Package org.apache.storm.redis.common.mapper

## Interface TupleMapper

- All Superinterfaces:
    `Serializable`
  All Known Subinterfaces:
    `RedisFilterMapper`, `RedisLookupMapper`, `RedisStoreMapper`
  All Known Implementing Classes:
    `WordCountLookupMapper`, `WordCountStoreMapper`

      public interface TupleMapper
      extends Serializable

  TupleMapper defines how to extract key and value from tuple for Redis.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `String` | `getKeyFromTuple​(ITuple tuple)` | Extracts key from tuple.
    `String` | `getValueFromTuple​(ITuple tuple)` | Extracts value from tuple.

- - ### Method Detail

    - #### getKeyFromTuple

          String getKeyFromTuple​(ITuple tuple)

      Extracts key from tuple.
      Parameters:
        `tuple` - source tuple
      Returns:
        key

    - #### getValueFromTuple

          String getValueFromTuple​(ITuple tuple)

      Extracts value from tuple.
      Parameters:
        `tuple` - source tuple
      Returns:
        value