org.apache.beam.fn.harness.state

Class StateFetchingIterators

java.lang.Object

org.apache.beam.fn.harness.state.StateFetchingIterators

public class StateFetchingIterators
extends java.lang.Object

Adapters which convert a a logical series of chunks using continuation tokens over the Beam Fn State API into an Iterator of ByteStrings.

Method Summary

Modifier and Type	Method and Description
static java.util.Iterator<org.apache.beam.vendor.grpc.v1p13p1.com.google.protobuf.ByteString>	forFirstChunk(BeamFnStateClient beamFnStateClient, org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest stateRequestForFirstChunk) This adapter handles using the continuation token to provide iteration over all the chunks returned by the Beam Fn State API using the supplied state client and state request for the first chunk of the state stream.

Methods inherited from class java.lang.Object

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

Method Detail

forFirstChunk

public static java.util.Iterator<org.apache.beam.vendor.grpc.v1p13p1.com.google.protobuf.ByteString> forFirstChunk(BeamFnStateClient beamFnStateClient,
                                                                                                                   org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest stateRequestForFirstChunk)

This adapter handles using the continuation token to provide iteration over all the chunks returned by the Beam Fn State API using the supplied state client and state request for the first chunk of the state stream.

Parameters:

beamFnStateClient - A client for handling state requests.

stateRequestForFirstChunk - A fully populated state request for the first (and possibly only) chunk of a state stream. This state request will be populated with a continuation token to request further chunks of the stream if required.