openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/lifecycle/ContextChainHolderImpl.java

   1 /*
   2  * Copyright (c) 2016 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 package org.opendaylight.openflowplugin.impl.lifecycle;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import com.google.common.util.concurrent.FutureCallback;
  12 import com.google.common.util.concurrent.Futures;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import com.google.common.util.concurrent.MoreExecutors;
  15 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  16 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  17 import java.util.HashMap;
  18 import java.util.List;
  19 import java.util.Map;
  20 import java.util.Objects;
  21 import java.util.Optional;
  22 import java.util.concurrent.ConcurrentHashMap;
  23 import java.util.concurrent.ExecutionException;
  24 import java.util.concurrent.ExecutorService;
  25 import java.util.concurrent.Executors;
  26 import java.util.concurrent.ScheduledExecutorService;
  27 import java.util.concurrent.ThreadFactory;
  28 import java.util.concurrent.TimeUnit;
  29 import java.util.concurrent.TimeoutException;
  30 import java.util.stream.Collectors;
  31 import org.eclipse.jdt.annotation.NonNull;
  32 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipChange;
  33 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipListenerRegistration;
  34 import org.opendaylight.mdsal.eos.binding.api.EntityOwnershipService;
  35 import org.opendaylight.mdsal.eos.common.api.EntityOwnershipState;
  36 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceProvider;
  37 import org.opendaylight.openflowplugin.api.openflow.OFPManager;
  38 import org.opendaylight.openflowplugin.api.openflow.connection.ConnectionContext;
  39 import org.opendaylight.openflowplugin.api.openflow.connection.ConnectionStatus;
  40 import org.opendaylight.openflowplugin.api.openflow.device.DeviceContext;
  41 import org.opendaylight.openflowplugin.api.openflow.device.DeviceInfo;
  42 import org.opendaylight.openflowplugin.api.openflow.device.DeviceManager;
  43 import org.opendaylight.openflowplugin.api.openflow.lifecycle.ContextChain;
  44 import org.opendaylight.openflowplugin.api.openflow.lifecycle.ContextChainHolder;
  45 import org.opendaylight.openflowplugin.api.openflow.lifecycle.ContextChainMastershipState;
  46 import org.opendaylight.openflowplugin.api.openflow.lifecycle.MasterChecker;
  47 import org.opendaylight.openflowplugin.api.openflow.lifecycle.OwnershipChangeListener;
  48 import org.opendaylight.openflowplugin.api.openflow.role.RoleContext;
  49 import org.opendaylight.openflowplugin.api.openflow.role.RoleManager;
  50 import org.opendaylight.openflowplugin.api.openflow.rpc.RpcContext;
  51 import org.opendaylight.openflowplugin.api.openflow.rpc.RpcManager;
  52 import org.opendaylight.openflowplugin.api.openflow.statistics.StatisticsContext;
  53 import org.opendaylight.openflowplugin.api.openflow.statistics.StatisticsManager;
  54 import org.opendaylight.openflowplugin.impl.util.DeviceStateUtil;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FeaturesReply;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.mdsal.core.general.entity.rev150930.Entity;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.openflow.provider.config.rev160510.OpenflowProviderConfig;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.openflowplugin.rf.state.rev170713.ResultState;
  62 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  63 import org.opendaylight.yangtools.yang.common.Uint8;
  64 import org.slf4j.Logger;
  65 import org.slf4j.LoggerFactory;
  66
  67 public class ContextChainHolderImpl implements ContextChainHolder, MasterChecker {
  68     private static final Logger LOG = LoggerFactory.getLogger(ContextChainHolderImpl.class);
  69     private static final Logger OF_EVENT_LOG = LoggerFactory.getLogger("OfEventLog");
  70
  71     private static final String CONTEXT_CREATED_FOR_CONNECTION = " context created for connection: {}";
  72     private static final long REMOVE_DEVICE_FROM_DS_TIMEOUT = 5000L;
  73     private static final String ASYNC_SERVICE_ENTITY_TYPE = "org.opendaylight.mdsal.AsyncServiceCloseEntityType";
  74     private static final String SERVICE_ENTITY_TYPE = "org.opendaylight.mdsal.ServiceEntityType";
  75     private static final String SEPARATOR = ":";
  76     private final Map<DeviceInfo, ContextChain> contextChainMap = new ConcurrentHashMap<>();
  77     private final Map<DeviceInfo, ? super ConnectionContext> connectingDevices = new ConcurrentHashMap<>();
  78     private final EntityOwnershipListenerRegistration eosListenerRegistration;
  79     private final ClusterSingletonServiceProvider singletonServiceProvider;
  80     private final ExecutorService executorService;
  81     private final OwnershipChangeListener ownershipChangeListener;
  82     private final ThreadFactory threadFactory = new ThreadFactoryBuilder().setDaemon(true)
  83             .setNameFormat("node-cleaner-%d").setUncaughtExceptionHandler((thread, throwable) -> {
  84                 LOG.warn("Uncaught exception while removing node data from operational datastore.", throwable);
  85             }).build();
  86     private final ScheduledExecutorService nodeCleanerExecutor = Executors.newScheduledThreadPool(
  87             Runtime.getRuntime().availableProcessors() , threadFactory);
  88     private final EntityOwnershipService entityOwnershipService;
  89     private final OpenflowProviderConfig config;
  90     private DeviceManager deviceManager;
  91     private RpcManager rpcManager;
  92     private StatisticsManager statisticsManager;
  93     private RoleManager roleManager;
  94
  95     public ContextChainHolderImpl(final ExecutorService executorService,
  96                                   final ClusterSingletonServiceProvider singletonServiceProvider,
  97                                   final EntityOwnershipService entityOwnershipService,
  98                                   final OwnershipChangeListener ownershipChangeListener,
  99                                   final OpenflowProviderConfig config) {
 100         this.singletonServiceProvider = singletonServiceProvider;
 101         this.executorService = executorService;
 102         this.ownershipChangeListener = ownershipChangeListener;
 103         this.ownershipChangeListener.setMasterChecker(this);
 104         this.entityOwnershipService = entityOwnershipService;
 105         this.config = config;
 106         this.eosListenerRegistration = Objects
 107                 .requireNonNull(entityOwnershipService.registerListener(ASYNC_SERVICE_ENTITY_TYPE, this));
 108     }
 109
 110     @Override
 111     public <T extends OFPManager> void addManager(final T manager) {
 112         if (deviceManager == null && manager instanceof DeviceManager) {
 113             LOG.trace("Context chain holder: Device manager OK.");
 114             deviceManager = (DeviceManager) manager;
 115         } else if (rpcManager == null && manager instanceof RpcManager) {
 116             LOG.trace("Context chain holder: RPC manager OK.");
 117             rpcManager = (RpcManager) manager;
 118         } else if (statisticsManager == null && manager instanceof StatisticsManager) {
 119             LOG.trace("Context chain holder: Statistics manager OK.");
 120             statisticsManager = (StatisticsManager) manager;
 121         } else if (roleManager == null && manager instanceof RoleManager) {
 122             LOG.trace("Context chain holder: Role manager OK.");
 123             roleManager = (RoleManager) manager;
 124         }
 125     }
 126
 127     @VisibleForTesting
 128     void createContextChain(final ConnectionContext connectionContext) {
 129         final DeviceInfo deviceInfo = connectionContext.getDeviceInfo();
 130         final DeviceContext deviceContext = deviceManager.createContext(connectionContext);
 131         deviceContext.registerMastershipWatcher(this);
 132         LOG.debug("Device" + CONTEXT_CREATED_FOR_CONNECTION, deviceInfo);
 133
 134         final RpcContext rpcContext = rpcManager.createContext(deviceContext);
 135         rpcContext.registerMastershipWatcher(this);
 136         LOG.debug("RPC" + CONTEXT_CREATED_FOR_CONNECTION, deviceInfo);
 137
 138         final StatisticsContext statisticsContext = statisticsManager
 139                 .createContext(deviceContext, ownershipChangeListener.isReconciliationFrameworkRegistered());
 140         statisticsContext.registerMastershipWatcher(this);
 141         LOG.debug("Statistics" + CONTEXT_CREATED_FOR_CONNECTION, deviceInfo);
 142
 143         final RoleContext roleContext = roleManager.createContext(deviceContext);
 144         roleContext.registerMastershipWatcher(this);
 145         LOG.debug("Role" + CONTEXT_CREATED_FOR_CONNECTION, deviceInfo);
 146
 147         final ContextChain contextChain = new ContextChainImpl(this, connectionContext, executorService);
 148         contextChain.registerDeviceRemovedHandler(deviceManager);
 149         contextChain.registerDeviceRemovedHandler(rpcManager);
 150         contextChain.registerDeviceRemovedHandler(statisticsManager);
 151         contextChain.registerDeviceRemovedHandler(roleManager);
 152         contextChain.registerDeviceRemovedHandler(this);
 153         contextChain.addContext(deviceContext);
 154         contextChain.addContext(rpcContext);
 155         contextChain.addContext(statisticsContext);
 156         contextChain.addContext(roleContext);
 157         contextChainMap.put(deviceInfo, contextChain);
 158         connectingDevices.remove(deviceInfo);
 159         LOG.debug("Context chain" + CONTEXT_CREATED_FOR_CONNECTION, deviceInfo);
 160
 161         deviceContext.onPublished();
 162         contextChain.registerServices(singletonServiceProvider);
 163     }
 164
 165     @Override
 166     public ConnectionStatus deviceConnected(final ConnectionContext connectionContext) {
 167         final DeviceInfo deviceInfo = connectionContext.getDeviceInfo();
 168         final ContextChain contextChain = contextChainMap.get(deviceInfo);
 169         final FeaturesReply featuresReply = connectionContext.getFeatures();
 170         final Uint8 auxiliaryId = featuresReply != null ? featuresReply.getAuxiliaryId() : null;
 171
 172         if (auxiliaryId != null && auxiliaryId.toJava() != 0) {
 173             if (contextChain == null) {
 174                 LOG.warn("An auxiliary connection for device {}, but no primary connection. Refusing connection.",
 175                          deviceInfo);
 176                 return ConnectionStatus.REFUSING_AUXILIARY_CONNECTION;
 177             } else {
 178                 if (contextChain.addAuxiliaryConnection(connectionContext)) {
 179                     LOG.info("An auxiliary connection was added to device: {}", deviceInfo);
 180                     return ConnectionStatus.MAY_CONTINUE;
 181                 } else {
 182                     LOG.warn("Not able to add auxiliary connection to the device {}", deviceInfo);
 183                     return ConnectionStatus.REFUSING_AUXILIARY_CONNECTION;
 184                 }
 185             }
 186         } else {
 187             LOG.info("Device {} connected.", deviceInfo);
 188             final boolean contextExists = contextChain != null;
 189             final boolean isClosing = contextExists && contextChain.isClosing();
 190
 191             if (!isClosing && connectingDevices.putIfAbsent(deviceInfo, connectionContext) != null) {
 192                 LOG.warn("Device {} is already trying to connect, wait until succeeded or disconnected.", deviceInfo);
 193                 return ConnectionStatus.ALREADY_CONNECTED;
 194             }
 195
 196             if (contextExists) {
 197                 if (isClosing) {
 198                     LOG.warn("Device {} is already in termination state, closing all incoming connections.",
 199                              deviceInfo);
 200                     return ConnectionStatus.CLOSING;
 201                 }
 202
 203                 LOG.warn("Device {} already connected. Closing previous connection", deviceInfo);
 204                 destroyContextChain(deviceInfo);
 205                 LOG.info("Old connection dropped, creating new context chain for device {}", deviceInfo);
 206                 createContextChain(connectionContext);
 207             } else {
 208                 LOG.info("No context chain found for device: {}, creating new.", deviceInfo);
 209                 createContextChain(connectionContext);
 210             }
 211
 212             return ConnectionStatus.MAY_CONTINUE;
 213         }
 214
 215     }
 216
 217     @Override
 218     public void onNotAbleToStartMastership(@NonNull final DeviceInfo deviceInfo, @NonNull final String reason,
 219                                            final boolean mandatory) {
 220         LOG.error("Not able to set MASTER role on device {}, reason: {}", deviceInfo, reason);
 221
 222         if (!mandatory) {
 223             return;
 224         }
 225
 226         Optional.ofNullable(contextChainMap.get(deviceInfo)).ifPresent(contextChain -> {
 227             LOG.warn("This mastering is mandatory, destroying context chain and closing connection for device {}.",
 228                      deviceInfo);
 229             destroyContextChain(deviceInfo);
 230         });
 231     }
 232
 233     @Override
 234     public void onMasterRoleAcquired(final DeviceInfo deviceInfo, final ContextChainMastershipState mastershipState) {
 235         Optional.ofNullable(contextChainMap.get(deviceInfo)).ifPresent(contextChain -> {
 236             if (!ContextChainMastershipState.INITIAL_SUBMIT.equals(mastershipState)) {
 237                 if (contextChain.isMastered(mastershipState, true)) {
 238                     Futures.addCallback(ownershipChangeListener.becomeMasterBeforeSubmittedDS(deviceInfo),
 239                                         reconciliationFrameworkCallback(deviceInfo, contextChain, mastershipState),
 240                                         MoreExecutors.directExecutor());
 241                 }
 242             } else if (contextChain.isMastered(mastershipState, false)) {
 243                 LOG.info("Role MASTER was granted to device {}", deviceInfo);
 244                 deviceManager.sendNodeAddedNotification(deviceInfo.getNodeInstanceIdentifier());
 245             }
 246         });
 247     }
 248
 249     @Override
 250     public void onSlaveRoleAcquired(final DeviceInfo deviceInfo) {
 251         ownershipChangeListener.becomeSlaveOrDisconnect(deviceInfo);
 252         LOG.info("Role SLAVE was granted to device {}", deviceInfo);
 253         Optional.ofNullable(contextChainMap.get(deviceInfo)).ifPresent(ContextChain::makeContextChainStateSlave);
 254     }
 255
 256     @Override
 257     public void onSlaveRoleNotAcquired(final DeviceInfo deviceInfo, final String reason) {
 258         LOG.error("Not able to set SLAVE role on device {}, reason: {}", deviceInfo, reason);
 259         Optional.ofNullable(contextChainMap.get(deviceInfo)).ifPresent(contextChain -> destroyContextChain(deviceInfo));
 260     }
 261
 262     @Override
 263     public void onDeviceDisconnected(final ConnectionContext connectionContext) {
 264         final DeviceInfo deviceInfo = connectionContext.getDeviceInfo();
 265
 266         Optional.ofNullable(connectionContext.getDeviceInfo()).map(contextChainMap::get).ifPresent(contextChain -> {
 267             if (contextChain.auxiliaryConnectionDropped(connectionContext)) {
 268                 LOG.info("Auxiliary connection from device {} disconnected.", deviceInfo);
 269             } else {
 270                 LOG.info("Device {} disconnected.", deviceInfo);
 271                 destroyContextChain(deviceInfo);
 272             }
 273         });
 274     }
 275
 276     @VisibleForTesting
 277     boolean checkAllManagers() {
 278         return deviceManager != null && rpcManager != null && statisticsManager != null && roleManager != null;
 279     }
 280
 281     @Override
 282     public ContextChain getContextChain(final DeviceInfo deviceInfo) {
 283         return contextChainMap.get(deviceInfo);
 284     }
 285
 286     @Override
 287     public void close() {
 288         Map<DeviceInfo, ContextChain> copyOfChains = new HashMap<>(contextChainMap);
 289         copyOfChains.keySet().forEach(this::destroyContextChain);
 290         copyOfChains.clear();
 291         contextChainMap.clear();
 292         OF_EVENT_LOG.debug("EOS registration closed for all devices");
 293         eosListenerRegistration.close();
 294         OF_EVENT_LOG.debug("EOS registration closed for all devices");
 295         nodeCleanerExecutor.shutdownNow();
 296     }
 297
 298     @Override
 299     @SuppressFBWarnings("BC_UNCONFIRMED_CAST_OF_RETURN_VALUE")
 300     public void ownershipChanged(final EntityOwnershipChange entityOwnershipChange) {
 301         LOG.info("Entity ownership change received for node : {}", entityOwnershipChange);
 302         if (entityOwnershipChange.inJeopardy()) {
 303             LOG.warn("Controller is in Jeopardy, ignore ownership change notification. {}", entityOwnershipChange);
 304             return;
 305         }
 306         if (entityOwnershipChange.getState().hasOwner()) {
 307             return;
 308         }
 309
 310         // Findbugs flags a false violation for "Unchecked/unconfirmed cast" from GenericEntity to Entity hence the
 311         // suppression above. The suppression is temporary until EntityOwnershipChange is modified to eliminate the
 312         // violation.
 313         final String entityName = entityOwnershipChange
 314                 .getEntity()
 315                 .getIdentifier()
 316                 .firstKeyOf(Entity.class)
 317                 .getName();
 318
 319         if (entityName != null && entityName.startsWith("openflow:")) {
 320             if (nodeCleanerExecutor.isShutdown()) {
 321                 LOG.warn("Node cleaner executor thread-pool is down.");
 322                 return;
 323             }
 324             LOG.debug("Device {} will be removed from datastore in {} msec, if it's not transient notification.",
 325                     entityName, config.getDeviceDatastoreRemovalDelay().getValue());
 326             final String dpnId = getDpnIdFromNodeName(entityName);
 327             nodeCleanerExecutor.schedule(() -> {
 328                 try {
 329                     Optional<EntityOwnershipState> ownershipState = getCurrentOwnershipStatus(entityName);
 330                     if (!ownershipState.isPresent()
 331                             || Objects.equals(ownershipState.get(), EntityOwnershipState.NO_OWNER)) {
 332                         LOG.debug("Entity {} has no owner", entityName);
 333                         final KeyedInstanceIdentifier<Node, NodeKey> nodeInstanceIdentifier =
 334                                 DeviceStateUtil.createNodeInstanceIdentifier(new NodeId(entityName));
 335                         deviceManager.sendNodeRemovedNotification(nodeInstanceIdentifier);
 336                         LOG.info("Try to remove device {} from operational DS", entityName);
 337                         ListenableFuture<?> future =
 338                                 deviceManager.removeDeviceFromOperationalDS(nodeInstanceIdentifier);
 339                         Futures.addCallback(future, new FutureCallback<Object>() {
 340                             @Override
 341                             public void onSuccess(final Object result) {
 342                                 LOG.debug("Node removed from Oper DS, Node: {}", dpnId);
 343                                 OF_EVENT_LOG.debug("Node removed from Oper DS, Node: {}", dpnId);
 344                             }
 345
 346                             @Override
 347                             public void onFailure(final Throwable throwable) {
 348                                 LOG.error("Could not remove device {} from operational DS", dpnId, throwable);
 349                             }
 350                         }, MoreExecutors.directExecutor());
 351                         future.get(REMOVE_DEVICE_FROM_DS_TIMEOUT, TimeUnit.MILLISECONDS);
 352                     } else {
 353                         LOG.warn("Seems like device is still owned by other controller instance. Skip deleting {} "
 354                                 + "node from operational datastore.", entityName);
 355                     }
 356                 } catch (TimeoutException | ExecutionException | NullPointerException | InterruptedException e) {
 357                     LOG.warn("Not able to remove device {} from operational DS. ", entityName, e);
 358                 }
 359             }, config.getDeviceDatastoreRemovalDelay().getValue().toJava(), TimeUnit.MILLISECONDS);
 360         }
 361     }
 362
 363     private void destroyContextChain(final DeviceInfo deviceInfo) {
 364         OF_EVENT_LOG.debug("Destroying context chain for device {}", deviceInfo.getDatapathId());
 365         ownershipChangeListener.becomeSlaveOrDisconnect(deviceInfo);
 366         Optional.ofNullable(contextChainMap.get(deviceInfo)).ifPresent(contextChain -> {
 367             deviceManager.sendNodeRemovedNotification(deviceInfo.getNodeInstanceIdentifier());
 368             contextChain.close();
 369             connectingDevices.remove(deviceInfo);
 370         });
 371     }
 372
 373     @Override
 374     public List<DeviceInfo> listOfMasteredDevices() {
 375         return contextChainMap.entrySet().stream()
 376                 .filter(deviceInfoContextChainEntry -> deviceInfoContextChainEntry.getValue()
 377                         .isMastered(ContextChainMastershipState.CHECK, false)).map(Map.Entry::getKey)
 378                 .collect(Collectors.toList());
 379     }
 380
 381     @Override
 382     public boolean isAnyDeviceMastered() {
 383         return contextChainMap.entrySet().stream().findAny()
 384                 .filter(deviceInfoContextChainEntry -> deviceInfoContextChainEntry.getValue()
 385                         .isMastered(ContextChainMastershipState.CHECK, false)).isPresent();
 386     }
 387
 388     @Override
 389     public void onDeviceRemoved(final DeviceInfo deviceInfo) {
 390         contextChainMap.remove(deviceInfo);
 391         LOG.debug("Context chain removed for node {}", deviceInfo);
 392     }
 393
 394     private FutureCallback<ResultState> reconciliationFrameworkCallback(@NonNull final DeviceInfo deviceInfo,
 395             final ContextChain contextChain, final ContextChainMastershipState mastershipState) {
 396         return new FutureCallback<>() {
 397             @Override
 398             public void onSuccess(final ResultState result) {
 399                 if (ResultState.DONOTHING == result) {
 400                     OF_EVENT_LOG.debug("Device {} connection is enabled by reconciliation framework", deviceInfo);
 401                     LOG.info("Device {} connection is enabled by reconciliation framework.", deviceInfo);
 402                     if (mastershipState == ContextChainMastershipState.MASTER_ON_DEVICE) {
 403                         ownershipChangeListener.becomeMaster(deviceInfo);
 404                         contextChain.initializeDevice();
 405                     }
 406                     contextChain.continueInitializationAfterReconciliation();
 407                 } else {
 408                     OF_EVENT_LOG.debug("Reconciliation framework failure for device {}", deviceInfo);
 409                     LOG.warn("Reconciliation framework failure for device {} with resultState {}", deviceInfo, result);
 410                     destroyContextChain(deviceInfo);
 411                 }
 412             }
 413
 414             @Override
 415             public void onFailure(final Throwable throwable) {
 416                 OF_EVENT_LOG.debug("Reconciliation framework failure for device {} with error {}", deviceInfo,
 417                         throwable.getMessage());
 418                 LOG.warn("Reconciliation framework failure for device {}", deviceInfo, throwable);
 419                 destroyContextChain(deviceInfo);
 420             }
 421         };
 422     }
 423
 424     private String getDpnIdFromNodeName(final String nodeName) {
 425         return nodeName.substring(nodeName.lastIndexOf(SEPARATOR) + 1);
 426     }
 427
 428     private Optional<EntityOwnershipState> getCurrentOwnershipStatus(final String nodeId) {
 429         org.opendaylight.mdsal.eos.binding.api.Entity entity = createNodeEntity(nodeId);
 430         Optional<EntityOwnershipState> ownershipStatus
 431                 = entityOwnershipService.getOwnershipState(entity);
 432
 433         if (ownershipStatus.isPresent()) {
 434             LOG.debug("Current ownership status for node {} is {}", nodeId, ownershipStatus.get());
 435             return Optional.of(ownershipStatus.get());
 436         } else {
 437             LOG.trace("Ownership status is not available for node {}", nodeId);
 438         }
 439         return Optional.empty();
 440     }
 441
 442     private org.opendaylight.mdsal.eos.binding.api.Entity createNodeEntity(final String nodeId) {
 443         return new org.opendaylight.mdsal.eos.binding.api.Entity(ASYNC_SERVICE_ENTITY_TYPE, nodeId);
 444     }
 445 }