org.apache.beam.fn.harness

Class WindowMergingFnRunner<T,W extends org.apache.beam.sdk.transforms.windowing.BoundedWindow>

java.lang.Object

org.apache.beam.fn.harness.WindowMergingFnRunner<T,W>

public abstract class WindowMergingFnRunner<T,W extends org.apache.beam.sdk.transforms.windowing.BoundedWindow>
extends java.lang.Object

Merges windows using a WindowFn.

Window merging function:

• Input: KV<nonce, iterable<OriginalWindow>>
• Output: KV<nonce, KV<iterable<UnmergedOriginalWindow>, iterable<KV<MergedWindow, iterable<ConsumedOriginalWindow>>>>

For each set of original windows, a list of all unmerged windows is output alongside a map of merged window to set of consumed windows. All original windows must be contained in either the unmerged original window set or one of the consumed original window sets. Each original window can only be part of one output set. The nonce is used by a runner to associate each input with its output. The nonce is represented as an opaque set of bytes.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WindowMergingFnRunner.Registrar A registrar which provides a factory to handle merging windows based upon the WindowFn.

Constructor Summary

Constructors

Constructor and Description
WindowMergingFnRunner()

Method Summary

Methods inherited from class java.lang.Object

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

Constructor Detail

WindowMergingFnRunner

public WindowMergingFnRunner()