org.apache.storm.kafka.spout

Class SimpleRecordTranslator<K,V>

java.lang.Object

org.apache.storm.kafka.spout.SimpleRecordTranslator<K,V>

All Implemented Interfaces:

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

public class SimpleRecordTranslator<K,V>
extends Object
implements RecordTranslator<K,V>

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.storm.kafka.spout.RecordTranslator

DEFAULT_STREAM

Constructor Summary

Constructors

Constructor and Description
SimpleRecordTranslator(Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>> func, Fields fields)
SimpleRecordTranslator(Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>> func, Fields fields, String stream) Creates a SimpleRecordTranslator.

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.
List<String>	streams() Get the list of streams this translator will handle.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleRecordTranslator

public SimpleRecordTranslator(Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>> func,
                              Fields fields)

SimpleRecordTranslator

public SimpleRecordTranslator(Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>> func,
                              Fields fields,
                              String stream)

Creates a SimpleRecordTranslator.

Parameters:

func - The mapping function responsible for translating a Kafka record to a Tuple

fields - The fields tuples constructed by this translator will contain

stream - The stream tuples constructed by this translator will target

Method Detail

apply

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

Description copied from interface: RecordTranslator

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>>

Specified by:

apply in interface RecordTranslator<K,V>

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

public Fields getFieldsFor(String stream)

Description copied from interface: RecordTranslator

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

Specified by:

getFieldsFor in interface RecordTranslator<K,V>

Parameters:

stream - the stream the fields are for

Returns:

the fields for that stream.

streams

public List<String> streams()

Description copied from interface: RecordTranslator

Get the list of streams this translator will handle.

Specified by:

streams in interface RecordTranslator<K,V>

Returns:

the list of streams that this will handle.