GroupByKeyTransform (Nemo Project 0.4 API)

java.lang.Object
- org.apache.nemo.common.ir.vertex.transform.NoWatermarkEmitTransform<I,org.apache.beam.sdk.util.WindowedValue<org.apache.beam.sdk.values.KV<java.lang.Object,java.util.List>>>
- - org.apache.nemo.compiler.frontend.beam.transform.GroupByKeyTransform<I>

Type Parameters:

I - input type.

All Implemented Interfaces:

java.io.Serializable, Transform<I,org.apache.beam.sdk.util.WindowedValue<org.apache.beam.sdk.values.KV<java.lang.Object,java.util.List>>>
```
public final class GroupByKeyTransform<I>
extends NoWatermarkEmitTransform<I,org.apache.beam.sdk.util.WindowedValue<org.apache.beam.sdk.values.KV<java.lang.Object,java.util.List>>>
```
Group Beam KVs.

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

GroupByKeyTransform()
GroupByKey constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the transform.
`void`	`onData(I element)`	On data received.
`void`	`prepare(Transform.Context context, OutputCollector<org.apache.beam.sdk.util.WindowedValue<org.apache.beam.sdk.values.KV<java.lang.Object,java.util.List>>> oc)`	Prepare the transform.

Methods inherited from class org.apache.nemo.common.ir.vertex.transform.NoWatermarkEmitTransform
onLatencymark, onWatermark

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

- Constructor Detail
  - GroupByKeyTransform
```
public GroupByKeyTransform()
```
    GroupByKey constructor.
- Method Detail
  - prepare
```
public void prepare(Transform.Context context,
                    OutputCollector<org.apache.beam.sdk.util.WindowedValue<org.apache.beam.sdk.values.KV<java.lang.Object,java.util.List>>> oc)
```
    Description copied from interface: Transform
    
    Prepare the transform.
    
    Parameters:
    
    context - of the transform.
    
    oc - that collects outputs.
  - onData
```
public void onData(I element)
```
    Description copied from interface: Transform
    
    On data received.
    
    Parameters:
    
    element - data received.
  - close
```
public void close()
```
    Description copied from interface: Transform
    
    Close the transform.