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

接口 Aggregator<T,R>

类型参数:

T - the type to be aggregated

R - the result type of the aggregation

所有超级接口:

Serializable

所有已知实现类:

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, 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.

方法概要

限定符和类型	方法和说明
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.

方法详细资料

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.