Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | package org.eclipse.jetty.server.nio; |
| 20 | |
| 21 | import java.io.IOException; |
| 22 | import java.net.InetSocketAddress; |
| 23 | import java.net.Socket; |
| 24 | import java.nio.channels.SelectionKey; |
| 25 | import java.nio.channels.ServerSocketChannel; |
| 26 | import java.nio.channels.SocketChannel; |
| 27 | |
| 28 | import org.eclipse.jetty.continuation.Continuation; |
| 29 | import org.eclipse.jetty.io.AsyncEndPoint; |
| 30 | import org.eclipse.jetty.io.ConnectedEndPoint; |
| 31 | import org.eclipse.jetty.io.Connection; |
| 32 | import org.eclipse.jetty.io.EndPoint; |
| 33 | import org.eclipse.jetty.io.nio.AsyncConnection; |
| 34 | import org.eclipse.jetty.io.nio.SelectChannelEndPoint; |
| 35 | import org.eclipse.jetty.io.nio.SelectorManager; |
| 36 | import org.eclipse.jetty.io.nio.SelectorManager.SelectSet; |
| 37 | import org.eclipse.jetty.server.AsyncHttpConnection; |
| 38 | import org.eclipse.jetty.server.Request; |
| 39 | import org.eclipse.jetty.util.thread.ThreadPool; |
| 40 | |
| 41 | /* ------------------------------------------------------------------------------- */ |
| 42 | /** |
| 43 | * Selecting NIO connector. |
| 44 | * <p> |
| 45 | * This connector uses efficient NIO buffers with a non blocking threading model. Direct NIO buffers |
| 46 | * are used and threads are only allocated to connections with requests. Synchronization is used to |
| 47 | * simulate blocking for the servlet API, and any unflushed content at the end of request handling |
| 48 | * is written asynchronously. |
| 49 | * </p> |
| 50 | * <p> |
| 51 | * This connector is best used when there are a many connections that have idle periods. |
| 52 | * </p> |
| 53 | * <p> |
| 54 | * When used with {@link org.eclipse.jetty.continuation.Continuation}, threadless waits are supported. |
| 55 | * If a filter or servlet returns after calling {@link Continuation#suspend()} or when a |
| 56 | * runtime exception is thrown from a call to {@link Continuation#undispatch()}, Jetty will |
| 57 | * will not send a response to the client. Instead the thread is released and the Continuation is |
| 58 | * placed on the timer queue. If the Continuation timeout expires, or it's |
| 59 | * resume method is called, then the request is again allocated a thread and the request is retried. |
| 60 | * The limitation of this approach is that request content is not available on the retried request, |
| 61 | * thus if possible it should be read after the continuation or saved as a request attribute or as the |
| 62 | * associated object of the Continuation instance. |
| 63 | * </p> |
| 64 | * |
| 65 | * @org.apache.xbean.XBean element="nioConnector" description="Creates an NIO based socket connector" |
| 66 | */ |
| 67 | public class SelectChannelConnector extends AbstractNIOConnector |
| 68 | { |
| 69 | protected ServerSocketChannel _acceptChannel; |
| 70 | private int _lowResourcesConnections; |
| 71 | private int _lowResourcesMaxIdleTime; |
| 72 | private int _localPort=-1; |
| 73 | |
| 74 | private final SelectorManager _manager = new ConnectorSelectorManager(); |
| 75 | |
| 76 | /* ------------------------------------------------------------------------------- */ |
| 77 | /** |
| 78 | * Constructor. |
| 79 | * |
| 80 | */ |
| 81 | public SelectChannelConnector() |
| 82 | { |
| 83 | _manager.setMaxIdleTime(getMaxIdleTime()); |
| 84 | addBean(_manager,true); |
| 85 | setAcceptors(Math.max(1,(Runtime.getRuntime().availableProcessors()+3)/4)); |
| 86 | } |
| 87 | |
| 88 | @Override |
| 89 | public void setThreadPool(ThreadPool pool) |
| 90 | { |
| 91 | super.setThreadPool(pool); |
| 92 | // preserve start order |
| 93 | removeBean(_manager); |
| 94 | addBean(_manager,true); |
| 95 | } |
| 96 | |
| 97 | /* ------------------------------------------------------------ */ |
| 98 | @Override |
| 99 | public void accept(int acceptorID) throws IOException |
| 100 | { |
| 101 | ServerSocketChannel server; |
| 102 | synchronized(this) |
| 103 | { |
| 104 | server = _acceptChannel; |
| 105 | } |
| 106 | |
| 107 | if (server!=null && server.isOpen() && _manager.isStarted()) |
| 108 | { |
| 109 | SocketChannel channel = server.accept(); |
| 110 | channel.configureBlocking(false); |
| 111 | Socket socket = channel.socket(); |
| 112 | configure(socket); |
| 113 | _manager.register(channel); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | /* ------------------------------------------------------------ */ |
| 118 | public void close() throws IOException |
| 119 | { |
| 120 | synchronized(this) |
| 121 | { |
| 122 | if (_acceptChannel != null) |
| 123 | { |
| 124 | removeBean(_acceptChannel); |
| 125 | if (_acceptChannel.isOpen()) |
| 126 | _acceptChannel.close(); |
| 127 | } |
| 128 | _acceptChannel = null; |
| 129 | _localPort=-2; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | /* ------------------------------------------------------------------------------- */ |
| 134 | @Override |
| 135 | public void customize(EndPoint endpoint, Request request) throws IOException |
| 136 | { |
| 137 | request.setTimeStamp(System.currentTimeMillis()); |
| 138 | endpoint.setMaxIdleTime(_maxIdleTime); |
| 139 | super.customize(endpoint, request); |
| 140 | } |
| 141 | |
| 142 | /* ------------------------------------------------------------------------------- */ |
| 143 | @Override |
| 144 | public void persist(EndPoint endpoint) throws IOException |
| 145 | { |
| 146 | AsyncEndPoint aEndp = ((AsyncEndPoint)endpoint); |
| 147 | aEndp.setCheckForIdle(true); |
| 148 | super.persist(endpoint); |
| 149 | } |
| 150 | |
| 151 | /* ------------------------------------------------------------ */ |
| 152 | public SelectorManager getSelectorManager() |
| 153 | { |
| 154 | return _manager; |
| 155 | } |
| 156 | |
| 157 | /* ------------------------------------------------------------ */ |
| 158 | public synchronized Object getConnection() |
| 159 | { |
| 160 | return _acceptChannel; |
| 161 | } |
| 162 | |
| 163 | /* ------------------------------------------------------------------------------- */ |
| 164 | public int getLocalPort() |
| 165 | { |
| 166 | synchronized(this) |
| 167 | { |
| 168 | return _localPort; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | /* ------------------------------------------------------------ */ |
| 173 | public void open() throws IOException |
| 174 | { |
| 175 | synchronized(this) |
| 176 | { |
| 177 | if (_acceptChannel == null) |
| 178 | { |
| 179 | // Create a new server socket |
| 180 | _acceptChannel = ServerSocketChannel.open(); |
| 181 | // Set to blocking mode |
| 182 | _acceptChannel.configureBlocking(true); |
| 183 | |
| 184 | // Bind the server socket to the local host and port |
| 185 | _acceptChannel.socket().setReuseAddress(getReuseAddress()); |
| 186 | InetSocketAddress addr = getHost()==null?new InetSocketAddress(getPort()):new InetSocketAddress(getHost(),getPort()); |
| 187 | _acceptChannel.socket().bind(addr,getAcceptQueueSize()); |
| 188 | |
| 189 | _localPort=_acceptChannel.socket().getLocalPort(); |
| 190 | if (_localPort<=0) |
| 191 | throw new IOException("Server channel not bound"); |
| 192 | |
| 193 | addBean(_acceptChannel); |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /* ------------------------------------------------------------ */ |
| 199 | @Override |
| 200 | public void setMaxIdleTime(int maxIdleTime) |
| 201 | { |
| 202 | _manager.setMaxIdleTime(maxIdleTime); |
| 203 | super.setMaxIdleTime(maxIdleTime); |
| 204 | } |
| 205 | |
| 206 | /* ------------------------------------------------------------ */ |
| 207 | /** |
| 208 | * @return the lowResourcesConnections |
| 209 | */ |
| 210 | public int getLowResourcesConnections() |
| 211 | { |
| 212 | return _lowResourcesConnections; |
| 213 | } |
| 214 | |
| 215 | /* ------------------------------------------------------------ */ |
| 216 | /** |
| 217 | * Set the number of connections, which if exceeded places this manager in low resources state. |
| 218 | * This is not an exact measure as the connection count is averaged over the select sets. |
| 219 | * @param lowResourcesConnections the number of connections |
| 220 | * @see #setLowResourcesMaxIdleTime(int) |
| 221 | */ |
| 222 | public void setLowResourcesConnections(int lowResourcesConnections) |
| 223 | { |
| 224 | _lowResourcesConnections=lowResourcesConnections; |
| 225 | } |
| 226 | |
| 227 | /* ------------------------------------------------------------ */ |
| 228 | /** |
| 229 | * @return the lowResourcesMaxIdleTime |
| 230 | */ |
| 231 | @Override |
| 232 | public int getLowResourcesMaxIdleTime() |
| 233 | { |
| 234 | return _lowResourcesMaxIdleTime; |
| 235 | } |
| 236 | |
| 237 | /* ------------------------------------------------------------ */ |
| 238 | /** |
| 239 | * Set the period in ms that a connection is allowed to be idle when this there are more |
| 240 | * than {@link #getLowResourcesConnections()} connections. This allows the server to rapidly close idle connections |
| 241 | * in order to gracefully handle high load situations. |
| 242 | * @param lowResourcesMaxIdleTime the period in ms that a connection is allowed to be idle when resources are low. |
| 243 | * @see #setMaxIdleTime(int) |
| 244 | */ |
| 245 | @Override |
| 246 | public void setLowResourcesMaxIdleTime(int lowResourcesMaxIdleTime) |
| 247 | { |
| 248 | _lowResourcesMaxIdleTime=lowResourcesMaxIdleTime; |
| 249 | super.setLowResourcesMaxIdleTime(lowResourcesMaxIdleTime); |
| 250 | } |
| 251 | |
| 252 | |
| 253 | /* ------------------------------------------------------------ */ |
| 254 | /* |
| 255 | * @see org.eclipse.jetty.server.server.AbstractConnector#doStart() |
| 256 | */ |
| 257 | @Override |
| 258 | protected void doStart() throws Exception |
| 259 | { |
| 260 | _manager.setSelectSets(getAcceptors()); |
| 261 | _manager.setMaxIdleTime(getMaxIdleTime()); |
| 262 | _manager.setLowResourcesConnections(getLowResourcesConnections()); |
| 263 | _manager.setLowResourcesMaxIdleTime(getLowResourcesMaxIdleTime()); |
| 264 | |
| 265 | super.doStart(); |
| 266 | } |
| 267 | |
| 268 | /* ------------------------------------------------------------ */ |
| 269 | protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey key) throws IOException |
| 270 | { |
| 271 | SelectChannelEndPoint endp= new SelectChannelEndPoint(channel,selectSet,key, SelectChannelConnector.this._maxIdleTime); |
| 272 | endp.setConnection(selectSet.getManager().newConnection(channel,endp, key.attachment())); |
| 273 | return endp; |
| 274 | } |
| 275 | |
| 276 | /* ------------------------------------------------------------------------------- */ |
| 277 | protected void endPointClosed(SelectChannelEndPoint endpoint) |
| 278 | { |
| 279 | connectionClosed(endpoint.getConnection()); |
| 280 | } |
| 281 | |
| 282 | /* ------------------------------------------------------------------------------- */ |
| 283 | protected AsyncConnection newConnection(SocketChannel channel,final AsyncEndPoint endpoint) |
| 284 | { |
| 285 | return new AsyncHttpConnection(SelectChannelConnector.this,endpoint,getServer()); |
| 286 | } |
| 287 | |
| 288 | |
| 289 | /* ------------------------------------------------------------ */ |
| 290 | /* ------------------------------------------------------------ */ |
| 291 | /* ------------------------------------------------------------ */ |
| 292 | private final class ConnectorSelectorManager extends SelectorManager |
| 293 | { |
| 294 | @Override |
| 295 | public boolean dispatch(Runnable task) |
| 296 | { |
| 297 | ThreadPool pool=getThreadPool(); |
| 298 | if (pool==null) |
| 299 | pool=getServer().getThreadPool(); |
| 300 | return pool.dispatch(task); |
| 301 | } |
| 302 | |
| 303 | @Override |
| 304 | protected void endPointClosed(final SelectChannelEndPoint endpoint) |
| 305 | { |
| 306 | SelectChannelConnector.this.endPointClosed(endpoint); |
| 307 | } |
| 308 | |
| 309 | @Override |
| 310 | protected void endPointOpened(SelectChannelEndPoint endpoint) |
| 311 | { |
| 312 | // TODO handle max connections and low resources |
| 313 | connectionOpened(endpoint.getConnection()); |
| 314 | } |
| 315 | |
| 316 | @Override |
| 317 | protected void endPointUpgraded(ConnectedEndPoint endpoint, Connection oldConnection) |
| 318 | { |
| 319 | connectionUpgraded(oldConnection,endpoint.getConnection()); |
| 320 | } |
| 321 | |
| 322 | @Override |
| 323 | public AsyncConnection newConnection(SocketChannel channel,AsyncEndPoint endpoint, Object attachment) |
| 324 | { |
| 325 | return SelectChannelConnector.this.newConnection(channel,endpoint); |
| 326 | } |
| 327 | |
| 328 | @Override |
| 329 | protected SelectChannelEndPoint newEndPoint(SocketChannel channel, SelectSet selectSet, SelectionKey sKey) throws IOException |
| 330 | { |
| 331 | return SelectChannelConnector.this.newEndPoint(channel,selectSet,sKey); |
| 332 | } |
| 333 | } |
| 334 | } |