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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 964:768414c16e10

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remove SelectSet
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 14 Oct 2016 01:03:47 -0600
parents 94498d6daf5b
children 0d20943cfea2
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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.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 {
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59 public static final Logger LOG = LoggerFactory.getLogger("org.eclipse.jetty.io.nio");
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60
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61 private final int _maxIdleTime;
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62 private volatile long _now = System.currentTimeMillis();
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63 private SaneSelector _selector;
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64
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65 /* ------------------------------------------------------------ */
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66 /**
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67 * @param maxIdleTime The maximum period in milli seconds that a connection may be idle before it is closed.
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68 * @see #setLowResourcesMaxIdleTime(long)
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69 */
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70 public SelectorManager(int maxIdleTime)
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71 {
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72 _maxIdleTime = maxIdleTime;
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73 }
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74
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75 /* ------------------------------------------------------------ */
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76 /** Register a channel
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77 * @param channel
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78 */
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79 public final void register(SocketChannel channel)
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80 {
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81 /*
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82 SelectSet set = _selectSet;
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83 if (set!=null)
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84 {
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85 set.addChange(channel);
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86 }
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87 */
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88 try {
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89 SelectionKey key = _selector.register(channel,0,null);
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90 SelectChannelEndPoint endpoint = new SelectChannelEndPoint(channel,this,key, _maxIdleTime);
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91 endpoint.setConnection(newConnection(channel,endpoint));
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92 key.attach(endpoint);
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93 _selector.update();
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94 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq b");
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95 endpoint.schedule();
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96 } catch(IOException e) {
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97 LOG.warn("",e);
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98 try {
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99 channel.close();
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100 } catch(IOException e2) {
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101 LOG.warn("",e2);
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102 }
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103 }
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104 }
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105
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106
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107 public abstract void execute(Runnable task);
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108
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109
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110 @Override
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111 protected void doStart() throws Exception
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112 {
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113 _selector = new SaneSelector();
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114
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115 super.doStart();
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116
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117 // start a thread to Select
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118 execute(new Runnable()
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119 {
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120 public void run()
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121 {
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122 String name=Thread.currentThread().getName();
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123 try
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124 {
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125 if (_selector==null)
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126 return;
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127
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128 Thread.currentThread().setName(name+" Selector");
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129 LOG.debug("Starting {} on {}",Thread.currentThread(),this);
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130 while (isRunning())
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131 {
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132 try
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133 {
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134 doSelect();
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135 }
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136 catch(IOException e)
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137 {
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138 LOG.trace("",e);
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139 }
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140 catch(Exception e)
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141 {
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142 LOG.warn("",e);
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143 }
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144 }
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145 }
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146 finally
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147 {
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148 _selector = null;
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149 LOG.debug("Stopped {} on {}",Thread.currentThread(),this);
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150 Thread.currentThread().setName(name);
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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
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158 @Override
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159 protected synchronized void doStop() throws Exception
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160 {
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161 if (_selector!=null)
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162 {
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163 // close endpoints and selector
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164 for (SelectionKey key : _selector.keys())
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165 {
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166 EndPoint endpoint = (EndPoint)key.attachment();
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167 try
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168 {
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169 endpoint.close();
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170 }
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171 catch(IOException e)
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172 {
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173 LOG.trace("",e);
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174 }
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175 }
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176
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177 try
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178 {
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179 _selector.close();
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180 }
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181 catch (IOException e)
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182 {
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183 LOG.trace("",e);
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184 }
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185 }
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186 super.doStop();
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187 }
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188
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189 public abstract AsyncConnection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint);
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190
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191 @Override
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192 public String dump()
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193 {
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194 return AggregateLifeCycle.dump(this);
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195 }
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196
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197 @Override
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198 public void dump(Appendable out, String indent) throws IOException
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199 {
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200 AggregateLifeCycle.dumpObject(out,this);
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201 // AggregateLifeCycle.dump(out,indent,Collections.emptyList());
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202 }
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203
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204
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205 // from SelectSet
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206
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207 private void doSelect() throws IOException
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208 {
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209 try
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210 {
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211 _selector.select();
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212
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213 // Look for things to do
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214 for (SelectionKey key: _selector.selectedKeys())
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215 {
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216 try
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217 {
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218 if (!key.isValid())
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219 {
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220 key.cancel();
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221 continue;
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222 }
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223
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224 if (key.isReadable()||key.isWritable()) {
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225 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment();
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226 endpoint.schedule();
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227 }
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228 }
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229 catch (CancelledKeyException e)
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230 {
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231 // LOG.trace("",e);
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232 LOG.warn("",e);
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233 }
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234 catch (Exception e)
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235 {
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236 LOG.warn("",e);
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237 }
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238 }
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239
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240 // Everything always handled
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241 _selector.selectedKeys().clear();
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242
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243 _now = System.currentTimeMillis();
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244 }
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245 catch (ClosedSelectorException e)
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246 {
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247 if (isRunning())
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248 LOG.warn("",e);
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249 else
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250 LOG.trace("",e);
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251 }
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252 catch (CancelledKeyException e)
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253 {
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254 LOG.trace("",e);
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255 }
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256 }
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257
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258 public final long getNow()
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259 {
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260 return _now;
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261 }
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262
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263 final SaneSelector getSelector()
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264 {
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265 return _selector;
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266 }
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267
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268 @Override
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269 public final String toString()
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270 {
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271 SaneSelector selector=_selector;
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272 return String.format("%s keys=%d selected=%d",
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273 super.toString(),
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274 selector != null && selector.isOpen() ? selector.keys().size() : -1,
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275 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1);
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276 }
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277
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278 }