WindowFn.MergeContext (core 2.44.0 API)

java.lang.Object
- org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext

Enclosing class:

WindowFn<T,W extends BoundedWindow>
```
public abstract class WindowFn.MergeContext
extends java.lang.Object
```
Information available when running WindowFn.mergeWindows(org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext).

Constructor Summary

Constructors
Constructor Description

MergeContext()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract void`	`merge(java.util.Collection<W> toBeMerged, W mergeResult)`	Signals to the framework that the windows in `toBeMerged` should be merged together to form `mergeResult`.
`abstract java.util.Collection<W>`	`windows()`	Returns the current set of windows.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MergeContext
```
public MergeContext()
```
- Method Detail
  - windows
```
public abstract java.util.Collection<W> windows()
```
    Returns the current set of windows.
  - merge
```
public abstract void merge(java.util.Collection<W> toBeMerged,
                           W mergeResult)
                    throws java.lang.Exception
```
    Signals to the framework that the windows in toBeMerged should be merged together to form mergeResult.
    toBeMerged should be a subset of windows() and disjoint from the toBeMerged set of previous calls to merge.
    mergeResult must either not be in windows() or be in toBeMerged.
    
    Throws:
    
    java.lang.IllegalArgumentException - if any elements of toBeMerged are not in windows(), or have already been merged
    
    java.lang.Exception