Interface RedisLookupMapper
- All Superinterfaces:
- RedisMapper,- Serializable,- TupleMapper
- All Known Implementing Classes:
- WordCountLookupMapper
RedisLookupMapper is for defining spec. which is used for querying value from Redis and converting response to tuple.
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Method SummaryModifier and TypeMethodDescriptionvoiddeclareOutputFields(OutputFieldsDeclarer declarer) declare what are the fields that this code will output.Converts return value from Redis to a list of storm values that can be emitted.Methods inherited from interface org.apache.storm.redis.common.mapper.RedisMappergetDataTypeDescriptionMethods inherited from interface org.apache.storm.redis.common.mapper.TupleMappergetKeyFromTuple, getValueFromTuple
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Method Details- 
toTupleConverts return value from Redis to a list of storm values that can be emitted.- Parameters:
- input- the input tuple.
- value- Redis query response value. Can be String, Boolean, Long regarding of data type.
- Returns:
- a List of storm values that can be emitted. Each item in list is emitted as an output tuple.
 
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declareOutputFieldsdeclare what are the fields that this code will output.- Parameters:
- declarer- OutputFieldsDeclarer
 
 
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