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annotate src/org/eclipse/jetty/io/nio/SelectChannelEndPoint.java @ 964:768414c16e10
remove SelectSet
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 14 Oct 2016 01:03:47 -0600 |
parents | 4b6216fa9cec |
children | 866f2e801618 |
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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.io.nio; |
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20 |
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21 import java.io.IOException; |
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22 import java.io.InterruptedIOException; |
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23 import java.nio.channels.ClosedChannelException; |
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24 import java.nio.channels.SelectableChannel; |
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25 import java.nio.channels.SelectionKey; |
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26 import java.nio.channels.SocketChannel; |
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27 import java.util.Locale; |
865 | 28 import java.util.concurrent.RejectedExecutionException; |
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29 |
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30 import org.eclipse.jetty.io.AsyncEndPoint; |
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31 import org.eclipse.jetty.io.Buffer; |
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32 import org.eclipse.jetty.io.ConnectedEndPoint; |
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33 import org.eclipse.jetty.io.Connection; |
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34 import org.eclipse.jetty.io.EofException; |
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35 import org.slf4j.Logger; |
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36 import org.slf4j.LoggerFactory; |
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37 |
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38 |
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39 /* ------------------------------------------------------------ */ |
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40 /** |
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41 * An Endpoint that can be scheduled by {@link SelectorManager}. |
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42 */ |
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43 public final class SelectChannelEndPoint extends ChannelEndPoint implements AsyncEndPoint, ConnectedEndPoint |
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44 { |
865 | 45 public static final Logger LOG=LoggerFactory.getLogger("org.eclipse.jetty.io.nio"); |
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46 |
865 | 47 private final SelectorManager _manager; |
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48 private final SelectionKey _key; |
865 | 49 private final Runnable _handler = new Runnable() |
50 { | |
51 public void run() { handle(); } | |
52 }; | |
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53 |
865 | 54 /** |
55 * The connection instance is the handler for any IO activity on the endpoint. | |
56 * There is a different type of connection for HTTP, AJP, WebSocket and | |
57 * ProxyConnect. The connection may change for an SCEP as it is upgraded | |
58 * from HTTP to proxy connect or websocket. | |
59 */ | |
60 private volatile AsyncConnection _connection; | |
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61 /* |
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62 private static final int STATE_NEEDS_DISPATCH = -1; |
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63 private static final int STATE_UNDISPATCHED = 0; |
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64 private static final int STATE_DISPATCHED = 1; |
865 | 65 private int _state; |
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66 */ |
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67 private boolean isDispatched = false; |
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68 |
865 | 69 /** true if the last write operation succeed and wrote all offered bytes */ |
70 private volatile boolean _writable = true; | |
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71 |
865 | 72 /** True if a thread has is blocked in {@link #blockReadable(long)} */ |
73 private boolean _readBlocked; | |
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74 |
865 | 75 /** True if a thread has is blocked in {@link #blockWritable(long)} */ |
76 private boolean _writeBlocked; | |
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77 |
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78 private boolean _ishut = false; |
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79 |
964 | 80 public SelectChannelEndPoint(SocketChannel channel, SelectorManager manager, SelectionKey key, int maxIdleTime) |
865 | 81 throws IOException |
82 { | |
83 super(channel, maxIdleTime); | |
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84 |
964 | 85 _manager = manager; |
865 | 86 _key = key; |
87 } | |
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88 |
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89 @Override |
865 | 90 public Connection getConnection() |
91 { | |
92 return _connection; | |
93 } | |
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94 |
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95 @Override |
865 | 96 public void setConnection(Connection connection) |
97 { | |
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98 _connection = (AsyncConnection)connection; |
865 | 99 } |
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100 |
865 | 101 /* ------------------------------------------------------------ */ |
102 /** Called by selectSet to schedule handling | |
103 * | |
104 */ | |
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105 public synchronized void schedule() |
865 | 106 { |
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107 if (!_key.isValid()) |
865 | 108 { |
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109 /* |
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110 _readBlocked = false; |
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111 _writeBlocked = false; |
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112 this.notifyAll(); |
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113 */ |
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114 _key.cancel(); |
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115 return; |
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116 } |
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117 |
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118 // If there are threads dispatched reading and writing |
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119 if (_readBlocked || _writeBlocked) |
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120 { |
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121 // assert _dispatched; |
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122 if (_readBlocked && _key.isReadable()) |
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123 _readBlocked = false; |
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124 if (_writeBlocked && _key.isWritable()) |
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125 _writeBlocked = false; |
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126 |
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127 // wake them up is as good as a dispatched. |
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128 this.notifyAll(); |
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129 |
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130 // we are not interested in further selecting |
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131 _key.interestOps(0); |
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132 if( !isDispatched ) |
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133 updateKey(); |
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134 return; |
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135 } |
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136 |
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137 // Remove writeable op |
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138 if ((_key.readyOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE && (_key.interestOps() & SelectionKey.OP_WRITE) == SelectionKey.OP_WRITE) |
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139 { |
865 | 140 // Remove writeable op |
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141 int interestOps = _key.interestOps() & ~SelectionKey.OP_WRITE; |
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142 _key.interestOps(interestOps); |
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143 _writable = true; // Once writable is in ops, only removed with dispatch. |
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144 } |
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145 |
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146 // If dispatched, then deregister interest |
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147 if (isDispatched) |
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148 _key.interestOps(0); |
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149 else |
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150 { |
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151 // other wise do the dispatch |
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152 dispatch(); |
865 | 153 } |
154 } | |
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155 |
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156 @Override |
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157 public synchronized void dispatch() |
865 | 158 { |
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159 if( !isDispatched ) |
865 | 160 { |
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161 isDispatched = true; |
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162 try { |
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163 _manager.execute(_handler); |
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164 } catch(RejectedExecutionException e) { |
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165 isDispatched = false; |
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166 LOG.warn("Dispatched Failed! "+this+" to "+_manager); |
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167 // updateKey(); |
865 | 168 } |
169 } | |
170 } | |
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171 |
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172 @Override |
865 | 173 public int fill(Buffer buffer) throws IOException |
174 { | |
175 int fill=super.fill(buffer); | |
176 return fill; | |
177 } | |
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178 |
865 | 179 @Override |
180 public int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException | |
181 { | |
182 int l = super.flush(header, buffer, trailer); | |
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183 |
865 | 184 // If there was something to write and it wasn't written, then we are not writable. |
185 if (l==0 && ( header!=null && header.hasContent() || buffer!=null && buffer.hasContent() || trailer!=null && trailer.hasContent())) | |
186 { | |
187 synchronized (this) | |
188 { | |
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189 _writable = false; |
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190 if( !isDispatched ) |
865 | 191 updateKey(); |
192 } | |
193 } | |
194 else if (l>0) | |
195 { | |
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196 _writable = true; |
865 | 197 } |
198 return l; | |
199 } | |
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200 |
865 | 201 @Override |
202 public int flush(Buffer buffer) throws IOException | |
203 { | |
204 int l = super.flush(buffer); | |
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205 |
865 | 206 // If there was something to write and it wasn't written, then we are not writable. |
207 if (l==0 && buffer!=null && buffer.hasContent()) | |
208 { | |
209 synchronized (this) | |
210 { | |
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211 _writable = false; |
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212 if( !isDispatched ) |
865 | 213 updateKey(); |
214 } | |
215 } | |
216 else if (l>0) | |
217 { | |
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218 _writable = true; |
865 | 219 } |
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220 |
865 | 221 return l; |
222 } | |
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223 |
865 | 224 /* ------------------------------------------------------------ */ |
225 /* | |
226 * Allows thread to block waiting for further events. | |
227 */ | |
228 @Override | |
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229 public synchronized boolean blockReadable(long timeoutMs) throws IOException |
865 | 230 { |
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231 if (isInputShutdown()) |
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232 throw new EofException(); |
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233 |
964 | 234 long now = _manager.getNow(); |
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235 long end = now+timeoutMs; |
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236 try |
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237 { |
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238 _readBlocked = true; |
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239 while (!isInputShutdown() && _readBlocked) |
865 | 240 { |
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241 try |
865 | 242 { |
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243 updateKey(); |
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244 this.wait(timeoutMs>0?(end-now):10000); |
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245 } |
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246 catch (final InterruptedException e) |
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247 { |
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248 LOG.warn("",e); |
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249 } |
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250 finally |
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251 { |
964 | 252 now = _manager.getNow(); |
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253 } |
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254 |
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255 if (_readBlocked && timeoutMs>0 && now>=end) |
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256 return false; |
865 | 257 } |
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258 } |
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259 finally |
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260 { |
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261 _readBlocked = false; |
865 | 262 } |
263 return true; | |
264 } | |
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265 |
865 | 266 /* ------------------------------------------------------------ */ |
267 /* | |
268 * Allows thread to block waiting for further events. | |
269 */ | |
270 @Override | |
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271 public synchronized boolean blockWritable(long timeoutMs) throws IOException |
865 | 272 { |
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273 if (isOutputShutdown()) |
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274 throw new EofException(); |
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275 |
964 | 276 long now=_manager.getNow(); |
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277 long end=now+timeoutMs; |
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278 try |
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279 { |
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280 _writeBlocked = true; |
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281 while (_writeBlocked && !isOutputShutdown()) |
865 | 282 { |
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283 try |
865 | 284 { |
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285 updateKey(); |
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286 this.wait(timeoutMs>0?(end-now):10000); |
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287 } |
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288 catch (final InterruptedException e) |
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289 { |
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290 LOG.warn("",e); |
865 | 291 } |
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292 finally |
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293 { |
964 | 294 now = _manager.getNow(); |
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295 } |
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296 if (_writeBlocked && timeoutMs>0 && now>=end) |
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297 return false; |
865 | 298 } |
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299 } |
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300 finally |
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301 { |
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302 _writeBlocked = false; |
865 | 303 } |
304 return true; | |
305 } | |
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306 |
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307 @Override |
865 | 308 public boolean hasProgressed() |
309 { | |
310 return false; | |
311 } | |
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312 |
865 | 313 /* ------------------------------------------------------------ */ |
314 /** | |
315 * Updates selection key. Adds operations types to the selection key as needed. No operations | |
316 * are removed as this is only done during dispatch. This method records the new key and | |
317 * schedules a call to doUpdateKey to do the keyChange | |
318 */ | |
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319 private synchronized void updateKey() |
865 | 320 { |
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321 if( getChannel().isOpen() && _key.isValid()) |
865 | 322 { |
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323 boolean read_interest = _readBlocked || (!isDispatched && !_connection.isSuspended()); |
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324 boolean write_interest = _writeBlocked || (!isDispatched && !_writable); |
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325 // boolean write_interest = _writeBlocked || !isDispatched; |
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326 // boolean write_interest = true; |
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327 |
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328 int interestOps = |
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329 ((!_socket.isInputShutdown() && read_interest ) ? SelectionKey.OP_READ : 0) |
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330 | ((!_socket.isOutputShutdown()&& write_interest) ? SelectionKey.OP_WRITE : 0); |
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331 if( _key.interestOps() != interestOps ) { |
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332 _key.interestOps(interestOps); |
964 | 333 _manager.getSelector().update(); |
865 | 334 } |
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335 } else { |
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336 _key.cancel(); |
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337 // update needed? |
865 | 338 } |
339 } | |
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340 |
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341 |
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342 private void handle() |
865 | 343 { |
344 try | |
345 { | |
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346 try |
865 | 347 { |
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348 while(true) |
865 | 349 { |
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350 final AsyncConnection next = (AsyncConnection)_connection.handle(); |
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351 if (next==_connection) |
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352 break; |
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353 LOG.debug("{} replaced {}",next,_connection); |
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354 _connection=next; |
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355 } |
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356 } |
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357 catch (ClosedChannelException e) |
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358 { |
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359 LOG.trace("",e); |
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360 } |
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361 catch (EofException e) |
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362 { |
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363 LOG.debug("EOF", e); |
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364 try{close();} |
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365 catch(IOException e2){LOG.trace("",e2);} |
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366 } |
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367 catch (IOException e) |
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368 { |
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369 LOG.warn(e.toString()); |
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370 try{close();} |
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371 catch(IOException e2){LOG.trace("",e2);} |
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372 } |
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373 catch (Throwable e) |
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374 { |
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375 LOG.warn("handle failed", e); |
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376 try{close();} |
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377 catch(IOException e2){LOG.trace("",e2);} |
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378 } |
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379 finally |
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380 { |
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381 if (!_ishut && isInputShutdown() && isOpen()) |
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382 { |
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383 _ishut = true; |
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384 try |
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385 { |
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386 _connection.onInputShutdown(); |
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387 } |
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388 catch(Throwable x) |
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389 { |
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390 LOG.warn("onInputShutdown failed", x); |
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391 try{close();} |
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392 catch(IOException e2){LOG.trace("",e2);} |
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393 } |
865 | 394 } |
395 } | |
396 } | |
397 finally | |
398 { | |
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399 isDispatched = false; |
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400 updateKey(); |
865 | 401 } |
402 } | |
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403 |
865 | 404 /* ------------------------------------------------------------ */ |
405 /* | |
406 * @see org.eclipse.io.nio.ChannelEndPoint#close() | |
407 */ | |
408 @Override | |
409 public void close() throws IOException | |
410 { | |
411 try | |
412 { | |
413 super.close(); | |
414 } | |
415 catch (IOException e) | |
416 { | |
417 LOG.trace("",e); | |
418 } | |
419 finally | |
420 { | |
421 updateKey(); | |
422 } | |
423 } | |
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424 |
865 | 425 @Override |
426 public String toString() | |
427 { | |
428 // Do NOT use synchronized (this) | |
429 // because it's very easy to deadlock when debugging is enabled. | |
430 // We do a best effort to print the right toString() and that's it. | |
431 SelectionKey key = _key; | |
432 String keyString = ""; | |
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433 if (key.isValid()) |
865 | 434 { |
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435 if (key.isReadable()) |
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436 keyString += "r"; |
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437 if (key.isWritable()) |
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438 keyString += "w"; |
865 | 439 } |
440 else | |
441 { | |
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442 keyString += "!"; |
865 | 443 } |
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444 return String.format("SCEP@%x{l(%s)<->r(%s),dispatched=%b,open=%b,ishut=%b,oshut=%b,rb=%b,wb=%b,w=%b,i=%s}-{%s}", |
865 | 445 hashCode(), |
446 _socket.getRemoteSocketAddress(), | |
447 _socket.getLocalSocketAddress(), | |
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448 isDispatched, |
865 | 449 isOpen(), |
450 isInputShutdown(), | |
451 isOutputShutdown(), | |
452 _readBlocked, | |
453 _writeBlocked, | |
454 _writable, | |
455 keyString, | |
456 _connection); | |
457 } | |
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458 |
865 | 459 /* ------------------------------------------------------------ */ |
460 /** | |
461 * Don't set the SoTimeout | |
462 * @see org.eclipse.jetty.io.nio.ChannelEndPoint#setMaxIdleTime(int) | |
463 */ | |
464 @Override | |
465 public void setMaxIdleTime(int timeMs) throws IOException | |
466 { | |
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467 _maxIdleTime = timeMs; |
865 | 468 } |
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469 |
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470 } |