openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/connection/ConnectionAdapterImpl.java

   1 /*
   2  * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9
  10 package org.opendaylight.openflowjava.protocol.impl.core.connection;
  11
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.cache.Cache;
  14 import com.google.common.cache.CacheBuilder;
  15 import com.google.common.cache.RemovalCause;
  16 import com.google.common.cache.RemovalListener;
  17 import com.google.common.cache.RemovalNotification;
  18 import com.google.common.util.concurrent.ListenableFuture;
  19 import com.google.common.util.concurrent.SettableFuture;
  20 import io.netty.channel.Channel;
  21 import io.netty.channel.ChannelFuture;
  22 import io.netty.util.concurrent.GenericFutureListener;
  23 import java.net.InetSocketAddress;
  24 import java.util.concurrent.Future;
  25 import java.util.concurrent.RejectedExecutionException;
  26 import java.util.concurrent.TimeUnit;
  27 import org.opendaylight.openflowjava.protocol.api.connection.ConnectionReadyListener;
  28 import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueueHandler;
  29 import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueueHandlerRegistration;
  30 import org.opendaylight.openflowjava.protocol.impl.core.OFVersionDetector;
  31 import org.opendaylight.openflowjava.protocol.impl.core.PipelineHandlers;
  32 import org.opendaylight.openflowjava.statistics.CounterEventTypes;
  33 import org.opendaylight.openflowjava.statistics.StatisticsCounters;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierInput;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierOutput;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.EchoInput;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.EchoOutput;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.EchoReplyInput;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.EchoRequestMessage;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.ErrorMessage;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.ExperimenterInput;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.ExperimenterMessage;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FlowModInput;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FlowRemovedMessage;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetAsyncInput;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetAsyncOutput;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetConfigInput;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetConfigOutput;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetFeaturesInput;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetFeaturesOutput;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetQueueConfigInput;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetQueueConfigOutput;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GroupModInput;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloInput;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloMessage;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.MeterModInput;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.MultipartReplyMessage;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.MultipartRequestInput;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OpenflowProtocolListener;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PacketInMessage;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PacketOutInput;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PortModInput;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PortStatusMessage;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.RoleRequestInput;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.RoleRequestOutput;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.SetAsyncInput;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.SetConfigInput;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.TableModInput;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.system.rev130927.DisconnectEvent;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.system.rev130927.SwitchIdleEvent;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.system.rev130927.SystemNotificationsListener;
  73 import org.opendaylight.yangtools.yang.binding.DataObject;
  74 import org.opendaylight.yangtools.yang.binding.Notification;
  75 import org.opendaylight.yangtools.yang.common.RpcResult;
  76 import org.slf4j.Logger;
  77 import org.slf4j.LoggerFactory;
  78
  79 /**
  80  * Handles messages (notifications + rpcs) and connections
  81  * @author mirehak
  82  * @author michal.polkorab
  83  */
  84 public class ConnectionAdapterImpl implements ConnectionFacade {
  85     /** after this time, RPC future response objects will be thrown away (in minutes) */
  86     public static final int RPC_RESPONSE_EXPIRATION = 1;
  87
  88     /**
  89      * Default depth of write queue, e.g. we allow these many messages
  90      * to be queued up before blocking producers.
  91      */
  92     public static final int DEFAULT_QUEUE_DEPTH = 1024;
  93
  94     private static final Logger LOG = LoggerFactory
  95             .getLogger(ConnectionAdapterImpl.class);
  96     private static final Exception QUEUE_FULL_EXCEPTION =
  97             new RejectedExecutionException("Output queue is full");
  98
  99     private static final RemovalListener<RpcResponseKey, ResponseExpectedRpcListener<?>> REMOVAL_LISTENER =
 100             new RemovalListener<RpcResponseKey, ResponseExpectedRpcListener<?>>() {
 101         @Override
 102         public void onRemoval(
 103                 final RemovalNotification<RpcResponseKey, ResponseExpectedRpcListener<?>> notification) {
 104             if (! notification.getCause().equals(RemovalCause.EXPLICIT)) {
 105                 notification.getValue().discard();
 106             }
 107         }
 108     };
 109
 110     /** expiring cache for future rpcResponses */
 111     private Cache<RpcResponseKey, ResponseExpectedRpcListener<?>> responseCache;
 112
 113     private final ChannelOutboundQueue output;
 114     private final Channel channel;
 115
 116     private ConnectionReadyListener connectionReadyListener;
 117     private OpenflowProtocolListener messageListener;
 118     private SystemNotificationsListener systemListener;
 119     private OutboundQueueManager<?> outputManager;
 120     private boolean disconnectOccured = false;
 121     private final StatisticsCounters statisticsCounters;
 122     private OFVersionDetector versionDetector;
 123     private final InetSocketAddress address;
 124
 125     /**
 126      * default ctor
 127      * @param channel the channel to be set - used for communication
 128      * @param address client address (used only in case of UDP communication,
 129      *  as there is no need to store address over tcp (stable channel))
 130      */
 131     public ConnectionAdapterImpl(final Channel channel, final InetSocketAddress address) {
 132         responseCache = CacheBuilder.newBuilder()
 133                 .concurrencyLevel(1)
 134                 .expireAfterWrite(RPC_RESPONSE_EXPIRATION, TimeUnit.MINUTES)
 135                 .removalListener(REMOVAL_LISTENER).build();
 136         this.channel = Preconditions.checkNotNull(channel);
 137         this.output = new ChannelOutboundQueue(channel, DEFAULT_QUEUE_DEPTH, address);
 138         this.address = address;
 139         channel.pipeline().addLast(output);
 140         statisticsCounters = StatisticsCounters.getInstance();
 141
 142         LOG.debug("ConnectionAdapter created");
 143     }
 144
 145     @Override
 146     public Future<RpcResult<BarrierOutput>> barrier(final BarrierInput input) {
 147         return sendToSwitchExpectRpcResultFuture(
 148                 input, BarrierOutput.class, "barrier-input sending failed");
 149     }
 150
 151     @Override
 152     public Future<RpcResult<EchoOutput>> echo(final EchoInput input) {
 153         return sendToSwitchExpectRpcResultFuture(
 154                 input, EchoOutput.class, "echo-input sending failed");
 155     }
 156
 157     @Override
 158     public Future<RpcResult<Void>> echoReply(final EchoReplyInput input) {
 159         return sendToSwitchFuture(input, "echo-reply sending failed");
 160     }
 161
 162     @Override
 163     public Future<RpcResult<Void>> experimenter(final ExperimenterInput input) {
 164         return sendToSwitchFuture(input, "experimenter sending failed");
 165     }
 166
 167     @Override
 168     public Future<RpcResult<Void>> flowMod(final FlowModInput input) {
 169         statisticsCounters.incrementCounter(CounterEventTypes.DS_FLOW_MODS_ENTERED);
 170         return sendToSwitchFuture(input, "flow-mod sending failed");
 171     }
 172
 173     @Override
 174     public Future<RpcResult<GetConfigOutput>> getConfig(final GetConfigInput input) {
 175         return sendToSwitchExpectRpcResultFuture(
 176                 input, GetConfigOutput.class, "get-config-input sending failed");
 177     }
 178
 179     @Override
 180     public Future<RpcResult<GetFeaturesOutput>> getFeatures(
 181             final GetFeaturesInput input) {
 182         return sendToSwitchExpectRpcResultFuture(
 183                 input, GetFeaturesOutput.class, "get-features-input sending failed");
 184     }
 185
 186     @Override
 187     public Future<RpcResult<GetQueueConfigOutput>> getQueueConfig(
 188             final GetQueueConfigInput input) {
 189         return sendToSwitchExpectRpcResultFuture(
 190                 input, GetQueueConfigOutput.class, "get-queue-config-input sending failed");
 191     }
 192
 193     @Override
 194     public Future<RpcResult<Void>> groupMod(final GroupModInput input) {
 195         return sendToSwitchFuture(input, "group-mod-input sending failed");
 196     }
 197
 198     @Override
 199     public Future<RpcResult<Void>> hello(final HelloInput input) {
 200         return sendToSwitchFuture(input, "hello-input sending failed");
 201     }
 202
 203     @Override
 204     public Future<RpcResult<Void>> meterMod(final MeterModInput input) {
 205         return sendToSwitchFuture(input, "meter-mod-input sending failed");
 206     }
 207
 208     @Override
 209     public Future<RpcResult<Void>> packetOut(final PacketOutInput input) {
 210         return sendToSwitchFuture(input, "packet-out-input sending failed");
 211     }
 212
 213     @Override
 214     public Future<RpcResult<Void>> multipartRequest(final MultipartRequestInput input) {
 215         return sendToSwitchFuture(input, "multi-part-request sending failed");
 216     }
 217
 218     @Override
 219     public Future<RpcResult<Void>> portMod(final PortModInput input) {
 220         return sendToSwitchFuture(input, "port-mod-input sending failed");
 221     }
 222
 223     @Override
 224     public Future<RpcResult<RoleRequestOutput>> roleRequest(
 225             final RoleRequestInput input) {
 226         return sendToSwitchExpectRpcResultFuture(
 227                 input, RoleRequestOutput.class, "role-request-config-input sending failed");
 228     }
 229
 230     @Override
 231     public Future<RpcResult<Void>> setConfig(final SetConfigInput input) {
 232         return sendToSwitchFuture(input, "set-config-input sending failed");
 233     }
 234
 235     @Override
 236     public Future<RpcResult<Void>> tableMod(final TableModInput input) {
 237         return sendToSwitchFuture(input, "table-mod-input sending failed");
 238     }
 239
 240     @Override
 241     public Future<RpcResult<GetAsyncOutput>> getAsync(final GetAsyncInput input) {
 242         return sendToSwitchExpectRpcResultFuture(
 243                 input, GetAsyncOutput.class, "get-async-input sending failed");
 244     }
 245
 246     @Override
 247     public Future<RpcResult<Void>> setAsync(final SetAsyncInput input) {
 248         return sendToSwitchFuture(input, "set-async-input sending failed");
 249     }
 250
 251     @Override
 252     public Future<Boolean> disconnect() {
 253         ChannelFuture disconnectResult = channel.disconnect();
 254         responseCache.invalidateAll();
 255         disconnectOccured = true;
 256
 257         return handleTransportChannelFuture(disconnectResult);
 258     }
 259
 260     @Override
 261     public boolean isAlive() {
 262         return channel.isOpen();
 263     }
 264
 265     @Override
 266     public void setMessageListener(final OpenflowProtocolListener messageListener) {
 267         this.messageListener = messageListener;
 268     }
 269
 270     @Override
 271     public void consume(final DataObject message) {
 272         LOG.debug("ConsumeIntern msg on {}", channel);
 273         if (disconnectOccured ) {
 274             return;
 275         }
 276         if (message instanceof Notification) {
 277
 278             // System events
 279             if (message instanceof DisconnectEvent) {
 280                 systemListener.onDisconnectEvent((DisconnectEvent) message);
 281                 responseCache.invalidateAll();
 282                 disconnectOccured = true;
 283             } else if (message instanceof SwitchIdleEvent) {
 284                 systemListener.onSwitchIdleEvent((SwitchIdleEvent) message);
 285                 // OpenFlow messages
 286             } else if (message instanceof EchoRequestMessage) {
 287                 if (outputManager != null) {
 288                     outputManager.onEchoRequest((EchoRequestMessage) message);
 289                 } else {
 290                     messageListener.onEchoRequestMessage((EchoRequestMessage) message);
 291                 }
 292                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 293             } else if (message instanceof ErrorMessage) {
 294                 // Send only unmatched errors
 295                 if (outputManager == null || !outputManager.onMessage((OfHeader) message)) {
 296                     messageListener.onErrorMessage((ErrorMessage) message);
 297                 }
 298                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 299             } else if (message instanceof ExperimenterMessage) {
 300                 if (outputManager != null) {
 301                     outputManager.onMessage((OfHeader) message);
 302                 }
 303                 messageListener.onExperimenterMessage((ExperimenterMessage) message);
 304                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 305             } else if (message instanceof FlowRemovedMessage) {
 306                 messageListener.onFlowRemovedMessage((FlowRemovedMessage) message);
 307                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 308             } else if (message instanceof HelloMessage) {
 309                 LOG.info("Hello received / branch");
 310                 messageListener.onHelloMessage((HelloMessage) message);
 311                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 312             } else if (message instanceof MultipartReplyMessage) {
 313                 if (outputManager != null) {
 314                     outputManager.onMessage((OfHeader) message);
 315                 }
 316                 messageListener.onMultipartReplyMessage((MultipartReplyMessage) message);
 317                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 318             } else if (message instanceof PacketInMessage) {
 319                 messageListener.onPacketInMessage((PacketInMessage) message);
 320                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 321             } else if (message instanceof PortStatusMessage) {
 322                 messageListener.onPortStatusMessage((PortStatusMessage) message);
 323                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 324             } else {
 325                 LOG.warn("message listening not supported for type: {}", message.getClass());
 326             }
 327         } else if (message instanceof OfHeader) {
 328             LOG.debug("OFheader msg received");
 329
 330             if (outputManager == null || !outputManager.onMessage((OfHeader) message)) {
 331                 RpcResponseKey key = createRpcResponseKey((OfHeader) message);
 332                 final ResponseExpectedRpcListener<?> listener = findRpcResponse(key);
 333                 if (listener != null) {
 334                     LOG.debug("corresponding rpcFuture found");
 335                     listener.completed((OfHeader)message);
 336                     statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 337                     LOG.debug("after setting rpcFuture");
 338                     responseCache.invalidate(key);
 339                 } else {
 340                     LOG.warn("received unexpected rpc response: {}", key);
 341                 }
 342             }
 343         } else {
 344             LOG.warn("message listening not supported for type: {}", message.getClass());
 345         }
 346     }
 347
 348     private <T> ListenableFuture<RpcResult<T>> enqueueMessage(final AbstractRpcListener<T> promise) {
 349         LOG.debug("Submitting promise {}", promise);
 350
 351         if (!output.enqueue(promise)) {
 352             LOG.debug("Message queue is full, rejecting execution");
 353             promise.failedRpc(QUEUE_FULL_EXCEPTION);
 354         } else {
 355             LOG.debug("Promise enqueued successfully");
 356         }
 357
 358         return promise.getResult();
 359     }
 360
 361     /**
 362      * sends given message to switch, sending result will be reported via return value
 363      * @param input message to send
 364      * @param failureInfo describes, what type of message caused failure by sending
 365      * @return future object, <ul>
 366      *  <li>if send successful, {@link RpcResult} without errors and successful
 367      *  status will be returned, </li>
 368      *  <li>else {@link RpcResult} will contain errors and failed status</li>
 369      *  </ul>
 370      */
 371     private ListenableFuture<RpcResult<Void>> sendToSwitchFuture(
 372             final DataObject input, final String failureInfo) {
 373         statisticsCounters.incrementCounter(CounterEventTypes.DS_ENTERED_OFJAVA);
 374         return enqueueMessage(new SimpleRpcListener(input, failureInfo));
 375     }
 376
 377     /**
 378      * sends given message to switch, sending result or switch response will be reported via return value
 379      * @param input message to send
 380      * @param responseClazz type of response
 381      * @param failureInfo describes, what type of message caused failure by sending
 382      * @return future object, <ul>
 383      *  <li>if send fails, {@link RpcResult} will contain errors and failed status </li>
 384      *  <li>else {@link RpcResult} will be stored in responseCache and wait for particular timeout
 385      *  ({@link ConnectionAdapterImpl#RPC_RESPONSE_EXPIRATION}),
 386      *  <ul><li>either switch will manage to answer
 387      *  and then corresponding response message will be set into returned future</li>
 388      *  <li>or response in cache will expire and returned future will be cancelled</li></ul>
 389      *  </li>
 390      *  </ul>
 391      */
 392     private <IN extends OfHeader, OUT extends OfHeader> ListenableFuture<RpcResult<OUT>> sendToSwitchExpectRpcResultFuture(
 393             final IN input, final Class<OUT> responseClazz, final String failureInfo) {
 394         final RpcResponseKey key = new RpcResponseKey(input.getXid(), responseClazz.getName());
 395         final ResponseExpectedRpcListener<OUT> listener =
 396                 new ResponseExpectedRpcListener<>(input, failureInfo, responseCache, key);
 397         statisticsCounters.incrementCounter(CounterEventTypes.DS_ENTERED_OFJAVA);
 398         return enqueueMessage(listener);
 399     }
 400
 401     /**
 402      * @param resultFuture
 403      * @param failureInfo
 404      * @param errorSeverity
 405      * @param message
 406      * @return
 407      */
 408     private static SettableFuture<Boolean> handleTransportChannelFuture(
 409             final ChannelFuture resultFuture) {
 410
 411         final SettableFuture<Boolean> transportResult = SettableFuture.create();
 412
 413         resultFuture.addListener(new GenericFutureListener<io.netty.util.concurrent.Future<? super Void>>() {
 414
 415             @Override
 416             public void operationComplete(
 417                     final io.netty.util.concurrent.Future<? super Void> future)
 418                     throws Exception {
 419                 transportResult.set(future.isSuccess());
 420                 if (!future.isSuccess()) {
 421                     transportResult.setException(future.cause());
 422                 }
 423             }
 424         });
 425         return transportResult;
 426     }
 427
 428     /**
 429      * @param message
 430      * @return
 431      */
 432     private static RpcResponseKey createRpcResponseKey(final OfHeader message) {
 433         return new RpcResponseKey(message.getXid(), message.getImplementedInterface().getName());
 434     }
 435
 436     /**
 437      * @return
 438      */
 439     private ResponseExpectedRpcListener<?> findRpcResponse(final RpcResponseKey key) {
 440         return responseCache.getIfPresent(key);
 441     }
 442
 443     @Override
 444     public void setSystemListener(final SystemNotificationsListener systemListener) {
 445         this.systemListener = systemListener;
 446     }
 447
 448     @Override
 449     public void checkListeners() {
 450         final StringBuilder buffer =  new StringBuilder();
 451         if (systemListener == null) {
 452             buffer.append("SystemListener ");
 453         }
 454         if (messageListener == null) {
 455             buffer.append("MessageListener ");
 456         }
 457         if (connectionReadyListener == null) {
 458             buffer.append("ConnectionReadyListener ");
 459         }
 460
 461         Preconditions.checkState(buffer.length() == 0, "Missing listeners: %s", buffer.toString());
 462     }
 463
 464     @Override
 465     public void fireConnectionReadyNotification() {
 466         versionDetector = (OFVersionDetector) channel.pipeline().get(PipelineHandlers.OF_VERSION_DETECTOR.name());
 467         Preconditions.checkState(versionDetector != null);
 468
 469         new Thread(new Runnable() {
 470             @Override
 471             public void run() {
 472                 connectionReadyListener.onConnectionReady();
 473             }
 474         }).start();
 475     }
 476
 477     @Override
 478     public void setConnectionReadyListener(
 479             final ConnectionReadyListener connectionReadyListener) {
 480         this.connectionReadyListener = connectionReadyListener;
 481     }
 482
 483     @Override
 484     public InetSocketAddress getRemoteAddress() {
 485         return (InetSocketAddress) channel.remoteAddress();
 486     }
 487
 488     /**
 489      * Used only for testing purposes
 490      * @param cache
 491      */
 492     public void setResponseCache(final Cache<RpcResponseKey, ResponseExpectedRpcListener<?>> cache) {
 493         this.responseCache = cache;
 494     }
 495
 496         @Override
 497     public boolean isAutoRead() {
 498         return channel.config().isAutoRead();
 499     }
 500
 501         @Override
 502     public void setAutoRead(final boolean autoRead) {
 503         channel.config().setAutoRead(autoRead);
 504     }
 505
 506     @Override
 507     public <T extends OutboundQueueHandler> OutboundQueueHandlerRegistration<T> registerOutboundQueueHandler(
 508             final T handler, final int maxQueueDepth, final long maxBarrierNanos) {
 509         Preconditions.checkState(outputManager == null, "Manager %s already registered", outputManager);
 510
 511         final OutboundQueueManager<T> ret = new OutboundQueueManager<>(this, address, handler, OutboundQueueCache.getInstance().getSlice(maxQueueDepth), maxBarrierNanos);
 512         outputManager = ret;
 513         channel.pipeline().addLast(outputManager);
 514
 515         return new OutboundQueueHandlerRegistrationImpl<T>(handler) {
 516             @Override
 517             protected void removeRegistration() {
 518                 outputManager.close();
 519                 channel.pipeline().remove(outputManager);
 520                 outputManager = null;
 521             }
 522         };
 523     }
 524
 525     Channel getChannel() {
 526         return channel;
 527     }
 528
 529     @Override
 530     public void setPacketInFiltering(final boolean enabled) {
 531         versionDetector.setFilterPacketIns(enabled);
 532         LOG.debug("PacketIn filtering {}abled", enabled ? "en" : "dis");
 533     }
 534 }