AggregationFunction (Flink : Runtime 2.1.0 API)

java.lang.Object
- org.apache.flink.streaming.api.functions.aggregation.AggregationFunction<T>

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.ReduceFunction<T>

Direct Known Subclasses:

ComparableAggregator, SumAggregator
```
@Internal
public abstract class AggregationFunction<T>
extends Object
implements org.apache.flink.api.common.functions.ReduceFunction<T>
```
Holder class for aggregation types that can be used on a windowed stream or keyed stream.

See Also:

Serialized Form

- Nested Class Summary
  
  Nested Classes
  Modifier and Type Class Description
  
  static class AggregationFunction.AggregationType
  Aggregation types that can be used on a windowed stream or keyed stream.
- Constructor Summary
  
  Constructors
  Constructor Description
  
  AggregationFunction()
- Method Summary
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface org.apache.flink.api.common.functions.ReduceFunction
    reduce

- Constructor Detail
  - AggregationFunction
```
public AggregationFunction()
```