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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 906:eaf271fb747f
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 07 Oct 2016 03:59:44 -0600 |
parents | 94f5d8a62385 |
children | bc4e299de953 |
rev | line source |
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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 { |
906 | 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 |
906 | 91 public final void accept() throws IOException |
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92 { |
906 | 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 |
897 | 173 _acceptChannel.socket().setReuseAddress(true); |
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174 InetSocketAddress addr = getHost()==null?new InetSocketAddress(port):new InetSocketAddress(getHost(),port); |
906 | 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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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 } |