org.apache.beam.fn.harness.state

Class StateBackedIterable<T>

java.lang.Object

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

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<T>

public class StateBackedIterable<T>
extends java.lang.Object
implements java.lang.Iterable<T>, java.io.Serializable

A state backed iterable which allows for fetching elements over the portability state API. See remote references for additional details.

One must supply a StateBackedIterable.StateBackedIterableTranslationContext when using CoderTranslator.fromComponents(java.util.List<org.apache.beam.sdk.coders.Coder<?>>, byte[], org.apache.beam.runners.core.construction.CoderTranslation.TranslationContext) to be able to create a StateBackedIterable.Coder.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StateBackedIterable.Coder<T> Decodes an Iterable that might be backed by state.
static class	StateBackedIterable.Registrar A CoderTranslatorRegistrar for beam:coder:state_backed_iterable:v1.
static interface	StateBackedIterable.StateBackedIterableTranslationContext Additional parameters required by the StateBackedIterable.Coder.

Constructor Summary

Constructors

Constructor and Description
StateBackedIterable(Cache<?,?> cache, BeamFnStateClient beamFnStateClient, java.lang.String instructionId, org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey stateKey, org.apache.beam.sdk.coders.Coder<T> elemCoder, java.util.List<T> prefix)

Method Summary

Modifier and Type	Method and Description
java.util.Iterator<T>	iterator()
protected java.lang.Object	writeReplace()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

StateBackedIterable

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

Method Detail

iterator

public java.util.Iterator<T> iterator()

Specified by:

iterator in interface java.lang.Iterable<T>

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException

Throws:

java.io.ObjectStreamException