Code cleanup to faciliate Checkstyle enforcement. (#1148)

No functional change.

amazon-kinesis-client/src/main/java/software/amazon/kinesis/checkpoint/ShardRecordProcessorCheckpointer.java

@@ -144,7 +144,8 @@ public class ShardRecordProcessorCheckpointer implements RecordProcessorCheckpoi
      * {@inheritDoc}
      */
     @Override
-    public PreparedCheckpointer prepareCheckpoint(byte[] applicationState) throws KinesisClientLibDependencyException, InvalidStateException, ThrottlingException, ShutdownException {
+    public PreparedCheckpointer prepareCheckpoint(byte[] applicationState)
+            throws KinesisClientLibDependencyException, InvalidStateException, ThrottlingException, ShutdownException {
         return prepareCheckpoint(largestPermittedCheckpointValue.sequenceNumber(), applicationState);
     }
 
@@ -152,7 +153,8 @@ public class ShardRecordProcessorCheckpointer implements RecordProcessorCheckpoi
      * {@inheritDoc}
      */
     @Override
-    public PreparedCheckpointer prepareCheckpoint(Record record, byte[] applicationState) throws KinesisClientLibDependencyException, InvalidStateException, ThrottlingException, ShutdownException {
+    public PreparedCheckpointer prepareCheckpoint(Record record, byte[] applicationState)
+            throws KinesisClientLibDependencyException, InvalidStateException, ThrottlingException, ShutdownException {
         //
         // TODO: UserRecord Deprecation
         //

amazon-kinesis-client/src/main/java/software/amazon/kinesis/checkpoint/dynamodb/DynamoDBCheckpointer.java

@@ -103,7 +103,8 @@ public class DynamoDBCheckpointer implements Checkpointer {
     }
 
     @Override
-    public void prepareCheckpoint(String leaseKey, ExtendedSequenceNumber pendingCheckpoint, String concurrencyToken, byte[] pendingCheckpointState) throws KinesisClientLibException {
+    public void prepareCheckpoint(String leaseKey, ExtendedSequenceNumber pendingCheckpoint, String concurrencyToken,
+            byte[] pendingCheckpointState) throws KinesisClientLibException {
         try {
             boolean wasSuccessful =
                     prepareCheckpoint(leaseKey, pendingCheckpoint, UUID.fromString(concurrencyToken), pendingCheckpointState);

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/HashKeyRangeForLease.java

@@ -23,10 +23,11 @@ import software.amazon.awssdk.services.kinesis.model.HashKeyRange;
 
 import java.math.BigInteger;
 
-@Value @Accessors(fluent = true)
 /**
  * Lease POJO to hold the starting hashkey range and ending hashkey range of kinesis shards.
  */
+@Accessors(fluent = true)
+@Value
 public class HashKeyRangeForLease {
 
     private final BigInteger startingHashKey;

amazon-kinesis-client/src/main/java/software/amazon/kinesis/coordinator/NoOpWorkerStateChangeListener.java

@@ -16,15 +16,15 @@ package software.amazon.kinesis.coordinator;
 
 public class NoOpWorkerStateChangeListener implements WorkerStateChangeListener {
 
-	/**
+    /**
-	 * Empty constructor for NoOp Worker State Change Listener
+     * Empty constructor for NoOp Worker State Change Listener
-	 */
+     */
-	public NoOpWorkerStateChangeListener() {
+    public NoOpWorkerStateChangeListener() {
 
-	}
+    }
 
-	@Override
+    @Override
-	public void onWorkerStateChange(WorkerState newState) {
+    public void onWorkerStateChange(WorkerState newState) {
 
-	}
+    }
 }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/coordinator/PeriodicShardSyncManager.java

@@ -348,7 +348,7 @@ class PeriodicShardSyncManager {
                             ((MultiStreamLease) lease).shardId() :
                             lease.leaseKey();
                     final Shard shard = kinesisShards.get(shardId);
-                    if(shard == null) {
+                    if (shard == null) {
                         return lease;
                     }
                     lease.hashKeyRange(fromHashKeyRange(shard.hashKeyRange()));
@@ -372,7 +372,7 @@ class PeriodicShardSyncManager {
             List<Lease> leasesWithHashKeyRanges) {
         // Sort the hash ranges by starting hash key.
         List<Lease> sortedLeasesWithHashKeyRanges = sortLeasesByHashRange(leasesWithHashKeyRanges);
-        if(sortedLeasesWithHashKeyRanges.isEmpty()) {
+        if (sortedLeasesWithHashKeyRanges.isEmpty()) {
             log.error("No leases with valid hashranges found for stream {}", streamIdentifier);
             return Optional.of(new HashRangeHole());
         }
@@ -417,8 +417,9 @@ class PeriodicShardSyncManager {
 
     @VisibleForTesting
     static List<Lease> sortLeasesByHashRange(List<Lease> leasesWithHashKeyRanges) {
-        if (leasesWithHashKeyRanges.size() == 0 || leasesWithHashKeyRanges.size() == 1)
+        if (leasesWithHashKeyRanges.size() == 0 || leasesWithHashKeyRanges.size() == 1) {
             return leasesWithHashKeyRanges;
+        }
         Collections.sort(leasesWithHashKeyRanges, new HashKeyRangeComparator());
         return leasesWithHashKeyRanges;
     }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/coordinator/Scheduler.java

@@ -544,7 +544,8 @@ public class Scheduler implements Runnable {
                 final Map<Boolean, Set<StreamIdentifier>> staleStreamIdDeletionDecisionMap = staleStreamDeletionMap.keySet().stream().collect(Collectors
                         .partitioningBy(newStreamConfigMap::containsKey, Collectors.toSet()));
                 final Set<StreamIdentifier> staleStreamIdsToBeDeleted = staleStreamIdDeletionDecisionMap.get(false).stream().filter(streamIdentifier ->
-                        Duration.between(staleStreamDeletionMap.get(streamIdentifier), Instant.now()).toMillis() >= waitPeriodToDeleteOldStreams.toMillis()).collect(Collectors.toSet());
+                        Duration.between(staleStreamDeletionMap.get(streamIdentifier), Instant.now()).toMillis() >= waitPeriodToDeleteOldStreams.toMillis())
+                        .collect(Collectors.toSet());
                 // These are the streams which are deleted in Kinesis and we encounter resource not found during
                 // shardSyncTask. This is applicable in MultiStreamMode only, in case of SingleStreamMode, store will
                 // not have any data.
@@ -611,7 +612,7 @@ public class Scheduler implements Runnable {
     }
 
     private void removeStreamsFromStaleStreamsList(Set<StreamIdentifier> streamIdentifiers) {
-        for(StreamIdentifier streamIdentifier : streamIdentifiers) {
+        for (StreamIdentifier streamIdentifier : streamIdentifiers) {
             staleStreamDeletionMap.remove(streamIdentifier);
         }
     }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/coordinator/WorkerStateChangeListener.java

@@ -19,16 +19,16 @@ package software.amazon.kinesis.coordinator;
  */
 @FunctionalInterface
 public interface WorkerStateChangeListener {
-	enum WorkerState {
+    enum WorkerState {
-		CREATED,
+        CREATED,
-		INITIALIZING,
+        INITIALIZING,
-		STARTED,
+        STARTED,
-		SHUT_DOWN_STARTED,
+        SHUT_DOWN_STARTED,
-		SHUT_DOWN
+        SHUT_DOWN
-	}
+    }
 
-	void onWorkerStateChange(WorkerState newState);
+    void onWorkerStateChange(WorkerState newState);
 
-	default void onAllInitializationAttemptsFailed(Throwable e) {
+    default void onAllInitializationAttemptsFailed(Throwable e) {
-	}
+    }
 }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/HierarchicalShardSyncer.java

@@ -80,7 +80,7 @@ public class HierarchicalShardSyncer {
 
     private static final String MIN_HASH_KEY = BigInteger.ZERO.toString();
     private static final String MAX_HASH_KEY = new BigInteger("2").pow(128).subtract(BigInteger.ONE).toString();
-    private static final int retriesForCompleteHashRange = 3;
+    private static final int RETRIES_FOR_COMPLETE_HASH_RANGE = 3;
 
     private static final long DELAY_BETWEEN_LIST_SHARDS_MILLIS = 1000;
 
@@ -98,7 +98,7 @@ public class HierarchicalShardSyncer {
         this.deletedStreamListProvider = deletedStreamListProvider;
     }
 
-    private static final BiFunction<Lease, MultiStreamArgs, String> shardIdFromLeaseDeducer =
+    private static final BiFunction<Lease, MultiStreamArgs, String> SHARD_ID_FROM_LEASE_DEDUCER =
             (lease, multiStreamArgs) ->
             multiStreamArgs.isMultiStreamMode() ?
                     ((MultiStreamLease) lease).shardId() :
@@ -129,7 +129,9 @@ public class HierarchicalShardSyncer {
                 isLeaseTableEmpty);
     }
 
-    //Provide a pre-collcted list of shards to avoid calling ListShards API
+    /**
+     * Provide a pre-collected list of shards to avoid calling ListShards API
+     */
     public synchronized boolean checkAndCreateLeaseForNewShards(@NonNull final ShardDetector shardDetector,
             final LeaseRefresher leaseRefresher, final InitialPositionInStreamExtended initialPosition,
             List<Shard> latestShards, final boolean ignoreUnexpectedChildShards, final MetricsScope scope, final boolean isLeaseTableEmpty)
@@ -163,7 +165,7 @@ public class HierarchicalShardSyncer {
             final long startTime = System.currentTimeMillis();
             boolean success = false;
             try {
-                if(leaseRefresher.createLeaseIfNotExists(lease)) {
+                if (leaseRefresher.createLeaseIfNotExists(lease)) {
                     createdLeases.add(lease);
                 }
                 success = true;
@@ -268,7 +270,7 @@ public class HierarchicalShardSyncer {
 
         List<Shard> shards;
 
-        for (int i = 0; i < retriesForCompleteHashRange; i++) {
+        for (int i = 0; i < RETRIES_FOR_COMPLETE_HASH_RANGE; i++) {
             shards = shardDetector.listShardsWithFilter(shardFilter);
 
             if (shards == null) {
@@ -284,7 +286,7 @@ public class HierarchicalShardSyncer {
         }
 
         throw new KinesisClientLibIOException("Hash range of shards returned for " + streamName + " was incomplete after "
-                + retriesForCompleteHashRange + " retries.");
+                + RETRIES_FOR_COMPLETE_HASH_RANGE + " retries.");
     }
 
     private List<Shard> getShardList(@NonNull final ShardDetector shardDetector) throws KinesisClientLibIOException {
@@ -365,7 +367,8 @@ public class HierarchicalShardSyncer {
      * @return List of new leases to create sorted by starting sequenceNumber of the corresponding shard
      */
     static List<Lease> determineNewLeasesToCreate(final LeaseSynchronizer leaseSynchronizer, final List<Shard> shards,
-            final List<Lease> currentLeases, final InitialPositionInStreamExtended initialPosition,final Set<String> inconsistentShardIds) {
+            final List<Lease> currentLeases, final InitialPositionInStreamExtended initialPosition,
+            final Set<String> inconsistentShardIds) {
         return determineNewLeasesToCreate(leaseSynchronizer, shards, currentLeases, initialPosition, inconsistentShardIds,
                 new MultiStreamArgs(false, null));
     }
@@ -499,11 +502,13 @@ public class HierarchicalShardSyncer {
                                 if (descendantParentShardIds.contains(parentShardId)
                                         && !initialPosition.getInitialPositionInStream()
                                         .equals(InitialPositionInStream.AT_TIMESTAMP)) {
-                                    log.info("Setting Lease '{}' checkpoint to 'TRIM_HORIZON'. Checkpoint was previously set to {}", lease.leaseKey(), lease.checkpoint());
+                                    log.info("Setting Lease '{}' checkpoint to 'TRIM_HORIZON'. Checkpoint was previously set to {}",
+                                            lease.leaseKey(), lease.checkpoint());
                                     lease.checkpoint(ExtendedSequenceNumber.TRIM_HORIZON);
                                 } else {
                                     final ExtendedSequenceNumber newCheckpoint = convertToCheckpoint(initialPosition);
-                                    log.info("Setting Lease '{}' checkpoint to '{}'. Checkpoint was previously set to {}", lease.leaseKey(), newCheckpoint, lease.checkpoint());
+                                    log.info("Setting Lease '{}' checkpoint to '{}'. Checkpoint was previously set to {}",
+                                            lease.leaseKey(), newCheckpoint, lease.checkpoint());
                                     lease.checkpoint(newCheckpoint);
                                 }
                             }
@@ -728,8 +733,8 @@ public class HierarchicalShardSyncer {
         @Override
         public int compare(final Lease lease1, final Lease lease2) {
             int result = 0;
-            final String shardId1 = shardIdFromLeaseDeducer.apply(lease1, multiStreamArgs);
+            final String shardId1 = SHARD_ID_FROM_LEASE_DEDUCER.apply(lease1, multiStreamArgs);
-            final String shardId2 = shardIdFromLeaseDeducer.apply(lease2, multiStreamArgs);
+            final String shardId2 = SHARD_ID_FROM_LEASE_DEDUCER.apply(lease2, multiStreamArgs);
             final Shard shard1 = shardIdToShardMap.get(shardId1);
             final Shard shard2 = shardIdToShardMap.get(shardId2);
 
@@ -802,7 +807,7 @@ public class HierarchicalShardSyncer {
             final Map<String, Shard> shardIdToShardMapOfAllKinesisShards = constructShardIdToShardMap(shards);
 
             currentLeases.stream().peek(lease -> log.debug("{} : Existing lease: {}", streamIdentifier, lease))
-                    .map(lease -> shardIdFromLeaseDeducer.apply(lease, multiStreamArgs))
+                    .map(lease -> SHARD_ID_FROM_LEASE_DEDUCER.apply(lease, multiStreamArgs))
                     .collect(Collectors.toSet());
 
             final List<Lease> newLeasesToCreate = getLeasesToCreateForOpenAndClosedShards(initialPosition, shards, multiStreamArgs, streamIdentifier);
@@ -908,7 +913,7 @@ public class HierarchicalShardSyncer {
                     .map(streamId -> streamId.serialize()).orElse("");
             final Set<String> shardIdsOfCurrentLeases = currentLeases.stream()
                     .peek(lease -> log.debug("{} : Existing lease: {}", streamIdentifier, lease))
-                    .map(lease -> shardIdFromLeaseDeducer.apply(lease, multiStreamArgs))
+                    .map(lease -> SHARD_ID_FROM_LEASE_DEDUCER.apply(lease, multiStreamArgs))
                     .collect(Collectors.toSet());
 
             final List<Shard> openShards = getOpenShards(shards, streamIdentifier);

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/LeaseCleanupManager.java

@@ -179,7 +179,7 @@ public class LeaseCleanupManager {
         try {
             if (cleanupLeasesUponShardCompletion && timeToCheckForCompletedShard) {
                 final Lease leaseFromDDB = leaseCoordinator.leaseRefresher().getLease(lease.leaseKey());
-                if(leaseFromDDB != null) {
+                if (leaseFromDDB != null) {
                     Set<String> childShardKeys = leaseFromDDB.childShardIds();
                     if (CollectionUtils.isNullOrEmpty(childShardKeys)) {
                         try {

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/LeaseManagementConfig.java

@@ -310,7 +310,7 @@ public class LeaseManagementConfig {
     private LeaseManagementFactory leaseManagementFactory;
 
     public HierarchicalShardSyncer hierarchicalShardSyncer() {
-        if(hierarchicalShardSyncer == null) {
+        if (hierarchicalShardSyncer == null) {
             hierarchicalShardSyncer = new HierarchicalShardSyncer();
         }
         return hierarchicalShardSyncer;
@@ -356,7 +356,7 @@ public class LeaseManagementConfig {
      * @return LeaseManagementFactory
      */
     public LeaseManagementFactory leaseManagementFactory(final LeaseSerializer leaseSerializer, boolean isMultiStreamingMode) {
-        if(leaseManagementFactory == null) {
+        if (leaseManagementFactory == null) {
             leaseManagementFactory = new DynamoDBLeaseManagementFactory(kinesisClient(),
                     dynamoDBClient(),
                     tableName(),

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/ShardSyncTask.java

@@ -37,7 +37,7 @@ import software.amazon.kinesis.metrics.MetricsUtil;
 @Slf4j
 @KinesisClientInternalApi
 public class ShardSyncTask implements ConsumerTask {
-    private final String SHARD_SYNC_TASK_OPERATION = "ShardSyncTask";
+    private static final String SHARD_SYNC_TASK_OPERATION = "ShardSyncTask";
 
     @NonNull
     private final ShardDetector shardDetector;

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/dynamodb/DynamoDBLeaseRefresher.java

@@ -187,7 +187,7 @@ public class DynamoDBLeaseRefresher implements LeaseRefresher {
     public boolean createLeaseTableIfNotExists(@NonNull final Long readCapacity, @NonNull final Long writeCapacity)
             throws ProvisionedThroughputException, DependencyException {
         final CreateTableRequest.Builder builder = createTableRequestBuilder();
-        if(BillingMode.PROVISIONED.equals(billingMode)) {
+        if (BillingMode.PROVISIONED.equals(billingMode)) {
             ProvisionedThroughput throughput = ProvisionedThroughput.builder().readCapacityUnits(readCapacity)
                 .writeCapacityUnits(writeCapacity).build();
             builder.provisionedThroughput(throughput);
@@ -467,7 +467,7 @@ public class DynamoDBLeaseRefresher implements LeaseRefresher {
         } catch (DynamoDbException | TimeoutException e) {
             throw convertAndRethrowExceptions("create", lease.leaseKey(), e);
         }
-        log.info("Created lease: {}",lease);
+        log.info("Created lease: {}", lease);
         return true;
     }
 

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/dynamodb/DynamoDBLeaseSerializer.java

@@ -89,7 +89,7 @@ public class DynamoDBLeaseSerializer implements LeaseSerializer {
             result.put(PENDING_CHECKPOINT_STATE_KEY, DynamoUtils.createAttributeValue(lease.checkpoint().subSequenceNumber()));
         }
 
-        if(lease.hashKeyRangeForLease() != null) {
+        if (lease.hashKeyRangeForLease() != null) {
             result.put(STARTING_HASH_KEY, DynamoUtils.createAttributeValue(lease.hashKeyRangeForLease().serializedStartingHashKey()));
             result.put(ENDING_HASH_KEY, DynamoUtils.createAttributeValue(lease.hashKeyRangeForLease().serializedEndingHashKey()));
         }
@@ -274,7 +274,7 @@ public class DynamoDBLeaseSerializer implements LeaseSerializer {
             result.put(CHILD_SHARD_IDS_KEY, putUpdate(DynamoUtils.createAttributeValue(lease.childShardIds())));
         }
 
-        if(lease.hashKeyRangeForLease() != null) {
+        if (lease.hashKeyRangeForLease() != null) {
             result.put(STARTING_HASH_KEY, putUpdate(DynamoUtils.createAttributeValue(lease.hashKeyRangeForLease().serializedStartingHashKey())));
             result.put(ENDING_HASH_KEY, putUpdate(DynamoUtils.createAttributeValue(lease.hashKeyRangeForLease().serializedEndingHashKey())));
         }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/exceptions/CustomerApplicationException.java

@@ -19,9 +19,9 @@ package software.amazon.kinesis.leases.exceptions;
  */
 public class CustomerApplicationException extends Exception {
 
-    public CustomerApplicationException(Throwable e) { super(e);}
+    public CustomerApplicationException(Throwable e) { super(e); }
 
-    public CustomerApplicationException(String message, Throwable e) { super(message, e);}
+    public CustomerApplicationException(String message, Throwable e) { super(message, e); }
 
-    public CustomerApplicationException(String message) { super(message);}
+    public CustomerApplicationException(String message) { super(message); }
 }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/lifecycle/ProcessTask.java

@@ -212,8 +212,10 @@ public class ProcessTask implements ConsumerTask {
         log.debug("Calling application processRecords() with {} records from {}", records.size(),
                 shardInfoId);
 
-        final ProcessRecordsInput processRecordsInput = ProcessRecordsInput.builder().records(records).cacheExitTime(input.cacheExitTime()).cacheEntryTime(input.cacheEntryTime())
+        final ProcessRecordsInput processRecordsInput = ProcessRecordsInput.builder().records(records)
-                .isAtShardEnd(input.isAtShardEnd()).checkpointer(recordProcessorCheckpointer).millisBehindLatest(input.millisBehindLatest()).build();
+                .cacheExitTime(input.cacheExitTime()).cacheEntryTime(input.cacheEntryTime())
+                .isAtShardEnd(input.isAtShardEnd()).checkpointer(recordProcessorCheckpointer)
+                .millisBehindLatest(input.millisBehindLatest()).build();
 
         final MetricsScope scope = MetricsUtil.createMetricsWithOperation(metricsFactory, PROCESS_TASK_OPERATION);
         shardInfo.streamIdentifierSerOpt()

amazon-kinesis-client/src/main/java/software/amazon/kinesis/lifecycle/ShardConsumerSubscriber.java

@@ -61,7 +61,7 @@ class ShardConsumerSubscriber implements Subscriber<RecordsRetrieved> {
     @Deprecated
     ShardConsumerSubscriber(RecordsPublisher recordsPublisher, ExecutorService executorService, int bufferSize,
                             ShardConsumer shardConsumer) {
-        this(recordsPublisher,executorService,bufferSize,shardConsumer, LifecycleConfig.DEFAULT_READ_TIMEOUTS_TO_IGNORE);
+        this(recordsPublisher, executorService, bufferSize, shardConsumer, LifecycleConfig.DEFAULT_READ_TIMEOUTS_TO_IGNORE);
     }
 
     ShardConsumerSubscriber(RecordsPublisher recordsPublisher, ExecutorService executorService, int bufferSize,
@@ -74,7 +74,6 @@ class ShardConsumerSubscriber implements Subscriber<RecordsRetrieved> {
         this.shardInfoId = ShardInfo.getLeaseKey(shardConsumer.shardInfo());
     }
 
-
     void startSubscriptions() {
         synchronized (lockObject) {
             // Setting the lastRequestTime to allow for health checks to restart subscriptions if they failed to

amazon-kinesis-client/src/main/java/software/amazon/kinesis/lifecycle/ShutdownTask.java

@@ -283,7 +283,7 @@ public class ShutdownTask implements ConsumerTask {
             }
         }
 
-        for(ChildShard childShard : childShards) {
+        for (ChildShard childShard : childShards) {
             final String leaseKey = ShardInfo.getLeaseKey(shardInfo, childShard.shardId());
             if (leaseRefresher.getLease(leaseKey) == null) {
                 log.debug("{} - Shard {} - Attempting to create lease for child shard {}", shardDetector.streamIdentifier(), shardInfo.shardId(), leaseKey);

amazon-kinesis-client/src/main/java/software/amazon/kinesis/metrics/CloudWatchMetricKey.java

@@ -20,9 +20,7 @@ import java.util.Objects;
 import software.amazon.awssdk.services.cloudwatch.model.Dimension;
 import software.amazon.awssdk.services.cloudwatch.model.MetricDatum;
 
-
+/**
-
-/*
  * A representation of a key of a MetricDatum. This class is useful when wanting to compare 
  * whether 2 keys have the same MetricDatum. This feature will be used in MetricAccumulatingQueue
  * where we aggregate metrics across multiple MetricScopes.
@@ -48,12 +46,15 @@ public class CloudWatchMetricKey {
 
     @Override
     public boolean equals(Object obj) {
-        if (this == obj)
+        if (this == obj) {
             return true;
-        if (obj == null)
+        }
+        if (obj == null) {
             return false;
-        if (getClass() != obj.getClass())
+        }
+        if (getClass() != obj.getClass()) {
             return false;
+        }
         CloudWatchMetricKey other = (CloudWatchMetricKey) obj;
         return Objects.equals(other.dimensions, dimensions) && Objects.equals(other.metricName, metricName);
     }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/metrics/MetricDatumWithKey.java

@@ -36,7 +36,6 @@ import java.util.Objects;
  * 
  *        MetricDatumWithKey<SampleMetricKey> sampleDatumWithKey = new MetricDatumWithKey<SampleMetricKey>(new
  *        SampleMetricKey(System.currentTimeMillis()), datum)
- *        
  */
 @AllArgsConstructor
 @Setter
@@ -59,12 +58,15 @@ public class MetricDatumWithKey<KeyType> {
 
     @Override
     public boolean equals(Object obj) {
-        if (this == obj)
+        if (this == obj) {
             return true;
-        if (obj == null)
+        }
+        if (obj == null) {
             return false;
-        if (getClass() != obj.getClass())
+        }
+        if (getClass() != obj.getClass()) {
             return false;
+        }
         MetricDatumWithKey<?> other = (MetricDatumWithKey<?>) obj;
         return Objects.equals(other.key, key) && Objects.equals(other.datum, datum);
     }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/fanout/FanOutRecordsPublisher.java

@@ -192,7 +192,7 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
             // Take action based on the time spent by the event in queue.
             takeDelayedDeliveryActionIfRequired(streamAndShardId, recordsRetrievedContext.getEnqueueTimestamp(), log);
             // Update current sequence number for the successfully delivered event.
-            currentSequenceNumber = ((FanoutRecordsRetrieved)recordsRetrieved).continuationSequenceNumber();
+            currentSequenceNumber = ((FanoutRecordsRetrieved) recordsRetrieved).continuationSequenceNumber();
             // Update the triggering flow for post scheduling upstream request.
             flowToBeReturned = recordsRetrievedContext.getRecordFlow();
             // Try scheduling the next event in the queue or execute the subscription shutdown action.
@@ -206,7 +206,8 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
             if (flow != null && recordsDeliveryAck.batchUniqueIdentifier().getFlowIdentifier()
                     .equals(flow.getSubscribeToShardId())) {
                 log.error(
-                        "{}: Received unexpected ack for the active subscription {}. Throwing.  ", streamAndShardId, recordsDeliveryAck.batchUniqueIdentifier().getFlowIdentifier());
+                        "{}: Received unexpected ack for the active subscription {}. Throwing.",
+                        streamAndShardId, recordsDeliveryAck.batchUniqueIdentifier().getFlowIdentifier());
                 throw new IllegalStateException("Unexpected ack for the active subscription");
             }
             // Otherwise publisher received a stale ack.
@@ -315,7 +316,7 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
         synchronized (lockObject) {
 
             if (!hasValidSubscriber()) {
-                if(hasValidFlow()) {
+                if (hasValidFlow()) {
                     log.warn(
                             "{}: [SubscriptionLifetime] - (FanOutRecordsPublisher#errorOccurred) @ {} id: {} -- Subscriber is null." +
                                     " Last successful request details -- {}", streamAndShardId, flow.connectionStartedAt,
@@ -335,7 +336,8 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
                 if (flow != null) {
                     String logMessage = String.format(
                             "%s: [SubscriptionLifetime] - (FanOutRecordsPublisher#errorOccurred) @ %s id: %s -- %s." +
-                                    " Last successful request details -- %s", streamAndShardId, flow.connectionStartedAt, flow.subscribeToShardId, category.throwableTypeString, lastSuccessfulRequestDetails);
+                                    " Last successful request details -- %s", streamAndShardId, flow.connectionStartedAt,
+                            flow.subscribeToShardId, category.throwableTypeString, lastSuccessfulRequestDetails);
                     switch (category.throwableType) {
                     case READ_TIMEOUT:
                         log.debug(logMessage, propagationThrowable);
@@ -778,7 +780,11 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
                     executeExceptionOccurred(throwable);
                 } else {
                     final SubscriptionShutdownEvent subscriptionShutdownEvent = new SubscriptionShutdownEvent(
-                            () -> {parent.recordsDeliveryQueue.poll(); executeExceptionOccurred(throwable);}, "onError", throwable);
+                            () -> {
+                                parent.recordsDeliveryQueue.poll();
+                                executeExceptionOccurred(throwable);
+                                },
+                            "onError", throwable);
                     tryEnqueueSubscriptionShutdownEvent(subscriptionShutdownEvent);
                 }
             }
@@ -786,7 +792,6 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
 
         private void executeExceptionOccurred(Throwable throwable) {
             synchronized (parent.lockObject) {
-
                 log.debug("{}: [SubscriptionLifetime]: (RecordFlow#exceptionOccurred) @ {} id: {} -- {}: {}",
                         parent.streamAndShardId, connectionStartedAt, subscribeToShardId, throwable.getClass().getName(),
                         throwable.getMessage());
@@ -817,7 +822,11 @@ public class FanOutRecordsPublisher implements RecordsPublisher {
                     executeComplete();
                 } else {
                     final SubscriptionShutdownEvent subscriptionShutdownEvent = new SubscriptionShutdownEvent(
-                            () -> {parent.recordsDeliveryQueue.poll(); executeComplete();}, "onComplete");
+                            () -> {
+                                parent.recordsDeliveryQueue.poll();
+                                executeComplete();
+                                },
+                            "onComplete");
                     tryEnqueueSubscriptionShutdownEvent(subscriptionShutdownEvent);
                 }
             }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/fanout/FanOutRetrievalFactory.java

@@ -54,7 +54,7 @@ public class FanOutRetrievalFactory implements RetrievalFactory {
             final StreamConfig streamConfig,
             final MetricsFactory metricsFactory) {
         final Optional<String> streamIdentifierStr = shardInfo.streamIdentifierSerOpt();
-        if(streamIdentifierStr.isPresent()) {
+        if (streamIdentifierStr.isPresent()) {
             final StreamIdentifier streamIdentifier = StreamIdentifier.multiStreamInstance(streamIdentifierStr.get());
             return new FanOutRecordsPublisher(kinesisClient, shardInfo.shardId(),
                     getOrCreateConsumerArn(streamIdentifier, streamConfig.consumerArn()),

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/polling/PollingConfig.java

@@ -137,7 +137,7 @@ public class PollingConfig implements RetrievalSpecificConfig {
     @Override
     public RetrievalFactory retrievalFactory() {
         // Prioritize the PollingConfig specified value if its updated.
-        if(usePollingConfigIdleTimeValue) {
+        if (usePollingConfigIdleTimeValue) {
             recordsFetcherFactory.idleMillisBetweenCalls(idleTimeBetweenReadsInMillis);
         }
         return new SynchronousBlockingRetrievalFactory(streamName(), kinesisClient(), recordsFetcherFactory,

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/polling/PrefetchRecordsPublisher.java

@@ -327,7 +327,7 @@ public class PrefetchRecordsPublisher implements RecordsPublisher {
         }
         resetLock.writeLock().lock();
         try {
-            publisherSession.reset((PrefetchRecordsRetrieved)recordsRetrieved);
+            publisherSession.reset((PrefetchRecordsRetrieved) recordsRetrieved);
             wasReset = true;
         } finally {
             resetLock.writeLock().unlock();
@@ -555,7 +555,7 @@ public class PrefetchRecordsPublisher implements RecordsPublisher {
                 return;
             }
             // Add a sleep if lastSuccessfulCall is still null but this is not the first try to avoid retry storm
-            if(lastSuccessfulCall == null) {
+            if (lastSuccessfulCall == null) {
                 Thread.sleep(idleMillisBetweenCalls);
                 return;
             }