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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 1036:b87f97f6418a

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 03 Nov 2016 21:42:41 -0600
parents 5ee36654b383
children
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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.EndPoint;
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40 import org.eclipse.jetty.util.TypeUtil;
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41 import org.eclipse.jetty.util.component.AbstractLifeCycle;
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42 import org.eclipse.jetty.util.component.AggregateLifeCycle;
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43 import org.eclipse.jetty.util.component.Dumpable;
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44 import org.eclipse.jetty.server.nio.SelectChannelConnector;
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45 import org.slf4j.Logger;
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46 import org.slf4j.LoggerFactory;
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47
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48
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49 /* ------------------------------------------------------------ */
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50 /**
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51 * The Selector Manager manages and number of SelectSets to allow
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52 * NIO scheduling to scale to large numbers of connections.
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53 * <p>
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54 */
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55 public final class SelectorManager extends AbstractLifeCycle implements Dumpable
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56 {
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57 public static final Logger LOG = LoggerFactory.getLogger("org.eclipse.jetty.io.nio");
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58
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59 private final SelectChannelConnector scc;
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60 private volatile long _now = System.currentTimeMillis();
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61 private SaneSelector _selector;
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62
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63 /* ------------------------------------------------------------ */
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64 /**
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65 * @param maxIdleTime The maximum period in milli seconds that a connection may be idle before it is closed.
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66 * @see #setLowResourcesMaxIdleTime(long)
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67 */
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68 public SelectorManager(SelectChannelConnector scc)
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69 {
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70 this.scc = scc;
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71 }
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72
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73 /* ------------------------------------------------------------ */
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74 /** Register a channel
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75 * @param channel
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76 */
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77 public final void register(SocketChannel channel)
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78 {
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79 /*
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80 SelectSet set = _selectSet;
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81 if (set!=null)
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82 {
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83 set.addChange(channel);
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84 }
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85 */
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86 try {
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87 SelectionKey key = _selector.register(channel,0,null);
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88 SelectChannelEndPoint endpoint = new SelectChannelEndPoint(channel,this,key, scc.getMaxIdleTime());
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89 key.attach(endpoint);
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90 _selector.update();
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91 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq b");
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92 endpoint.schedule();
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93 } catch(IOException e) {
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94 LOG.warn("",e);
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95 try {
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96 channel.close();
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97 } catch(IOException e2) {
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98 LOG.warn("",e2);
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99 }
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100 }
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101 }
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102
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103
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104 public void execute(Runnable task) {
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105 scc.server.threadPool.execute(task);
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106 }
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107
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108
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109 @Override
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110 protected void doStart() throws Exception
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111 {
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112 _selector = new SaneSelector();
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113
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114 super.doStart();
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115
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116 // start a thread to Select
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117 execute(new Runnable()
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118 {
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119 public void run()
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120 {
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121 String name=Thread.currentThread().getName();
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122 try
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123 {
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124 if (_selector==null)
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125 return;
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126
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127 Thread.currentThread().setName(name+" Selector");
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128 LOG.debug("Starting {} on {}",Thread.currentThread(),this);
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129 while (isRunning())
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130 {
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131 try
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132 {
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133 doSelect();
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134 }
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135 catch(IOException e)
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136 {
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137 LOG.trace("",e);
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138 }
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139 catch(Exception e)
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140 {
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141 LOG.warn("",e);
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142 }
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143 }
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144 }
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145 finally
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146 {
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147 _selector = null;
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148 LOG.debug("Stopped {} on {}",Thread.currentThread(),this);
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149 Thread.currentThread().setName(name);
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150 }
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151 }
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152
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153 });
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154 }
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155
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156
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157 @Override
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158 protected synchronized void doStop() throws Exception
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159 {
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160 if (_selector!=null)
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161 {
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162 // close endpoints and selector
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163 for (SelectionKey key : _selector.keys())
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164 {
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165 EndPoint endpoint = (EndPoint)key.attachment();
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166 try
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167 {
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168 endpoint.close();
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169 }
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170 catch(IOException e)
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171 {
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172 LOG.trace("",e);
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173 }
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174 }
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175
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176 try
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177 {
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178 _selector.close();
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179 }
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180 catch (IOException e)
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181 {
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182 LOG.trace("",e);
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183 }
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184 }
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185 super.doStop();
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186 }
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187
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188 public AsyncConnection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint) {
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189 return scc.newConnection(channel,endpoint);
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190 }
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191
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192 @Override
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193 public String dump()
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194 {
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195 return AggregateLifeCycle.dump(this);
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196 }
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197
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198 @Override
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199 public void dump(Appendable out, String indent) throws IOException
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200 {
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201 AggregateLifeCycle.dumpObject(out,this);
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202 // AggregateLifeCycle.dump(out,indent,Collections.emptyList());
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203 }
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204
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205
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206 // from SelectSet
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207
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208 private void doSelect() throws IOException
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209 {
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210 try
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211 {
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212 _selector.select();
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213
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214 // Look for things to do
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215 for (SelectionKey key: _selector.selectedKeys())
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216 {
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217 try
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218 {
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219 if (!key.isValid())
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220 {
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221 key.cancel();
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222 continue;
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223 }
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224
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225 if (key.isReadable()||key.isWritable()) {
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226 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment();
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227 endpoint.schedule();
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228 }
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229 }
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230 catch (CancelledKeyException e)
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231 {
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232 // LOG.trace("",e);
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233 LOG.warn("",e);
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234 }
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235 catch (Exception e)
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236 {
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237 LOG.warn("",e);
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238 }
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239 }
953
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240
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241 // Everything always handled
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242 _selector.selectedKeys().clear();
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243
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244 _now = System.currentTimeMillis();
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245 }
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246 catch (ClosedSelectorException e)
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247 {
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248 if (isRunning())
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249 LOG.warn("",e);
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250 else
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251 LOG.trace("",e);
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252 }
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253 catch (CancelledKeyException e)
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254 {
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255 LOG.trace("",e);
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256 }
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257 }
802
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258
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diff changeset
259 public final long getNow()
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260 {
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261 return _now;
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262 }
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263
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264 final SaneSelector getSelector()
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265 {
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266 return _selector;
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267 }
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268
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269 @Override
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diff changeset
270 public final String toString()
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271 {
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272 SaneSelector selector=_selector;
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273 return String.format("%s keys=%d selected=%d",
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diff changeset
274 super.toString(),
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diff changeset
275 selector != null && selector.isOpen() ? selector.keys().size() : -1,
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diff changeset
276 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1);
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277 }
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278
802
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279 }