openflowplugin/src/main/java/org/opendaylight/openflowplugin/openflow/md/core/MDController.java

   1 /**
   2  * Copyright (c) 2013 Cisco Systems, Inc. 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 package org.opendaylight.openflowplugin.openflow.md.core;
  10
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.LinkedHashSet;
  14 import java.util.List;
  15 import java.util.Map;
  16 import java.util.concurrent.BlockingQueue;
  17 import java.util.concurrent.ConcurrentHashMap;
  18 import java.util.concurrent.ConcurrentMap;
  19 import java.util.concurrent.ExecutionException;
  20 import java.util.concurrent.Future;
  21 import java.util.concurrent.LinkedBlockingQueue;
  22 import java.util.concurrent.RejectedExecutionException;
  23 import java.util.concurrent.RejectedExecutionHandler;
  24 import java.util.concurrent.ThreadPoolExecutor;
  25 import java.util.concurrent.TimeUnit;
  26 import java.util.concurrent.TimeoutException;
  27
  28 import org.opendaylight.openflowjava.protocol.api.connection.ConnectionConfiguration;
  29 import org.opendaylight.openflowjava.protocol.spi.connection.SwitchConnectionProvider;
  30 import org.opendaylight.openflowplugin.openflow.md.OFConstants;
  31 import org.opendaylight.openflowplugin.openflow.md.core.session.OFSessionUtil;
  32 import org.opendaylight.openflowplugin.openflow.md.core.translator.ErrorTranslator;
  33 import org.opendaylight.openflowplugin.openflow.md.core.translator.ErrorV10Translator;
  34 import org.opendaylight.openflowplugin.openflow.md.core.translator.ExperimenterTranslator;
  35 import org.opendaylight.openflowplugin.openflow.md.core.translator.FeaturesV10ToNodeConnectorUpdatedTranslator;
  36 import org.opendaylight.openflowplugin.openflow.md.core.translator.FlowRemovedTranslator;
  37 import org.opendaylight.openflowplugin.openflow.md.core.translator.MultiPartMessageDescToNodeUpdatedTranslator;
  38 import org.opendaylight.openflowplugin.openflow.md.core.translator.MultiPartReplyPortToNodeConnectorUpdatedTranslator;
  39 import org.opendaylight.openflowplugin.openflow.md.core.translator.MultipartReplyTableFeaturesToTableUpdatedTranslator;
  40 import org.opendaylight.openflowplugin.openflow.md.core.translator.MultipartReplyTranslator;
  41 import org.opendaylight.openflowplugin.openflow.md.core.translator.PacketInTranslator;
  42 import org.opendaylight.openflowplugin.openflow.md.core.translator.PacketInV10Translator;
  43 import org.opendaylight.openflowplugin.openflow.md.core.translator.PortStatusMessageToNodeConnectorUpdatedTranslator;
  44 import org.opendaylight.openflowplugin.openflow.md.lldp.LLDPSpeakerPopListener;
  45 import org.opendaylight.openflowplugin.openflow.md.queue.MessageSpy;
  46 import org.opendaylight.openflowplugin.openflow.md.queue.PopListener;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.NodeErrorNotification;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.SwitchFlowRemoved;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.AggregateFlowStatisticsUpdate;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.FlowsStatisticsUpdate;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.table.statistics.rev131215.FlowTableStatisticsUpdate;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.statistics.rev131111.GroupDescStatsUpdated;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.statistics.rev131111.GroupFeaturesUpdated;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.statistics.rev131111.GroupStatisticsUpdated;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorUpdated;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeUpdated;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.meter.statistics.rev131111.MeterConfigStatsUpdated;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.meter.statistics.rev131111.MeterFeaturesUpdated;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.meter.statistics.rev131111.MeterStatisticsUpdated;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.BadActionErrorNotification;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.BadInstructionErrorNotification;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.BadMatchErrorNotification;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.BadRequestErrorNotification;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.ExperimenterErrorNotification;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.FlowModErrorNotification;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.GroupModErrorNotification;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.HelloFailedErrorNotification;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.MeterModErrorNotification;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.PortModErrorNotification;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.QueueOpErrorNotification;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.RoleRequestErrorNotification;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.SwitchConfigErrorNotification;
  73 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.TableFeaturesErrorNotification;
  74 import org.opendaylight.yang.gen.v1.urn.opendaylight.node.error.service.rev140410.TableModErrorNotification;
  75 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.ErrorMessage;
  76 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.ExperimenterMessage;
  77 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FlowRemovedMessage;
  78 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetFeaturesOutput;
  79 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.MultipartReplyMessage;
  80 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  81 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PacketInMessage;
  82 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PortStatusMessage;
  83 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
  84 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.TransmitPacketInput;
  85 import org.opendaylight.yang.gen.v1.urn.opendaylight.port.statistics.rev131214.NodeConnectorStatisticsUpdate;
  86 import org.opendaylight.yang.gen.v1.urn.opendaylight.queue.statistics.rev131216.QueueStatisticsUpdate;
  87 import org.opendaylight.yang.gen.v1.urn.opendaylight.table.service.rev131026.TableUpdated;
  88 import org.opendaylight.yangtools.yang.binding.DataContainer;
  89 import org.opendaylight.yangtools.yang.binding.DataObject;
  90 import org.slf4j.Logger;
  91 import org.slf4j.LoggerFactory;
  92
  93 import com.google.common.collect.Lists;
  94 import com.google.common.util.concurrent.ForwardingBlockingQueue;
  95 import com.google.common.util.concurrent.Futures;
  96 import com.google.common.util.concurrent.ListenableFuture;
  97 import com.google.common.util.concurrent.ListeningExecutorService;
  98 import com.google.common.util.concurrent.MoreExecutors;
  99
 100 /**
 101  *
 102  */
 103 public class MDController implements IMDController, AutoCloseable {
 104
 105     private static final Logger LOG = LoggerFactory.getLogger(MDController.class);
 106
 107     private Collection<SwitchConnectionProvider> switchConnectionProviders;
 108
 109     private ConcurrentMap<TranslatorKey, Collection<IMDMessageTranslator<OfHeader, List<DataObject>>>> messageTranslators;
 110     private Map<Class<? extends DataObject>, Collection<PopListener<DataObject>>> popListeners;
 111     private MessageSpy<DataContainer> messageSpyCounter;
 112
 113     final private int OF10 = OFConstants.OFP_VERSION_1_0;
 114     final private int OF13 = OFConstants.OFP_VERSION_1_3;
 115
 116     private ErrorHandlerSimpleImpl errorHandler;
 117
 118     /**
 119      * @return translator mapping
 120      */
 121     public Map<TranslatorKey, Collection<IMDMessageTranslator<OfHeader, List<DataObject>>>> getMessageTranslators() {
 122         return messageTranslators;
 123     }
 124
 125     /**
 126      * provisioning of translator mapping
 127      */
 128     public void init() {
 129         LOG.debug("init");
 130         messageTranslators = new ConcurrentHashMap<>();
 131         popListeners = new ConcurrentHashMap<>();
 132         //TODO: move registration to factory
 133         addMessageTranslator(ErrorMessage.class, OF10, new ErrorV10Translator());
 134         addMessageTranslator(ErrorMessage.class, OF13, new ErrorTranslator());
 135         addMessageTranslator(FlowRemovedMessage.class, OF10, new FlowRemovedTranslator());
 136         addMessageTranslator(FlowRemovedMessage.class, OF13, new FlowRemovedTranslator());
 137         addMessageTranslator(PacketInMessage.class,OF10, new PacketInV10Translator());
 138         addMessageTranslator(PacketInMessage.class,OF13, new PacketInTranslator());
 139         addMessageTranslator(PortStatusMessage.class,OF10, new PortStatusMessageToNodeConnectorUpdatedTranslator());
 140         addMessageTranslator(PortStatusMessage.class,OF13, new PortStatusMessageToNodeConnectorUpdatedTranslator());
 141         addMessageTranslator(MultipartReplyMessage.class,OF13,new MultiPartReplyPortToNodeConnectorUpdatedTranslator());
 142         addMessageTranslator(MultipartReplyMessage.class,OF10, new MultiPartMessageDescToNodeUpdatedTranslator());
 143         addMessageTranslator(MultipartReplyMessage.class,OF13, new MultiPartMessageDescToNodeUpdatedTranslator());
 144         addMessageTranslator(ExperimenterMessage.class, OF10, new ExperimenterTranslator());
 145         addMessageTranslator(MultipartReplyMessage.class,OF10, new MultipartReplyTranslator());
 146         addMessageTranslator(MultipartReplyMessage.class,OF13, new MultipartReplyTranslator());
 147         addMessageTranslator(MultipartReplyMessage.class,OF13,new MultipartReplyTableFeaturesToTableUpdatedTranslator());
 148         addMessageTranslator(GetFeaturesOutput.class,OF10, new FeaturesV10ToNodeConnectorUpdatedTranslator());
 149
 150         NotificationPopListener<DataObject> notificationPopListener = new NotificationPopListener<DataObject>();
 151         notificationPopListener.setNotificationProviderService(
 152                 OFSessionUtil.getSessionManager().getNotificationProviderService());
 153         notificationPopListener.setMessageSpy(messageSpyCounter);
 154
 155         //TODO: move registration to factory
 156         addMessagePopListener(NodeErrorNotification.class, notificationPopListener);
 157         addMessagePopListener(BadActionErrorNotification.class, notificationPopListener);
 158         addMessagePopListener(BadInstructionErrorNotification.class, notificationPopListener);
 159         addMessagePopListener(BadMatchErrorNotification.class, notificationPopListener);
 160         addMessagePopListener(BadRequestErrorNotification.class, notificationPopListener);
 161         addMessagePopListener(ExperimenterErrorNotification.class, notificationPopListener);
 162         addMessagePopListener(FlowModErrorNotification.class, notificationPopListener);
 163         addMessagePopListener(GroupModErrorNotification.class, notificationPopListener);
 164         addMessagePopListener(HelloFailedErrorNotification.class, notificationPopListener);
 165         addMessagePopListener(MeterModErrorNotification.class, notificationPopListener);
 166         addMessagePopListener(PortModErrorNotification.class, notificationPopListener);
 167         addMessagePopListener(QueueOpErrorNotification.class, notificationPopListener);
 168         addMessagePopListener(RoleRequestErrorNotification.class, notificationPopListener);
 169         addMessagePopListener(SwitchConfigErrorNotification.class, notificationPopListener);
 170         addMessagePopListener(TableFeaturesErrorNotification.class, notificationPopListener);
 171         addMessagePopListener(TableModErrorNotification.class, notificationPopListener);
 172         addMessagePopListener(NodeConnectorUpdated.class,notificationPopListener);
 173         addMessagePopListener(PacketReceived.class,notificationPopListener);
 174         addMessagePopListener(TransmitPacketInput.class, notificationPopListener);
 175         addMessagePopListener(NodeUpdated.class, notificationPopListener);
 176
 177         addMessagePopListener(SwitchFlowRemoved.class, notificationPopListener);
 178         addMessagePopListener(TableUpdated.class, notificationPopListener);
 179
 180         //Notification registration for flow statistics
 181         addMessagePopListener(FlowsStatisticsUpdate.class, notificationPopListener);
 182         addMessagePopListener(AggregateFlowStatisticsUpdate.class, notificationPopListener);
 183
 184         //Notification registrations for group-statistics
 185         addMessagePopListener(GroupStatisticsUpdated.class, notificationPopListener);
 186         addMessagePopListener(GroupFeaturesUpdated.class, notificationPopListener);
 187         addMessagePopListener(GroupDescStatsUpdated.class, notificationPopListener);
 188
 189         //Notification registrations for meter-statistics
 190         addMessagePopListener(MeterStatisticsUpdated.class, notificationPopListener);
 191         addMessagePopListener(MeterConfigStatsUpdated.class, notificationPopListener);
 192         addMessagePopListener(MeterFeaturesUpdated.class, notificationPopListener);
 193
 194         //Notification registration for port-statistics
 195         addMessagePopListener(NodeConnectorStatisticsUpdate.class, notificationPopListener);
 196
 197         //Notification registration for flow-table statistics
 198         addMessagePopListener(FlowTableStatisticsUpdate.class, notificationPopListener);
 199
 200         //Notification registration for queue-statistics
 201         addMessagePopListener(QueueStatisticsUpdate.class, notificationPopListener);
 202
 203         //Notification for LLDPSpeaker
 204         LLDPSpeakerPopListener<DataObject> lldpPopListener  = new LLDPSpeakerPopListener<DataObject>();
 205         addMessagePopListener(NodeConnectorUpdated.class,lldpPopListener);
 206
 207         // Push the updated Listeners to Session Manager which will be then picked up by ConnectionConductor eventually
 208         OFSessionUtil.getSessionManager().setTranslatorMapping(messageTranslators);
 209         OFSessionUtil.getSessionManager().setPopListenerMapping(popListeners);
 210         OFSessionUtil.getSessionManager().setMessageSpy(messageSpyCounter);
 211
 212         // prepare worker pool for rpc
 213         // TODO: get size from configSubsystem
 214         int rpcThreadLimit = 10;
 215         ListeningExecutorService rpcPoolDelegator = createRpcPoolSpyDecorated(rpcThreadLimit, messageSpyCounter);
 216         OFSessionUtil.getSessionManager().setRpcPool(rpcPoolDelegator);
 217
 218     }
 219
 220     /**
 221      * @param rpcThreadLimit
 222      * @param messageSpy
 223      * @return
 224      */
 225     private static ListeningExecutorService createRpcPoolSpyDecorated(final int rpcThreadLimit, final MessageSpy<DataContainer> messageSpy) {
 226         final BlockingQueue<Runnable> delegate = new LinkedBlockingQueue<>(100000);
 227         final BlockingQueue<Runnable> queue = new ForwardingBlockingQueue<Runnable>() {
 228             @Override
 229             protected BlockingQueue<Runnable> delegate() {
 230                 return delegate;
 231             }
 232
 233             @Override
 234             public boolean offer(final Runnable r) {
 235                 // ThreadPoolExecutor will spawn a new thread after core size is reached only
 236                 // if the queue.offer returns false.
 237                 return false;
 238             }
 239         };
 240
 241         ThreadPoolLoggingExecutor rpcPool = new ThreadPoolLoggingExecutor(rpcThreadLimit, rpcThreadLimit, 0L,
 242                 TimeUnit.MILLISECONDS, queue, "OFRpc");
 243         rpcPool.setRejectedExecutionHandler(new RejectedExecutionHandler() {
 244                         @Override
 245                         public void rejectedExecution(final Runnable r, final ThreadPoolExecutor executor) {
 246                                 try {
 247                                         executor.getQueue().put(r);
 248                                 } catch (InterruptedException e) {
 249                                         throw new RejectedExecutionException("Interrupted while waiting on queue", e);
 250                                 }
 251
 252                         }
 253                 });
 254         ListeningExecutorService listeningRpcPool = MoreExecutors.listeningDecorator(rpcPool);
 255         RpcListeningExecutorService rpcPoolDecorated = new RpcListeningExecutorService(listeningRpcPool);
 256         rpcPoolDecorated.setMessageSpy(messageSpy);
 257         return rpcPoolDecorated;
 258     }
 259
 260     /**
 261      * @param switchConnectionProviders
 262      *            the switchConnectionProviders to set
 263      */
 264     public void setSwitchConnectionProviders(final Collection<SwitchConnectionProvider> switchConnectionProviders) {
 265         this.switchConnectionProviders = switchConnectionProviders;
 266     }
 267
 268     /**
 269      * Function called by dependency manager after "init ()" is called and after
 270      * the services provided by the class are registered in the service registry
 271      *
 272      */
 273     public void start() {
 274         LOG.debug("starting ..");
 275         LOG.debug("switchConnectionProvider: " + switchConnectionProviders);
 276         // setup handler
 277         SwitchConnectionHandlerImpl switchConnectionHandler = new SwitchConnectionHandlerImpl();
 278         switchConnectionHandler.setMessageSpy(messageSpyCounter);
 279
 280         errorHandler = new ErrorHandlerSimpleImpl();
 281
 282         switchConnectionHandler.setErrorHandler(errorHandler);
 283         switchConnectionHandler.init();
 284
 285         List<ListenableFuture<Boolean>> starterChain = new ArrayList<>(switchConnectionProviders.size());
 286         for (SwitchConnectionProvider switchConnectionPrv : switchConnectionProviders) {
 287             switchConnectionPrv.setSwitchConnectionHandler(switchConnectionHandler);
 288             ListenableFuture<Boolean> isOnlineFuture = switchConnectionPrv.startup();
 289             starterChain.add(isOnlineFuture);
 290         }
 291
 292         Future<List<Boolean>> srvStarted = Futures.allAsList(starterChain);
 293     }
 294
 295     /**
 296      * @return wished connections configurations
 297      * @deprecated use configSubsystem
 298      */
 299     @Deprecated
 300     private static Collection<ConnectionConfiguration> getConnectionConfiguration() {
 301         // TODO:: get config from state manager
 302         ConnectionConfiguration configuration = ConnectionConfigurationFactory.getDefault();
 303         ConnectionConfiguration configurationLegacy = ConnectionConfigurationFactory.getLegacy();
 304         return Lists.newArrayList(configuration, configurationLegacy);
 305     }
 306
 307     /**
 308      * Function called by the dependency manager before the services exported by
 309      * the component are unregistered, this will be followed by a "destroy ()"
 310      * calls
 311      *
 312      */
 313     public void stop() {
 314         LOG.debug("stopping");
 315         List<ListenableFuture<Boolean>> stopChain = new ArrayList<>(switchConnectionProviders.size());
 316         try {
 317             for (SwitchConnectionProvider switchConnectionPrv : switchConnectionProviders) {
 318                 ListenableFuture<Boolean> shutdown =  switchConnectionPrv.shutdown();
 319                 stopChain.add(shutdown);
 320             }
 321             Futures.allAsList(stopChain).get(5000, TimeUnit.MILLISECONDS);
 322         } catch (InterruptedException | ExecutionException | TimeoutException e) {
 323             LOG.error(e.getMessage(), e);
 324         }
 325         close();
 326     }
 327
 328     /**
 329      * Function called by the dependency manager when at least one dependency
 330      * become unsatisfied or when the component is shutting down because for
 331      * example bundle is being stopped.
 332      *
 333      */
 334     public void destroy() {
 335         close();
 336     }
 337
 338     @Override
 339     public void addMessageTranslator(final Class<? extends DataObject> messageType, final int version, final IMDMessageTranslator<OfHeader, List<DataObject>> translator) {
 340         TranslatorKey tKey = new TranslatorKey(version, messageType.getName());
 341
 342         Collection<IMDMessageTranslator<OfHeader, List<DataObject>>> existingValues = messageTranslators.get(tKey);
 343         if (existingValues == null) {
 344             existingValues = new LinkedHashSet<>();
 345             messageTranslators.put(tKey, existingValues);
 346         }
 347         existingValues.add(translator);
 348         LOG.debug("{} is now translated by {}", messageType, translator);
 349     }
 350
 351     @Override
 352     public void removeMessageTranslator(final Class<? extends DataObject> messageType, final int version, final IMDMessageTranslator<OfHeader, List<DataObject>> translator) {
 353         TranslatorKey tKey = new TranslatorKey(version, messageType.getName());
 354         Collection<IMDMessageTranslator<OfHeader, List<DataObject>>> values = messageTranslators.get(tKey);
 355         if (values != null) {
 356             values.remove(translator);
 357             if (values.isEmpty()) {
 358                 messageTranslators.remove(tKey);
 359             }
 360             LOG.debug("{} is now removed from translators", translator);
 361          }
 362     }
 363
 364     @Override
 365     public void addMessagePopListener(final Class<? extends DataObject> messageType, final PopListener<DataObject> popListener) {
 366         Collection<PopListener<DataObject>> existingValues = popListeners.get(messageType);
 367         if (existingValues == null) {
 368             existingValues = new LinkedHashSet<>();
 369             popListeners.put(messageType, existingValues);
 370         }
 371         existingValues.add(popListener);
 372         LOG.debug("{} is now popListened by {}", messageType, popListener);
 373     }
 374
 375     @Override
 376     public void removeMessagePopListener(final Class<? extends DataObject> messageType, final PopListener<DataObject> popListener) {
 377         Collection<PopListener<DataObject>> values = popListeners.get(messageType);
 378         if (values != null) {
 379             values.remove(popListener);
 380             if (values.isEmpty()) {
 381                 popListeners.remove(messageType);
 382             }
 383             LOG.debug("{} is now removed from popListeners", popListener);
 384          }
 385     }
 386
 387     /**
 388      * @param messageSpyCounter the messageSpyCounter to set
 389      */
 390     public void setMessageSpyCounter(
 391             final MessageSpy<DataContainer> messageSpyCounter) {
 392         this.messageSpyCounter = messageSpyCounter;
 393     }
 394
 395     @Override
 396     public void close() {
 397         LOG.debug("close");
 398         messageSpyCounter = null;
 399         messageTranslators = null;
 400         popListeners = null;
 401         for (SwitchConnectionProvider switchConnectionPrv : switchConnectionProviders) {
 402             switchConnectionPrv.setSwitchConnectionHandler(null);
 403         }
 404         switchConnectionProviders = null;
 405         OFSessionUtil.releaseSessionManager();
 406         errorHandler = null;
 407     }
 408 }