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EventHubs integration part 2 - spotbugs (#3105)
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This PR includes fix for SpotBugs and also corrects some CheckStyle errors left from previous PR (EventHubs integration part 1 #3100):

* fix<SpotBugs>: all 6 P1 bugs

* fix<SpotBugs>: supression and refactor

* fix<SpotBugs>: update spotbugs-exclude with comment for EH

* refactor(SpotBugs): import static

* fix<checkstyle>: access can be package-private

* fix<checkstyle>: modifier public is redundant for interface methods

* fix<checkstyle>: modifier public is redundant for inner class of interface and modifier static is redundant for inner class of interface and inner enum

* fix<checkstyle>: modifier final is redundant for final class

* fix(stylecheck): EmptyBlock

* fix(CheckStyle): EmptyBlock and ConstantName

* fix(CheckStyle): MethodName

* fix(CheckStyle): ConstantName

* fix(CheckStyle): checkstyle suppressions file

* fix(CheckStyle): refactor Inner Assignment

* fix(CheckStyle): refactor Empty Block

* fix(CheckStyle):  update Check Style Suppressions

* fix(CheckStyle): after update to checkstyle 8.18, final modifier modifier

* docs(CheckStyle): clarity the comment, no functional things involved
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@mssfang
mssfang authored Mar 21, 2019
1 parent f657138 commit 6382d7f
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Showing 41 changed files with 212 additions and 198 deletions.
8 changes: 8 additions & 0 deletions eng/code-quality-reports/src/main/resources/spotbugs/spotbugs-exclude.xml
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Expand Up @@ -47,6 +47,14 @@
<Bug pattern="UUF_UNUSED_PUBLIC_OR_PROTECTED_FIELD"/>
</Match>

<!-- Public field already exists in the public API surface area even
though it should be final. -->
<Match>
<Class name="com.microsoft.azure.eventhubs.impl.EventHubClientImpl"/>
<Field name="USER_AGENT"/>
<Bug pattern="MS_SHOULD_BE_FINAL"/>
</Match>

<!-- These KeyVault classes are publicly released APIs that intentionally return null rather
than an empty array. -->
<Match>
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4 changes: 1 addition & 3 deletions .../main/java/com/microsoft/azure/eventprocessorhost/AzureStorageCheckpointLeaseManager.java
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Expand Up @@ -525,9 +525,7 @@ private boolean renewLeaseInternal(CompleteLease lease) throws StorageException
leaseBlob.renewLease(AccessCondition.generateLeaseCondition(azLease.getToken()), this.renewRequestOptions, null);
result = true;
} catch (StorageException se) {
if (wasLeaseLost(se, azLease.getPartitionId())) {
// leave result as false
} else {
if (!wasLeaseLost(se, azLease.getPartitionId())) {
throw se;
}
}
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10 changes: 5 additions & 5 deletions ...venthubs-eph/src/main/java/com/microsoft/azure/eventprocessorhost/EventProcessorHost.java
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Expand Up @@ -27,7 +27,7 @@
*/
public final class EventProcessorHost {
private static final Logger TRACE_LOGGER = LoggerFactory.getLogger(EventProcessorHost.class);
private static final Object uuidSynchronizer = new Object();
private static final Object UUID_SYNCHRONIZER = new Object();
// weOwnExecutor exists to support user-supplied thread pools.
private final boolean weOwnExecutor;
private final ScheduledExecutorService executorService;
Expand Down Expand Up @@ -330,7 +330,7 @@ public static String createHostName(String prefix) {
* @return A string UUID with dashes but no curly brackets.
*/
public static String safeCreateUUID() {
synchronized (EventProcessorHost.uuidSynchronizer) {
synchronized (EventProcessorHost.UUID_SYNCHRONIZER) {
final UUID newUuid = UUID.randomUUID();
return newUuid.toString();
}
Expand Down Expand Up @@ -530,15 +530,15 @@ public CompletableFuture<Void> unregisterEventProcessor() {
}

static class EventProcessorHostThreadPoolFactory implements ThreadFactory {
private static final AtomicInteger poolNumber = new AtomicInteger(1);
private static final AtomicInteger POOL_NUMBER = new AtomicInteger(1);
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final ThreadGroup group;
private final String namePrefix;
private final String hostName;
private final String entityName;
private final String consumerGroupName;

public EventProcessorHostThreadPoolFactory(
EventProcessorHostThreadPoolFactory(
String hostName,
String entityName,
String consumerGroupName) {
Expand All @@ -561,7 +561,7 @@ public Thread newThread(Runnable r) {

private String getNamePrefix() {
return String.format("[%s|%s|%s]-%s-",
this.entityName, this.consumerGroupName, this.hostName, poolNumber.getAndIncrement());
this.entityName, this.consumerGroupName, this.hostName, POOL_NUMBER.getAndIncrement());
}

static class ThreadUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
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14 changes: 7 additions & 7 deletions ...venthubs-eph/src/main/java/com/microsoft/azure/eventprocessorhost/ICheckpointManager.java
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Expand Up @@ -27,21 +27,21 @@ public interface ICheckpointManager {
*
* @return CompletableFuture {@literal ->} true if it exists, false if not
*/
public CompletableFuture<Boolean> checkpointStoreExists();
CompletableFuture<Boolean> checkpointStoreExists();

/***
* Create the checkpoint store if it doesn't exist. Do nothing if it does exist.
*
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> createCheckpointStoreIfNotExists();
CompletableFuture<Void> createCheckpointStoreIfNotExists();

/**
* Deletes the checkpoint store.
*
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> deleteCheckpointStore();
CompletableFuture<Void> deleteCheckpointStore();

/***
* Get the checkpoint data associated with the given partition. Could return null if no checkpoint has
Expand All @@ -51,7 +51,7 @@ public interface ICheckpointManager {
*
* @return CompletableFuture {@literal ->} checkpoint info, or null. Completes exceptionally on error.
*/
public CompletableFuture<Checkpoint> getCheckpoint(String partitionId);
CompletableFuture<Checkpoint> getCheckpoint(String partitionId);

/***
* Creates the checkpoint HOLDERs for the given partitions. Does nothing for any checkpoint HOLDERs
Expand All @@ -67,7 +67,7 @@ public interface ICheckpointManager {
* @param partitionIds List of partitions to create checkpoint HOLDERs for.
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> createAllCheckpointsIfNotExists(List<String> partitionIds);
CompletableFuture<Void> createAllCheckpointsIfNotExists(List<String> partitionIds);

/***
* Update the checkpoint in the store with the offset/sequenceNumber in the provided checkpoint.
Expand All @@ -81,7 +81,7 @@ public interface ICheckpointManager {
* @param checkpoint offset/sequenceNumber and partition id to update the store with.
* @return CompletableFuture {@literal ->} null on success. Completes exceptionally on error.
*/
public CompletableFuture<Void> updateCheckpoint(CompleteLease lease, Checkpoint checkpoint);
CompletableFuture<Void> updateCheckpoint(CompleteLease lease, Checkpoint checkpoint);

/***
* Delete the stored checkpoint data for the given partition. If there is no stored checkpoint for the
Expand All @@ -91,5 +91,5 @@ public interface ICheckpointManager {
* @param partitionId id of partition to delete checkpoint from store
* @return CompletableFuture {@literal ->} null on success. Completes exceptionally on error.
*/
public CompletableFuture<Void> deleteCheckpoint(String partitionId);
CompletableFuture<Void> deleteCheckpoint(String partitionId);
}
8 changes: 4 additions & 4 deletions ...e-eventhubs-eph/src/main/java/com/microsoft/azure/eventprocessorhost/IEventProcessor.java
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Expand Up @@ -31,7 +31,7 @@ public interface IEventProcessor {
* @param context Information about the partition that this event processor will process events from.
* @throws Exception to indicate failure.
*/
public void onOpen(PartitionContext context) throws Exception;
void onOpen(PartitionContext context) throws Exception;

/**
* Called by processor host to indicate that the event processor is being stopped.
Expand All @@ -43,7 +43,7 @@ public interface IEventProcessor {
* @param reason Reason why the event processor is being stopped.
* @throws Exception to indicate failure.
*/
public void onClose(PartitionContext context, CloseReason reason) throws Exception;
void onClose(PartitionContext context, CloseReason reason) throws Exception;

/**
* Called by the processor host when a batch of events has arrived.
Expand All @@ -58,7 +58,7 @@ public interface IEventProcessor {
* @param events The events to be processed. May be empty.
* @throws Exception to indicate failure.
*/
public void onEvents(PartitionContext context, Iterable<EventData> events) throws Exception;
void onEvents(PartitionContext context, Iterable<EventData> events) throws Exception;

/**
* Called when the underlying client experiences an error while receiving. EventProcessorHost will take
Expand All @@ -68,5 +68,5 @@ public interface IEventProcessor {
* @param context Information about the partition.
* @param error The error that occured.
*/
public void onError(PartitionContext context, Throwable error);
void onError(PartitionContext context, Throwable error);
}
2 changes: 1 addition & 1 deletion ...hubs-eph/src/main/java/com/microsoft/azure/eventprocessorhost/IEventProcessorFactory.java
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Expand Up @@ -22,5 +22,5 @@ public interface IEventProcessorFactory<T extends IEventProcessor> {
* @throws Exception to indicate failure.
* @return The event processor object.
*/
public T createEventProcessor(PartitionContext context) throws Exception;
T createEventProcessor(PartitionContext context) throws Exception;
}
24 changes: 12 additions & 12 deletions ...ure-eventhubs-eph/src/main/java/com/microsoft/azure/eventprocessorhost/ILeaseManager.java
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Expand Up @@ -25,7 +25,7 @@ public interface ILeaseManager {
*
* @return Duration of a lease before it expires unless renewed, specified in milliseconds.
*/
public int getLeaseDurationInMilliseconds();
int getLeaseDurationInMilliseconds();

/**
* Does the lease store exist?
Expand All @@ -35,29 +35,29 @@ public interface ILeaseManager {
*
* @return CompletableFuture {@literal ->} true if it exists, false if not
*/
public CompletableFuture<Boolean> leaseStoreExists();
CompletableFuture<Boolean> leaseStoreExists();

/**
* Create the lease store if it does not exist, do nothing if it does exist.
*
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> createLeaseStoreIfNotExists();
CompletableFuture<Void> createLeaseStoreIfNotExists();

/**
* Deletes the lease store.
*
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> deleteLeaseStore();
CompletableFuture<Void> deleteLeaseStore();

/**
* Returns the lease info for the given partition..
*
* @param partitionId Get the lease info for this partition.
* @return CompletableFuture {@literal ->} Lease, completes exceptionally on error.
*/
public CompletableFuture<CompleteLease> getLease(String partitionId);
CompletableFuture<CompleteLease> getLease(String partitionId);

/**
* Returns lightweight BaseLease for all leases, which includes name of owning host and whether lease
Expand All @@ -67,7 +67,7 @@ public interface ILeaseManager {
*
* @return CompletableFuture {@literal ->} list of BaseLease, completes exceptionally on error.
*/
public CompletableFuture<List<BaseLease>> getAllLeases();
CompletableFuture<List<BaseLease>> getAllLeases();


/**
Expand All @@ -77,7 +77,7 @@ public interface ILeaseManager {
* @param partitionIds ids of partitions to create lease info for
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error
*/
public CompletableFuture<Void> createAllLeasesIfNotExists(List<String> partitionIds);
CompletableFuture<Void> createAllLeasesIfNotExists(List<String> partitionIds);

/**
* Delete the lease info for a partition from the store. If there is no stored lease for the given partition,
Expand All @@ -86,7 +86,7 @@ public interface ILeaseManager {
* @param lease the currently existing lease info for the partition
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> deleteLease(CompleteLease lease);
CompletableFuture<Void> deleteLease(CompleteLease lease);

/**
* Acquire the lease on the desired partition for this EventProcessorHost.
Expand All @@ -103,7 +103,7 @@ public interface ILeaseManager {
* @param lease Lease info for the desired partition
* @return CompletableFuture {@literal ->} true if the lease was acquired, false if not, completes exceptionally on error.
*/
public CompletableFuture<Boolean> acquireLease(CompleteLease lease);
CompletableFuture<Boolean> acquireLease(CompleteLease lease);

/**
* Renew a lease currently held by this host instance.
Expand All @@ -116,7 +116,7 @@ public interface ILeaseManager {
* @param lease Lease to be renewed
* @return true if the lease was renewed, false as described above, completes exceptionally on error.
*/
public CompletableFuture<Boolean> renewLease(CompleteLease lease);
CompletableFuture<Boolean> renewLease(CompleteLease lease);

/**
* Give up a lease currently held by this host.
Expand All @@ -127,7 +127,7 @@ public interface ILeaseManager {
* @param lease Lease to be given up
* @return CompletableFuture {@literal ->} null on success, completes exceptionally on error.
*/
public CompletableFuture<Void> releaseLease(CompleteLease lease);
CompletableFuture<Void> releaseLease(CompleteLease lease);

/**
* Update the store with the information in the provided lease.
Expand All @@ -139,5 +139,5 @@ public interface ILeaseManager {
* @param lease New lease info to be stored
* @return true if the update was successful, false if lease was lost and could not be updated, completes exceptionally on error.
*/
public CompletableFuture<Boolean> updateLease(CompleteLease lease);
CompletableFuture<Boolean> updateLease(CompleteLease lease);
}
18 changes: 9 additions & 9 deletions ...s-eph/src/main/java/com/microsoft/azure/eventprocessorhost/InMemoryCheckpointManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -45,29 +45,29 @@ public void initialize(HostContext hostContext) {

@Override
public CompletableFuture<Boolean> checkpointStoreExists() {
boolean exists = InMemoryCheckpointStore.singleton.existsMap();
boolean exists = InMemoryCheckpointStore.SINGLETON.existsMap();
TRACE_LOGGER.debug(this.hostContext.withHost("checkpointStoreExists() " + exists));
return CompletableFuture.completedFuture(exists);
}

@Override
public CompletableFuture<Void> createCheckpointStoreIfNotExists() {
TRACE_LOGGER.debug(this.hostContext.withHost("createCheckpointStoreIfNotExists()"));
InMemoryCheckpointStore.singleton.initializeMap();
InMemoryCheckpointStore.SINGLETON.initializeMap();
return CompletableFuture.completedFuture(null);
}

@Override
public CompletableFuture<Void> deleteCheckpointStore() {
TRACE_LOGGER.debug(this.hostContext.withHost("deleteCheckpointStore()"));
InMemoryCheckpointStore.singleton.deleteMap();
InMemoryCheckpointStore.SINGLETON.deleteMap();
return CompletableFuture.completedFuture(null);
}

@Override
public CompletableFuture<Checkpoint> getCheckpoint(String partitionId) {
Checkpoint returnCheckpoint = null;
Checkpoint checkpointInStore = InMemoryCheckpointStore.singleton.getCheckpoint(partitionId);
Checkpoint checkpointInStore = InMemoryCheckpointStore.SINGLETON.getCheckpoint(partitionId);
if (checkpointInStore == null) {
TRACE_LOGGER.warn(this.hostContext.withHostAndPartition(partitionId,
"getCheckpoint() no existing Checkpoint"));
Expand All @@ -87,7 +87,7 @@ public CompletableFuture<Checkpoint> getCheckpoint(String partitionId) {
@Override
public CompletableFuture<Void> createAllCheckpointsIfNotExists(List<String> partitionIds) {
for (String id : partitionIds) {
Checkpoint checkpointInStore = InMemoryCheckpointStore.singleton.getCheckpoint(id);
Checkpoint checkpointInStore = InMemoryCheckpointStore.SINGLETON.getCheckpoint(id);
if (checkpointInStore != null) {
TRACE_LOGGER.debug(this.hostContext.withHostAndPartition(id,
"createCheckpointIfNotExists() found existing checkpoint, OK"));
Expand All @@ -99,7 +99,7 @@ public CompletableFuture<Void> createAllCheckpointsIfNotExists(List<String> part
// and put it in the store, but the values are set to indicate that it is not initialized.
newStoreCheckpoint.setOffset(null);
newStoreCheckpoint.setSequenceNumber(-1);
InMemoryCheckpointStore.singleton.setOrReplaceCheckpoint(newStoreCheckpoint);
InMemoryCheckpointStore.SINGLETON.setOrReplaceCheckpoint(newStoreCheckpoint);
}
}
return CompletableFuture.completedFuture(null);
Expand All @@ -109,7 +109,7 @@ public CompletableFuture<Void> createAllCheckpointsIfNotExists(List<String> part
public CompletableFuture<Void> updateCheckpoint(CompleteLease lease, Checkpoint checkpoint) {
TRACE_LOGGER.debug(this.hostContext.withHostAndPartition(checkpoint.getPartitionId(),
"updateCheckpoint() " + checkpoint.getOffset() + "//" + checkpoint.getSequenceNumber()));
Checkpoint checkpointInStore = InMemoryCheckpointStore.singleton.getCheckpoint(checkpoint.getPartitionId());
Checkpoint checkpointInStore = InMemoryCheckpointStore.SINGLETON.getCheckpoint(checkpoint.getPartitionId());
if (checkpointInStore != null) {
checkpointInStore.setOffset(checkpoint.getOffset());
checkpointInStore.setSequenceNumber(checkpoint.getSequenceNumber());
Expand All @@ -123,13 +123,13 @@ public CompletableFuture<Void> updateCheckpoint(CompleteLease lease, Checkpoint
@Override
public CompletableFuture<Void> deleteCheckpoint(String partitionId) {
TRACE_LOGGER.debug(this.hostContext.withHostAndPartition(partitionId, "deleteCheckpoint()"));
InMemoryCheckpointStore.singleton.removeCheckpoint(partitionId);
InMemoryCheckpointStore.SINGLETON.removeCheckpoint(partitionId);
return CompletableFuture.completedFuture(null);
}


private static class InMemoryCheckpointStore {
static final InMemoryCheckpointStore singleton = new InMemoryCheckpointStore();
static final InMemoryCheckpointStore SINGLETON = new InMemoryCheckpointStore();

private ConcurrentHashMap<String, Checkpoint> inMemoryCheckpointsPrivate = null;

Expand Down
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