com.espertech.esper.epl.agg.service
Class AggregationServiceBase

java.lang.Object
  com.espertech.esper.epl.agg.service.AggregationServiceBase

All Implemented Interfaces:

AggregationResultFuture, AggregationService

public abstract class AggregationServiceBase
extends java.lang.Object
implements AggregationService

All aggregation services require evaluation nodes which supply the value to be aggregated (summed, averaged, etc.) and aggregation state factories to make new aggregation states.

Field Summary

protected ExprEvaluator[]

evaluators Evaluation nodes under.

Constructor Summary

AggregationServiceBase(ExprEvaluator[] evaluators)
Ctor.

Method Summary

ExprEvaluator[]

getEvaluators()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.epl.agg.service.AggregationService

accept, acceptGroupDetail, applyEnter, applyLeave, clearResults, isGrouped, setCurrentAccess, setRemovedCallback

Methods inherited from interface com.espertech.esper.epl.agg.service.AggregationResultFuture

getCollectionOfEvents, getCollectionScalar, getEventBean, getGroupKey, getGroupKeys, getValue

Field Detail

evaluators

protected ExprEvaluator[] evaluators

Evaluation nodes under.

Constructor Detail

AggregationServiceBase

public AggregationServiceBase(ExprEvaluator[] evaluators)

Ctor.

Parameters:

evaluators - - are the child node of each aggregation function used for computing the value to be aggregated

Method Detail

getEvaluators

public ExprEvaluator[] getEvaluators()