WindowFnTransform (Nemo Project 0.4 API)

java.lang.Object
- org.apache.nemo.common.ir.vertex.transform.LatencymarkEmitTransform<org.apache.beam.sdk.util.WindowedValue<T>,org.apache.beam.sdk.util.WindowedValue<T>>
- - org.apache.nemo.compiler.frontend.beam.transform.WindowFnTransform<T,W>

Type Parameters:

T - input/output type.

W - window type

All Implemented Interfaces:

java.io.Serializable, Transform<org.apache.beam.sdk.util.WindowedValue<T>,org.apache.beam.sdk.util.WindowedValue<T>>
```
public final class WindowFnTransform<T,W extends org.apache.beam.sdk.transforms.windowing.BoundedWindow>
extends LatencymarkEmitTransform<org.apache.beam.sdk.util.WindowedValue<T>,org.apache.beam.sdk.util.WindowedValue<T>>
```
Windowing transform implementation. This transform simply windows the given elements into finite windows according to a user-specified WindowFnTransform.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.nemo.common.ir.vertex.transform.Transform
  Transform.Context

Constructor Summary

Constructors
Constructor	Description
`WindowFnTransform(org.apache.beam.sdk.transforms.windowing.WindowFn windowFn, org.apache.beam.sdk.transforms.display.DisplayData displayData)`	Default Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the transform.
`void`	`onData(org.apache.beam.sdk.util.WindowedValue<T> windowedValue)`	On data received.
`void`	`onWatermark(Watermark watermark)`	On watermark received.
`java.lang.String`	`toString()`

Methods inherited from class org.apache.nemo.common.ir.vertex.transform.LatencymarkEmitTransform
getOutputCollector, onLatencymark, prepare

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

- Constructor Detail
  - WindowFnTransform
```
public WindowFnTransform(org.apache.beam.sdk.transforms.windowing.WindowFn windowFn,
                         org.apache.beam.sdk.transforms.display.DisplayData displayData)
```
    Default Constructor.
    
    Parameters:
    
    windowFn - windowFn for the Transform.
    
    displayData - display data.
- Method Detail
  - onData
```
public void onData(org.apache.beam.sdk.util.WindowedValue<T> windowedValue)
```
    Description copied from interface: Transform
    
    On data received.
    
    Parameters:
    
    windowedValue - data received.
  - onWatermark
```
public void onWatermark(Watermark watermark)
```
    Description copied from interface: Transform
    
    On watermark received. This method should be called for the minimum watermark among input streams (input watermark). Transform may emit collected data after receiving watermarks.
    
    Parameters:
    
    watermark - watermark
  - close
```
public void close()
```
    Description copied from interface: Transform
    
    Close the transform.
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object