org.apache.flink.api.java.summarize.aggregation

Interface Aggregator<T,R>

Type Parameters:

T - the type to be aggregated

R - the result type of the aggregation

All Superinterfaces:

Serializable

All Known Implementing Classes:

BooleanSummaryAggregator, DoubleSummaryAggregator, DoubleSummaryAggregator.MaxDoubleAggregator, DoubleSummaryAggregator.MinDoubleAggregator, DoubleSummaryAggregator.SumDoubleAggregator, FloatSummaryAggregator, FloatSummaryAggregator.MaxFloatAggregator, FloatSummaryAggregator.MinFloatAggregator, FloatSummaryAggregator.SumFloatAggregator, IntegerSummaryAggregator, IntegerSummaryAggregator.MaxIntegerAggregator, IntegerSummaryAggregator.MinIntegerAggregator, IntegerSummaryAggregator.SumIntegerAggregator, LongSummaryAggregator, LongSummaryAggregator.MaxLongAggregator, LongSummaryAggregator.MinLongAggregator, LongSummaryAggregator.SumLongAggregator, NumericSummaryAggregator, ObjectSummaryAggregator, ShortSummaryAggregator, ShortSummaryAggregator.MaxShortAggregator, ShortSummaryAggregator.MinShortAggregator, ShortSummaryAggregator.SumShortAggregator, StringSummaryAggregator, TupleSummaryAggregator, ValueSummaryAggregator, ValueSummaryAggregator.BooleanValueSummaryAggregator, ValueSummaryAggregator.DoubleValueSummaryAggregator, ValueSummaryAggregator.FloatValueSummaryAggregator, ValueSummaryAggregator.IntegerValueSummaryAggregator, ValueSummaryAggregator.LongValueSummaryAggregator, ValueSummaryAggregator.ShortValueSummaryAggregator, ValueSummaryAggregator.StringValueSummaryAggregator

@Internal
public interface Aggregator<T,R>
extends Serializable

Generic interface for aggregation

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(T value) Add a value to the current aggregation
void	combine(Aggregator<T,R> otherSameType) Combine two aggregations of the same type.
R	result() Provide the final result of the aggregation

Method Detail

aggregate

void aggregate(T value)

Add a value to the current aggregation

combine

void combine(Aggregator<T,R> otherSameType)

Combine two aggregations of the same type. (Implementations will need to do an unchecked cast).

result

R result()

Provide the final result of the aggregation