com.espertech.esper.epl.agg.service

Class AggSvcGroupByLocalGroupBy

java.lang.Object

com.espertech.esper.epl.agg.service.AggSvcGroupLocalGroupByBase

com.espertech.esper.epl.agg.service.AggSvcGroupByLocalGroupBy

All Implemented Interfaces:

AggregationResultFuture, AggregationService, StopCallback

public class AggSvcGroupByLocalGroupBy
extends AggSvcGroupLocalGroupByBase

Implementation for handling aggregation with grouping by group-keys.

Field Summary

Fields inherited from class com.espertech.esper.epl.agg.service.AggSvcGroupLocalGroupByBase

aggregatorsPerLevelAndGroup, aggregatorsTopLevel, isJoin, localGroupByPlan, removedKeys, statesTopLevel

Constructor Summary

Constructors

Constructor and Description
AggSvcGroupByLocalGroupBy(boolean isJoin, AggregationLocalGroupByPlan localGroupByPlan)

Method Summary

Modifier and Type	Method and Description
protected Object	computeGroupKey(AggregationLocalGroupByLevel level, Object groupKey, ExprEvaluator[] partitionEval, EventBean[] eventsPerStream, boolean newData, ExprEvaluatorContext exprEvaluatorContext)
Object	getValue(int column, int agentInstanceId, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Returns current aggregation state, for use by expression node representing an aggregation function.
void	setCurrentAccess(Object groupByKey, int agentInstanceId, AggregationGroupByRollupLevel rollupLevel) Set the current aggregation state row - for use when evaluation nodes are asked to evaluate.

Methods inherited from class com.espertech.esper.epl.agg.service.AggSvcGroupLocalGroupByBase

accept, acceptGroupDetail, aggregateIntoEnter, aggregateIntoLeave, applyEnter, applyLeave, clearResults, clearResults, computeGroupKey, getAggregatorsPerLevelAndGroup, getAggregatorsTopLevel, getCollectionOfEvents, getCollectionScalar, getContextPartitionAggregationService, getEventBean, getGroupKey, getGroupKeys, getRemovedKeys, getStatesTopLevel, handleRemovedKeys, internalHandleGroupRemove, internalHandleUpdatedGroup, internalHandleUpdatedTop, isGrouped, setAggregatorsPerLevelAndGroup, setAggregatorsTopLevel, setRemovedCallback, setRemovedKeys, setStatesTopLevel, stop

Methods inherited from class java.lang.Object

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

Constructor Detail

AggSvcGroupByLocalGroupBy

public AggSvcGroupByLocalGroupBy(boolean isJoin,
                                 AggregationLocalGroupByPlan localGroupByPlan)

Method Detail

computeGroupKey

protected Object computeGroupKey(AggregationLocalGroupByLevel level,
                                 Object groupKey,
                                 ExprEvaluator[] partitionEval,
                                 EventBean[] eventsPerStream,
                                 boolean newData,
                                 ExprEvaluatorContext exprEvaluatorContext)

Specified by:

computeGroupKey in class AggSvcGroupLocalGroupByBase

setCurrentAccess

public void setCurrentAccess(Object groupByKey,
                             int agentInstanceId,
                             AggregationGroupByRollupLevel rollupLevel)

Description copied from interface: AggregationService

Set the current aggregation state row - for use when evaluation nodes are asked to evaluate.

Parameters:

groupByKey - - single key identifying the row of aggregation states

agentInstanceId - context partition id

rollupLevel - rollup level

getValue

public Object getValue(int column,
                       int agentInstanceId,
                       EventBean[] eventsPerStream,
                       boolean isNewData,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationResultFuture

Returns current aggregation state, for use by expression node representing an aggregation function.

Parameters:

column - is assigned to the aggregation expression node and passed as an column (index) into a row

agentInstanceId - the context partition id

eventsPerStream - events per stream

isNewData - new vs removed indicator

exprEvaluatorContext - context

Returns:

current aggragation state