org.apache.beam.fn.harness

Class MapFnRunners

java.lang.Object

org.apache.beam.fn.harness.MapFnRunners

public abstract class MapFnRunners
extends java.lang.Object

Utilities to create PTransformRunners which execute simple map functions.

Simple map functions are used in a large number of transforms, especially runner-managed transforms, such as map_windows.

TODO: Add support for DoFns which are actually user supplied map/lambda functions instead of using the FnApiDoFnRunner instance.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	MapFnRunners.ValueMapFnFactory<InputT,OutputT> A function factory which given a PTransform returns a map function.
static interface	MapFnRunners.WindowedValueMapFnFactory<InputT,OutputT> A function factory which given a PTransform returns a map function over the entire WindowedValue of input and output elements.

Constructor Summary

Constructors

Constructor and Description
MapFnRunners()

Method Summary

Modifier and Type	Method and Description
static <InputT,OutputT> PTransformRunnerFactory<?>	forValueMapFnFactory(MapFnRunners.ValueMapFnFactory<InputT,OutputT> fnFactory) Create a MapFnRunners where the map function consumes elements directly.
static <InputT,OutputT> PTransformRunnerFactory<?>	forWindowedValueMapFnFactory(MapFnRunners.WindowedValueMapFnFactory<InputT,OutputT> fnFactory) Create a MapFnRunners where the map function consumes Windowed Values and produced Windowed Values.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapFnRunners

public MapFnRunners()

Method Detail

forValueMapFnFactory

public static <InputT,OutputT> PTransformRunnerFactory<?> forValueMapFnFactory(MapFnRunners.ValueMapFnFactory<InputT,OutputT> fnFactory)

Create a MapFnRunners where the map function consumes elements directly.

forWindowedValueMapFnFactory

public static <InputT,OutputT> PTransformRunnerFactory<?> forWindowedValueMapFnFactory(MapFnRunners.WindowedValueMapFnFactory<InputT,OutputT> fnFactory)

Create a MapFnRunners where the map function consumes Windowed Values and produced Windowed Values.

Each WindowedValue provided to the function produced by the MapFnRunners.WindowedValueMapFnFactory will be in exactly one window.