318 EndPoint endpoint = (EndPoint)key.attachment(); |
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319 try |
865 | 320 { |
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321 endpoint.close(); |
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322 } |
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323 catch(IOException e) |
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324 { |
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325 LOG.trace("",e); |
865 | 326 } |
327 } | |
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328 |
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329 try |
865 | 330 { |
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331 _selector.close(); |
865 | 332 } |
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333 catch (IOException e) |
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334 { |
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335 LOG.trace("",e); |
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336 } |
865 | 337 } |
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338 |
865 | 339 public String dump() |
340 { | |
341 return AggregateLifeCycle.dump(this); | |
342 } | |
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343 |
865 | 344 public void dump(Appendable out, String indent) throws IOException |
345 { | |
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346 out.append(String.valueOf(this)).append("\n"); |
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347 AggregateLifeCycle.dump(out,indent,Collections.emptyList()); |
865 | 348 } |
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349 |
865 | 350 public String toString() |
351 { | |
950 | 352 SaneSelector selector=_selector; |
865 | 353 return String.format("%s keys=%d selected=%d", |
354 super.toString(), | |
355 selector != null && selector.isOpen() ? selector.keys().size() : -1, | |
356 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1); | |
357 } | |
358 } | |
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359 |
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360 } |