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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 854:359012f4e797

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 20 Sep 2016 01:05:37 -0600
parents 3428c60d7cfc
children e21ca9878a10
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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.util.thread.ThreadPool;
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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 protected 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()
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82 {
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83 _manager.setMaxIdleTime(getMaxIdleTime());
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84 addBean(_manager,true);
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85 setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4));
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86 }
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87
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88 @Override
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89 public void setThreadPool(ThreadPool pool)
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90 {
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91 super.setThreadPool(pool);
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92 // preserve start order
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93 removeBean(_manager);
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94 addBean(_manager,true);
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95 }
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96
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97 /* ------------------------------------------------------------ */
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98 @Override
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99 public void accept(int acceptorID) throws IOException
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100 {
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101 ServerSocketChannel server;
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102 synchronized(this)
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103 {
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104 server = _acceptChannel;
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105 }
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106
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107 if (server!=null && server.isOpen() && _manager.isStarted())
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108 {
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109 SocketChannel channel = server.accept();
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110 channel.configureBlocking(false);
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111 Socket socket = channel.socket();
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112 configure(socket);
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113 _manager.register(channel);
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114 }
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115 }
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116
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117 /* ------------------------------------------------------------ */
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118 public void close() throws IOException
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119 {
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120 synchronized(this)
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121 {
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122 if (_acceptChannel != null)
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123 {
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124 removeBean(_acceptChannel);
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125 if (_acceptChannel.isOpen())
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126 _acceptChannel.close();
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127 }
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128 _acceptChannel = null;
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129 _localPort=-2;
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130 }
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131 }
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132
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133 /* ------------------------------------------------------------------------------- */
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134 @Override
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135 public void customize(EndPoint endpoint, Request request) throws IOException
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136 {
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137 request.setTimeStamp(System.currentTimeMillis());
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138 endpoint.setMaxIdleTime(_maxIdleTime);
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139 super.customize(endpoint, request);
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140 }
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141
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142 /* ------------------------------------------------------------------------------- */
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143 @Override
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144 public void persist(EndPoint endpoint) throws IOException
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145 {
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146 AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint);
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147 aEndp.setCheckForIdle(true);
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148 super.persist(endpoint);
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149 }
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150
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151 /* ------------------------------------------------------------ */
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152 public SelectorManager getSelectorManager()
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153 {
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154 return _manager;
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155 }
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156
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157 /* ------------------------------------------------------------ */
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158 public synchronized Object getConnection()
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159 {
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160 return _acceptChannel;
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161 }
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162
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163 /* ------------------------------------------------------------------------------- */
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164 public int getLocalPort()
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165 {
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166 synchronized(this)
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167 {
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168 return _localPort;
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169 }
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170 }
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171
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172 /* ------------------------------------------------------------ */
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173 public void open() throws IOException
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174 {
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175 synchronized(this)
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176 {
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177 if (_acceptChannel == null)
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178 {
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179 // Create a new server socket
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180 _acceptChannel = ServerSocketChannel.open();
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181 // Set to blocking mode
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182 _acceptChannel.configureBlocking(true);
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183
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184 // Bind the server socket to the local host and port
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185 _acceptChannel.socket().setReuseAddress(getReuseAddress());
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186 InetSocketAddress addr = getHost()==null?new InetSocketAddress(getPort()):new InetSocketAddress(getHost(),getPort());
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187 _acceptChannel.socket().bind(addr,getAcceptQueueSize());
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188
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189 _localPort=_acceptChannel.socket().getLocalPort();
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190 if (_localPort<=0)
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191 throw new IOException("Server channel not bound");
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192
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193 addBean(_acceptChannel);
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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 /* ------------------------------------------------------------ */
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199 @Override
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200 public void setMaxIdleTime(int maxIdleTime)
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201 {
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202 _manager.setMaxIdleTime(maxIdleTime);
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203 super.setMaxIdleTime(maxIdleTime);
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204 }
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205
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206 /* ------------------------------------------------------------ */
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207 /**
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208 * @return the lowResourcesConnections
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209 */
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210 public int getLowResourcesConnections()
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211 {
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212 return _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 * Set the number of connections, which if exceeded places this manager in low resources state.
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218 * This is not an exact measure as the connection count is averaged over the select sets.
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219 * @param lowResourcesConnections the number of connections
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220 * @see #setLowResourcesMaxIdleTime(int)
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221 */
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222 public void setLowResourcesConnections(int lowResourcesConnections)
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223 {
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224 _lowResourcesConnections=lowResourcesConnections;
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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 * @return the lowResourcesMaxIdleTime
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230 */
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231 @Override
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232 public int getLowResourcesMaxIdleTime()
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233 {
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234 return _lowResourcesMaxIdleTime;
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235 }
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236
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237 /* ------------------------------------------------------------ */
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238 /**
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239 * Set the period in ms that a connection is allowed to be idle when this there are more
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240 * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections
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241 * in order to gracefully handle high load situations.
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242 * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low.
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243 * @see #setMaxIdleTime(int)
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244 */
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245 @Override
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246 public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime)
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247 {
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248 _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime;
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249 super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime);
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250 }
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251
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252
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253 /* ------------------------------------------------------------ */
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254 /*
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255 * @see org.eclipse.jetty.server.server.AbstractConnector#doStart()
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256 */
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257 @Override
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258 protected void doStart() throws Exception
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259 {
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260 _manager.setSelectSets(getAcceptors());
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261 _manager.setMaxIdleTime(getMaxIdleTime());
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262 _manager.setLowResourcesConnections(getLowResourcesConnections());
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263 _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime());
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264
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265 super.doStart();
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266 }
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267
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268 /* ------------------------------------------------------------ */
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269 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
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270 {
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271 SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime);
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272 endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment()));
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273 return endp;
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274 }
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275
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276 /* ------------------------------------------------------------------------------- */
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277 protected void endPointClosed(SelectChannelEndPoint endpoint)
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278 {
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279 connectionClosed(endpoint.getConnection());
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280 }
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281
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282 /* ------------------------------------------------------------------------------- */
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283 protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint)
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284 {
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285 return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,getServer());
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286 }
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287
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288
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289 /* ------------------------------------------------------------ */
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290 /* ------------------------------------------------------------ */
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291 /* ------------------------------------------------------------ */
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292 private final class ConnectorSelectorManager extends SelectorManager
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293 {
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294 @Override
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295 public boolean dispatch(Runnable task)
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296 {
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297 ThreadPool pool=getThreadPool();
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298 if (pool==null)
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299 pool=getServer().getThreadPool();
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300 return pool.dispatch(task);
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301 }
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302
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303 @Override
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304 protected void endPointClosed(final SelectChannelEndPoint endpoint)
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305 {
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306 SelectChannelConnector.this.endPointClosed(endpoint);
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307 }
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308
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309 @Override
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310 protected void endPointOpened(SelectChannelEndPoint endpoint)
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311 {
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312 // TODO handle max connections and low resources
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313 connectionOpened(endpoint.getConnection());
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314 }
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315
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316 @Override
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317 protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection)
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318 {
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319 connectionUpgraded(oldConnection,endpoint.getConnection());
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320 }
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321
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322 @Override
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323 public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment)
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324 {
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325 return SelectChannelConnector.this.newConnection(channel,endpoint);
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326 }
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327
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328 @Override
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329 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException
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330 {
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331 return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey);
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332 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
333 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
334 }