opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.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.cluster.datastore;
  10
  11 import akka.actor.ActorRef;
  12 import akka.actor.ActorSelection;
  13 import akka.actor.PoisonPill;
  14 import akka.actor.Props;
  15 import akka.event.Logging;
  16 import akka.event.LoggingAdapter;
  17 import akka.japi.Creator;
  18 import akka.persistence.RecoveryFailure;
  19 import akka.serialization.Serialization;
  20 import com.google.common.annotations.VisibleForTesting;
  21 import com.google.common.base.Optional;
  22 import com.google.common.base.Preconditions;
  23 import com.google.common.util.concurrent.CheckedFuture;
  24 import com.google.common.util.concurrent.FutureCallback;
  25 import com.google.common.util.concurrent.Futures;
  26 import com.google.common.util.concurrent.ListenableFuture;
  27 import com.google.protobuf.ByteString;
  28 import com.google.protobuf.InvalidProtocolBufferException;
  29 import org.opendaylight.controller.cluster.common.actor.CommonConfig;
  30 import org.opendaylight.controller.cluster.common.actor.MeteringBehavior;
  31 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
  32 import org.opendaylight.controller.cluster.datastore.identifiers.ShardTransactionIdentifier;
  33 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardMBeanFactory;
  34 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
  35 import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionChain;
  36 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
  37 import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
  38 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionChainReply;
  39 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply;
  40 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
  41 import org.opendaylight.controller.cluster.datastore.messages.ForwardedCommitTransaction;
  42 import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
  43 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
  44 import org.opendaylight.controller.cluster.datastore.messages.ReadDataReply;
  45 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
  46 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
  47 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
  48 import org.opendaylight.controller.cluster.datastore.modification.Modification;
  49 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
  50 import org.opendaylight.controller.cluster.datastore.node.NormalizedNodeToNodeCodec;
  51 import org.opendaylight.controller.cluster.raft.ConfigParams;
  52 import org.opendaylight.controller.cluster.raft.DefaultConfigParamsImpl;
  53 import org.opendaylight.controller.cluster.raft.RaftActor;
  54 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
  55 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  56 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  57 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  58 import org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore;
  59 import org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStoreFactory;
  60 import org.opendaylight.controller.protobuff.messages.common.NormalizedNodeMessages;
  61 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
  62 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  63 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
  64 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionFactory;
  65 import org.opendaylight.controller.sal.core.spi.data.DOMStoreWriteTransaction;
  66 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  67 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  68 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  69 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  70 import scala.concurrent.duration.FiniteDuration;
  71
  72 import java.util.ArrayList;
  73 import java.util.HashMap;
  74 import java.util.List;
  75 import java.util.Map;
  76 import java.util.concurrent.ExecutionException;
  77 import java.util.concurrent.TimeUnit;
  78
  79 /**
  80  * A Shard represents a portion of the logical data tree <br/>
  81  * <p>
  82  * Our Shard uses InMemoryDataStore as it's internal representation and delegates all requests it
  83  * </p>
  84  */
  85 public class Shard extends RaftActor {
  86
  87     private static final ConfigParams configParams = new ShardConfigParams();
  88
  89     public static final String DEFAULT_NAME = "default";
  90
  91     // The state of this Shard
  92     private final InMemoryDOMDataStore store;
  93
  94     private final Map<Object, DOMStoreThreePhaseCommitCohort>
  95         modificationToCohort = new HashMap<>();
  96
  97     private final LoggingAdapter LOG =
  98         Logging.getLogger(getContext().system(), this);
  99
 100     // By default persistent will be true and can be turned off using the system
 101     // property shard.persistent
 102     private final boolean persistent;
 103
 104     /// The name of this shard
 105     private final ShardIdentifier name;
 106
 107     private final ShardStats shardMBean;
 108
 109     private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
 110
 111     private final DatastoreContext datastoreContext;
 112
 113     private SchemaContext schemaContext;
 114
 115     private ActorRef createSnapshotTransaction;
 116
 117     private final Map<String, DOMStoreTransactionChain> transactionChains = new HashMap<>();
 118
 119     private Shard(ShardIdentifier name, Map<ShardIdentifier, String> peerAddresses,
 120             DatastoreContext datastoreContext, SchemaContext schemaContext) {
 121         super(name.toString(), mapPeerAddresses(peerAddresses), Optional.of(configParams));
 122
 123         this.name = name;
 124         this.datastoreContext = datastoreContext;
 125         this.schemaContext = schemaContext;
 126
 127         String setting = System.getProperty("shard.persistent");
 128
 129         this.persistent = !"false".equals(setting);
 130
 131         LOG.info("Shard created : {} persistent : {}", name, persistent);
 132
 133         store = InMemoryDOMDataStoreFactory.create(name.toString(), null,
 134                 datastoreContext.getDataStoreProperties());
 135
 136         if(schemaContext != null) {
 137             store.onGlobalContextUpdated(schemaContext);
 138         }
 139
 140         shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString(),
 141                 datastoreContext.getDataStoreMXBeanType());
 142         shardMBean.setDataStoreExecutor(store.getDomStoreExecutor());
 143         shardMBean.setNotificationManager(store.getDataChangeListenerNotificationManager());
 144
 145         if (isMetricsCaptureEnabled()) {
 146             getContext().become(new MeteringBehavior(this));
 147         }
 148     }
 149
 150     private static Map<String, String> mapPeerAddresses(
 151         Map<ShardIdentifier, String> peerAddresses) {
 152         Map<String, String> map = new HashMap<>();
 153
 154         for (Map.Entry<ShardIdentifier, String> entry : peerAddresses
 155             .entrySet()) {
 156             map.put(entry.getKey().toString(), entry.getValue());
 157         }
 158
 159         return map;
 160     }
 161
 162     public static Props props(final ShardIdentifier name,
 163         final Map<ShardIdentifier, String> peerAddresses,
 164         DatastoreContext datastoreContext, SchemaContext schemaContext) {
 165         Preconditions.checkNotNull(name, "name should not be null");
 166         Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");
 167         Preconditions.checkNotNull(datastoreContext, "dataStoreContext should not be null");
 168         Preconditions.checkNotNull(schemaContext, "schemaContext should not be null");
 169
 170         return Props.create(new ShardCreator(name, peerAddresses, datastoreContext, schemaContext));
 171     }
 172
 173     @Override public void onReceiveRecover(Object message) {
 174         LOG.debug("onReceiveRecover: Received message {} from {}", message.getClass().toString(),
 175             getSender());
 176
 177         if (message instanceof RecoveryFailure){
 178             LOG.error(((RecoveryFailure) message).cause(), "Recovery failed because of this cause");
 179         } else {
 180             super.onReceiveRecover(message);
 181         }
 182     }
 183
 184     @Override public void onReceiveCommand(Object message) {
 185         LOG.debug("onReceiveCommand: Received message {} from {}", message.getClass().toString(),
 186             getSender());
 187
 188         if(message.getClass().equals(ReadDataReply.SERIALIZABLE_CLASS)) {
 189             // This must be for install snapshot. Don't want to open this up and trigger
 190             // deSerialization
 191             self()
 192                 .tell(new CaptureSnapshotReply(ReadDataReply.getNormalizedNodeByteString(message)),
 193                     self());
 194
 195             // Send a PoisonPill instead of sending close transaction because we do not really need
 196             // a response
 197             getSender().tell(PoisonPill.getInstance(), self());
 198
 199         } else if (message.getClass().equals(CloseTransactionChain.SERIALIZABLE_CLASS)){
 200             closeTransactionChain(CloseTransactionChain.fromSerializable(message));
 201         } else if (message instanceof RegisterChangeListener) {
 202             registerChangeListener((RegisterChangeListener) message);
 203         } else if (message instanceof UpdateSchemaContext) {
 204             updateSchemaContext((UpdateSchemaContext) message);
 205         } else if (message instanceof ForwardedCommitTransaction) {
 206             handleForwardedCommit((ForwardedCommitTransaction) message);
 207         } else if (message.getClass()
 208             .equals(CreateTransaction.SERIALIZABLE_CLASS)) {
 209             if (isLeader()) {
 210                 createTransaction(CreateTransaction.fromSerializable(message));
 211             } else if (getLeader() != null) {
 212                 getLeader().forward(message, getContext());
 213             }
 214         } else if (message instanceof PeerAddressResolved) {
 215             PeerAddressResolved resolved = (PeerAddressResolved) message;
 216             setPeerAddress(resolved.getPeerId().toString(),
 217                 resolved.getPeerAddress());
 218         } else {
 219             super.onReceiveCommand(message);
 220         }
 221     }
 222
 223     private void closeTransactionChain(CloseTransactionChain closeTransactionChain) {
 224         DOMStoreTransactionChain chain =
 225             transactionChains.remove(closeTransactionChain.getTransactionChainId());
 226
 227         if(chain != null) {
 228             chain.close();
 229         }
 230     }
 231
 232     private ActorRef createTypedTransactionActor(
 233         int transactionType,
 234         ShardTransactionIdentifier transactionId,
 235         String transactionChainId ) {
 236
 237         DOMStoreTransactionFactory factory = store;
 238
 239         if(!transactionChainId.isEmpty()) {
 240             factory = transactionChains.get(transactionChainId);
 241             if(factory == null){
 242                 DOMStoreTransactionChain transactionChain = store.createTransactionChain();
 243                 transactionChains.put(transactionChainId, transactionChain);
 244                 factory = transactionChain;
 245             }
 246         }
 247
 248         if(this.schemaContext == null){
 249             throw new NullPointerException("schemaContext should not be null");
 250         }
 251
 252         if (transactionType
 253             == TransactionProxy.TransactionType.READ_ONLY.ordinal()) {
 254
 255             shardMBean.incrementReadOnlyTransactionCount();
 256
 257             return getContext().actorOf(
 258                 ShardTransaction.props(factory.newReadOnlyTransaction(), getSelf(),
 259                         schemaContext,datastoreContext, shardMBean), transactionId.toString());
 260
 261         } else if (transactionType
 262             == TransactionProxy.TransactionType.READ_WRITE.ordinal()) {
 263
 264             shardMBean.incrementReadWriteTransactionCount();
 265
 266             return getContext().actorOf(
 267                 ShardTransaction.props(factory.newReadWriteTransaction(), getSelf(),
 268                         schemaContext, datastoreContext, shardMBean), transactionId.toString());
 269
 270
 271         } else if (transactionType
 272             == TransactionProxy.TransactionType.WRITE_ONLY.ordinal()) {
 273
 274             shardMBean.incrementWriteOnlyTransactionCount();
 275
 276             return getContext().actorOf(
 277                 ShardTransaction.props(factory.newWriteOnlyTransaction(), getSelf(),
 278                         schemaContext, datastoreContext, shardMBean), transactionId.toString());
 279         } else {
 280             throw new IllegalArgumentException(
 281                 "Shard="+name + ":CreateTransaction message has unidentified transaction type="
 282                     + transactionType);
 283         }
 284     }
 285
 286     private void createTransaction(CreateTransaction createTransaction) {
 287         createTransaction(createTransaction.getTransactionType(),
 288             createTransaction.getTransactionId(), createTransaction.getTransactionChainId());
 289     }
 290
 291     private ActorRef createTransaction(int transactionType, String remoteTransactionId, String transactionChainId) {
 292
 293         ShardTransactionIdentifier transactionId =
 294             ShardTransactionIdentifier.builder()
 295                 .remoteTransactionId(remoteTransactionId)
 296                 .build();
 297         LOG.debug("Creating transaction : {} ", transactionId);
 298         ActorRef transactionActor =
 299             createTypedTransactionActor(transactionType, transactionId, transactionChainId);
 300
 301         getSender()
 302             .tell(new CreateTransactionReply(
 303                     Serialization.serializedActorPath(transactionActor),
 304                     remoteTransactionId).toSerializable(),
 305                 getSelf());
 306
 307         return transactionActor;
 308     }
 309
 310     private void syncCommitTransaction(DOMStoreWriteTransaction transaction)
 311         throws ExecutionException, InterruptedException {
 312         DOMStoreThreePhaseCommitCohort commitCohort = transaction.ready();
 313         commitCohort.preCommit().get();
 314         commitCohort.commit().get();
 315     }
 316
 317
 318     private void commit(final ActorRef sender, Object serialized) {
 319         Modification modification = MutableCompositeModification
 320             .fromSerializable(serialized, schemaContext);
 321         DOMStoreThreePhaseCommitCohort cohort =
 322             modificationToCohort.remove(serialized);
 323         if (cohort == null) {
 324             LOG.debug(
 325                 "Could not find cohort for modification : {}. Writing modification using a new transaction",
 326                 modification);
 327             DOMStoreWriteTransaction transaction =
 328                 store.newWriteOnlyTransaction();
 329             modification.apply(transaction);
 330             try {
 331                 syncCommitTransaction(transaction);
 332             } catch (InterruptedException | ExecutionException e) {
 333                 shardMBean.incrementFailedTransactionsCount();
 334                 LOG.error("Failed to commit", e);
 335                 return;
 336             }
 337             //we want to just apply the recovery commit and return
 338             shardMBean.incrementCommittedTransactionCount();
 339             return;
 340         }
 341
 342         final ListenableFuture<Void> future = cohort.commit();
 343         final ActorRef self = getSelf();
 344
 345         Futures.addCallback(future, new FutureCallback<Void>() {
 346             @Override
 347             public void onSuccess(Void v) {
 348                 sender.tell(new CommitTransactionReply().toSerializable(), self);
 349                 shardMBean.incrementCommittedTransactionCount();
 350                 shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
 351             }
 352
 353             @Override
 354             public void onFailure(Throwable t) {
 355                 LOG.error(t, "An exception happened during commit");
 356                 shardMBean.incrementFailedTransactionsCount();
 357                 sender.tell(new akka.actor.Status.Failure(t), self);
 358             }
 359         });
 360
 361     }
 362
 363     private void handleForwardedCommit(ForwardedCommitTransaction message) {
 364         Object serializedModification =
 365             message.getModification().toSerializable();
 366
 367         modificationToCohort
 368             .put(serializedModification, message.getCohort());
 369
 370         if (persistent) {
 371             this.persistData(getSender(), "identifier",
 372                 new CompositeModificationPayload(serializedModification));
 373         } else {
 374             this.commit(getSender(), serializedModification);
 375         }
 376     }
 377
 378     private void updateSchemaContext(UpdateSchemaContext message) {
 379         this.schemaContext = message.getSchemaContext();
 380         updateSchemaContext(message.getSchemaContext());
 381         store.onGlobalContextUpdated(message.getSchemaContext());
 382     }
 383
 384     @VisibleForTesting void updateSchemaContext(SchemaContext schemaContext) {
 385         store.onGlobalContextUpdated(schemaContext);
 386     }
 387
 388     private void registerChangeListener(
 389         RegisterChangeListener registerChangeListener) {
 390
 391         LOG.debug("registerDataChangeListener for {}", registerChangeListener
 392             .getPath());
 393
 394
 395         ActorSelection dataChangeListenerPath = getContext()
 396             .system().actorSelection(
 397                 registerChangeListener.getDataChangeListenerPath());
 398
 399
 400         // Notify the listener if notifications should be enabled or not
 401         // If this shard is the leader then it will enable notifications else
 402         // it will not
 403         dataChangeListenerPath
 404             .tell(new EnableNotification(isLeader()), getSelf());
 405
 406         // Now store a reference to the data change listener so it can be notified
 407         // at a later point if notifications should be enabled or disabled
 408         dataChangeListeners.add(dataChangeListenerPath);
 409
 410         AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>
 411             listener = new DataChangeListenerProxy(schemaContext, dataChangeListenerPath);
 412
 413         ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>
 414             registration = store.registerChangeListener(registerChangeListener.getPath(),
 415                 listener, registerChangeListener.getScope());
 416         ActorRef listenerRegistration =
 417             getContext().actorOf(
 418                 DataChangeListenerRegistration.props(registration));
 419
 420         LOG.debug(
 421             "registerDataChangeListener sending reply, listenerRegistrationPath = {} "
 422             , listenerRegistration.path().toString());
 423
 424         getSender()
 425             .tell(new RegisterChangeListenerReply(listenerRegistration.path()),
 426                 getSelf());
 427     }
 428
 429     private void createTransactionChain() {
 430         DOMStoreTransactionChain chain = store.createTransactionChain();
 431         ActorRef transactionChain = getContext().actorOf(
 432                 ShardTransactionChain.props(chain, schemaContext, datastoreContext, shardMBean));
 433         getSender().tell(new CreateTransactionChainReply(transactionChain.path()).toSerializable(),
 434                 getSelf());
 435     }
 436
 437     private boolean isMetricsCaptureEnabled(){
 438         CommonConfig config = new CommonConfig(getContext().system().settings().config());
 439         return config.isMetricCaptureEnabled();
 440     }
 441
 442     @Override protected void applyState(ActorRef clientActor, String identifier,
 443         Object data) {
 444
 445         if (data instanceof CompositeModificationPayload) {
 446             Object modification =
 447                 ((CompositeModificationPayload) data).getModification();
 448
 449             if (modification != null) {
 450                 commit(clientActor, modification);
 451             } else {
 452                 LOG.error(
 453                     "modification is null - this is very unexpected, clientActor = {}, identifier = {}",
 454                     identifier, clientActor.path().toString());
 455             }
 456
 457         } else {
 458             LOG.error("Unknown state received {}", data);
 459         }
 460
 461         // Update stats
 462         ReplicatedLogEntry lastLogEntry = getLastLogEntry();
 463
 464         if (lastLogEntry != null) {
 465             shardMBean.setLastLogIndex(lastLogEntry.getIndex());
 466             shardMBean.setLastLogTerm(lastLogEntry.getTerm());
 467         }
 468
 469         shardMBean.setCommitIndex(getCommitIndex());
 470         shardMBean.setLastApplied(getLastApplied());
 471
 472     }
 473
 474     @Override protected void createSnapshot() {
 475         if (createSnapshotTransaction == null) {
 476
 477             // Create a transaction. We are really going to treat the transaction as a worker
 478             // so that this actor does not get block building the snapshot
 479             createSnapshotTransaction = createTransaction(
 480                 TransactionProxy.TransactionType.READ_ONLY.ordinal(),
 481                 "createSnapshot", "");
 482
 483             createSnapshotTransaction.tell(
 484                 new ReadData(YangInstanceIdentifier.builder().build()).toSerializable(), self());
 485
 486         }
 487     }
 488
 489     @VisibleForTesting @Override protected void applySnapshot(ByteString snapshot) {
 490         // Since this will be done only on Recovery or when this actor is a Follower
 491         // we can safely commit everything in here. We not need to worry about event notifications
 492         // as they would have already been disabled on the follower
 493         try {
 494             DOMStoreWriteTransaction transaction = store.newWriteOnlyTransaction();
 495             NormalizedNodeMessages.Node serializedNode = NormalizedNodeMessages.Node.parseFrom(snapshot);
 496             NormalizedNode<?, ?> node = new NormalizedNodeToNodeCodec(schemaContext)
 497                 .decode(YangInstanceIdentifier.builder().build(), serializedNode);
 498
 499             // delete everything first
 500             transaction.delete(YangInstanceIdentifier.builder().build());
 501
 502             // Add everything from the remote node back
 503             transaction.write(YangInstanceIdentifier.builder().build(), node);
 504             syncCommitTransaction(transaction);
 505         } catch (InvalidProtocolBufferException | InterruptedException | ExecutionException e) {
 506             LOG.error(e, "An exception occurred when applying snapshot");
 507         }
 508     }
 509
 510     @Override protected void onStateChanged() {
 511         for (ActorSelection dataChangeListener : dataChangeListeners) {
 512             dataChangeListener
 513                 .tell(new EnableNotification(isLeader()), getSelf());
 514         }
 515
 516         if (getLeaderId() != null) {
 517             shardMBean.setLeader(getLeaderId());
 518         }
 519
 520         shardMBean.setRaftState(getRaftState().name());
 521         shardMBean.setCurrentTerm(getCurrentTerm());
 522
 523         // If this actor is no longer the leader close all the transaction chains
 524         if(!isLeader()){
 525             for(Map.Entry<String, DOMStoreTransactionChain> entry : transactionChains.entrySet()){
 526                 LOG.debug("onStateChanged: Closing transaction chain {} because shard {} is no longer the leader", entry.getKey(), getId());
 527                 entry.getValue().close();
 528             }
 529
 530             transactionChains.clear();
 531         }
 532     }
 533
 534     @Override public String persistenceId() {
 535         return this.name.toString();
 536     }
 537
 538
 539     private static class ShardConfigParams extends DefaultConfigParamsImpl {
 540         public static final FiniteDuration HEART_BEAT_INTERVAL =
 541             new FiniteDuration(500, TimeUnit.MILLISECONDS);
 542
 543         @Override public FiniteDuration getHeartBeatInterval() {
 544             return HEART_BEAT_INTERVAL;
 545         }
 546     }
 547
 548     private static class ShardCreator implements Creator<Shard> {
 549
 550         private static final long serialVersionUID = 1L;
 551
 552         final ShardIdentifier name;
 553         final Map<ShardIdentifier, String> peerAddresses;
 554         final DatastoreContext datastoreContext;
 555         final SchemaContext schemaContext;
 556
 557         ShardCreator(ShardIdentifier name, Map<ShardIdentifier, String> peerAddresses,
 558                 DatastoreContext datastoreContext, SchemaContext schemaContext) {
 559             this.name = name;
 560             this.peerAddresses = peerAddresses;
 561             this.datastoreContext = datastoreContext;
 562             this.schemaContext = schemaContext;
 563         }
 564
 565         @Override
 566         public Shard create() throws Exception {
 567             return new Shard(name, peerAddresses, datastoreContext, schemaContext);
 568         }
 569     }
 570
 571     @VisibleForTesting NormalizedNode readStore() throws ExecutionException, InterruptedException {
 572         DOMStoreReadTransaction transaction = store.newReadOnlyTransaction();
 573
 574         CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> future =
 575             transaction.read(YangInstanceIdentifier.builder().build());
 576
 577         NormalizedNode<?, ?> node = future.get().get();
 578
 579         transaction.close();
 580
 581         return node;
 582     }
 583
 584     @VisibleForTesting void writeToStore(YangInstanceIdentifier id, NormalizedNode node)
 585         throws ExecutionException, InterruptedException {
 586         DOMStoreWriteTransaction transaction = store.newWriteOnlyTransaction();
 587
 588         transaction.write(id, node);
 589
 590         syncCommitTransaction(transaction);
 591     }
 592
 593 }