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

   1 /*
   2  * Copyright (c) 2015 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 static org.junit.Assert.assertEquals;
  12 import static org.junit.Assert.assertNotNull;
  13 import static org.junit.Assert.fail;
  14 import static org.mockito.Matchers.any;
  15 import static org.mockito.Matchers.anyBoolean;
  16 import static org.mockito.Matchers.eq;
  17 import static org.mockito.Mockito.atLeastOnce;
  18 import static org.mockito.Mockito.doNothing;
  19 import static org.mockito.Mockito.doReturn;
  20 import static org.mockito.Mockito.inOrder;
  21 import static org.mockito.Mockito.mock;
  22 import static org.mockito.Mockito.never;
  23 import static org.mockito.Mockito.reset;
  24 import static org.mockito.Mockito.verify;
  25 import static org.mockito.Mockito.verifyNoMoreInteractions;
  26 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.coordinatedCanCommit;
  27 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.coordinatedCommit;
  28 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.coordinatedPreCommit;
  29 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.immediate3PhaseCommit;
  30 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.immediateCanCommit;
  31 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.immediateCommit;
  32 import static org.opendaylight.controller.cluster.datastore.ShardDataTreeMocking.immediatePreCommit;
  33
  34 import com.google.common.base.Optional;
  35 import com.google.common.base.Ticker;
  36 import com.google.common.collect.Maps;
  37 import com.google.common.primitives.UnsignedLong;
  38 import com.google.common.util.concurrent.FutureCallback;
  39 import java.math.BigInteger;
  40 import java.util.ArrayList;
  41 import java.util.Collection;
  42 import java.util.List;
  43 import java.util.Map;
  44 import java.util.concurrent.ExecutionException;
  45 import java.util.function.Consumer;
  46 import org.junit.Before;
  47 import org.junit.Test;
  48 import org.mockito.ArgumentCaptor;
  49 import org.mockito.InOrder;
  50 import org.mockito.Mockito;
  51 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
  52 import org.opendaylight.controller.cluster.datastore.persisted.CommitTransactionPayload;
  53 import org.opendaylight.controller.md.cluster.datastore.model.CarsModel;
  54 import org.opendaylight.controller.md.cluster.datastore.model.PeopleModel;
  55 import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
  56 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  57 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  58 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  59 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  60 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  61 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;
  62 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  63 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  64 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
  65 import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType;
  66 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  67
  68 public class ShardDataTreeTest extends AbstractTest {
  69
  70     private final Shard mockShard = Mockito.mock(Shard.class);
  71     private ShardDataTree shardDataTree;
  72     private SchemaContext fullSchema;
  73
  74     @Before
  75     public void setUp() {
  76         doReturn(true).when(mockShard).canSkipPayload();
  77         doReturn(Ticker.systemTicker()).when(mockShard).ticker();
  78         doReturn(Mockito.mock(ShardStats.class)).when(mockShard).getShardMBean();
  79
  80         fullSchema = SchemaContextHelper.full();
  81
  82         shardDataTree = new ShardDataTree(mockShard, fullSchema, TreeType.OPERATIONAL);
  83     }
  84
  85     @Test
  86     public void testWrite() throws ExecutionException, InterruptedException {
  87         modify(false, true, true);
  88     }
  89
  90     @Test
  91     public void testMerge() throws ExecutionException, InterruptedException {
  92         modify(true, true, true);
  93     }
  94
  95     private void modify(final boolean merge, final boolean expectedCarsPresent, final boolean expectedPeoplePresent)
  96             throws ExecutionException, InterruptedException {
  97
  98         assertEquals(fullSchema, shardDataTree.getSchemaContext());
  99
 100         final ReadWriteShardDataTreeTransaction transaction =
 101                 shardDataTree.newReadWriteTransaction(nextTransactionId());
 102
 103         final DataTreeModification snapshot = transaction.getSnapshot();
 104
 105         assertNotNull(snapshot);
 106
 107         if (merge) {
 108             snapshot.merge(CarsModel.BASE_PATH, CarsModel.create());
 109             snapshot.merge(PeopleModel.BASE_PATH, PeopleModel.create());
 110         } else {
 111             snapshot.write(CarsModel.BASE_PATH, CarsModel.create());
 112             snapshot.write(PeopleModel.BASE_PATH, PeopleModel.create());
 113         }
 114
 115         final ShardDataTreeCohort cohort = shardDataTree.finishTransaction(transaction);
 116
 117         immediateCanCommit(cohort);
 118         immediatePreCommit(cohort);
 119         immediateCommit(cohort);
 120
 121         final ReadOnlyShardDataTreeTransaction readOnlyShardDataTreeTransaction =
 122                 shardDataTree.newReadOnlyTransaction(nextTransactionId());
 123
 124         final DataTreeSnapshot snapshot1 = readOnlyShardDataTreeTransaction.getSnapshot();
 125
 126         final Optional<NormalizedNode<?, ?>> optional = snapshot1.readNode(CarsModel.BASE_PATH);
 127
 128         assertEquals(expectedCarsPresent, optional.isPresent());
 129
 130         final Optional<NormalizedNode<?, ?>> optional1 = snapshot1.readNode(PeopleModel.BASE_PATH);
 131
 132         assertEquals(expectedPeoplePresent, optional1.isPresent());
 133     }
 134
 135     @Test
 136     public void bug4359AddRemoveCarOnce() throws ExecutionException, InterruptedException {
 137         final List<DataTreeCandidate> candidates = new ArrayList<>();
 138         candidates.add(addCar(shardDataTree));
 139         candidates.add(removeCar(shardDataTree));
 140
 141         final NormalizedNode<?, ?> expected = getCars(shardDataTree);
 142
 143         applyCandidates(shardDataTree, candidates);
 144
 145         final NormalizedNode<?, ?> actual = getCars(shardDataTree);
 146
 147         assertEquals(expected, actual);
 148     }
 149
 150     @Test
 151     public void bug4359AddRemoveCarTwice() throws ExecutionException, InterruptedException {
 152         final List<DataTreeCandidate> candidates = new ArrayList<>();
 153         candidates.add(addCar(shardDataTree));
 154         candidates.add(removeCar(shardDataTree));
 155         candidates.add(addCar(shardDataTree));
 156         candidates.add(removeCar(shardDataTree));
 157
 158         final NormalizedNode<?, ?> expected = getCars(shardDataTree);
 159
 160         applyCandidates(shardDataTree, candidates);
 161
 162         final NormalizedNode<?, ?> actual = getCars(shardDataTree);
 163
 164         assertEquals(expected, actual);
 165     }
 166
 167     @Test
 168     public void testListenerNotifiedOnApplySnapshot() throws Exception {
 169         DOMDataTreeChangeListener listener = mock(DOMDataTreeChangeListener.class);
 170         shardDataTree.registerTreeChangeListener(CarsModel.CAR_LIST_PATH.node(CarsModel.CAR_QNAME), listener);
 171
 172         addCar(shardDataTree, "optima");
 173
 174         verifyOnDataTreeChanged(listener, dtc -> {
 175             assertEquals("getModificationType", ModificationType.WRITE, dtc.getRootNode().getModificationType());
 176             assertEquals("getRootPath", CarsModel.newCarPath("optima"), dtc.getRootPath());
 177         });
 178
 179         addCar(shardDataTree, "sportage");
 180
 181         verifyOnDataTreeChanged(listener, dtc -> {
 182             assertEquals("getModificationType", ModificationType.WRITE, dtc.getRootNode().getModificationType());
 183             assertEquals("getRootPath", CarsModel.newCarPath("sportage"), dtc.getRootPath());
 184         });
 185
 186         ShardDataTree newDataTree = new ShardDataTree(mockShard, fullSchema, TreeType.OPERATIONAL);
 187         addCar(newDataTree, "optima");
 188         addCar(newDataTree, "murano");
 189
 190         shardDataTree.applySnapshot(newDataTree.takeStateSnapshot());
 191
 192         Map<YangInstanceIdentifier, ModificationType> expChanges = Maps.newHashMap();
 193         expChanges.put(CarsModel.newCarPath("optima"), ModificationType.WRITE);
 194         expChanges.put(CarsModel.newCarPath("murano"), ModificationType.WRITE);
 195         expChanges.put(CarsModel.newCarPath("sportage"), ModificationType.DELETE);
 196         verifyOnDataTreeChanged(listener, dtc -> {
 197             ModificationType expType = expChanges.remove(dtc.getRootPath());
 198             assertNotNull("Got unexpected change for " + dtc.getRootPath(), expType);
 199             assertEquals("getModificationType", expType, dtc.getRootNode().getModificationType());
 200         });
 201
 202         if (!expChanges.isEmpty()) {
 203             fail("Missing change notifications: " + expChanges);
 204         }
 205     }
 206
 207     @Test
 208     public void testPipelinedTransactionsWithCoordinatedCommits() throws Exception {
 209         doReturn(false).when(mockShard).canSkipPayload();
 210
 211         final ShardDataTreeCohort cohort1 = newShardDataTreeCohort(snapshot ->
 212             snapshot.write(CarsModel.BASE_PATH, CarsModel.emptyContainer()));
 213
 214         final ShardDataTreeCohort cohort2 = newShardDataTreeCohort(snapshot ->
 215             snapshot.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode()));
 216
 217         NormalizedNode<?, ?> peopleNode = PeopleModel.create();
 218         final ShardDataTreeCohort cohort3 = newShardDataTreeCohort(snapshot ->
 219             snapshot.write(PeopleModel.BASE_PATH, peopleNode));
 220
 221         YangInstanceIdentifier carPath = CarsModel.newCarPath("optima");
 222         MapEntryNode carNode = CarsModel.newCarEntry("optima", new BigInteger("100"));
 223         final ShardDataTreeCohort cohort4 = newShardDataTreeCohort(snapshot -> snapshot.write(carPath, carNode));
 224
 225         immediateCanCommit(cohort1);
 226         final FutureCallback<Void> canCommitCallback2 = coordinatedCanCommit(cohort2);
 227         final FutureCallback<Void> canCommitCallback3 = coordinatedCanCommit(cohort3);
 228         final FutureCallback<Void> canCommitCallback4 = coordinatedCanCommit(cohort4);
 229
 230         final FutureCallback<DataTreeCandidate> preCommitCallback1 = coordinatedPreCommit(cohort1);
 231         verify(preCommitCallback1).onSuccess(cohort1.getCandidate());
 232         verify(canCommitCallback2).onSuccess(null);
 233
 234         final FutureCallback<DataTreeCandidate> preCommitCallback2 = coordinatedPreCommit(cohort2);
 235         verify(preCommitCallback2).onSuccess(cohort2.getCandidate());
 236         verify(canCommitCallback3).onSuccess(null);
 237
 238         final FutureCallback<DataTreeCandidate> preCommitCallback3 = coordinatedPreCommit(cohort3);
 239         verify(preCommitCallback3).onSuccess(cohort3.getCandidate());
 240         verify(canCommitCallback4).onSuccess(null);
 241
 242         final FutureCallback<DataTreeCandidate> preCommitCallback4 = coordinatedPreCommit(cohort4);
 243         verify(preCommitCallback4).onSuccess(cohort4.getCandidate());
 244
 245         final FutureCallback<UnsignedLong> commitCallback2 = coordinatedCommit(cohort2);
 246         verify(mockShard, never()).persistPayload(eq(cohort1.getIdentifier()), any(CommitTransactionPayload.class),
 247                 anyBoolean());
 248         verifyNoMoreInteractions(commitCallback2);
 249
 250         final FutureCallback<UnsignedLong> commitCallback4 = coordinatedCommit(cohort4);
 251         verify(mockShard, never()).persistPayload(eq(cohort4.getIdentifier()), any(CommitTransactionPayload.class),
 252                 anyBoolean());
 253         verifyNoMoreInteractions(commitCallback4);
 254
 255         final FutureCallback<UnsignedLong> commitCallback1 = coordinatedCommit(cohort1);
 256         InOrder inOrder = inOrder(mockShard);
 257         inOrder.verify(mockShard).persistPayload(eq(cohort1.getIdentifier()), any(CommitTransactionPayload.class),
 258                 eq(true));
 259         inOrder.verify(mockShard).persistPayload(eq(cohort2.getIdentifier()), any(CommitTransactionPayload.class),
 260                 eq(false));
 261         verifyNoMoreInteractions(commitCallback1);
 262         verifyNoMoreInteractions(commitCallback2);
 263
 264         final FutureCallback<UnsignedLong> commitCallback3 = coordinatedCommit(cohort3);
 265         inOrder = inOrder(mockShard);
 266         inOrder.verify(mockShard).persistPayload(eq(cohort3.getIdentifier()), any(CommitTransactionPayload.class),
 267                 eq(true));
 268         inOrder.verify(mockShard).persistPayload(eq(cohort4.getIdentifier()), any(CommitTransactionPayload.class),
 269                 eq(false));
 270         verifyNoMoreInteractions(commitCallback3);
 271         verifyNoMoreInteractions(commitCallback4);
 272
 273         final ShardDataTreeCohort cohort5 = newShardDataTreeCohort(snapshot ->
 274             snapshot.merge(CarsModel.BASE_PATH, CarsModel.emptyContainer()));
 275         final FutureCallback<Void> canCommitCallback5 = coordinatedCanCommit(cohort5);
 276
 277         // The payload instance doesn't matter - it just needs to be of type CommitTransactionPayload.
 278         CommitTransactionPayload mockPayload = CommitTransactionPayload.create(nextTransactionId(),
 279                 cohort1.getCandidate());
 280         shardDataTree.applyReplicatedPayload(cohort1.getIdentifier(), mockPayload);
 281         shardDataTree.applyReplicatedPayload(cohort2.getIdentifier(), mockPayload);
 282         shardDataTree.applyReplicatedPayload(cohort3.getIdentifier(), mockPayload);
 283         shardDataTree.applyReplicatedPayload(cohort4.getIdentifier(), mockPayload);
 284
 285         inOrder = inOrder(commitCallback1, commitCallback2, commitCallback3, commitCallback4);
 286         inOrder.verify(commitCallback1).onSuccess(any(UnsignedLong.class));
 287         inOrder.verify(commitCallback2).onSuccess(any(UnsignedLong.class));
 288         inOrder.verify(commitCallback3).onSuccess(any(UnsignedLong.class));
 289         inOrder.verify(commitCallback4).onSuccess(any(UnsignedLong.class));
 290
 291         verify(canCommitCallback5).onSuccess(null);
 292
 293         final DataTreeSnapshot snapshot =
 294                 shardDataTree.newReadOnlyTransaction(nextTransactionId()).getSnapshot();
 295         Optional<NormalizedNode<?, ?>> optional = snapshot.readNode(carPath);
 296         assertEquals("Car node present", true, optional.isPresent());
 297         assertEquals("Car node", carNode, optional.get());
 298
 299         optional = snapshot.readNode(PeopleModel.BASE_PATH);
 300         assertEquals("People node present", true, optional.isPresent());
 301         assertEquals("People node", peopleNode, optional.get());
 302     }
 303
 304     @Test
 305     public void testPipelinedTransactionsWithImmediateCommits() throws Exception {
 306         doReturn(false).when(mockShard).canSkipPayload();
 307
 308         final ShardDataTreeCohort cohort1 = newShardDataTreeCohort(snapshot ->
 309             snapshot.write(CarsModel.BASE_PATH, CarsModel.emptyContainer()));
 310
 311         final ShardDataTreeCohort cohort2 = newShardDataTreeCohort(snapshot ->
 312             snapshot.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode()));
 313
 314         YangInstanceIdentifier carPath = CarsModel.newCarPath("optima");
 315         MapEntryNode carNode = CarsModel.newCarEntry("optima", new BigInteger("100"));
 316         final ShardDataTreeCohort cohort3 = newShardDataTreeCohort(snapshot -> snapshot.write(carPath, carNode));
 317
 318         final FutureCallback<UnsignedLong> commitCallback2 = immediate3PhaseCommit(cohort2);
 319         final FutureCallback<UnsignedLong> commitCallback3 = immediate3PhaseCommit(cohort3);
 320         final FutureCallback<UnsignedLong> commitCallback1 = immediate3PhaseCommit(cohort1);
 321
 322         InOrder inOrder = inOrder(mockShard);
 323         inOrder.verify(mockShard).persistPayload(eq(cohort1.getIdentifier()), any(CommitTransactionPayload.class),
 324                 eq(true));
 325         inOrder.verify(mockShard).persistPayload(eq(cohort2.getIdentifier()), any(CommitTransactionPayload.class),
 326                 eq(true));
 327         inOrder.verify(mockShard).persistPayload(eq(cohort3.getIdentifier()), any(CommitTransactionPayload.class),
 328                 eq(false));
 329
 330         // The payload instance doesn't matter - it just needs to be of type CommitTransactionPayload.
 331         CommitTransactionPayload mockPayload = CommitTransactionPayload.create(nextTransactionId(),
 332                 cohort1.getCandidate());
 333         shardDataTree.applyReplicatedPayload(cohort1.getIdentifier(), mockPayload);
 334         shardDataTree.applyReplicatedPayload(cohort2.getIdentifier(), mockPayload);
 335         shardDataTree.applyReplicatedPayload(cohort3.getIdentifier(), mockPayload);
 336
 337         inOrder = inOrder(commitCallback1, commitCallback2, commitCallback3);
 338         inOrder.verify(commitCallback1).onSuccess(any(UnsignedLong.class));
 339         inOrder.verify(commitCallback2).onSuccess(any(UnsignedLong.class));
 340         inOrder.verify(commitCallback3).onSuccess(any(UnsignedLong.class));
 341
 342         final DataTreeSnapshot snapshot =
 343                 shardDataTree.newReadOnlyTransaction(nextTransactionId()).getSnapshot();
 344         Optional<NormalizedNode<?, ?>> optional = snapshot.readNode(carPath);
 345         assertEquals("Car node present", true, optional.isPresent());
 346         assertEquals("Car node", carNode, optional.get());
 347     }
 348
 349     @SuppressWarnings("unchecked")
 350     @Test
 351     public void testAbortWithPendingCommits() throws Exception {
 352         doReturn(false).when(mockShard).canSkipPayload();
 353
 354         final ShardDataTreeCohort cohort1 = newShardDataTreeCohort(snapshot ->
 355             snapshot.write(CarsModel.BASE_PATH, CarsModel.emptyContainer()));
 356
 357         final ShardDataTreeCohort cohort2 = newShardDataTreeCohort(snapshot ->
 358             snapshot.write(PeopleModel.BASE_PATH, PeopleModel.create()));
 359
 360         final ShardDataTreeCohort cohort3 = newShardDataTreeCohort(snapshot ->
 361             snapshot.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode()));
 362
 363         YangInstanceIdentifier carPath = CarsModel.newCarPath("optima");
 364         MapEntryNode carNode = CarsModel.newCarEntry("optima", new BigInteger("100"));
 365         final ShardDataTreeCohort cohort4 = newShardDataTreeCohort(snapshot -> snapshot.write(carPath, carNode));
 366
 367         coordinatedCanCommit(cohort2);
 368         immediateCanCommit(cohort1);
 369         coordinatedCanCommit(cohort3);
 370         coordinatedCanCommit(cohort4);
 371
 372         coordinatedPreCommit(cohort1);
 373         coordinatedPreCommit(cohort2);
 374         coordinatedPreCommit(cohort3);
 375
 376         FutureCallback<Void> mockAbortCallback = mock(FutureCallback.class);
 377         doNothing().when(mockAbortCallback).onSuccess(null);
 378         cohort2.abort(mockAbortCallback);
 379         verify(mockAbortCallback).onSuccess(null);
 380
 381         coordinatedPreCommit(cohort4);
 382         coordinatedCommit(cohort1);
 383         coordinatedCommit(cohort3);
 384         coordinatedCommit(cohort4);
 385
 386         InOrder inOrder = inOrder(mockShard);
 387         inOrder.verify(mockShard).persistPayload(eq(cohort1.getIdentifier()), any(CommitTransactionPayload.class),
 388                 eq(false));
 389         inOrder.verify(mockShard).persistPayload(eq(cohort3.getIdentifier()), any(CommitTransactionPayload.class),
 390                 eq(false));
 391         inOrder.verify(mockShard).persistPayload(eq(cohort4.getIdentifier()), any(CommitTransactionPayload.class),
 392                 eq(false));
 393
 394         // The payload instance doesn't matter - it just needs to be of type CommitTransactionPayload.
 395         CommitTransactionPayload mockPayload = CommitTransactionPayload.create(nextTransactionId(),
 396                 cohort1.getCandidate());
 397         shardDataTree.applyReplicatedPayload(cohort1.getIdentifier(), mockPayload);
 398         shardDataTree.applyReplicatedPayload(cohort3.getIdentifier(), mockPayload);
 399         shardDataTree.applyReplicatedPayload(cohort4.getIdentifier(), mockPayload);
 400
 401         final DataTreeSnapshot snapshot =
 402                 shardDataTree.newReadOnlyTransaction(nextTransactionId()).getSnapshot();
 403         Optional<NormalizedNode<?, ?>> optional = snapshot.readNode(carPath);
 404         assertEquals("Car node present", true, optional.isPresent());
 405         assertEquals("Car node", carNode, optional.get());
 406     }
 407
 408     @SuppressWarnings("unchecked")
 409     @Test
 410     public void testAbortWithFailedRebase() throws Exception {
 411         final ShardDataTreeCohort cohort1 = newShardDataTreeCohort(snapshot ->
 412             snapshot.write(CarsModel.BASE_PATH, CarsModel.emptyContainer()));
 413
 414         final ShardDataTreeCohort cohort2 = newShardDataTreeCohort(snapshot ->
 415             snapshot.write(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode()));
 416
 417         NormalizedNode<?, ?> peopleNode = PeopleModel.create();
 418         final ShardDataTreeCohort cohort3 = newShardDataTreeCohort(snapshot ->
 419             snapshot.write(PeopleModel.BASE_PATH, peopleNode));
 420
 421         immediateCanCommit(cohort1);
 422         FutureCallback<Void> canCommitCallback2 = coordinatedCanCommit(cohort2);
 423
 424         coordinatedPreCommit(cohort1);
 425         verify(canCommitCallback2).onSuccess(null);
 426
 427         FutureCallback<Void> mockAbortCallback = mock(FutureCallback.class);
 428         doNothing().when(mockAbortCallback).onSuccess(null);
 429         cohort1.abort(mockAbortCallback);
 430         verify(mockAbortCallback).onSuccess(null);
 431
 432         FutureCallback<DataTreeCandidate> preCommitCallback2 = coordinatedPreCommit(cohort2);
 433         verify(preCommitCallback2).onFailure(any(Throwable.class));
 434
 435         immediateCanCommit(cohort3);
 436         immediatePreCommit(cohort3);
 437         immediateCommit(cohort3);
 438
 439         final DataTreeSnapshot snapshot =
 440                 shardDataTree.newReadOnlyTransaction(nextTransactionId()).getSnapshot();
 441         Optional<NormalizedNode<?, ?>> optional = snapshot.readNode(PeopleModel.BASE_PATH);
 442         assertEquals("People node present", true, optional.isPresent());
 443         assertEquals("People node", peopleNode, optional.get());
 444     }
 445
 446     private ShardDataTreeCohort newShardDataTreeCohort(final DataTreeOperation operation) {
 447         final ReadWriteShardDataTreeTransaction transaction =
 448                 shardDataTree.newReadWriteTransaction(nextTransactionId());
 449         final DataTreeModification snapshot = transaction.getSnapshot();
 450         operation.execute(snapshot);
 451         return shardDataTree.finishTransaction(transaction);
 452     }
 453
 454     @SuppressWarnings({ "rawtypes", "unchecked" })
 455     private static void verifyOnDataTreeChanged(final DOMDataTreeChangeListener listener,
 456             final Consumer<DataTreeCandidate> callback) {
 457         ArgumentCaptor<Collection> changes = ArgumentCaptor.forClass(Collection.class);
 458         verify(listener, atLeastOnce()).onDataTreeChanged(changes.capture());
 459         for (Collection list : changes.getAllValues()) {
 460             for (Object dtc : list) {
 461                 callback.accept((DataTreeCandidate)dtc);
 462             }
 463         }
 464
 465         reset(listener);
 466     }
 467
 468     private static NormalizedNode<?, ?> getCars(final ShardDataTree shardDataTree) {
 469         final ReadOnlyShardDataTreeTransaction readOnlyShardDataTreeTransaction =
 470                 shardDataTree.newReadOnlyTransaction(nextTransactionId());
 471         final DataTreeSnapshot snapshot1 = readOnlyShardDataTreeTransaction.getSnapshot();
 472
 473         final Optional<NormalizedNode<?, ?>> optional = snapshot1.readNode(CarsModel.BASE_PATH);
 474
 475         assertEquals(true, optional.isPresent());
 476
 477         return optional.get();
 478     }
 479
 480     private static DataTreeCandidate addCar(final ShardDataTree shardDataTree)
 481             throws ExecutionException, InterruptedException {
 482         return addCar(shardDataTree, "altima");
 483     }
 484
 485     private static DataTreeCandidate addCar(final ShardDataTree shardDataTree, final String name)
 486             throws ExecutionException, InterruptedException {
 487         return doTransaction(shardDataTree, snapshot -> {
 488             snapshot.merge(CarsModel.BASE_PATH, CarsModel.emptyContainer());
 489             snapshot.merge(CarsModel.CAR_LIST_PATH, CarsModel.newCarMapNode());
 490             snapshot.write(CarsModel.newCarPath(name), CarsModel.newCarEntry(name, new BigInteger("100")));
 491         });
 492     }
 493
 494     private static DataTreeCandidate removeCar(final ShardDataTree shardDataTree)
 495             throws ExecutionException, InterruptedException {
 496         return doTransaction(shardDataTree, snapshot -> snapshot.delete(CarsModel.newCarPath("altima")));
 497     }
 498
 499     @FunctionalInterface
 500     private interface DataTreeOperation {
 501         void execute(DataTreeModification snapshot);
 502     }
 503
 504     private static DataTreeCandidate doTransaction(final ShardDataTree shardDataTree,
 505             final DataTreeOperation operation) throws ExecutionException, InterruptedException {
 506         final ReadWriteShardDataTreeTransaction transaction =
 507                 shardDataTree.newReadWriteTransaction(nextTransactionId());
 508         final DataTreeModification snapshot = transaction.getSnapshot();
 509         operation.execute(snapshot);
 510         final ShardDataTreeCohort cohort = shardDataTree.finishTransaction(transaction);
 511
 512         immediateCanCommit(cohort);
 513         immediatePreCommit(cohort);
 514         final DataTreeCandidate candidate = cohort.getCandidate();
 515         immediateCommit(cohort);
 516
 517         return candidate;
 518     }
 519
 520     private static DataTreeCandidate applyCandidates(final ShardDataTree shardDataTree,
 521             final List<DataTreeCandidate> candidates) throws ExecutionException, InterruptedException {
 522         final ReadWriteShardDataTreeTransaction transaction =
 523                 shardDataTree.newReadWriteTransaction(nextTransactionId());
 524         final DataTreeModification snapshot = transaction.getSnapshot();
 525         for (final DataTreeCandidate candidateTip : candidates) {
 526             DataTreeCandidates.applyToModification(snapshot, candidateTip);
 527         }
 528         final ShardDataTreeCohort cohort = shardDataTree.finishTransaction(transaction);
 529
 530         immediateCanCommit(cohort);
 531         immediatePreCommit(cohort);
 532         final DataTreeCandidate candidate = cohort.getCandidate();
 533         immediateCommit(cohort);
 534
 535         return candidate;
 536     }
 537 }