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     private final boolean useBarrier;
 126
 127     /**
 128      * default ctor
 129      * @param channel the channel to be set - used for communication
 130      * @param address client address (used only in case of UDP communication,
 131      *  as there is no need to store address over tcp (stable channel))
 132      */
 133     public ConnectionAdapterImpl(final Channel channel, final InetSocketAddress address, final boolean useBarrier) {
 134         this.channel = Preconditions.checkNotNull(channel);
 135         this.output = new ChannelOutboundQueue(channel, DEFAULT_QUEUE_DEPTH, address);
 136         this.address = address;
 137
 138         responseCache = CacheBuilder.newBuilder()
 139                 .concurrencyLevel(1)
 140                 .expireAfterWrite(RPC_RESPONSE_EXPIRATION, TimeUnit.MINUTES)
 141                 .removalListener(REMOVAL_LISTENER).build();
 142
 143         this.useBarrier = useBarrier;
 144         channel.pipeline().addLast(output);
 145         statisticsCounters = StatisticsCounters.getInstance();
 146
 147         LOG.debug("ConnectionAdapter created");
 148     }
 149
 150     @Override
 151     public Future<RpcResult<BarrierOutput>> barrier(final BarrierInput input) {
 152         return sendToSwitchExpectRpcResultFuture(
 153                 input, BarrierOutput.class, "barrier-input sending failed");
 154     }
 155
 156     @Override
 157     public Future<RpcResult<EchoOutput>> echo(final EchoInput input) {
 158         return sendToSwitchExpectRpcResultFuture(
 159                 input, EchoOutput.class, "echo-input sending failed");
 160     }
 161
 162     @Override
 163     public Future<RpcResult<Void>> echoReply(final EchoReplyInput input) {
 164         return sendToSwitchFuture(input, "echo-reply sending failed");
 165     }
 166
 167     @Override
 168     public Future<RpcResult<Void>> experimenter(final ExperimenterInput input) {
 169         return sendToSwitchFuture(input, "experimenter sending failed");
 170     }
 171
 172     @Override
 173     public Future<RpcResult<Void>> flowMod(final FlowModInput input) {
 174         statisticsCounters.incrementCounter(CounterEventTypes.DS_FLOW_MODS_ENTERED);
 175         return sendToSwitchFuture(input, "flow-mod sending failed");
 176     }
 177
 178     @Override
 179     public Future<RpcResult<GetConfigOutput>> getConfig(final GetConfigInput input) {
 180         return sendToSwitchExpectRpcResultFuture(
 181                 input, GetConfigOutput.class, "get-config-input sending failed");
 182     }
 183
 184     @Override
 185     public Future<RpcResult<GetFeaturesOutput>> getFeatures(
 186             final GetFeaturesInput input) {
 187         return sendToSwitchExpectRpcResultFuture(
 188                 input, GetFeaturesOutput.class, "get-features-input sending failed");
 189     }
 190
 191     @Override
 192     public Future<RpcResult<GetQueueConfigOutput>> getQueueConfig(
 193             final GetQueueConfigInput input) {
 194         return sendToSwitchExpectRpcResultFuture(
 195                 input, GetQueueConfigOutput.class, "get-queue-config-input sending failed");
 196     }
 197
 198     @Override
 199     public Future<RpcResult<Void>> groupMod(final GroupModInput input) {
 200         return sendToSwitchFuture(input, "group-mod-input sending failed");
 201     }
 202
 203     @Override
 204     public Future<RpcResult<Void>> hello(final HelloInput input) {
 205         return sendToSwitchFuture(input, "hello-input sending failed");
 206     }
 207
 208     @Override
 209     public Future<RpcResult<Void>> meterMod(final MeterModInput input) {
 210         return sendToSwitchFuture(input, "meter-mod-input sending failed");
 211     }
 212
 213     @Override
 214     public Future<RpcResult<Void>> packetOut(final PacketOutInput input) {
 215         return sendToSwitchFuture(input, "packet-out-input sending failed");
 216     }
 217
 218     @Override
 219     public Future<RpcResult<Void>> multipartRequest(final MultipartRequestInput input) {
 220         return sendToSwitchFuture(input, "multi-part-request sending failed");
 221     }
 222
 223     @Override
 224     public Future<RpcResult<Void>> portMod(final PortModInput input) {
 225         return sendToSwitchFuture(input, "port-mod-input sending failed");
 226     }
 227
 228     @Override
 229     public Future<RpcResult<RoleRequestOutput>> roleRequest(
 230             final RoleRequestInput input) {
 231         return sendToSwitchExpectRpcResultFuture(
 232                 input, RoleRequestOutput.class, "role-request-config-input sending failed");
 233     }
 234
 235     @Override
 236     public Future<RpcResult<Void>> setConfig(final SetConfigInput input) {
 237         return sendToSwitchFuture(input, "set-config-input sending failed");
 238     }
 239
 240     @Override
 241     public Future<RpcResult<Void>> tableMod(final TableModInput input) {
 242         return sendToSwitchFuture(input, "table-mod-input sending failed");
 243     }
 244
 245     @Override
 246     public Future<RpcResult<GetAsyncOutput>> getAsync(final GetAsyncInput input) {
 247         return sendToSwitchExpectRpcResultFuture(
 248                 input, GetAsyncOutput.class, "get-async-input sending failed");
 249     }
 250
 251     @Override
 252     public Future<RpcResult<Void>> setAsync(final SetAsyncInput input) {
 253         return sendToSwitchFuture(input, "set-async-input sending failed");
 254     }
 255
 256     @Override
 257     public Future<Boolean> disconnect() {
 258         final ChannelFuture disconnectResult = channel.disconnect();
 259         responseCache.invalidateAll();
 260         disconnectOccured = true;
 261
 262         return handleTransportChannelFuture(disconnectResult);
 263     }
 264
 265     @Override
 266     public boolean isAlive() {
 267         return channel.isOpen();
 268     }
 269
 270     @Override
 271     public void setMessageListener(final OpenflowProtocolListener messageListener) {
 272         this.messageListener = messageListener;
 273     }
 274
 275     @Override
 276     public void consume(final DataObject message) {
 277         LOG.debug("ConsumeIntern msg on {}", channel);
 278         if (disconnectOccured ) {
 279             return;
 280         }
 281         if (message instanceof Notification) {
 282
 283             // System events
 284             if (message instanceof DisconnectEvent) {
 285                 systemListener.onDisconnectEvent((DisconnectEvent) message);
 286                 responseCache.invalidateAll();
 287                 disconnectOccured = true;
 288             } else if (message instanceof SwitchIdleEvent) {
 289                 systemListener.onSwitchIdleEvent((SwitchIdleEvent) message);
 290                 // OpenFlow messages
 291             } else if (message instanceof EchoRequestMessage) {
 292                 if (outputManager != null) {
 293                     outputManager.onEchoRequest((EchoRequestMessage) message);
 294                 } else {
 295                     messageListener.onEchoRequestMessage((EchoRequestMessage) message);
 296                 }
 297                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 298             } else if (message instanceof ErrorMessage) {
 299                 // Send only unmatched errors
 300                 if (outputManager == null || !outputManager.onMessage((OfHeader) message)) {
 301                     messageListener.onErrorMessage((ErrorMessage) message);
 302                 }
 303                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 304             } else if (message instanceof ExperimenterMessage) {
 305                 if (outputManager != null) {
 306                     outputManager.onMessage((OfHeader) message);
 307                 }
 308                 messageListener.onExperimenterMessage((ExperimenterMessage) message);
 309                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 310             } else if (message instanceof FlowRemovedMessage) {
 311                 messageListener.onFlowRemovedMessage((FlowRemovedMessage) message);
 312                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 313             } else if (message instanceof HelloMessage) {
 314                 LOG.info("Hello received / branch");
 315                 messageListener.onHelloMessage((HelloMessage) message);
 316                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 317             } else if (message instanceof MultipartReplyMessage) {
 318                 if (outputManager != null) {
 319                     outputManager.onMessage((OfHeader) message);
 320                 }
 321                 messageListener.onMultipartReplyMessage((MultipartReplyMessage) message);
 322                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 323             } else if (message instanceof PacketInMessage) {
 324                 messageListener.onPacketInMessage((PacketInMessage) message);
 325                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 326             } else if (message instanceof PortStatusMessage) {
 327                 messageListener.onPortStatusMessage((PortStatusMessage) message);
 328                 statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 329             } else {
 330                 LOG.warn("message listening not supported for type: {}", message.getClass());
 331             }
 332         } else if (message instanceof OfHeader) {
 333             LOG.debug("OFheader msg received");
 334
 335             if (outputManager == null || !outputManager.onMessage((OfHeader) message)) {
 336                 final RpcResponseKey key = createRpcResponseKey((OfHeader) message);
 337                 final ResponseExpectedRpcListener<?> listener = findRpcResponse(key);
 338                 if (listener != null) {
 339                     LOG.debug("corresponding rpcFuture found");
 340                     listener.completed((OfHeader)message);
 341                     statisticsCounters.incrementCounter(CounterEventTypes.US_MESSAGE_PASS);
 342                     LOG.debug("after setting rpcFuture");
 343                     responseCache.invalidate(key);
 344                 } else {
 345                     LOG.warn("received unexpected rpc response: {}", key);
 346                 }
 347             }
 348         } else {
 349             LOG.warn("message listening not supported for type: {}", message.getClass());
 350         }
 351     }
 352
 353     private <T> ListenableFuture<RpcResult<T>> enqueueMessage(final AbstractRpcListener<T> promise) {
 354         LOG.debug("Submitting promise {}", promise);
 355
 356         if (!output.enqueue(promise)) {
 357             LOG.debug("Message queue is full, rejecting execution");
 358             promise.failedRpc(QUEUE_FULL_EXCEPTION);
 359         } else {
 360             LOG.debug("Promise enqueued successfully");
 361         }
 362
 363         return promise.getResult();
 364     }
 365
 366     /**
 367      * sends given message to switch, sending result will be reported via return value
 368      * @param input message to send
 369      * @param failureInfo describes, what type of message caused failure by sending
 370      * @return future object, <ul>
 371      *  <li>if send successful, {@link RpcResult} without errors and successful
 372      *  status will be returned, </li>
 373      *  <li>else {@link RpcResult} will contain errors and failed status</li>
 374      *  </ul>
 375      */
 376     private ListenableFuture<RpcResult<Void>> sendToSwitchFuture(
 377             final DataObject input, final String failureInfo) {
 378         statisticsCounters.incrementCounter(CounterEventTypes.DS_ENTERED_OFJAVA);
 379         return enqueueMessage(new SimpleRpcListener(input, failureInfo));
 380     }
 381
 382     /**
 383      * sends given message to switch, sending result or switch response will be reported via return value
 384      * @param input message to send
 385      * @param responseClazz type of response
 386      * @param failureInfo describes, what type of message caused failure by sending
 387      * @return future object, <ul>
 388      *  <li>if send fails, {@link RpcResult} will contain errors and failed status </li>
 389      *  <li>else {@link RpcResult} will be stored in responseCache and wait for particular timeout
 390      *  ({@link ConnectionAdapterImpl#RPC_RESPONSE_EXPIRATION}),
 391      *  <ul><li>either switch will manage to answer
 392      *  and then corresponding response message will be set into returned future</li>
 393      *  <li>or response in cache will expire and returned future will be cancelled</li></ul>
 394      *  </li>
 395      *  </ul>
 396      */
 397     private <IN extends OfHeader, OUT extends OfHeader> ListenableFuture<RpcResult<OUT>> sendToSwitchExpectRpcResultFuture(
 398             final IN input, final Class<OUT> responseClazz, final String failureInfo) {
 399         final RpcResponseKey key = new RpcResponseKey(input.getXid(), responseClazz.getName());
 400         final ResponseExpectedRpcListener<OUT> listener =
 401                 new ResponseExpectedRpcListener<>(input, failureInfo, responseCache, key);
 402         statisticsCounters.incrementCounter(CounterEventTypes.DS_ENTERED_OFJAVA);
 403         return enqueueMessage(listener);
 404     }
 405
 406     /**
 407      * @param resultFuture
 408      * @param failureInfo
 409      * @param errorSeverity
 410      * @param message
 411      * @return
 412      */
 413     private static SettableFuture<Boolean> handleTransportChannelFuture(
 414             final ChannelFuture resultFuture) {
 415
 416         final SettableFuture<Boolean> transportResult = SettableFuture.create();
 417
 418         resultFuture.addListener(new GenericFutureListener<io.netty.util.concurrent.Future<? super Void>>() {
 419
 420             @Override
 421             public void operationComplete(
 422                     final io.netty.util.concurrent.Future<? super Void> future)
 423                     throws Exception {
 424                 transportResult.set(future.isSuccess());
 425                 if (!future.isSuccess()) {
 426                     transportResult.setException(future.cause());
 427                 }
 428             }
 429         });
 430         return transportResult;
 431     }
 432
 433     /**
 434      * @param message
 435      * @return
 436      */
 437     private static RpcResponseKey createRpcResponseKey(final OfHeader message) {
 438         return new RpcResponseKey(message.getXid(), message.getImplementedInterface().getName());
 439     }
 440
 441     /**
 442      * @return
 443      */
 444     private ResponseExpectedRpcListener<?> findRpcResponse(final RpcResponseKey key) {
 445         return responseCache.getIfPresent(key);
 446     }
 447
 448     @Override
 449     public void setSystemListener(final SystemNotificationsListener systemListener) {
 450         this.systemListener = systemListener;
 451     }
 452
 453     @Override
 454     public void checkListeners() {
 455         final StringBuilder buffer =  new StringBuilder();
 456         if (systemListener == null) {
 457             buffer.append("SystemListener ");
 458         }
 459         if (messageListener == null) {
 460             buffer.append("MessageListener ");
 461         }
 462         if (connectionReadyListener == null) {
 463             buffer.append("ConnectionReadyListener ");
 464         }
 465
 466         Preconditions.checkState(buffer.length() == 0, "Missing listeners: %s", buffer.toString());
 467     }
 468
 469     @Override
 470     public void fireConnectionReadyNotification() {
 471         versionDetector = (OFVersionDetector) channel.pipeline().get(PipelineHandlers.OF_VERSION_DETECTOR.name());
 472         Preconditions.checkState(versionDetector != null);
 473
 474         new Thread(new Runnable() {
 475             @Override
 476             public void run() {
 477                 connectionReadyListener.onConnectionReady();
 478             }
 479         }).start();
 480     }
 481
 482     @Override
 483     public void setConnectionReadyListener(
 484             final ConnectionReadyListener connectionReadyListener) {
 485         this.connectionReadyListener = connectionReadyListener;
 486     }
 487
 488     @Override
 489     public InetSocketAddress getRemoteAddress() {
 490         return (InetSocketAddress) channel.remoteAddress();
 491     }
 492
 493     /**
 494      * Used only for testing purposes
 495      * @param cache
 496      */
 497     public void setResponseCache(final Cache<RpcResponseKey, ResponseExpectedRpcListener<?>> cache) {
 498         this.responseCache = cache;
 499     }
 500
 501         @Override
 502     public boolean isAutoRead() {
 503         return channel.config().isAutoRead();
 504     }
 505
 506         @Override
 507     public void setAutoRead(final boolean autoRead) {
 508         channel.config().setAutoRead(autoRead);
 509     }
 510
 511     @Override
 512     public <T extends OutboundQueueHandler> OutboundQueueHandlerRegistration<T> registerOutboundQueueHandler(
 513             final T handler, final int maxQueueDepth, final long maxBarrierNanos) {
 514         Preconditions.checkState(outputManager == null, "Manager %s already registered", outputManager);
 515
 516         if (useBarrier) {
 517
 518         }
 519
 520         final OutboundQueueManager<T> ret = new OutboundQueueManager<>(this, address, handler, maxQueueDepth, maxBarrierNanos);
 521         outputManager = ret;
 522         channel.pipeline().addLast(outputManager);
 523
 524         return new OutboundQueueHandlerRegistrationImpl<T>(handler) {
 525             @Override
 526             protected void removeRegistration() {
 527                 outputManager.close();
 528                 channel.pipeline().remove(outputManager);
 529                 outputManager = null;
 530             }
 531         };
 532     }
 533
 534     Channel getChannel() {
 535         return channel;
 536     }
 537
 538     @Override
 539     public void setPacketInFiltering(final boolean enabled) {
 540         versionDetector.setFilterPacketIns(enabled);
 541         LOG.debug("PacketIn filtering {}abled", enabled ? "en" : "dis");
 542     }
 543 }