Package org.apache.beam.sdk.io.aws2.dynamodb

Class DynamoDBIO.Read<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<T>>

org.apache.beam.sdk.io.aws2.dynamodb.DynamoDBIO.Read<T>

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

DynamoDBIO

public abstract static class DynamoDBIO.Read<T>
extends PTransform<PBegin,PCollection<T>>

Read data from DynamoDB using getScanRequestFn() and emit an element of type DynamoDBIO.Read for each ScanResponse using the mapping function getScanResponseMapperFn().

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

annotations, displayData, name, resourceHints

Constructor Summary

Constructors

Constructor	Description
Read()

Method Summary

Modifier and Type	Method	Description
PCollection<T>	expand(PBegin input)	Override this method to specify how this PTransform should be expanded on the given InputT.
DynamoDBIO.Read<List<Map<String,AttributeValue>>>	items()
DynamoDBIO.Read<T>	withClientConfiguration(ClientConfiguration config)	Configuration of DynamoDB client.
DynamoDBIO.Read<T>	withCoder(Coder<T> coder)
DynamoDBIO.Read<T>	withScanRequestFn(SerializableFunction<Void,ScanRequest> fn)	Can't pass ScanRequest object directly from client since this object is not full serializable.
DynamoDBIO.Read<T>	withScanResponseMapperFn(SerializableFunction<ScanResponse,T> scanResultMapperFn)

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

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Constructor Details

Read

public Read()

Method Details

withClientConfiguration

public DynamoDBIO.Read<T> withClientConfiguration(ClientConfiguration config)

Configuration of DynamoDB client.

withScanRequestFn

public DynamoDBIO.Read<T> withScanRequestFn(SerializableFunction<Void,ScanRequest> fn)

Can't pass ScanRequest object directly from client since this object is not full serializable.

withScanResponseMapperFn

public DynamoDBIO.Read<T> withScanResponseMapperFn(SerializableFunction<ScanResponse,T> scanResultMapperFn)

items

public DynamoDBIO.Read<List<Map<String,AttributeValue>>> items()

withCoder

public DynamoDBIO.Read<T> withCoder(Coder<T> coder)

expand

public PCollection<T> expand(PBegin input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PBegin,PCollection<T>>