org.apache.flink.streaming.api.functions.aggregation

Class SumAggregator<T>

java.lang.Object

org.apache.flink.streaming.api.functions.aggregation.AggregationFunction<T>

org.apache.flink.streaming.api.functions.aggregation.SumAggregator<T>

All Implemented Interfaces:

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

@Internal
public class SumAggregator<T>
extends AggregationFunction<T>

An AggregationFunction that sums up fields.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.functions.aggregation.AggregationFunction

AggregationFunction.AggregationType

Constructor Summary

Constructors

Constructor and Description
SumAggregator(int pos, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.ExecutionConfig config)
SumAggregator(String field, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, org.apache.flink.api.common.ExecutionConfig config)

Method Summary

Modifier and Type	Method and Description
T	reduce(T value1, T value2)

Methods inherited from class java.lang.Object

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

Constructor Detail

SumAggregator

public SumAggregator(int pos,
                     org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                     org.apache.flink.api.common.ExecutionConfig config)

SumAggregator

public SumAggregator(String field,
                     org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
                     org.apache.flink.api.common.ExecutionConfig config)

Method Detail

reduce

public T reduce(T value1,
                T value2)
         throws Exception

Throws:

Exception