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annotate src/org/eclipse/jetty/server/nio/SelectChannelConnector.java @ 915:65e0fba5861a

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 09 Oct 2016 01:52:29 -0600
parents 54308d65265a
children 0541b6034003
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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.Connector;
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39 import org.eclipse.jetty.server.Request;
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40 import org.eclipse.jetty.server.Server;
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41
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42 /* ------------------------------------------------------------------------------- */
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43 /**
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44 * Selecting NIO connector.
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45 * <p>
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46 * This connector uses efficient NIO buffers with a non blocking threading model. Direct NIO buffers
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47 * are used and threads are only allocated to connections with requests. Synchronization is used to
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48 * simulate blocking for the servlet API, and any unflushed content at the end of request handling
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49 * is written asynchronously.
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50 * </p>
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51 * <p>
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52 * This connector is best used when there are a many connections that have idle periods.
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53 * </p>
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54 * <p>
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55 * When used with {@link org.eclipse.jetty.continuation.Continuation}, threadless waits are supported.
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56 * If a filter or servlet returns after calling {@link Continuation#suspend()} or when a
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57 * runtime exception is thrown from a call to {@link Continuation#undispatch()}, Jetty will
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58 * will not send a response to the client. Instead the thread is released and the Continuation is
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59 * placed on the timer queue. If the Continuation timeout expires, or it's
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60 * resume method is called, then the request is again allocated a thread and the request is retried.
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61 * The limitation of this approach is that request content is not available on the retried request,
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62 * thus if possible it should be read after the continuation or saved as a request attribute or as the
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63 * associated object of the Continuation instance.
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64 * </p>
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65 *
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66 * @org.apache.xbean.XBean element="nioConnector" description="Creates an NIO based socket connector"
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67 */
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68 public class SelectChannelConnector extends Connector
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69 {
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70 private final SelectorManager _manager = new ConnectorSelectorManager();
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71
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72 public SelectChannelConnector(Server server,int port)
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73 {
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74 super(server,port);
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75 _manager.setMaxIdleTime(getMaxIdleTime());
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76 addBean(_manager,true);
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77 setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4));
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78 }
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79
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80 @Override
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81 public final void accept() throws IOException
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82 {
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83 ServerSocketChannel server = _acceptChannel;
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84
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85 if (server!=null && server.isOpen() && _manager.isStarted())
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86 {
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87 SocketChannel channel = server.accept();
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88 channel.configureBlocking(false);
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89 Socket socket = channel.socket();
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90 configure(socket);
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91 _manager.register(channel);
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92 }
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93 }
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94
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95 @Override
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96 public void customize(EndPoint endpoint, Request request) throws IOException
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97 {
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98 request.setTimeStamp(System.currentTimeMillis());
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99 endpoint.setMaxIdleTime(_maxIdleTime);
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100 super.customize(endpoint, request);
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101 }
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102
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103 @Override
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104 public void persist(EndPoint endpoint) throws IOException
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105 {
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106 AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint);
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107 aEndp.setCheckForIdle(true);
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108 super.persist(endpoint);
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109 }
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110
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111 @Override
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112 protected synchronized void doStart() throws Exception
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113 {
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114 _manager.setSelectSets(getAcceptors());
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115 _manager.setMaxIdleTime(getMaxIdleTime());
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116 _manager.setLowResourcesConnections(0);
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117
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118 if (_acceptChannel == null)
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119 {
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120 // Create a new server socket
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121 _acceptChannel = ServerSocketChannel.open();
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122 // Set to blocking mode
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123 _acceptChannel.configureBlocking(true);
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124
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125 // Bind the server socket to the local host and port
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126 _acceptChannel.socket().setReuseAddress(true);
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127 InetSocketAddress addr = getHost()==null?new InetSocketAddress(port):new InetSocketAddress(getHost(),port);
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128 _acceptChannel.bind(addr);
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129 if( _acceptChannel.socket().getLocalPort() != port)
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130 throw new IOException("Server channel not bound");
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131 }
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132
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133 super.doStart();
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134 }
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135
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136 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException
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137 {
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138 SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime);
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139 endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment()));
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140 return endp;
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141 }
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142
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143 protected void endPointClosed(SelectChannelEndPoint endpoint)
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144 {
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145 endpoint.getConnection().onClose();
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146 }
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147
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148 protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint)
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149 {
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150 return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,server);
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151 }
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152
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153
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154 private final class ConnectorSelectorManager extends SelectorManager
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155 {
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156 @Override
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157 public void execute(Runnable task)
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158 {
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159 server.threadPool.execute(task);
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160 }
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162 @Override
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163 protected void endPointClosed(final SelectChannelEndPoint endpoint)
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164 {
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165 SelectChannelConnector.this.endPointClosed(endpoint);
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166 }
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167
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168 @Override
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169 public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment)
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170 {
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171 return SelectChannelConnector.this.newConnection(channel,endpoint);
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172 }
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173
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174 @Override
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175 protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException
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176 {
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177 return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey);
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178 }
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179 }
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180 }