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

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