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For the latest stable version, please use Spring for Apache Kafka 3.3.1! |
Accessing Delivery Attempts
To access blocking and non-blocking delivery attempts, add these headers to your @KafkaListener method signature:
@Header(KafkaHeaders.DELIVERY_ATTEMPT) int blockingAttempts,
@Header(name = RetryTopicHeaders.DEFAULT_HEADER_ATTEMPTS, required = false) Integer nonBlockingAttemptsBlocking delivery attempts are only provided if you set ContainerProperties's deliveryAttemptHeader to true.
Note that the non blocking attempts will be null for the initial delivery.
Starting with version 3.0.10, a convenient KafkaMessageHeaderAccessor is provided to allow simpler access to these headers; the accessor can be provided as a parameter for the listener method:
@RetryableTopic(backoff = @Backoff(...))
@KafkaListener(id = "dh1", topics = "dh1")
void listen(Thing thing, KafkaMessageHeaderAccessor accessor) {
...
}
Use accessor.getBlockingRetryDeliveryAttempt() and accessor.getNonBlockingRetryDeliveryAttempt() to get the values.
The accessor will throw an IllegalStateException if blocking retries are not enabled; for non-blocking retries, the accessor returns 1 for the initial delivery.
