Package org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn

Class InitializeDoFn

java.lang.Object

org.apache.beam.sdk.transforms.DoFn<byte[],PartitionMetadata>

org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn.InitializeDoFn

All Implemented Interfaces:

Serializable, HasDisplayData

public class InitializeDoFn
extends DoFn<byte[],PartitionMetadata>
implements Serializable

A DoFn responsible for initializing the change stream Connector. It handles the creation of the partition metadata table and the insertion of a fake partition (see InitialPartition.PARTITION_TOKEN), which will be used to dispatch the change streams query.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.beam.sdk.transforms.DoFn

DoFn.AlwaysFetched, DoFn.BoundedPerElement, DoFn.BundleFinalizer, DoFn.Element, DoFn.FieldAccess, DoFn.FinishBundle, DoFn.FinishBundleContext, DoFn.GetInitialRestriction, DoFn.GetInitialWatermarkEstimatorState, DoFn.GetRestrictionCoder, DoFn.GetSize, DoFn.GetWatermarkEstimatorStateCoder, DoFn.Key, DoFn.MultiOutputReceiver, DoFn.NewTracker, DoFn.NewWatermarkEstimator, DoFn.OnTimer, DoFn.OnTimerContext, DoFn.OnTimerFamily, DoFn.OnWindowExpiration, DoFn.OnWindowExpirationContext, DoFn.OutputReceiver<T>, DoFn.ProcessContext, DoFn.ProcessContinuation, DoFn.ProcessElement, DoFn.RequiresStableInput, DoFn.RequiresTimeSortedInput, DoFn.Restriction, DoFn.Setup, DoFn.SideInput, DoFn.SplitRestriction, DoFn.StartBundle, DoFn.StartBundleContext, DoFn.StateId, DoFn.Teardown, DoFn.TimerFamily, DoFn.TimerId, DoFn.Timestamp, DoFn.TruncateRestriction, DoFn.UnboundedPerElement, DoFn.WatermarkEstimatorState, DoFn.WindowedContext

Constructor Summary

Constructors

Constructor	Description
InitializeDoFn(DaoFactory daoFactory, MapperFactory mapperFactory, com.google.cloud.Timestamp startTimestamp, com.google.cloud.Timestamp endTimestamp)

Method Summary

Modifier and Type	Method	Description
void	processElement(DoFn.OutputReceiver<PartitionMetadata> receiver)

Methods inherited from class org.apache.beam.sdk.transforms.DoFn

getAllowedTimestampSkew, getInputTypeDescriptor, getOutputTypeDescriptor, populateDisplayData, prepareForProcessing

Methods inherited from class java.lang.Object

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

Constructor Details

InitializeDoFn

public InitializeDoFn(DaoFactory daoFactory,
 MapperFactory mapperFactory,
 com.google.cloud.Timestamp startTimestamp,
 com.google.cloud.Timestamp endTimestamp)

Method Details

processElement

@ProcessElement
public void processElement(DoFn.OutputReceiver<PartitionMetadata> receiver)