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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 864:e21ca9878a10
simplify ThreadPool use
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 02 Oct 2016 16:17:38 -0600 |
parents | 3428c60d7cfc |
children | 6b210bb66c63 |
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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 /* ------------------------------------------------------------ */ |
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89 @Override |
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90 public void accept(int acceptorID) throws IOException |
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91 { |
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92 ServerSocketChannel server; |
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93 synchronized(this) |
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94 { |
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95 server = _acceptChannel; |
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96 } |
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97 |
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98 if (server!=null && server.isOpen() && _manager.isStarted()) |
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99 { |
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100 SocketChannel channel = server.accept(); |
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101 channel.configureBlocking(false); |
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102 Socket socket = channel.socket(); |
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103 configure(socket); |
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104 _manager.register(channel); |
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105 } |
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106 } |
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107 |
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108 /* ------------------------------------------------------------ */ |
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109 public void close() throws IOException |
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110 { |
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111 synchronized(this) |
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112 { |
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113 if (_acceptChannel != null) |
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114 { |
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115 removeBean(_acceptChannel); |
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116 if (_acceptChannel.isOpen()) |
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117 _acceptChannel.close(); |
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118 } |
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119 _acceptChannel = null; |
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120 _localPort=-2; |
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121 } |
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122 } |
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123 |
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124 /* ------------------------------------------------------------------------------- */ |
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125 @Override |
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126 public void customize(EndPoint endpoint, Request request) throws IOException |
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127 { |
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128 request.setTimeStamp(System.currentTimeMillis()); |
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129 endpoint.setMaxIdleTime(_maxIdleTime); |
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130 super.customize(endpoint, request); |
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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 persist(EndPoint endpoint) throws IOException |
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136 { |
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137 AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint); |
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138 aEndp.setCheckForIdle(true); |
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139 super.persist(endpoint); |
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140 } |
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141 |
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142 /* ------------------------------------------------------------ */ |
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143 public SelectorManager getSelectorManager() |
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144 { |
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145 return _manager; |
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146 } |
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147 |
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148 /* ------------------------------------------------------------ */ |
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149 public synchronized Object getConnection() |
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150 { |
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151 return _acceptChannel; |
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152 } |
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153 |
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154 /* ------------------------------------------------------------------------------- */ |
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155 public int getLocalPort() |
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156 { |
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157 synchronized(this) |
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158 { |
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159 return _localPort; |
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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 public void open() throws IOException |
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165 { |
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166 synchronized(this) |
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167 { |
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168 if (_acceptChannel == null) |
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169 { |
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170 // Create a new server socket |
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171 _acceptChannel = ServerSocketChannel.open(); |
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172 // Set to blocking mode |
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173 _acceptChannel.configureBlocking(true); |
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174 |
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175 // Bind the server socket to the local host and port |
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176 _acceptChannel.socket().setReuseAddress(getReuseAddress()); |
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177 InetSocketAddress addr = getHost()==null?new InetSocketAddress(getPort()):new InetSocketAddress(getHost(),getPort()); |
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178 _acceptChannel.socket().bind(addr,getAcceptQueueSize()); |
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179 |
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180 _localPort=_acceptChannel.socket().getLocalPort(); |
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181 if (_localPort<=0) |
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182 throw new IOException("Server channel not bound"); |
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183 |
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184 addBean(_acceptChannel); |
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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 /* ------------------------------------------------------------ */ |
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190 @Override |
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191 public void setMaxIdleTime(int maxIdleTime) |
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192 { |
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193 _manager.setMaxIdleTime(maxIdleTime); |
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194 super.setMaxIdleTime(maxIdleTime); |
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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 * @return the lowResourcesConnections |
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200 */ |
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201 public int getLowResourcesConnections() |
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202 { |
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203 return _lowResourcesConnections; |
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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 * Set the number of connections, which if exceeded places this manager in low resources state. |
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209 * This is not an exact measure as the connection count is averaged over the select sets. |
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210 * @param lowResourcesConnections the number of connections |
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211 * @see #setLowResourcesMaxIdleTime(int) |
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212 */ |
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213 public void setLowResourcesConnections(int lowResourcesConnections) |
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214 { |
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215 _lowResourcesConnections=lowResourcesConnections; |
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216 } |
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217 |
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218 /* ------------------------------------------------------------ */ |
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219 /** |
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220 * @return the lowResourcesMaxIdleTime |
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221 */ |
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222 @Override |
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223 public int getLowResourcesMaxIdleTime() |
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224 { |
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225 return _lowResourcesMaxIdleTime; |
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226 } |
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227 |
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228 /* ------------------------------------------------------------ */ |
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229 /** |
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230 * Set the period in ms that a connection is allowed to be idle when this there are more |
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231 * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections |
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232 * in order to gracefully handle high load situations. |
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233 * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low. |
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234 * @see #setMaxIdleTime(int) |
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235 */ |
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236 @Override |
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237 public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime) |
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238 { |
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239 _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime; |
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240 super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime); |
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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 /* |
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246 * @see org.eclipse.jetty.server.server.AbstractConnector#doStart() |
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247 */ |
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248 @Override |
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249 protected void doStart() throws Exception |
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250 { |
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251 _manager.setSelectSets(getAcceptors()); |
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252 _manager.setMaxIdleTime(getMaxIdleTime()); |
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253 _manager.setLowResourcesConnections(getLowResourcesConnections()); |
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254 _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime()); |
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255 |
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256 super.doStart(); |
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257 } |
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258 |
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259 /* ------------------------------------------------------------ */ |
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260 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException |
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261 { |
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262 SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime); |
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263 endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment())); |
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264 return endp; |
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265 } |
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266 |
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267 /* ------------------------------------------------------------------------------- */ |
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268 protected void endPointClosed(SelectChannelEndPoint endpoint) |
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269 { |
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270 connectionClosed(endpoint.getConnection()); |
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271 } |
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272 |
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273 /* ------------------------------------------------------------------------------- */ |
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274 protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint) |
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275 { |
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276 return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,getServer()); |
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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 /* ------------------------------------------------------------ */ |
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283 private final class ConnectorSelectorManager extends SelectorManager |
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284 { |
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285 @Override |
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286 public boolean dispatch(Runnable task) |
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287 { |
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288 ThreadPool pool=getThreadPool(); |
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289 if (pool==null) |
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290 pool=getServer().getThreadPool(); |
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291 return pool.dispatch(task); |
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292 } |
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293 |
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294 @Override |
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295 protected void endPointClosed(final SelectChannelEndPoint endpoint) |
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296 { |
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297 SelectChannelConnector.this.endPointClosed(endpoint); |
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298 } |
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299 |
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300 @Override |
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301 protected void endPointOpened(SelectChannelEndPoint endpoint) |
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302 { |
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303 // TODO handle max connections and low resources |
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304 connectionOpened(endpoint.getConnection()); |
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305 } |
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306 |
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307 @Override |
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308 protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection) |
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309 { |
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310 connectionUpgraded(oldConnection,endpoint.getConnection()); |
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311 } |
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312 |
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313 @Override |
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314 public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment) |
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315 { |
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316 return SelectChannelConnector.this.newConnection(channel,endpoint); |
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317 } |
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318 |
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319 @Override |
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320 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException |
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321 { |
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322 return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey); |
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323 } |
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324 } |
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325 } |