Package org.apache.storm.kafka.spout
Class SimpleRecordTranslator<K,V>
- java.lang.Object
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- org.apache.storm.kafka.spout.SimpleRecordTranslator<K,V>
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- 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
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Field Summary
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Fields inherited from interface org.apache.storm.kafka.spout.RecordTranslator
DEFAULT_STREAM
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Constructor Summary
Constructors Constructor 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.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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.FieldsgetFieldsFor(String stream)Get the fields associated with a stream.List<String>streams()Get the list of streams this translator will handle.
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Constructor Detail
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SimpleRecordTranslator
public SimpleRecordTranslator(Func<org.apache.kafka.clients.consumer.ConsumerRecord<K,V>,List<Object>> func, Fields fields)
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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 Tuplefields- The fields tuples constructed by this translator will containstream- The stream tuples constructed by this translator will target
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Method Detail
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apply
public List<Object> apply(org.apache.kafka.clients.consumer.ConsumerRecord<K,V> record)
Description copied from interface:RecordTranslatorTranslate the ConsumerRecord into a list of objects that can be emitted.- Specified by:
applyin interfaceFunc<K,V>- Specified by:
applyin interfaceRecordTranslator<K,V>- Parameters:
record- the record to translate- Returns:
- the objects in the tuple. Return a
KafkaTupleif you want to route the tuple to a non-default stream. Returnnullto discard an invalidConsumerRecordifKafkaSpoutConfig.Builder.setEmitNullTuples(boolean)is set tofalse.
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getFieldsFor
public Fields getFieldsFor(String stream)
Description copied from interface:RecordTranslatorGet the fields associated with a stream. The streams passed in are returned by theRecordTranslator.streams()method.- Specified by:
getFieldsForin interfaceRecordTranslator<K,V>- Parameters:
stream- the stream the fields are for- Returns:
- the fields for that stream.
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streams
public List<String> streams()
Description copied from interface:RecordTranslatorGet the list of streams this translator will handle.- Specified by:
streamsin interfaceRecordTranslator<K,V>- Returns:
- the list of streams that this will handle.
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