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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 874:ad495e897c32

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 04 Oct 2016 13:34:23 -0600
parents 6b210bb66c63
children df84a1741687
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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
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40 /* ------------------------------------------------------------------------------- */
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41 /**
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42 * Selecting NIO connector.
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43 * <p>
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44 * This connector uses efficient NIO buffers with a non blocking threading model. Direct NIO buffers
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45 * are used and threads are only allocated to connections with requests. Synchronization is used to
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46 * simulate blocking for the servlet API, and any unflushed content at the end of request handling
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47 * is written asynchronously.
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48 * </p>
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49 * <p>
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50 * This connector is best used when there are a many connections that have idle periods.
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51 * </p>
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52 * <p>
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53 * When used with {@link org.eclipse.jetty.continuation.Continuation}, threadless waits are supported.
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54 * If a filter or servlet returns after calling {@link Continuation#suspend()} or when a
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55 * runtime exception is thrown from a call to {@link Continuation#undispatch()}, Jetty will
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56 * will not send a response to the client. Instead the thread is released and the Continuation is
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57 * placed on the timer queue. If the Continuation timeout expires, or it's
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58 * resume method is called, then the request is again allocated a thread and the request is retried.
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59 * The limitation of this approach is that request content is not available on the retried request,
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60 * thus if possible it should be read after the continuation or saved as a request attribute or as the
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61 * associated object of the Continuation instance.
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62 * </p>
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63 *
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64 * @org.apache.xbean.XBean element="nioConnector" description="Creates an NIO based socket connector"
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65 */
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66 public class SelectChannelConnector extends AbstractNIOConnector
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67 {
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68 protected ServerSocketChannel _acceptChannel;
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69 private int _lowResourcesConnections;
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70 private int _lowResourcesMaxIdleTime;
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71 private int _localPort=-1;
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72
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73 private final SelectorManager _manager = new ConnectorSelectorManager();
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74
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75 /* ------------------------------------------------------------------------------- */
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76 /**
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77 * Constructor.
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78 *
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79 */
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80 public SelectChannelConnector()
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81 {
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82 _manager.setMaxIdleTime(getMaxIdleTime());
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83 addBean(_manager,true);
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84 setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4));
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85 }
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86
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87 /* ------------------------------------------------------------ */
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88 @Override
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89 public void accept(int acceptorID) throws IOException
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90 {
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91 ServerSocketChannel server;
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92 synchronized(this)
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93 {
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94 server = _acceptChannel;
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95 }
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96
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97 if (server!=null && server.isOpen() && _manager.isStarted())
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98 {
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99 SocketChannel channel = server.accept();
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100 channel.configureBlocking(false);
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101 Socket socket = channel.socket();
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102 configure(socket);
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103 _manager.register(channel);
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104 }
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105 }
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106
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107 /* ------------------------------------------------------------ */
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108 public void close() throws IOException
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109 {
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110 synchronized(this)
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111 {
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112 if (_acceptChannel != null)
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113 {
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114 removeBean(_acceptChannel);
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115 if (_acceptChannel.isOpen())
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116 _acceptChannel.close();
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117 }
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118 _acceptChannel = null;
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119 _localPort=-2;
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120 }
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121 }
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122
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123 /* ------------------------------------------------------------------------------- */
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124 @Override
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125 public void customize(EndPoint endpoint, Request request) throws IOException
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126 {
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127 request.setTimeStamp(System.currentTimeMillis());
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128 endpoint.setMaxIdleTime(_maxIdleTime);
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129 super.customize(endpoint, request);
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130 }
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131
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132 /* ------------------------------------------------------------------------------- */
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133 @Override
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134 public void persist(EndPoint endpoint) throws IOException
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135 {
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136 AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint);
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137 aEndp.setCheckForIdle(true);
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138 super.persist(endpoint);
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139 }
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140
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141 /* ------------------------------------------------------------ */
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142 public SelectorManager getSelectorManager()
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143 {
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144 return _manager;
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145 }
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146
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147 /* ------------------------------------------------------------ */
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148 public synchronized Object getConnection()
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149 {
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150 return _acceptChannel;
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151 }
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152
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153 /* ------------------------------------------------------------------------------- */
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154 public int getLocalPort()
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155 {
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156 synchronized(this)
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157 {
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158 return _localPort;
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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 public void open() throws IOException
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164 {
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165 synchronized(this)
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166 {
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167 if (_acceptChannel == null)
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168 {
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169 // Create a new server socket
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170 _acceptChannel = ServerSocketChannel.open();
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171 // Set to blocking mode
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172 _acceptChannel.configureBlocking(true);
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173
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174 // Bind the server socket to the local host and port
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175 _acceptChannel.socket().setReuseAddress(getReuseAddress());
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176 InetSocketAddress addr = getHost()==null?new InetSocketAddress(getPort()):new InetSocketAddress(getHost(),getPort());
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177 _acceptChannel.socket().bind(addr,getAcceptQueueSize());
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178
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179 _localPort=_acceptChannel.socket().getLocalPort();
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180 if (_localPort<=0)
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181 throw new IOException("Server channel not bound");
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182
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183 addBean(_acceptChannel);
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184 }
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185 }
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186 }
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187
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188 /* ------------------------------------------------------------ */
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189 @Override
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190 public void setMaxIdleTime(int maxIdleTime)
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191 {
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192 _manager.setMaxIdleTime(maxIdleTime);
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193 super.setMaxIdleTime(maxIdleTime);
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194 }
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195
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196 /* ------------------------------------------------------------ */
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197 /**
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198 * @return the lowResourcesConnections
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199 */
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200 public int getLowResourcesConnections()
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201 {
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202 return _lowResourcesConnections;
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203 }
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204
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205 /* ------------------------------------------------------------ */
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206 /**
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207 * Set the number of connections, which if exceeded places this manager in low resources state.
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208 * This is not an exact measure as the connection count is averaged over the select sets.
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209 * @param lowResourcesConnections the number of connections
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210 * @see #setLowResourcesMaxIdleTime(int)
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211 */
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212 public void setLowResourcesConnections(int lowResourcesConnections)
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213 {
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214 _lowResourcesConnections=lowResourcesConnections;
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215 }
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216
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217 /* ------------------------------------------------------------ */
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218 /**
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219 * @return the lowResourcesMaxIdleTime
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220 */
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221 @Override
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222 public int getLowResourcesMaxIdleTime()
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223 {
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224 return _lowResourcesMaxIdleTime;
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225 }
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226
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227 /* ------------------------------------------------------------ */
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228 /**
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229 * Set the period in ms that a connection is allowed to be idle when this there are more
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230 * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections
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231 * in order to gracefully handle high load situations.
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232 * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low.
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233 * @see #setMaxIdleTime(int)
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234 */
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235 @Override
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236 public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime)
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237 {
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238 _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime;
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239 super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime);
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240 }
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241
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242
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243 /* ------------------------------------------------------------ */
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244 /*
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245 * @see org.eclipse.jetty.server.server.AbstractConnector#doStart()
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246 */
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247 @Override
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248 protected void doStart() throws Exception
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249 {
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250 _manager.setSelectSets(getAcceptors());
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251 _manager.setMaxIdleTime(getMaxIdleTime());
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252 _manager.setLowResourcesConnections(getLowResourcesConnections());
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253 _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime());
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254
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255 super.doStart();
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256 }
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257
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258 /* ------------------------------------------------------------ */
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259 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
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260 {
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261 SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime);
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262 endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment()));
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263 return endp;
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264 }
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265
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266 /* ------------------------------------------------------------------------------- */
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267 protected void endPointClosed(SelectChannelEndPoint endpoint)
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268 {
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269 connectionClosed(endpoint.getConnection());
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270 }
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271
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272 /* ------------------------------------------------------------------------------- */
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273 protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint)
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274 {
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275 return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,getServer());
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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 /* ------------------------------------------------------------ */
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281 /* ------------------------------------------------------------ */
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282 private final class ConnectorSelectorManager extends SelectorManager
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283 {
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284 @Override
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285 public void execute(Runnable task)
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286 {
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287 getThreadPool().execute(task);
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288 }
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289
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290 @Override
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291 protected void endPointClosed(final SelectChannelEndPoint endpoint)
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292 {
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293 SelectChannelConnector.this.endPointClosed(endpoint);
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294 }
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295
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296 @Override
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297 protected void endPointOpened(SelectChannelEndPoint endpoint)
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298 {
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299 // TODO handle max connections and low resources
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300 connectionOpened(endpoint.getConnection());
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301 }
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302
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303 @Override
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304 protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection)
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305 {
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306 connectionUpgraded(oldConnection,endpoint.getConnection());
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307 }
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308
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309 @Override
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310 public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment)
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311 {
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312 return SelectChannelConnector.this.newConnection(channel,endpoint);
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313 }
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314
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315 @Override
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316 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException
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317 {
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318 return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey);
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319 }
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320 }
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321 }