opendaylight/md-sal/statistics-manager/src/main/java/org/opendaylight/controller/md/statistics/manager/impl/StatListenCommitFlow.java

   1 /**
   2  * Copyright (c) 2014 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.controller.md.statistics.manager.impl;
  10
  11 import java.util.ArrayList;
  12 import java.util.Collections;
  13 import java.util.HashMap;
  14 import java.util.Iterator;
  15 import java.util.LinkedList;
  16 import java.util.List;
  17 import java.util.Map;
  18 import java.util.Map.Entry;
  19 import java.util.concurrent.atomic.AtomicInteger;
  20
  21 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  22 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  23 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  24 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  25 import org.opendaylight.controller.md.statistics.manager.StatRpcMsgManager.TransactionCacheContainer;
  26 import org.opendaylight.controller.md.statistics.manager.StatisticsManager;
  27 import org.opendaylight.controller.md.statistics.manager.StatisticsManager.StatDataStoreOperation;
  28 import org.opendaylight.controller.md.statistics.manager.impl.helper.FlowComparator;
  29 import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowHashIdMapping;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowHashIdMappingBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowId;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.nodes.node.table.FlowHashIdMap;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.nodes.node.table.FlowHashIdMapBuilder;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.nodes.node.table.FlowHashIdMapKey;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.Table;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.TableKey;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.Flow;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowBuilder;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.FlowKey;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.AggregateFlowStatisticsData;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.AggregateFlowStatisticsDataBuilder;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.AggregateFlowStatisticsUpdate;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.FlowStatisticsData;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.FlowStatisticsDataBuilder;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.FlowsStatisticsUpdate;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.OpendaylightFlowStatisticsListener;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.aggregate.flow.statistics.AggregateFlowStatisticsBuilder;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.flow.and.statistics.map.list.FlowAndStatisticsMapList;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.flow.and.statistics.map.list.FlowAndStatisticsMapListBuilder;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.statistics.rev130819.flow.statistics.FlowStatisticsBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.transaction.rev131103.TransactionAware;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.transaction.rev131103.TransactionId;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.Nodes;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
  59 import org.opendaylight.yangtools.yang.binding.DataObject;
  60 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  61 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  62 import org.slf4j.Logger;
  63 import org.slf4j.LoggerFactory;
  64
  65 import com.google.common.base.Optional;
  66 import com.google.common.collect.BiMap;
  67 import com.google.common.collect.HashBiMap;
  68
  69 /**
  70  * statistics-manager
  71  * org.opendaylight.controller.md.statistics.manager.impl
  72  *
  73  * StatListenCommitFlow
  74  * Class is a NotifyListener for FlowStatistics and DataChangeListener for Config/DataStore for Flow node.
  75  * All expected (registered) FlowStatistics will be builded and commit to Operational/DataStore.
  76  * DataChangeEven should call create/delete Flow in Operational/DS create process needs to pair
  77  * Device Flow HashCode and FlowId from Config/DS
  78  *
  79  * @author <a href="mailto:vdemcak@cisco.com">Vaclav Demcak</a>
  80  *
  81  */
  82 public class StatListenCommitFlow extends StatAbstractListenCommit<Flow, OpendaylightFlowStatisticsListener>
  83                                             implements OpendaylightFlowStatisticsListener {
  84
  85     protected static final Logger LOG = LoggerFactory.getLogger(StatListenCommitFlow.class);
  86
  87     private static final String ALIEN_SYSTEM_FLOW_ID = "#UF$TABLE*";
  88
  89     private static final Integer REMOVE_AFTER_MISSING_COLLECTION = 1;
  90
  91     private final AtomicInteger unaccountedFlowsCounter = new AtomicInteger(0);
  92
  93     public StatListenCommitFlow (final StatisticsManager manager, final DataBroker db,
  94             final NotificationProviderService nps){
  95         super(manager, db, nps, Flow.class);
  96     }
  97
  98     @Override
  99     protected OpendaylightFlowStatisticsListener getStatNotificationListener() {
 100         return this;
 101     }
 102
 103     @Override
 104     protected InstanceIdentifier<Flow> getWildCardedRegistrationPath() {
 105         return InstanceIdentifier.create(Nodes.class).child(Node.class)
 106                 .augmentation(FlowCapableNode.class).child(Table.class).child(Flow.class);
 107     }
 108
 109     @Override
 110     public void onAggregateFlowStatisticsUpdate(final AggregateFlowStatisticsUpdate notification) {
 111         final TransactionId transId = notification.getTransactionId();
 112         final NodeId nodeId = notification.getId();
 113         if ( ! isExpectedStatistics(transId, nodeId)) {
 114             LOG.debug("STAT-MANAGER - AggregateFlowStatisticsUpdate: unregistred notification detect TransactionId {}", transId);
 115             return;
 116         }
 117         manager.getRpcMsgManager().addNotification(notification, nodeId);
 118         if (notification.isMoreReplies()) {
 119             return;
 120         }
 121         /* check flow Capable Node and write statistics */
 122         manager.enqueue(new StatDataStoreOperation() {
 123             @Override
 124             public void applyOperation(final ReadWriteTransaction tx) {
 125
 126                 final Optional<TransactionCacheContainer<?>> txContainer = getTransactionCacheContainer(transId, nodeId);
 127                 if (( ! txContainer.isPresent()) || txContainer.get().getNotifications() == null) {
 128                     return;
 129                 }
 130                 final Optional<? extends DataObject> inputObj = txContainer.get().getConfInput();
 131                 if (( ! inputObj.isPresent()) || ( ! (inputObj.get() instanceof Table))) {
 132                     return;
 133                 }
 134                 final Table table = (Table) inputObj.get();
 135                 final List<? extends TransactionAware> cacheNotifs = txContainer.get().getNotifications();
 136                 for (final TransactionAware notif : cacheNotifs) {
 137                     if (notif instanceof AggregateFlowStatisticsUpdate) {
 138                         final AggregateFlowStatisticsData stats = new AggregateFlowStatisticsDataBuilder()
 139                             .setAggregateFlowStatistics(new AggregateFlowStatisticsBuilder(notification).build()).build();
 140                         final InstanceIdentifier<FlowCapableNode> fNodeIdent = InstanceIdentifier.create(Nodes.class)
 141                                 .child(Node.class, new NodeKey(nodeId)).augmentation(FlowCapableNode.class);
 142                         final InstanceIdentifier<AggregateFlowStatisticsData> tableStatRef = fNodeIdent
 143                                 .child(Table.class, table.getKey()).augmentation(AggregateFlowStatisticsData.class);
 144                         Optional<FlowCapableNode> fNode = Optional.absent();
 145                         try {
 146                             fNode = tx.read(LogicalDatastoreType.OPERATIONAL, fNodeIdent).checkedGet();
 147                         } catch (final ReadFailedException e) {
 148                             LOG.debug("Read Operational/DS for FlowCapableNode fail! {}", fNodeIdent, e);
 149                             return;
 150                         }
 151                         if (fNode.isPresent()) {
 152                             tx.put(LogicalDatastoreType.OPERATIONAL, tableStatRef, stats, true);
 153                         }
 154                     }
 155                 }
 156             }
 157         });
 158     }
 159
 160     @Override
 161     public void onFlowsStatisticsUpdate(final FlowsStatisticsUpdate notification) {
 162         final TransactionId transId = notification.getTransactionId();
 163         final NodeId nodeId = notification.getId();
 164         if ( ! isExpectedStatistics(transId, nodeId)) {
 165             LOG.debug("STAT-MANAGER - FlowsStatisticsUpdate: unregistred notification detect TransactionId {}", transId);
 166             return;
 167         }
 168         manager.getRpcMsgManager().addNotification(notification, nodeId);
 169         if (notification.isMoreReplies()) {
 170             LOG.trace("Next notification for join txId {}", transId);
 171             return;
 172         }
 173         /* add flow's statistics */
 174         manager.enqueue(new StatDataStoreOperation() {
 175             @Override
 176             public void applyOperation(final ReadWriteTransaction tx) {
 177                 final Optional<TransactionCacheContainer<?>> txContainer = getTransactionCacheContainer(transId, nodeId);
 178                 if (( ! txContainer.isPresent()) || txContainer.get().getNotifications() == null) {
 179                     return;
 180                 }
 181                 final List<FlowAndStatisticsMapList> flowStats = new ArrayList<FlowAndStatisticsMapList>(10);
 182                 final InstanceIdentifier<Node> nodeIdent = InstanceIdentifier.create(Nodes.class)
 183                         .child(Node.class, new NodeKey(nodeId));
 184                 final List<? extends TransactionAware> cacheNotifs = txContainer.get().getNotifications();
 185                 for (final TransactionAware notif : cacheNotifs) {
 186                     if (notif instanceof FlowsStatisticsUpdate) {
 187                         final List<FlowAndStatisticsMapList> notifList =
 188                                 ((FlowsStatisticsUpdate) notif).getFlowAndStatisticsMapList();
 189                         if (notifList != null) {
 190                             flowStats.addAll(notifList);
 191                         }
 192                     }
 193                 }
 194
 195                 statsFlowCommitAll(flowStats, nodeIdent, tx);
 196                 /* cleaning all not cached hash collisions */
 197                 final Map<InstanceIdentifier<Flow>, Integer> listAliens = mapNodesForDelete.get(nodeIdent);
 198                 if (listAliens != null) {
 199                     for (final Entry<InstanceIdentifier<Flow>, Integer> nodeForDelete : listAliens.entrySet()) {
 200                         final Integer lifeIndex = nodeForDelete.getValue();
 201                         if (nodeForDelete.getValue() > 0) {
 202                             nodeForDelete.setValue(Integer.valueOf(lifeIndex.intValue() - 1));
 203                         } else {
 204                             final InstanceIdentifier<Flow> flowNodeIdent = nodeForDelete.getKey();
 205                             mapNodesForDelete.get(nodeIdent).remove(flowNodeIdent);
 206                             tx.delete(LogicalDatastoreType.OPERATIONAL, flowNodeIdent);
 207                         }
 208                     }
 209                 }
 210                 /* Notification for continue collecting statistics */
 211                 notifyToCollectNextStatistics(nodeIdent);
 212             }
 213         });
 214     }
 215
 216     private void statsFlowCommitAll(final List<FlowAndStatisticsMapList> list,
 217             final InstanceIdentifier<Node> nodeIdent, final ReadWriteTransaction tx) {
 218
 219         final InstanceIdentifier<FlowCapableNode> fNodeIdent = nodeIdent.augmentation(FlowCapableNode.class);
 220
 221         final Optional<FlowCapableNode> fNode;
 222         try {
 223             fNode = tx.read(LogicalDatastoreType.OPERATIONAL, fNodeIdent).checkedGet();
 224         }
 225         catch (final ReadFailedException e) {
 226             LOG.debug("Read FlowCapableNode {} in Operational/DS fail! Statistic scan not be updated.", nodeIdent, e);
 227             return;
 228         }
 229         if ( ! fNode.isPresent()) {
 230             LOG.trace("FlowCapableNode {} is not presented in Operational/DS. Statisticscan not be updated.", nodeIdent);
 231             return;
 232         }
 233
 234         final NodeUpdateState nodeState = new NodeUpdateState(fNodeIdent,fNode.get());
 235
 236         for (final FlowAndStatisticsMapList flowStat : list) {
 237             final TableKey tableKey = new TableKey(flowStat.getTableId());
 238             final TableFlowUpdateState tableState = nodeState.getTable(tableKey, tx);
 239             tableState.reportFlow(flowStat,tx);
 240         }
 241
 242         for (final TableFlowUpdateState table : nodeState.getTables()) {
 243             table.removeUnreportedFlows(tx);
 244         }
 245     }
 246
 247     /**
 248      * Method adds statistics to Flow
 249      *
 250      * @param flowBuilder
 251      * @param deviceFlow
 252      */
 253     private void addStatistics(final FlowBuilder flowBuilder, final FlowAndStatisticsMapList deviceFlow) {
 254         final FlowAndStatisticsMapListBuilder stats = new FlowAndStatisticsMapListBuilder(deviceFlow);
 255         final FlowStatisticsBuilder flowStatisticsBuilder = new FlowStatisticsBuilder(stats.build());
 256         final FlowStatisticsDataBuilder flowStatisticsData =new FlowStatisticsDataBuilder();
 257         flowStatisticsData.setFlowStatistics(flowStatisticsBuilder.build());
 258         flowBuilder.addAugmentation(FlowStatisticsData.class, flowStatisticsData.build());
 259     }
 260
 261     /**
 262      * build pseudoUnique hashCode for flow in table
 263      * for future easy identification
 264      *
 265      * FIXME: we expect same version for YANG models for all clusters and that has to be fix
 266      * FIXME: CREATE BETTER KEY - for flow (MATCH is the problem)
 267      */
 268     static String buildFlowIdOperKey(final FlowAndStatisticsMapList deviceFlow) {
 269         return new StringBuffer().append(deviceFlow.getMatch())
 270                 .append(deviceFlow.getPriority()).append(deviceFlow.getCookie().getValue()).toString();
 271     }
 272
 273     private class NodeUpdateState {
 274         private final InstanceIdentifier<FlowCapableNode> nodeIdentifier;
 275         private final Map<TableKey,TableFlowUpdateState> tables = new HashMap<>();
 276
 277         public NodeUpdateState(final InstanceIdentifier<FlowCapableNode> fNodeIdent, final FlowCapableNode flowCapableNode) {
 278             nodeIdentifier = fNodeIdent;
 279             final List<Table> tableList = flowCapableNode.getTable();
 280             if(tableList != null) {
 281             for (final Table table : tableList) {
 282                 final TableKey tableKey = table.getKey();
 283                     tables.put(tableKey, new TableFlowUpdateState(nodeIdentifier.child(Table.class,tableKey),table));
 284                 }
 285             }
 286         }
 287
 288         public Iterable<TableFlowUpdateState> getTables() {
 289             return tables.values();
 290         }
 291
 292         TableFlowUpdateState getTable(final TableKey key,final ReadWriteTransaction tx) {
 293             TableFlowUpdateState table = tables.get(key);
 294             if(table == null) {
 295                 table = new TableFlowUpdateState(nodeIdentifier.child(Table.class, key), null);
 296                 tables.put(key, table);
 297             }
 298             return table;
 299         }
 300     }
 301
 302     private class TableFlowUpdateState {
 303
 304         private boolean tableEnsured = false;
 305         final KeyedInstanceIdentifier<Table, TableKey> tableRef;
 306         final TableKey tableKey;
 307         final BiMap<FlowHashIdMapKey, FlowId> flowIdByHash;
 308         List<Flow> configFlows;
 309
 310         public TableFlowUpdateState(final KeyedInstanceIdentifier<Table, TableKey> tablePath, final Table table) {
 311             tableRef = tablePath;
 312             tableKey = tablePath.getKey();
 313             flowIdByHash = HashBiMap.create();
 314             if(table != null) {
 315                 final FlowHashIdMapping flowHashMapping = table.getAugmentation(FlowHashIdMapping.class);
 316                 if (flowHashMapping != null) {
 317                     final List<FlowHashIdMap>  flowHashMap = flowHashMapping.getFlowHashIdMap() != null
 318                             ? flowHashMapping.getFlowHashIdMap() : Collections.<FlowHashIdMap> emptyList();
 319                     for (final FlowHashIdMap flowHashId : flowHashMap) {
 320                         try {
 321                             flowIdByHash.put(flowHashId.getKey(), flowHashId.getFlowId());
 322                         } catch (final Exception e) {
 323                             LOG.warn("flow hashing hit a duplicate for {} -> {}", flowHashId.getKey(), flowHashId.getFlowId());
 324                         }
 325                     }
 326                 }
 327             }
 328         }
 329
 330         private void ensureTable(final ReadWriteTransaction tx) {
 331             if( ! tableEnsured) {
 332                 final FlowHashIdMapping emptyMapping = new FlowHashIdMappingBuilder()
 333                     .setFlowHashIdMap(Collections.<FlowHashIdMap> emptyList()).build();
 334                 tx.merge(LogicalDatastoreType.OPERATIONAL, tableRef.augmentation(FlowHashIdMapping.class), emptyMapping, true);
 335                 tableEnsured = true;
 336             }
 337         }
 338
 339         private FlowKey searchInConfiguration(final FlowAndStatisticsMapList flowStat, final ReadWriteTransaction trans) {
 340             initConfigFlows(trans);
 341             final Iterator<Flow> it = configFlows.iterator();
 342             while(it.hasNext()) {
 343                 final Flow cfgFlow = it.next();
 344                 final FlowKey cfgKey = cfgFlow.getKey();
 345                 if(flowIdByHash.inverse().containsKey(cfgKey)) {
 346                     it.remove();
 347                 } else if(FlowComparator.flowEquals(flowStat, cfgFlow)) {
 348                     it.remove();
 349                     return cfgKey;
 350                 }
 351             }
 352             return null;
 353         }
 354
 355         private void initConfigFlows(final ReadWriteTransaction trans) {
 356             final Optional<Table> table = readLatestConfiguration(tableRef);
 357             List<Flow> localList = null;
 358             if(table.isPresent()) {
 359                 localList = table.get().getFlow();
 360             }
 361             if(localList == null) {
 362                 configFlows = Collections.emptyList();
 363             } else {
 364                 configFlows = new LinkedList<>(localList);
 365             }
 366         }
 367
 368         private FlowKey getFlowKeyAndRemoveHash(final FlowHashIdMapKey key) {
 369             final FlowId ret = flowIdByHash.get(key);
 370             if(ret != null) {
 371                 flowIdByHash.remove(key);
 372                 return new FlowKey(ret);
 373             }
 374             return null;
 375         }
 376
 377         /* Returns FlowKey which doesn't exist in any DataStore for now */
 378         private FlowKey makeAlienFlowKey() {
 379             final StringBuilder sBuilder = new StringBuilder(ALIEN_SYSTEM_FLOW_ID)
 380                 .append(tableKey.getId()).append("-").append(unaccountedFlowsCounter.incrementAndGet());
 381             final FlowId flowId = new FlowId(sBuilder.toString());
 382             return new FlowKey(flowId);
 383         }
 384
 385         private Map<FlowHashIdMapKey, FlowId> getRemovalList() {
 386             return flowIdByHash;
 387         }
 388
 389         void reportFlow(final FlowAndStatisticsMapList flowStat, final ReadWriteTransaction trans) {
 390             ensureTable(trans);
 391             final FlowHashIdMapKey hashingKey = new FlowHashIdMapKey(buildFlowIdOperKey(flowStat));
 392             FlowKey flowKey = getFlowKeyAndRemoveHash(hashingKey);
 393             if (flowKey == null) {
 394                 flowKey = searchInConfiguration(flowStat, trans);
 395                 if ( flowKey == null) {
 396                     flowKey = makeAlienFlowKey();
 397                 }
 398                 updateHashCache(trans,flowKey,hashingKey);
 399             }
 400             final FlowBuilder flowBuilder = new FlowBuilder(flowStat);
 401             flowBuilder.setKey(flowKey);
 402             addStatistics(flowBuilder, flowStat);
 403             final InstanceIdentifier<Flow> flowIdent = tableRef.child(Flow.class, flowKey);
 404             trans.put(LogicalDatastoreType.OPERATIONAL, flowIdent, flowBuilder.build());
 405             /* check life for Alien flows */
 406             if (flowKey.getId().getValue().startsWith(ALIEN_SYSTEM_FLOW_ID)) {
 407                 removeData(flowIdent, REMOVE_AFTER_MISSING_COLLECTION);
 408             }
 409         }
 410
 411         /* Build and deploy new FlowHashId map */
 412         private void updateHashCache(final ReadWriteTransaction trans, final FlowKey flowKey, final FlowHashIdMapKey hashingKey) {
 413             final FlowHashIdMapBuilder flHashIdMap = new FlowHashIdMapBuilder();
 414             flHashIdMap.setFlowId(flowKey.getId());
 415             flHashIdMap.setKey(hashingKey);
 416             final KeyedInstanceIdentifier<FlowHashIdMap, FlowHashIdMapKey> flHashIdent = tableRef
 417                     .augmentation(FlowHashIdMapping.class).child(FlowHashIdMap.class, hashingKey);
 418             /* Add new FlowHashIdMap */
 419             trans.put(LogicalDatastoreType.OPERATIONAL, flHashIdent, flHashIdMap.build());
 420         }
 421
 422         void removeUnreportedFlows(final ReadWriteTransaction tx) {
 423             final InstanceIdentifier<Node> nodeIdent = tableRef.firstIdentifierOf(Node.class);
 424             final Map<InstanceIdentifier<Flow>, Integer> nodeDeleteMap = mapNodesForDelete.get(nodeIdent);
 425             final Map<FlowHashIdMapKey, FlowId> listForRemove = getRemovalList();
 426             for (final Entry<FlowHashIdMapKey, FlowId> entryForRemove : listForRemove.entrySet()) {
 427                 final FlowKey flowKey = new FlowKey(entryForRemove.getValue());
 428                 final InstanceIdentifier<Flow> flowRef = tableRef.child(Flow.class, flowKey);
 429                 if (nodeDeleteMap != null && flowKey.getId().getValue().startsWith(ALIEN_SYSTEM_FLOW_ID)) {
 430                     final Integer lifeIndex = nodeDeleteMap.get(flowRef);
 431                     if (lifeIndex > 0) {
 432                         break;
 433                     } else {
 434                         nodeDeleteMap.remove(flowRef);
 435                     }
 436                 }
 437                 final InstanceIdentifier<FlowHashIdMap> flHashIdent =
 438                         tableRef.augmentation(FlowHashIdMapping.class).child(FlowHashIdMap.class, entryForRemove.getKey());
 439                 tx.delete(LogicalDatastoreType.OPERATIONAL, flowRef);
 440                 tx.delete(LogicalDatastoreType.OPERATIONAL, flHashIdent);
 441             }
 442         }
 443     }
 444 }
 445