Mercurial > hg > RemoteEditor > REPSessionManager
annotate rep/ServerMainLoop.java @ 485:cc262a519b8a
add dead lock detection (don't forget remove )
| author | one |
|---|---|
| date | Wed, 20 Oct 2010 22:59:19 +0900 |
| parents | d295e84c5e03 |
| children | 5945266c970d |
| rev | line source |
|---|---|
| 390 | 1 package rep; |
| 2 | |
| 3 import java.io.IOException; | |
| 4 import java.net.InetSocketAddress; | |
| 5 import java.net.SocketException; | |
| 6 import java.nio.channels.ClosedChannelException; | |
| 7 import java.nio.channels.SelectionKey; | |
| 8 import java.util.LinkedList; | |
| 9 import java.util.Set; | |
| 10 import java.util.concurrent.BlockingQueue; | |
| 11 import java.util.concurrent.LinkedBlockingQueue; | |
| 12 | |
| 13 import rep.channel.REPLogger; | |
| 14 import rep.channel.REPSelectionKey; | |
| 15 import rep.channel.REPSelector; | |
| 16 import rep.channel.REPServerSocketChannel; | |
| 17 import rep.channel.REPSocketChannel; | |
| 18 import rep.gui.SessionManagerEvent; | |
| 19 import rep.gui.SessionManagerGUI; | |
| 20 import rep.handler.FirstConnector; | |
| 21 import rep.handler.REPNode; | |
| 22 | |
| 411 | 23 /** |
| 24 * @author kono | |
| 25 * Single Threaded Server Main Loop | |
| 26 * maintain multiple connections | |
| 27 * gui interface is provided. | |
| 28 * Protocols are handled by our manager. | |
| 412 | 29 * We believe this is an protocol independent server. |
| 411 | 30 */ |
| 390 | 31 public class ServerMainLoop { |
| 32 | |
| 33 public static REPLogger logger = REPLogger.singleton(); | |
| 34 public SessionManager manager; | |
| 35 protected SessionManagerGUI gui; | |
| 36 protected REPSelector<REPCommand> selector; | |
| 37 private BlockingQueue<SessionManagerEvent> waitingEventQueue | |
| 38 = new LinkedBlockingQueue<SessionManagerEvent>(); | |
| 39 public String myHost; | |
| 40 private LinkedList<PacketSet> writeQueue = new LinkedList<PacketSet>(); | |
| 41 protected int receive_port; | |
| 42 protected int parent_port; | |
| 43 protected static final int DEFAULT_PORT = 8766; | |
| 44 private SessionManagerEvent execAfterConnect = null; | |
| 430 | 45 private boolean running = true; |
| 390 | 46 |
| 47 | |
| 48 public void setReceivePort(int port) { | |
| 49 receive_port = port; | |
| 50 } | |
| 51 | |
| 52 void mainLoop(SessionManager sessionManager, int port, SessionManagerGUI gui) throws IOException, | |
| 53 SocketException, ClosedChannelException { | |
| 54 this.gui = gui; | |
| 55 manager = sessionManager; | |
| 56 receive_port = port; | |
| 57 serverInit(); | |
| 58 mainLoop(); | |
| 59 } | |
| 60 | |
| 61 public void mainLoop() throws IOException { | |
| 485 | 62 int deadlock = 0; |
| 430 | 63 while(running){ |
| 399 | 64 manager.checkWaitingCommandInMerge(); |
| 390 | 65 if (checkInputEvent() || |
| 66 checkWaitingWrite()) { | |
| 420 | 67 continue; |
| 390 | 68 // try to do fair execution for waiting task |
| 420 | 69 //if(selector.selectNow() > 0) select(); |
| 70 //continue; | |
| 390 | 71 } |
| 72 // now we can wait for input packet or event | |
| 485 | 73 if (deadlock++>1000) deadlockDetected(); |
| 462 | 74 selector.select(1); |
| 485 | 75 if (select()) deadlock=0; |
| 390 | 76 } |
| 77 } | |
| 78 | |
| 485 | 79 public void deadlockDetected() throws IOException { |
| 80 } | |
| 81 | |
| 390 | 82 void serverInit() throws IOException, SocketException, |
| 83 ClosedChannelException { | |
| 84 selector = REPSelector.<REPCommand>create(); | |
| 85 REPServerSocketChannel<REPCommand> ssc = REPServerSocketChannel.<REPCommand>open(new REPCommandPacker()); | |
| 86 ssc.configureBlocking(false); // Selector requires this | |
| 87 ssc.socket().setReuseAddress(true); //reuse address 必須 | |
| 88 //getAllByNameで取れた全てのアドレスに対してbindする | |
| 89 try { | |
| 90 ssc.socket().bind(new InetSocketAddress("::",receive_port)); | |
| 91 } catch (SocketException e) { | |
| 391 | 92 // for some IPv6 implementation |
| 390 | 93 ssc.socket().bind(new InetSocketAddress(receive_port)); |
| 94 } | |
| 95 ssc.register(selector, SelectionKey.OP_ACCEPT,null); | |
| 96 } | |
| 97 | |
| 98 private boolean checkInputEvent() { | |
| 99 SessionManagerEvent e; | |
| 100 if((e = waitingEventQueue.poll())!=null){ | |
| 101 e.exec(manager); | |
| 102 return true; | |
| 103 } | |
| 104 return false; | |
| 105 } | |
| 430 | 106 |
| 107 public void serverStop() { | |
| 108 running = false; | |
| 109 selector.wakeup(); | |
| 110 } | |
| 390 | 111 |
| 411 | 112 /** |
| 113 * To avoid dead locks, we write a command one at a time | |
| 114 * during select(). | |
| 115 * @return | |
| 116 * @throws IOException | |
| 117 */ | |
| 390 | 118 private boolean checkWaitingWrite() throws IOException { |
| 119 PacketSet p = writeQueue.poll(); | |
| 120 if (p!=null) { | |
|
458
c22f6833d736
synchronize Editor's waiting queue and Manager's writing queue
one
parents:
450
diff
changeset
|
121 sendLog(p); |
| 390 | 122 p.channel.write(p.command); |
| 123 return true; | |
| 124 } | |
| 125 return false; | |
| 126 } | |
|
458
c22f6833d736
synchronize Editor's waiting queue and Manager's writing queue
one
parents:
450
diff
changeset
|
127 /** |
| 411 | 128 * Debug message |
| 129 * @param p | |
| 130 */ | |
| 401 | 131 private void sendLog(PacketSet p) { |
| 132 REPNode to; | |
| 133 String s; | |
|
458
c22f6833d736
synchronize Editor's waiting queue and Manager's writing queue
one
parents:
450
diff
changeset
|
134 to = p.channel; // manager.editorList.editorByChannel(p.channel.channel); |
| 401 | 135 if (to==null) |
| 136 s = p.channel.toString(); | |
| 137 else | |
| 138 s = to.toString(); | |
| 139 logger.writeLog("writing: "+p.command+" to: " + s); | |
| 140 } | |
| 141 | |
| 390 | 142 |
| 399 | 143 public void close(REPSocketChannel<REPCommand> channel) { |
| 390 | 144 REPSelectionKey<REPCommand>key = channel.keyFor1(selector); |
| 145 REPNode handler = (REPNode)key.attachment(); | |
| 146 key.cancel(); | |
| 147 handler.cancel(channel); | |
| 148 // we have to remove session/editor | |
| 149 } | |
| 150 | |
| 411 | 151 /** |
| 152 * Main Select routing | |
| 153 * check incoming connection request and incoming packet | |
| 154 * A request is handled by a handler object which is attached | |
| 155 * to the SelectionKey. | |
| 485 | 156 * @return |
| 411 | 157 * @throws IOException |
| 158 */ | |
| 485 | 159 private boolean select() throws IOException { |
| 160 boolean flag = false; | |
| 390 | 161 Set<REPSelectionKey<REPCommand>> keys = selector.selectedKeys1(); |
| 162 for(REPSelectionKey<REPCommand> key : keys){ | |
| 163 if(key.isAcceptable()){ | |
| 164 /* | |
| 165 * Incoming connection. We don't know which, editor or | |
| 166 * session manager. Assign FirstConnector to distinguish. | |
| 167 */ | |
| 168 REPSocketChannel<REPCommand> channel = key.accept(new REPCommandPacker()); | |
| 169 logger.writeLog("SessionManager.select() : key.isAcceptable : channel = " + channel); | |
| 170 registerChannel(channel, new FirstConnector(manager,channel)); | |
| 485 | 171 flag = true; |
| 390 | 172 } else if(key.isReadable()){ |
| 173 /* | |
| 174 * Incoming packets are handled by a various forwarder. | |
| 175 * A handler throw IOException() in case of a trouble to | |
| 176 * close the channel. | |
| 177 */ | |
| 178 REPNode handler = (REPNode)key.attachment(); | |
| 179 try { | |
| 180 REPCommand command = key.channel1().read(); | |
| 181 handler.handle(command, key); | |
| 485 | 182 flag = true; |
| 390 | 183 } catch (IOException e) { |
| 184 key.cancel(); | |
| 185 handler.cancel(key.channel1()); | |
| 186 } | |
| 187 } | |
| 188 } | |
| 485 | 189 return flag; |
| 390 | 190 } |
| 191 | |
| 192 public void registerChannel(REPSocketChannel<REPCommand> channel, REPNode handler) throws IOException { | |
| 193 if(channel == null) { | |
| 194 return; | |
| 195 } | |
| 196 // handler.setChannel(channel); | |
| 197 channel.configureBlocking(false); | |
| 198 channel.register(selector, SelectionKey.OP_READ, handler); | |
| 199 } | |
| 200 | |
| 201 public void setMyHostName(String localHostName) { | |
| 202 myHost = localHostName + receive_port; | |
| 203 setHostToEditor(myHost); | |
| 204 } | |
| 205 | |
| 206 public String myHost() { | |
| 207 return myHost; | |
| 208 } | |
| 209 | |
| 210 private void setHostToEditor(String myHost2) { | |
| 211 for(REPNode editor : manager.editorList.values()){ | |
| 212 if (editor.channel!=null) | |
| 213 editor.setHost(myHost2); | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 | |
| 218 public void buttonPressed(SessionManagerEvent event) { | |
| 219 try { | |
| 220 waitingEventQueue.put(event); | |
| 221 } catch (InterruptedException e) {} | |
| 222 selector.wakeup(); | |
| 223 } | |
| 224 | |
| 225 public void syncExec(SessionManagerEvent event) { | |
| 226 try { | |
| 227 waitingEventQueue.put(event); | |
| 228 } catch (InterruptedException e) { | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 public void addWriteQueue(PacketSet packetSet) { | |
| 233 writeQueue.addLast(packetSet); | |
| 234 assert(writeQueue.size()<SessionManager.packetLimit) ; | |
| 235 } | |
| 236 | |
| 237 public void setParentPort(int port) { | |
| 238 parent_port = port; | |
| 239 } | |
| 240 | |
| 241 public int getParentPort() { | |
| 242 return parent_port; | |
| 243 } | |
| 244 | |
| 245 public int getPort() { | |
| 246 return receive_port; | |
| 247 } | |
| 248 | |
| 249 public void execAfterConnect(SessionManagerEvent sessionManagerEvent) { | |
| 250 execAfterConnect = sessionManagerEvent; | |
| 251 } | |
| 252 | |
| 253 public void afterConnect() { | |
| 254 SessionManagerEvent e = execAfterConnect; | |
| 255 execAfterConnect = null; | |
| 256 if (e!=null) e.exec(manager); | |
| 257 } | |
| 258 | |
| 259 void removeChannel(SessionManager sessionManager, REPNode channel) { | |
| 260 REPSelectionKey<REPCommand> key = channel.channel.keyFor1(selector); | |
| 261 key.cancel(); | |
| 262 try { | |
| 263 channel.channel.close1(); | |
| 264 } catch (IOException e) { | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 public String toString() { | |
| 269 return ""+myHost+":"+receive_port; | |
| 270 } | |
| 271 | |
| 272 | |
| 273 public void setGUI(SessionManagerGUI gui) { | |
| 274 this.gui = gui; | |
| 275 } | |
| 276 | |
| 277 public void setManager(SessionManager sessionManager) { | |
| 278 manager = sessionManager; | |
| 279 } | |
| 280 | |
| 281 } |