Package io.smallrye.reactive.messaging.kafka.commit

Class KafkaCheckpointCommit

java.lang.Object

io.smallrye.reactive.messaging.kafka.commit.ContextHolder

io.smallrye.reactive.messaging.kafka.commit.KafkaCheckpointCommit

All Implemented Interfaces:

KafkaCommitHandler

@Experimental("Experimental API")
public class KafkaCheckpointCommit
extends ContextHolder
implements KafkaCommitHandler

Commit handler for checkpointing processing state persisted in a state store

Instead of committing topic-partition offsets back to Kafka, checkpointing commit handlers persist and restore offsets on an external store. It associates a ProcessingState with a topic-partition offset, and lets the processing resume from the checkpointed state.

This abstract implementation holds a local map of ProcessingState per topic-partition, and ensures it is accessed on the captured Vert.x context.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	KafkaCheckpointCommit.CheckpointState<T>
static class	KafkaCheckpointCommit.Factory
static class	KafkaCheckpointCommit.LastStateStoredTooLongAgoException

Nested classes/interfaces inherited from interface io.smallrye.reactive.messaging.kafka.commit.KafkaCommitHandler

KafkaCommitHandler.Strategy

Field Summary

Fields inherited from class io.smallrye.reactive.messaging.kafka.commit.ContextHolder

context, vertx

Constructor Summary

Constructors

Constructor	Description
KafkaCheckpointCommit(io.vertx.mutiny.core.Vertx vertx, KafkaConsumer<?,?> consumer, CheckpointStateStore stateStore, BiConsumer<Throwable,Boolean> reportFailure, int autoCommitInterval, int unsynchedStateMaxAge, int defaultTimeout)

Method Summary

Modifier and Type	Method	Description
<K, V> io.smallrye.mutiny.Uni<Void>	handle(IncomingKafkaRecord<K,V> record)	Called on Vert.x event loop
void	partitionsAssigned(Collection<org.apache.kafka.common.TopicPartition> partitions)	Called on partitions assigned on Kafka rebalance listener
void	partitionsRevoked(Collection<org.apache.kafka.common.TopicPartition> partitions)	Called on partitions revokd on Kafka rebalance listener
<K, V> io.smallrye.mutiny.Uni<IncomingKafkaRecord<K,V>>	received(IncomingKafkaRecord<K,V> record)	Called on Vert.x event loop
void	terminate(boolean graceful)	Called on channel shutdown

Methods inherited from class io.smallrye.reactive.messaging.kafka.commit.ContextHolder

capture, capture, getContext, getTimeoutInMillis, runOnContext, runOnContextAndAwait

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

KafkaCheckpointCommit

public KafkaCheckpointCommit(io.vertx.mutiny.core.Vertx vertx,
 KafkaConsumer<?,?> consumer,
 CheckpointStateStore stateStore,
 BiConsumer<Throwable,Boolean> reportFailure,
 int autoCommitInterval,
 int unsynchedStateMaxAge,
 int defaultTimeout)

Method Details

received

public <K,
V>
io.smallrye.mutiny.Uni<IncomingKafkaRecord<K,V>> received(IncomingKafkaRecord<K,V> record)

Called on Vert.x event loop

Specified by:

received in interface KafkaCommitHandler

Type Parameters:

K - type of record key

V - type of record value

Parameters:

record - incoming Kafka record

Returns:

the Uni yielding the received record

handle

public <K,
V> io.smallrye.mutiny.Uni<Void> handle(IncomingKafkaRecord<K,V> record)

Called on Vert.x event loop

Specified by:

handle in interface KafkaCommitHandler

Type Parameters:

K - type of record key

V - type of record value

Parameters:

record - incoming Kafka record

Returns:

a completion stage completed when the message is acknowledged.

terminate

public void terminate(boolean graceful)

Description copied from interface: KafkaCommitHandler

Called on channel shutdown

Specified by:

terminate in interface KafkaCommitHandler

Parameters:

graceful - true if it is a graceful shutdown

partitionsAssigned

public void partitionsAssigned(Collection<org.apache.kafka.common.TopicPartition> partitions)

Description copied from interface: KafkaCommitHandler

Called on partitions assigned on Kafka rebalance listener

Specified by:

partitionsAssigned in interface KafkaCommitHandler

Parameters:

partitions - assigned partitions

partitionsRevoked

public void partitionsRevoked(Collection<org.apache.kafka.common.TopicPartition> partitions)

Description copied from interface: KafkaCommitHandler

Called on partitions revokd on Kafka rebalance listener

Specified by:

partitionsRevoked in interface KafkaCommitHandler

Parameters:

partitions - revoked partitions