org.apache.beam.runners.samza.transforms

Class UpdatingCombineFn<InputT,AccumT,OutputT>

java.lang.Object

org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

org.apache.beam.runners.samza.transforms.UpdatingCombineFn<InputT,AccumT,OutputT>

All Implemented Interfaces:

java.io.Serializable, org.apache.beam.sdk.transforms.CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT>, org.apache.beam.sdk.transforms.display.HasDisplayData

public abstract class UpdatingCombineFn<InputT,AccumT,OutputT>
extends org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

Currently Beam only supports either throw away the accumulation or keep it after firing. This CombineFn allows more flexibility to update the accumulation.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UpdatingCombineFn()

Method Summary

Modifier and Type	Method and Description
abstract AccumT	updateAfterFiring(AccumT accumulator) Returns an updated accumulator from the given accumulator after firing a window pane.

Methods inherited from class org.apache.beam.sdk.transforms.Combine.CombineFn

addInput, apply, compact, createAccumulator, defaultValue, extractOutput, getInputType, getOutputType, mergeAccumulators

Methods inherited from class java.lang.Object

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

Constructor Detail

UpdatingCombineFn

public UpdatingCombineFn()

Method Detail

updateAfterFiring

public abstract AccumT updateAfterFiring(AccumT accumulator)

Returns an updated accumulator from the given accumulator after firing a window pane.

For efficiency, the input accumulator may be modified and returned.