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annotate src/org/eclipse/jetty/io/nio/SelectorManager.java @ 958:fc521d2f098e

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simplify SelectorManager
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 13 Oct 2016 18:48:20 -0600
parents d6b6d3e40161
children 7b94f5b33c64
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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 int _maxIdleTime;
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62 private long _lowResourcesConnections;
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63 private SelectSet _selectSet;
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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 void setMaxIdleTime(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 void register(SocketChannel channel)
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80 {
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81 SelectSet set = _selectSet;
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82 if (set!=null)
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83 {
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84 set.addChange(channel);
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85 }
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86 }
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87
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88 /* ------------------------------------------------------------ */
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89 /**
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90 * @return the lowResourcesConnections
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91 */
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92 public long getLowResourcesConnections()
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93 {
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94 return _lowResourcesConnections;
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95 }
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96
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97 /* ------------------------------------------------------------ */
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98 /**
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99 * Set the number of connections, which if exceeded places this manager in low resources state.
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100 * This is not an exact measure as the connection count is averaged over the select sets.
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101 * @param lowResourcesConnections the number of connections
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102 * @see #setLowResourcesMaxIdleTime(long)
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103 */
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104 public void setLowResourcesConnections(long lowResourcesConnections)
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105 {
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106 _lowResourcesConnections = lowResourcesConnections;
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107 }
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108
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109
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110 public abstract void execute(Runnable task);
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111
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112 /* ------------------------------------------------------------ */
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113 /* (non-Javadoc)
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114 * @see org.eclipse.component.AbstractLifeCycle#doStart()
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115 */
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116 @Override
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117 protected void doStart() throws Exception
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118 {
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119 _selectSet = new SelectSet();
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120
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121 super.doStart();
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122
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123 // start a thread to Select
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124 execute(new Runnable()
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125 {
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126 public void run()
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127 {
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128 String name=Thread.currentThread().getName();
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129 try
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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
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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);
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150 }
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151 }
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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 });
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161 }
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162
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163
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164 /* ------------------------------------------------------------------------------- */
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165 @Override
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166 protected void doStop() throws Exception
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167 {
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168 SelectSet set = _selectSet;
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169 _selectSet = null;
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170 if (set!=null)
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171 {
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172 set.stop();
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173 }
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174 super.doStop();
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175 }
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176
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177 public abstract AsyncConnection newConnection(SocketChannel channel, SelectChannelEndPoint endpoint);
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178
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179 public String dump()
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180 {
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181 return AggregateLifeCycle.dump(this);
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182 }
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183
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184 public void dump(Appendable out, String indent) throws IOException
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185 {
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186 AggregateLifeCycle.dumpObject(out,this);
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187 AggregateLifeCycle.dump(out,indent,Collections.singletonList(_selectSet));
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188 }
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189
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190
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191 public final class SelectSet implements Dumpable
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192 {
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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
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197 private SelectSet() throws IOException
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198 {
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199 _selector = new SaneSelector();
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200 }
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201
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202 private void addChange(SocketChannel channel)
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203 {
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204 try {
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205 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq a");
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206 // SelectionKey key = _selector.register(channel,SelectionKey.OP_READ,null);
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207 SelectionKey key = _selector.register(channel,0,null);
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208
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209 SelectChannelEndPoint endpoint = new SelectChannelEndPoint(channel,this,key, _maxIdleTime);
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210 endpoint.setConnection(newConnection(channel,endpoint));
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211
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212 key.attach(endpoint);
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213 key.interestOps(SelectionKey.OP_READ);
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214 _selector.update();
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215 //System.out.println("qqqqqqqqqqqqqqqqqqqqqqqqqqqqq b");
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216 endpoint.schedule();
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217 } catch(IOException e) {
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218 LOG.warn("",e);
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219 try {
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220 channel.close();
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221 } catch(IOException e2) {
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222 LOG.warn("",e2);
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223 }
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224 }
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225 }
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226
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227 private void doSelect() throws IOException
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228 {
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229 try
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230 {
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231 _selector.select();
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232
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233 // Look for things to do
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234 for (SelectionKey key: _selector.selectedKeys())
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235 {
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236 try
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237 {
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238 if (!key.isValid())
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239 {
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240 key.cancel();
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diff changeset
241 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment();
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242 if (endpoint != null)
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diff changeset
243 endpoint.doUpdateKey();
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244 continue;
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245 }
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246
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247 if (key.isReadable()||key.isWritable()) {
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248 SelectChannelEndPoint endpoint = (SelectChannelEndPoint)key.attachment();
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249 endpoint.schedule();
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250 }
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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 catch (Exception e)
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257 {
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258 if (isRunning())
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259 LOG.warn("",e);
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260 else
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261 LOG.trace("",e);
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262 }
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263 }
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264
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diff changeset
265 // Everything always handled
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a021c4c9c244 use just one SelectSet per SelectorManager
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266 _selector.selectedKeys().clear();
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267
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268 _now = System.currentTimeMillis();
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269 }
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270 catch (ClosedSelectorException e)
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271 {
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272 if (isRunning())
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273 LOG.warn("",e);
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274 else
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275 LOG.trace("",e);
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276 }
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277 catch (CancelledKeyException e)
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278 {
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279 LOG.trace("",e);
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280 }
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281 }
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282
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283 public SelectorManager getManager()
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284 {
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285 return SelectorManager.this;
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286 }
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287
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diff changeset
288 public long getNow()
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289 {
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290 return _now;
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diff changeset
291 }
951
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292
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diff changeset
293 public void destroyEndPoint(SelectChannelEndPoint endp)
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294 {
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295 LOG.debug("destroyEndPoint {}",endp);
948
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diff changeset
296 endp.getConnection().onClose();
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297 }
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298
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diff changeset
299 SaneSelector getSelector()
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diff changeset
300 {
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301 return _selector;
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diff changeset
302 }
802
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303
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304 synchronized void stop() throws Exception
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diff changeset
305 {
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diff changeset
306 // close endpoints and selector
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diff changeset
307 for (SelectionKey key : _selector.keys())
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diff changeset
308 {
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a021c4c9c244 use just one SelectSet per SelectorManager
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diff changeset
309 EndPoint endpoint = (EndPoint)key.attachment();
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diff changeset
310 try
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diff changeset
311 {
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a021c4c9c244 use just one SelectSet per SelectorManager
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diff changeset
312 endpoint.close();
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313 }
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diff changeset
314 catch(IOException e)
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diff changeset
315 {
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diff changeset
316 LOG.trace("",e);
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diff changeset
317 }
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diff changeset
318 }
953
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diff changeset
319
7db4a488fc82 simplify SelectorManager
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diff changeset
320 try
865
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diff changeset
321 {
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7db4a488fc82 simplify SelectorManager
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diff changeset
322 _selector.close();
865
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diff changeset
323 }
953
7db4a488fc82 simplify SelectorManager
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diff changeset
324 catch (IOException e)
7db4a488fc82 simplify SelectorManager
Franklin Schmidt <fschmidt@gmail.com>
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diff changeset
325 {
7db4a488fc82 simplify SelectorManager
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diff changeset
326 LOG.trace("",e);
7db4a488fc82 simplify SelectorManager
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diff changeset
327 }
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diff changeset
328 }
802
3428c60d7cfc replace jetty jars with source
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329
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diff changeset
330 public String dump()
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diff changeset
331 {
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diff changeset
332 return AggregateLifeCycle.dump(this);
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diff changeset
333 }
802
3428c60d7cfc replace jetty jars with source
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diff changeset
334
865
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diff changeset
335 public void dump(Appendable out, String indent) throws IOException
6b210bb66c63 remove ThreadPool
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parents: 820
diff changeset
336 {
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337 out.append(String.valueOf(this)).append("\n");
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338 AggregateLifeCycle.dump(out,indent,Collections.emptyList());
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339 }
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340
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341 public String toString()
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342 {
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343 SaneSelector selector=_selector;
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344 return String.format("%s keys=%d selected=%d",
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345 super.toString(),
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346 selector != null && selector.isOpen() ? selector.keys().size() : -1,
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347 selector != null && selector.isOpen() ? selector.selectedKeys().size() : -1);
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348 }
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349 }
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350
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351 }