org.apache.storm.kafka.spout

Interface RecordTranslator<K,V>

All Superinterfaces:

Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>>, Serializable

All Known Implementing Classes:

ByTopicRecordTranslator, DefaultRecordTranslator, OnlyValueRecordTranslator, RecordTranslatorSchemeAdapter, SimpleRecordTranslator

public interface RecordTranslator<K,V>
extends Serializable, Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>>

Translate a ConsumerRecord to a tuple.

Field Summary

Fields

Modifier and Type	Field and Description
static List<String>	DEFAULT_STREAM

Method Summary

Modifier and Type	Method and Description
List<Object>	apply(org.apache.kafka.clients.consumer.ConsumerRecord<K,V> record) Translate the ConsumerRecord into a list of objects that can be emitted.
Fields	getFieldsFor(String stream) Get the fields associated with a stream.
default List<String>	streams() Get the list of streams this translator will handle.

Field Detail

DEFAULT_STREAM

static final List<String> DEFAULT_STREAM

Method Detail

apply

List<Object> apply(org.apache.kafka.clients.consumer.ConsumerRecord<K,V> record)

Translate the ConsumerRecord into a list of objects that can be emitted.

Specified by:

apply in interface Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>>

Parameters:

record - the record to translate

Returns:

the objects in the tuple. Return a KafkaTuple if you want to route the tuple to a non-default stream. Return null to discard an invalid ConsumerRecord if KafkaSpoutConfig.Builder.setEmitNullTuples(boolean) is set to false.

getFieldsFor

Fields getFieldsFor(String stream)

Get the fields associated with a stream. The streams passed in are returned by the streams() method.

Parameters:

stream - the stream the fields are for

Returns:

the fields for that stream.

streams

default List<String> streams()

Get the list of streams this translator will handle.

Returns:

the list of streams that this will handle.