org.apache.beam.fn.harness.state

Class BagUserState<T>

java.lang.Object

org.apache.beam.fn.harness.state.BagUserState<T>

public class BagUserState<T>
extends java.lang.Object

An implementation of a bag user state that utilizes the Beam Fn State API to fetch, clear and persist values.

Calling asyncClose() schedules any required persistence changes. This object should no longer be used after it is closed.

TODO: Move to an async persist model where persistence is signalled based upon cache memory pressure and its need to flush.

Constructor Summary

Constructors

Constructor and Description
BagUserState(Cache<?,?> cache, BeamFnStateClient beamFnStateClient, java.lang.String instructionId, org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey stateKey, org.apache.beam.sdk.coders.Coder<T> valueCoder) The cache must be namespaced for this state object accordingly.

Method Summary

Modifier and Type	Method and Description
void	append(T t)
void	asyncClose()
void	clear()
org.apache.beam.sdk.fn.stream.PrefetchableIterable<T>	get()

Methods inherited from class java.lang.Object

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

Constructor Detail

BagUserState

public BagUserState(Cache<?,?> cache,
                    BeamFnStateClient beamFnStateClient,
                    java.lang.String instructionId,
                    org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey stateKey,
                    org.apache.beam.sdk.coders.Coder<T> valueCoder)

The cache must be namespaced for this state object accordingly.

Method Detail

get

public org.apache.beam.sdk.fn.stream.PrefetchableIterable<T> get()

append

public void append(T t)

clear

public void clear()

asyncClose

public void asyncClose()
                throws java.lang.Exception

Throws:

java.lang.Exception