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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 906:eaf271fb747f

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 07 Oct 2016 03:59:44 -0600
parents 94f5d8a62385
children bc4e299de953
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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.server.nio;
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20
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21 import java.io.IOException;
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22 import java.net.InetSocketAddress;
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23 import java.net.Socket;
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24 import java.nio.channels.SelectionKey;
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25 import java.nio.channels.ServerSocketChannel;
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26 import java.nio.channels.SocketChannel;
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27
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28 import org.eclipse.jetty.continuation.Continuation;
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29 import org.eclipse.jetty.io.AsyncEndPoint;
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30 import org.eclipse.jetty.io.ConnectedEndPoint;
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31 import org.eclipse.jetty.io.Connection;
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32 import org.eclipse.jetty.io.EndPoint;
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33 import org.eclipse.jetty.io.nio.AsyncConnection;
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34 import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
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35 import org.eclipse.jetty.io.nio.SelectorManager;
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36 import org.eclipse.jetty.io.nio.SelectorManager.SelectSet;
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37 import org.eclipse.jetty.server.AsyncHttpConnection;
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38 import org.eclipse.jetty.server.Request;
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39 import org.eclipse.jetty.server.Server;
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40
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41 /* ------------------------------------------------------------------------------- */
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42 /**
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43 * Selecting NIO connector.
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44 * <p>
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45 * This connector uses efficient NIO buffers with a non blocking threading model. Direct NIO buffers
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46 * are used and threads are only allocated to connections with requests. Synchronization is used to
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47 * simulate blocking for the servlet API, and any unflushed content at the end of request handling
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48 * is written asynchronously.
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49 * </p>
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50 * <p>
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51 * This connector is best used when there are a many connections that have idle periods.
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52 * </p>
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53 * <p>
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54 * When used with {@link org.eclipse.jetty.continuation.Continuation}, threadless waits are supported.
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55 * If a filter or servlet returns after calling {@link Continuation#suspend()} or when a
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56 * runtime exception is thrown from a call to {@link Continuation#undispatch()}, Jetty will
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57 * will not send a response to the client. Instead the thread is released and the Continuation is
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58 * placed on the timer queue. If the Continuation timeout expires, or it's
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59 * resume method is called, then the request is again allocated a thread and the request is retried.
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60 * The limitation of this approach is that request content is not available on the retried request,
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61 * thus if possible it should be read after the continuation or saved as a request attribute or as the
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62 * associated object of the Continuation instance.
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63 * </p>
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64 *
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65 * @org.apache.xbean.XBean element="nioConnector" description="Creates an NIO based socket connector"
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66 */
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67 public class SelectChannelConnector extends AbstractNIOConnector
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68 {
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69 private transient ServerSocketChannel _acceptChannel;
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70 private int _lowResourcesConnections;
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71 private int _lowResourcesMaxIdleTime;
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72 private int _localPort=-1;
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73
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74 private final SelectorManager _manager = new ConnectorSelectorManager();
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75
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76 /* ------------------------------------------------------------------------------- */
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77 /**
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78 * Constructor.
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79 *
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80 */
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81 public SelectChannelConnector(Server server,int port)
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82 {
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83 super(server,port);
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84 _manager.setMaxIdleTime(getMaxIdleTime());
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85 addBean(_manager,true);
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86 setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4));
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 @Override
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91 public final void accept() throws IOException
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92 {
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93 ServerSocketChannel server = _acceptChannel;
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94
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95 if (server!=null && server.isOpen() && _manager.isStarted())
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96 {
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97 SocketChannel channel = server.accept();
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98 channel.configureBlocking(false);
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99 Socket socket = channel.socket();
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100 configure(socket);
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101 _manager.register(channel);
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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 public void close() throws IOException
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107 {
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108 synchronized(this)
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109 {
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110 if (_acceptChannel != null)
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111 {
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112 removeBean(_acceptChannel);
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113 if (_acceptChannel.isOpen())
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114 _acceptChannel.close();
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115 }
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116 _acceptChannel = null;
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117 _localPort=-2;
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118 }
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119 }
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120
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121 /* ------------------------------------------------------------------------------- */
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122 @Override
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123 public void customize(EndPoint endpoint, Request request) throws IOException
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124 {
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125 request.setTimeStamp(System.currentTimeMillis());
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126 endpoint.setMaxIdleTime(_maxIdleTime);
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127 super.customize(endpoint, request);
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128 }
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129
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130 /* ------------------------------------------------------------------------------- */
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131 @Override
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132 public void persist(EndPoint endpoint) throws IOException
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133 {
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134 AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint);
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135 aEndp.setCheckForIdle(true);
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136 super.persist(endpoint);
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137 }
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138
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139 /* ------------------------------------------------------------ */
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140 public SelectorManager getSelectorManager()
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141 {
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142 return _manager;
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143 }
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144
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145 /* ------------------------------------------------------------ */
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146 public synchronized Object getConnection()
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147 {
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148 return _acceptChannel;
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149 }
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150
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151 /* ------------------------------------------------------------------------------- */
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152 public int getLocalPort()
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153 {
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154 synchronized(this)
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155 {
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156 return _localPort;
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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 public void open() throws IOException
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162 {
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163 synchronized(this)
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164 {
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165 if (_acceptChannel == null)
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166 {
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167 // Create a new server socket
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168 _acceptChannel = ServerSocketChannel.open();
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169 // Set to blocking mode
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170 _acceptChannel.configureBlocking(true);
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171
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172 // Bind the server socket to the local host and port
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173 _acceptChannel.socket().setReuseAddress(true);
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174 InetSocketAddress addr = getHost()==null?new InetSocketAddress(port):new InetSocketAddress(getHost(),port);
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175 _acceptChannel.socket().bind(addr);
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176
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177 _localPort=_acceptChannel.socket().getLocalPort();
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178 if (_localPort<=0)
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179 throw new IOException("Server channel not bound");
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180
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181 addBean(_acceptChannel);
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182 }
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183 }
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184 }
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185
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186 /* ------------------------------------------------------------ */
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187 @Override
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188 public void setMaxIdleTime(int maxIdleTime)
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189 {
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190 _manager.setMaxIdleTime(maxIdleTime);
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191 super.setMaxIdleTime(maxIdleTime);
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192 }
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193
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194 /* ------------------------------------------------------------ */
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195 /**
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196 * @return the lowResourcesConnections
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197 */
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198 public int getLowResourcesConnections()
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199 {
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200 return _lowResourcesConnections;
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201 }
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202
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203 /* ------------------------------------------------------------ */
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204 /**
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205 * Set the number of connections, which if exceeded places this manager in low resources state.
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206 * This is not an exact measure as the connection count is averaged over the select sets.
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207 * @param lowResourcesConnections the number of connections
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208 * @see #setLowResourcesMaxIdleTime(int)
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209 */
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210 public void setLowResourcesConnections(int lowResourcesConnections)
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211 {
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212 _lowResourcesConnections=lowResourcesConnections;
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213 }
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214
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215 /* ------------------------------------------------------------ */
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216 /**
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217 * @return the lowResourcesMaxIdleTime
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218 */
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219 @Override
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220 public int getLowResourcesMaxIdleTime()
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221 {
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222 return _lowResourcesMaxIdleTime;
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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 * Set the period in ms that a connection is allowed to be idle when this there are more
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228 * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections
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229 * in order to gracefully handle high load situations.
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230 * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low.
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231 * @see #setMaxIdleTime(int)
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232 */
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233 @Override
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234 public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime)
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235 {
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236 _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime;
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237 super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime);
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238 }
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239
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240
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241 /* ------------------------------------------------------------ */
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242 /*
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243 * @see org.eclipse.jetty.server.server.AbstractConnector#doStart()
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244 */
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245 @Override
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246 protected void doStart() throws Exception
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247 {
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248 _manager.setSelectSets(getAcceptors());
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249 _manager.setMaxIdleTime(getMaxIdleTime());
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250 _manager.setLowResourcesConnections(getLowResourcesConnections());
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251 _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime());
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252
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253 super.doStart();
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254 }
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255
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256 /* ------------------------------------------------------------ */
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257 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
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258 {
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259 SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime);
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260 endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment()));
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261 return endp;
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262 }
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263
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264 /* ------------------------------------------------------------------------------- */
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265 protected void endPointClosed(SelectChannelEndPoint endpoint)
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266 {
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267 endpoint.getConnection().onClose();
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268 }
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269
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270 /* ------------------------------------------------------------------------------- */
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271 protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint)
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272 {
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273 return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,server);
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274 }
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275
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276
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277 /* ------------------------------------------------------------ */
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278 /* ------------------------------------------------------------ */
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279 /* ------------------------------------------------------------ */
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280 private final class ConnectorSelectorManager extends SelectorManager
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281 {
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282 @Override
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283 public void execute(Runnable task)
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284 {
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285 server.threadPool.execute(task);
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286 }
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287
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288 @Override
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289 protected void endPointClosed(final SelectChannelEndPoint endpoint)
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290 {
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291 SelectChannelConnector.this.endPointClosed(endpoint);
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292 }
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293
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294 @Override
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295 protected void endPointOpened(SelectChannelEndPoint endpoint)
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296 {
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297 }
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298
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299 @Override
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300 protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection)
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301 {
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302 }
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303
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304 @Override
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305 public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment)
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306 {
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307 return SelectChannelConnector.this.newConnection(channel,endpoint);
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308 }
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309
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310 @Override
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311 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException
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312 {
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313 return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey);
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314 }
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315 }
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316 }