org.apache.beam.fn.harness

Interface PrecombineGroupingTable.Combiner<K,InputT,AccumT,OutputT>

All Known Implementing Classes:

PrecombineGroupingTable.ValueCombiner

Enclosing class:

PrecombineGroupingTable<K,InputT,AccumT>

public static interface PrecombineGroupingTable.Combiner<K,InputT,AccumT,OutputT>

Provides client-specific operations for combining values.

Method Summary

Modifier and Type	Method and Description
AccumT	add(K key, AccumT accumulator, InputT value)
AccumT	compact(K key, AccumT accumulator)
AccumT	createAccumulator(K key)
OutputT	extract(K key, AccumT accumulator)
AccumT	merge(K key, java.lang.Iterable<AccumT> accumulators)

Method Detail

createAccumulator

AccumT createAccumulator(K key)

add

AccumT add(K key,
           AccumT accumulator,
           InputT value)

merge

AccumT merge(K key,
             java.lang.Iterable<AccumT> accumulators)

compact

AccumT compact(K key,
               AccumT accumulator)

extract

OutputT extract(K key,
                AccumT accumulator)