org.apache.geode.cache.query

Interface Aggregator

public interface Aggregator

Behavior of a user-defined aggregator. Aggregates values and returns a result. In addition to the methods in the interface, implementing classes must have a 0-arg public constructor.

Method Summary

Modifier and Type	Method and Description
void	accumulate(Object value) Accumulate the next scalar value
void	init() Initialize the Aggregator
Object	terminate() Finish the aggregation and return the operation result.

Method Detail

init

void init()

Initialize the Aggregator

accumulate

void accumulate(Object value)

Accumulate the next scalar value

Parameters:

value - the scalar value to accumulate

terminate

Object terminate()

Finish the aggregation and return the operation result.

Returns:

Return the result scalar value