Package org.springframework.cloud.stream.binder.kafka.utils

Interface DlqPartitionFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface DlqPartitionFunction

A TriFunction that takes a consumer group, consumer record, and throwable and returns which partition to publish to the dead letter topic. Returning null means Kafka will choose the partition.

Since:

3.0

Author:

Gary Russell

Field Summary

Fields

Modifier and Type	Field	Description
static DlqPartitionFunction	ORIGINAL_PARTITION	Returns the same partition as the original recor.
static DlqPartitionFunction	PARTITION_ZERO	Returns 0.

Method Summary

Modifier and Type	Method	Description
Integer	apply(String group, org.apache.kafka.clients.consumer.ConsumerRecord<?,?> record, Throwable throwable)	Apply the function.
static DlqPartitionFunction	determineFallbackFunction(Integer dlqPartitions, org.apache.commons.logging.Log logger)	Determine the fallback function to use based on the dlq partition count if no DlqPartitionFunction bean is provided.

Field Detail

ORIGINAL_PARTITION

static final DlqPartitionFunction ORIGINAL_PARTITION

Returns the same partition as the original recor.

PARTITION_ZERO

static final DlqPartitionFunction PARTITION_ZERO

Returns 0.

Method Detail

apply

@Nullable
Integer apply(String group,
              org.apache.kafka.clients.consumer.ConsumerRecord<?,?> record,
              Throwable throwable)

Apply the function.

Parameters:

group - the consumer group.

record - the consumer record.

throwable - the exception.

Returns:

the DLQ partition, or null.

determineFallbackFunction

static DlqPartitionFunction determineFallbackFunction(@Nullable
                                                      Integer dlqPartitions,
                                                      org.apache.commons.logging.Log logger)

Determine the fallback function to use based on the dlq partition count if no DlqPartitionFunction bean is provided.

Parameters:

dlqPartitions - the partition count.

logger - the logger.

Returns:

the fallback.