opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/AbstractShardTest.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications 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 package org.opendaylight.controller.cluster.datastore;
   9
  10 import static org.junit.Assert.assertEquals;
  11 import static org.junit.Assert.assertNotNull;
  12 import static org.junit.Assert.assertTrue;
  13 import static org.junit.Assert.fail;
  14 import static org.mockito.Matchers.any;
  15 import static org.mockito.Mockito.doAnswer;
  16 import static org.mockito.Mockito.doReturn;
  17 import static org.mockito.Mockito.mock;
  18 import static org.opendaylight.controller.cluster.datastore.DataStoreVersions.CURRENT_VERSION;
  19 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.successfulCanCommit;
  20 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.successfulCommit;
  21 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.successfulPreCommit;
  22 import akka.actor.ActorRef;
  23 import akka.actor.PoisonPill;
  24 import akka.actor.Props;
  25 import akka.dispatch.Dispatchers;
  26 import akka.japi.Creator;
  27 import akka.pattern.Patterns;
  28 import akka.testkit.TestActorRef;
  29 import akka.util.Timeout;
  30 import com.google.common.base.Optional;
  31 import com.google.common.primitives.UnsignedLong;
  32 import com.google.common.util.concurrent.FutureCallback;
  33 import com.google.common.util.concurrent.ListenableFuture;
  34 import com.google.common.util.concurrent.Uninterruptibles;
  35 import java.io.IOException;
  36 import java.util.Collections;
  37 import java.util.HashMap;
  38 import java.util.Map;
  39 import java.util.Set;
  40 import java.util.concurrent.CountDownLatch;
  41 import java.util.concurrent.ExecutionException;
  42 import java.util.concurrent.TimeUnit;
  43 import java.util.concurrent.TimeoutException;
  44 import java.util.concurrent.atomic.AtomicInteger;
  45 import org.junit.After;
  46 import org.junit.Assert;
  47 import org.junit.Before;
  48 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  49 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  50 import org.opendaylight.controller.cluster.datastore.DatastoreContext.Builder;
  51 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
  52 import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
  53 import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction;
  54 import org.opendaylight.controller.cluster.datastore.modification.MergeModification;
  55 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
  56 import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
  57 import org.opendaylight.controller.cluster.datastore.persisted.CommitTransactionPayload;
  58 import org.opendaylight.controller.cluster.datastore.persisted.PreBoronShardDataTreeSnapshot;
  59 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
  60 import org.opendaylight.controller.cluster.raft.Snapshot;
  61 import org.opendaylight.controller.cluster.raft.TestActorFactory;
  62 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  63 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  64 import org.opendaylight.controller.md.cluster.datastore.model.CarsModel;
  65 import org.opendaylight.controller.md.cluster.datastore.model.TestModel;
  66 import org.opendaylight.yangtools.concepts.Identifier;
  67 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  68 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  69 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  70 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  71 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  72 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
  73 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  74 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  75 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateTip;
  76 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  77 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  78 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
  79 import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
  80 import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType;
  81 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  82 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
  83 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  84 import scala.concurrent.Await;
  85 import scala.concurrent.Future;
  86 import scala.concurrent.duration.Duration;
  87
  88 /**
  89  * Abstract base for shard unit tests.
  90  *
  91  * @author Thomas Pantelis
  92  */
  93 public abstract class AbstractShardTest extends AbstractActorTest{
  94     protected static final SchemaContext SCHEMA_CONTEXT = TestModel.createTestContext();
  95
  96     private static final AtomicInteger NEXT_SHARD_NUM = new AtomicInteger();
  97
  98     protected final ShardIdentifier shardID = ShardIdentifier.create("inventory", MemberName.forName("member-1"),
  99         "config" + NEXT_SHARD_NUM.getAndIncrement());
 100
 101     protected final Builder dataStoreContextBuilder = DatastoreContext.newBuilder().
 102             shardJournalRecoveryLogBatchSize(3).shardSnapshotBatchCount(5000).
 103             shardHeartbeatIntervalInMillis(100);
 104
 105     protected final TestActorFactory actorFactory = new TestActorFactory(getSystem());
 106
 107     @Before
 108     public void setUp() {
 109         InMemorySnapshotStore.clear();
 110         InMemoryJournal.clear();
 111     }
 112
 113     @After
 114     public void tearDown() {
 115         InMemorySnapshotStore.clear();
 116         InMemoryJournal.clear();
 117         actorFactory.close();
 118     }
 119
 120     protected DatastoreContext newDatastoreContext() {
 121         return dataStoreContextBuilder.build();
 122     }
 123
 124     protected Props newShardProps() {
 125         return newShardBuilder().props();
 126     }
 127
 128     protected Shard.Builder newShardBuilder() {
 129         return Shard.builder().id(shardID).datastoreContext(newDatastoreContext()).schemaContext(SCHEMA_CONTEXT);
 130     }
 131
 132     protected void testRecovery(final Set<Integer> listEntryKeys) throws Exception {
 133         // Create the actor and wait for recovery complete.
 134
 135         final int nListEntries = listEntryKeys.size();
 136
 137         final CountDownLatch recoveryComplete = new CountDownLatch(1);
 138
 139         @SuppressWarnings("serial")
 140         final Creator<Shard> creator = new Creator<Shard>() {
 141             @Override
 142             public Shard create() throws Exception {
 143                 return new Shard(newShardBuilder()) {
 144                     @Override
 145                     protected void onRecoveryComplete() {
 146                         try {
 147                             super.onRecoveryComplete();
 148                         } finally {
 149                             recoveryComplete.countDown();
 150                         }
 151                     }
 152                 };
 153             }
 154         };
 155
 156         final TestActorRef<Shard> shard = TestActorRef.create(getSystem(),
 157                 Props.create(new DelegatingShardCreator(creator)).withDispatcher(Dispatchers.DefaultDispatcherId()), "testRecovery");
 158
 159         assertEquals("Recovery complete", true, recoveryComplete.await(5, TimeUnit.SECONDS));
 160
 161         // Verify data in the data store.
 162
 163         final NormalizedNode<?, ?> outerList = readStore(shard, TestModel.OUTER_LIST_PATH);
 164         assertNotNull(TestModel.OUTER_LIST_QNAME.getLocalName() + " not found", outerList);
 165         assertTrue(TestModel.OUTER_LIST_QNAME.getLocalName() + " value is not Iterable",
 166                 outerList.getValue() instanceof Iterable);
 167         for(final Object entry: (Iterable<?>) outerList.getValue()) {
 168             assertTrue(TestModel.OUTER_LIST_QNAME.getLocalName() + " entry is not MapEntryNode",
 169                     entry instanceof MapEntryNode);
 170             final MapEntryNode mapEntry = (MapEntryNode)entry;
 171             final Optional<DataContainerChild<? extends PathArgument, ?>> idLeaf =
 172                     mapEntry.getChild(new YangInstanceIdentifier.NodeIdentifier(TestModel.ID_QNAME));
 173             assertTrue("Missing leaf " + TestModel.ID_QNAME.getLocalName(), idLeaf.isPresent());
 174             final Object value = idLeaf.get().getValue();
 175             assertTrue("Unexpected value for leaf "+ TestModel.ID_QNAME.getLocalName() + ": " + value,
 176                     listEntryKeys.remove(value));
 177         }
 178
 179         if(!listEntryKeys.isEmpty()) {
 180             fail("Missing " + TestModel.OUTER_LIST_QNAME.getLocalName() + " entries with keys: " +
 181                     listEntryKeys);
 182         }
 183
 184         assertEquals("Last log index", nListEntries,
 185                 shard.underlyingActor().getShardMBean().getLastLogIndex());
 186         assertEquals("Commit index", nListEntries,
 187                 shard.underlyingActor().getShardMBean().getCommitIndex());
 188         assertEquals("Last applied", nListEntries,
 189                 shard.underlyingActor().getShardMBean().getLastApplied());
 190
 191         shard.tell(PoisonPill.getInstance(), ActorRef.noSender());
 192     }
 193
 194     protected void verifyLastApplied(final TestActorRef<Shard> shard, final long expectedValue) {
 195         long lastApplied = -1;
 196         for(int i = 0; i < 20 * 5; i++) {
 197             lastApplied = shard.underlyingActor().getShardMBean().getLastApplied();
 198             if(lastApplied == expectedValue) {
 199                 return;
 200             }
 201             Uninterruptibles.sleepUninterruptibly(50, TimeUnit.MILLISECONDS);
 202         }
 203
 204         Assert.fail(String.format("Expected last applied: %d, Actual: %d", expectedValue, lastApplied));
 205     }
 206
 207     protected TipProducingDataTree createDelegatingMockDataTree() throws Exception {
 208         TipProducingDataTree actual = InMemoryDataTreeFactory.getInstance().create(TreeType.CONFIGURATION);
 209         final TipProducingDataTree mock = mock(TipProducingDataTree.class);
 210
 211         doAnswer(invocation -> {
 212             actual.validate(invocation.getArgumentAt(0, DataTreeModification.class));
 213             return null;
 214         }).when(mock).validate(any(DataTreeModification.class));
 215
 216         doAnswer(invocation -> {
 217             return actual.prepare(invocation.getArgumentAt(0, DataTreeModification.class));
 218         }).when(mock).prepare(any(DataTreeModification.class));
 219
 220         doAnswer(invocation -> {
 221             actual.commit(invocation.getArgumentAt(0, DataTreeCandidate.class));
 222             return null;
 223         }).when(mock).commit(any(DataTreeCandidate.class));
 224
 225         doAnswer(invocation -> {
 226             actual.setSchemaContext(invocation.getArgumentAt(0, SchemaContext.class));
 227             return null;
 228         }).when(mock).setSchemaContext(any(SchemaContext.class));
 229
 230         doAnswer(invocation -> {
 231             return actual.takeSnapshot();
 232         }).when(mock).takeSnapshot();
 233
 234         doAnswer(invocation -> {
 235             return actual.getRootPath();
 236         }).when(mock).getRootPath();
 237
 238         return mock;
 239     }
 240
 241     protected ShardDataTreeCohort mockShardDataTreeCohort() {
 242         ShardDataTreeCohort cohort = mock(ShardDataTreeCohort.class);
 243         DataTreeCandidate candidate = mockCandidate("candidate");
 244         successfulCanCommit(cohort);
 245         successfulPreCommit(cohort, candidate);
 246         successfulCommit(cohort);
 247         doReturn(candidate).when(cohort).getCandidate();
 248         return cohort;
 249     }
 250
 251     protected Map<TransactionIdentifier, CapturingShardDataTreeCohort> setupCohortDecorator(final Shard shard,
 252             final TransactionIdentifier... transactionIDs) {
 253         final Map<TransactionIdentifier, CapturingShardDataTreeCohort> cohortMap = new HashMap<>();
 254         for(TransactionIdentifier id: transactionIDs) {
 255             cohortMap.put(id, new CapturingShardDataTreeCohort());
 256         }
 257
 258         shard.getCommitCoordinator().setCohortDecorator(new ShardCommitCoordinator.CohortDecorator() {
 259             @Override
 260             public ShardDataTreeCohort decorate(final Identifier transactionID, final ShardDataTreeCohort actual) {
 261                 CapturingShardDataTreeCohort cohort = cohortMap.get(transactionID);
 262                 cohort.setDelegate(actual);
 263                 return cohort;
 264             }
 265         });
 266
 267         return cohortMap;
 268     }
 269
 270     protected BatchedModifications prepareBatchedModifications(final TransactionIdentifier transactionID,
 271                                                                final MutableCompositeModification modification) {
 272         return prepareBatchedModifications(transactionID, modification, false);
 273     }
 274
 275     protected static BatchedModifications prepareBatchedModifications(final TransactionIdentifier transactionID,
 276                                                              final MutableCompositeModification modification,
 277                                                              final boolean doCommitOnReady) {
 278         final BatchedModifications batchedModifications = new BatchedModifications(transactionID, CURRENT_VERSION);
 279         batchedModifications.addModification(modification);
 280         batchedModifications.setReady(true);
 281         batchedModifications.setDoCommitOnReady(doCommitOnReady);
 282         batchedModifications.setTotalMessagesSent(1);
 283         return batchedModifications;
 284     }
 285
 286     protected static BatchedModifications prepareBatchedModifications(final TransactionIdentifier transactionID,
 287             final YangInstanceIdentifier path, final NormalizedNode<?, ?> data, final boolean doCommitOnReady) {
 288         final MutableCompositeModification modification = new MutableCompositeModification();
 289         modification.addModification(new WriteModification(path, data));
 290         return prepareBatchedModifications(transactionID, modification, doCommitOnReady);
 291     }
 292
 293     protected static ForwardedReadyTransaction prepareForwardedReadyTransaction(final TestActorRef<Shard> shard,
 294             final TransactionIdentifier transactionID, final YangInstanceIdentifier path,
 295             final NormalizedNode<?, ?> data, final boolean doCommitOnReady) {
 296         ReadWriteShardDataTreeTransaction rwTx = shard.underlyingActor().getDataStore().
 297                 newReadWriteTransaction(transactionID);
 298         rwTx.getSnapshot().write(path, data);
 299         return new ForwardedReadyTransaction(transactionID, CURRENT_VERSION, rwTx, doCommitOnReady);
 300     }
 301
 302     public static NormalizedNode<?,?> readStore(final TestActorRef<? extends Shard> shard, final YangInstanceIdentifier id)
 303             throws ExecutionException, InterruptedException {
 304         return shard.underlyingActor().getDataStore().readNode(id).orNull();
 305     }
 306
 307     public static NormalizedNode<?,?> readStore(final DataTree store, final YangInstanceIdentifier id) {
 308         return store.takeSnapshot().readNode(id).orNull();
 309     }
 310
 311     public void writeToStore(final TestActorRef<Shard> shard, final YangInstanceIdentifier id,
 312             final NormalizedNode<?,?> node) throws InterruptedException, ExecutionException {
 313         Future<Object> future = Patterns.ask(shard, newBatchedModifications(nextTransactionId(), id, node, true, true, 1),
 314                 new Timeout(5, TimeUnit.SECONDS));
 315         try {
 316             Await.ready(future, Duration.create(5, TimeUnit.SECONDS));
 317         } catch(TimeoutException e) {
 318             throw new ExecutionException(e);
 319         }
 320     }
 321
 322     public static void writeToStore(final ShardDataTree store, final YangInstanceIdentifier id,
 323             final NormalizedNode<?,?> node) throws Exception {
 324         BatchedModifications batched = newBatchedModifications(nextTransactionId(), id, node, true, true, 1);
 325         DataTreeModification modification = store.getDataTree().takeSnapshot().newModification();
 326         batched.apply(modification);
 327         modification.ready();
 328         store.applyForeignCandidate(batched.getTransactionID(), store.getDataTree().prepare(modification));
 329     }
 330
 331     public void mergeToStore(final ShardDataTree store, final YangInstanceIdentifier id,
 332             final NormalizedNode<?,?> node) throws Exception {
 333         final BatchedModifications batched = new BatchedModifications(nextTransactionId(), CURRENT_VERSION);
 334         batched.addModification(new MergeModification(id, node));
 335         batched.setReady(true);
 336         batched.setDoCommitOnReady(true);
 337         batched.setTotalMessagesSent(1);
 338
 339         DataTreeModification modification = store.getDataTree().takeSnapshot().newModification();
 340         batched.apply(modification);
 341         modification.ready();
 342         store.applyForeignCandidate(batched.getTransactionID(), store.getDataTree().prepare(modification));
 343     }
 344
 345     public static void writeToStore(final DataTree store, final YangInstanceIdentifier id,
 346             final NormalizedNode<?,?> node) throws DataValidationFailedException {
 347         final DataTreeModification transaction = store.takeSnapshot().newModification();
 348
 349         transaction.write(id, node);
 350         transaction.ready();
 351         store.validate(transaction);
 352         final DataTreeCandidate candidate = store.prepare(transaction);
 353         store.commit(candidate);
 354     }
 355
 356     DataTree setupInMemorySnapshotStore() throws DataValidationFailedException {
 357         final DataTree testStore = InMemoryDataTreeFactory.getInstance().create(TreeType.OPERATIONAL);
 358         testStore.setSchemaContext(SCHEMA_CONTEXT);
 359
 360         writeToStore(testStore, TestModel.TEST_PATH, ImmutableNodes.containerNode(TestModel.TEST_QNAME));
 361
 362         final NormalizedNode<?, ?> root = readStore(testStore, YangInstanceIdentifier.EMPTY);
 363
 364         InMemorySnapshotStore.addSnapshot(shardID.toString(), Snapshot.create(
 365                 new PreBoronShardDataTreeSnapshot(root).serialize(),
 366                 Collections.<ReplicatedLogEntry>emptyList(), 0, 1, -1, -1));
 367         return testStore;
 368     }
 369
 370     static CommitTransactionPayload payloadForModification(final DataTree source, final DataTreeModification mod,
 371             final TransactionIdentifier transactionId) throws DataValidationFailedException, IOException {
 372         source.validate(mod);
 373         final DataTreeCandidate candidate = source.prepare(mod);
 374         source.commit(candidate);
 375         return CommitTransactionPayload.create(transactionId, candidate);
 376     }
 377
 378     static BatchedModifications newBatchedModifications(final TransactionIdentifier transactionID,
 379             final YangInstanceIdentifier path, final NormalizedNode<?, ?> data, final boolean ready, final boolean doCommitOnReady,
 380             final int messagesSent) {
 381         final BatchedModifications batched = new BatchedModifications(transactionID, CURRENT_VERSION);
 382         batched.addModification(new WriteModification(path, data));
 383         batched.setReady(ready);
 384         batched.setDoCommitOnReady(doCommitOnReady);
 385         batched.setTotalMessagesSent(messagesSent);
 386         return batched;
 387     }
 388
 389     @SuppressWarnings("unchecked")
 390     static void verifyOuterListEntry(final TestActorRef<Shard> shard, final Object expIDValue) throws Exception {
 391         final NormalizedNode<?, ?> outerList = readStore(shard, TestModel.OUTER_LIST_PATH);
 392         assertNotNull(TestModel.OUTER_LIST_QNAME.getLocalName() + " not found", outerList);
 393         assertTrue(TestModel.OUTER_LIST_QNAME.getLocalName() + " value is not Iterable",
 394                 outerList.getValue() instanceof Iterable);
 395         final Object entry = ((Iterable<Object>)outerList.getValue()).iterator().next();
 396         assertTrue(TestModel.OUTER_LIST_QNAME.getLocalName() + " entry is not MapEntryNode",
 397                 entry instanceof MapEntryNode);
 398         final MapEntryNode mapEntry = (MapEntryNode)entry;
 399         final Optional<DataContainerChild<? extends PathArgument, ?>> idLeaf =
 400                 mapEntry.getChild(new YangInstanceIdentifier.NodeIdentifier(TestModel.ID_QNAME));
 401         assertTrue("Missing leaf " + TestModel.ID_QNAME.getLocalName(), idLeaf.isPresent());
 402         assertEquals(TestModel.ID_QNAME.getLocalName() + " value", expIDValue, idLeaf.get().getValue());
 403     }
 404
 405     public static DataTreeCandidateTip mockCandidate(final String name) {
 406         final DataTreeCandidateTip mockCandidate = mock(DataTreeCandidateTip.class, name);
 407         final DataTreeCandidateNode mockCandidateNode = mock(DataTreeCandidateNode.class, name + "-node");
 408         doReturn(ModificationType.WRITE).when(mockCandidateNode).getModificationType();
 409         doReturn(Optional.of(ImmutableNodes.containerNode(CarsModel.CARS_QNAME))).when(mockCandidateNode).getDataAfter();
 410         doReturn(CarsModel.BASE_PATH).when(mockCandidate).getRootPath();
 411         doReturn(mockCandidateNode).when(mockCandidate).getRootNode();
 412         return mockCandidate;
 413     }
 414
 415     static DataTreeCandidateTip mockUnmodifiedCandidate(final String name) {
 416         final DataTreeCandidateTip mockCandidate = mock(DataTreeCandidateTip.class, name);
 417         final DataTreeCandidateNode mockCandidateNode = mock(DataTreeCandidateNode.class, name + "-node");
 418         doReturn(ModificationType.UNMODIFIED).when(mockCandidateNode).getModificationType();
 419         doReturn(YangInstanceIdentifier.EMPTY).when(mockCandidate).getRootPath();
 420         doReturn(mockCandidateNode).when(mockCandidate).getRootNode();
 421         return mockCandidate;
 422     }
 423
 424     static void commitTransaction(final DataTree store, final DataTreeModification modification) throws DataValidationFailedException {
 425         modification.ready();
 426         store.validate(modification);
 427         store.commit(store.prepare(modification));
 428     }
 429
 430     @SuppressWarnings("serial")
 431     public static final class DelegatingShardCreator implements Creator<Shard> {
 432         private final Creator<Shard> delegate;
 433
 434         DelegatingShardCreator(final Creator<Shard> delegate) {
 435             this.delegate = delegate;
 436         }
 437
 438         @Override
 439         public Shard create() throws Exception {
 440             return delegate.create();
 441         }
 442     }
 443
 444     public static class CapturingShardDataTreeCohort extends ShardDataTreeCohort {
 445         private volatile ShardDataTreeCohort delegate;
 446         private FutureCallback<Void> canCommit;
 447         private FutureCallback<DataTreeCandidate> preCommit;
 448         private FutureCallback<UnsignedLong> commit;
 449
 450         public void setDelegate(ShardDataTreeCohort delegate) {
 451             this.delegate = delegate;
 452         }
 453
 454         public FutureCallback<Void> getCanCommit() {
 455             assertNotNull("canCommit was not invoked", canCommit);
 456             return canCommit;
 457         }
 458
 459         public FutureCallback<DataTreeCandidate> getPreCommit() {
 460             assertNotNull("preCommit was not invoked", preCommit);
 461             return preCommit;
 462         }
 463
 464         public FutureCallback<UnsignedLong> getCommit() {
 465             assertNotNull("commit was not invoked", commit);
 466             return commit;
 467         }
 468
 469         @Override
 470         public TransactionIdentifier getIdentifier() {
 471             return delegate.getIdentifier();
 472         }
 473
 474         @Override
 475         DataTreeCandidateTip getCandidate() {
 476             return delegate.getCandidate();
 477         }
 478
 479         @Override
 480         DataTreeModification getDataTreeModification() {
 481             return delegate.getDataTreeModification();
 482         }
 483
 484         @Override
 485         public void canCommit(FutureCallback<Void> callback) {
 486             canCommit = mockFutureCallback(callback);
 487             delegate.canCommit(canCommit);
 488         }
 489
 490         @Override
 491         public void preCommit(FutureCallback<DataTreeCandidate> callback) {
 492             preCommit = mockFutureCallback(callback);
 493             delegate.preCommit(preCommit);
 494         }
 495
 496         @Override
 497         public void commit(FutureCallback<UnsignedLong> callback) {
 498             commit = mockFutureCallback(callback);
 499             delegate.commit(commit);
 500         }
 501
 502         @SuppressWarnings("unchecked")
 503         private <T> FutureCallback<T> mockFutureCallback(final FutureCallback<T> actual ) {
 504             FutureCallback<T> mock = mock(FutureCallback.class);
 505             doAnswer(invocation -> {
 506                 actual.onFailure(invocation.getArgumentAt(0, Throwable.class));
 507                 return null;
 508             }).when(mock).onFailure(any(Throwable.class));
 509
 510             doAnswer(invocation -> {
 511                 actual.onSuccess((T) invocation.getArgumentAt(0, Throwable.class));
 512                 return null;
 513             }).when(mock).onSuccess((T) any(Object.class));
 514
 515             return mock;
 516         }
 517
 518         @Override
 519         public ListenableFuture<Void> abort() {
 520             return delegate.abort();
 521         }
 522
 523         @Override
 524         public boolean isFailed() {
 525             return delegate.isFailed();
 526         }
 527
 528         @Override
 529         public State getState() {
 530             return delegate.getState();
 531         }
 532     }
 533 }