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