com.hazelcast.mapreduce.aggregation.impl

Class CountAggregation<Key,Value>

java.lang.Object

com.hazelcast.mapreduce.aggregation.impl.CountAggregation<Key,Value>

Type Parameters:

Key - the key input type

Value - the value input type

All Implemented Interfaces:

AggType<Key,Value,Key,Object,Long,Long,Long>

public class CountAggregation<Key,Value>
extends Object
implements AggType<Key,Value,Key,Object,Long,Long,Long>

The predefined count aggregation.

Constructor Summary

Constructors

Constructor and Description
CountAggregation()

Method Summary

Methods

Modifier and Type	Method and Description
Collator<Map.Entry<Key,Long>,Long>	getCollator()
CombinerFactory<Key,Object,Long>	getCombinerFactory()
Mapper<Key,Value,Key,Object>	getMapper(Supplier<Key,Value,Object> supplier)
ReducerFactory<Key,Long,Long>	getReducerFactory()

Methods inherited from class java.lang.Object

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

Constructor Detail

CountAggregation

public CountAggregation()

Method Detail

getCollator

public Collator<Map.Entry<Key,Long>,Long> getCollator()

Specified by:

getCollator in interface AggType<Key,Value,Key,Object,Long,Long,Long>

getMapper

public Mapper<Key,Value,Key,Object> getMapper(Supplier<Key,Value,Object> supplier)

Specified by:

getMapper in interface AggType<Key,Value,Key,Object,Long,Long,Long>

getCombinerFactory

public CombinerFactory<Key,Object,Long> getCombinerFactory()

Specified by:

getCombinerFactory in interface AggType<Key,Value,Key,Object,Long,Long,Long>

getReducerFactory

public ReducerFactory<Key,Long,Long> getReducerFactory()

Specified by:

getReducerFactory in interface AggType<Key,Value,Key,Object,Long,Long,Long>