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

java.lang.Object
  com.espertech.esper.epl.agg.service.AggregationServiceBaseGrouped
      com.espertech.esper.epl.agg.service.AggSvcGroupByRefcountedWAccessImpl

All Implemented Interfaces:

AggregationResultFuture, AggregationService

public class AggSvcGroupByRefcountedWAccessImpl
extends AggregationServiceBaseGrouped

Implementation for handling aggregation with grouping by group-keys.

Field Summary

protected AggregationStateFactory[]	accessAggregations
protected AggregationAccessorSlotPair[]	accessors
protected java.util.Map<java.lang.Object,AggregationMethodPairRow>	aggregatorsPerGroup
protected boolean	isJoin
protected java.util.List<java.lang.Object>	removedKeys

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

aggregators, evaluators, groupKeyBinding

Constructor Summary

AggSvcGroupByRefcountedWAccessImpl(ExprEvaluator[] evaluators, AggregationMethodFactory[] prototypes, java.lang.Object groupKeyBinding, MethodResolutionService methodResolutionService, AggregationAccessorSlotPair[] accessors, AggregationStateFactory[] accessAggregations, boolean isJoin)
Ctor.

Method Summary

void	accept(AggregationServiceVisitor visitor)
void	acceptGroupDetail(AggregationServiceVisitorWGroupDetail visitor)
void	applyEnter(EventBean[] eventsPerStream, java.lang.Object groupByKey, ExprEvaluatorContext exprEvaluatorContext) Apply events as entering a window (new events).
void	applyLeave(EventBean[] eventsPerStream, java.lang.Object groupByKey, ExprEvaluatorContext exprEvaluatorContext) Apply events as leaving a window (old events).
void	clearResults(ExprEvaluatorContext exprEvaluatorContext) Clear current aggregation state.
java.util.Collection<EventBean>	getCollectionOfEvents(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
java.util.Collection<java.lang.Object>	getCollectionScalar(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
EventBean	getEventBean(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
java.lang.Object	getGroupKey(int agentInstanceId)
java.util.Collection<java.lang.Object>	getGroupKeys(ExprEvaluatorContext exprEvaluatorContext)
java.lang.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.
protected void	handleRemovedKeys()
void	internalHandleGroupRemove(java.lang.Object groupByKey)
void	internalHandleGroupUpdate(java.lang.Object groupByKey, AggregationMethodPairRow row)
boolean	isGrouped()
void	setCurrentAccess(java.lang.Object groupByKey, int agentInstanceId, AggregationGroupByRollupLevel rollupLevel) Set the current aggregation state row - for use when evaluation nodes are asked to evaluate.
void	setRemovedCallback(AggregationRowRemovedCallback callback)

Methods inherited from class java.lang.Object

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

Field Detail

accessors

protected final AggregationAccessorSlotPair[] accessors

accessAggregations

protected final AggregationStateFactory[] accessAggregations

isJoin

protected final boolean isJoin

aggregatorsPerGroup

protected java.util.Map<java.lang.Object,AggregationMethodPairRow> aggregatorsPerGroup

removedKeys

protected java.util.List<java.lang.Object> removedKeys

Constructor Detail

AggSvcGroupByRefcountedWAccessImpl

public AggSvcGroupByRefcountedWAccessImpl(ExprEvaluator[] evaluators,
                                          AggregationMethodFactory[] prototypes,
                                          java.lang.Object groupKeyBinding,
                                          MethodResolutionService methodResolutionService,
                                          AggregationAccessorSlotPair[] accessors,
                                          AggregationStateFactory[] accessAggregations,
                                          boolean isJoin)

Ctor.

Parameters:

evaluators - - evaluate the sub-expression within the aggregate function (ie. sum(4*myNum))

prototypes - - collect the aggregation state that evaluators evaluate to, act as prototypes for new aggregations aggregation states for each group

methodResolutionService - - factory for creating additional aggregation method instances per group key

accessors - accessor definitions

accessAggregations - access aggs

isJoin - true for join, false for single-stream

Method Detail

clearResults

public void clearResults(ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Clear current aggregation state.

applyEnter

public void applyEnter(EventBean[] eventsPerStream,
                       java.lang.Object groupByKey,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Apply events as entering a window (new events).

Parameters:

eventsPerStream - - events for each stream entering window

groupByKey - - can be null if grouping without keys is desired, else the keys or array of keys to use for grouping, each distinct key value results in a new row of aggregation state.

exprEvaluatorContext - context for expression evaluatiom

applyLeave

public void applyLeave(EventBean[] eventsPerStream,
                       java.lang.Object groupByKey,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Apply events as leaving a window (old events).

Parameters:

eventsPerStream - - events for each stream entering window

groupByKey - - can be null if grouping without keys is desired, else the keys or array of keys to use for grouping, each distinct key value results in a new row of aggregation state.

exprEvaluatorContext - context for expression evaluatiom

setCurrentAccess

public void setCurrentAccess(java.lang.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

getValue

public java.lang.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

Returns:

current aggragation state

getCollectionOfEvents

public java.util.Collection<EventBean> getCollectionOfEvents(int column,
                                                             EventBean[] eventsPerStream,
                                                             boolean isNewData,
                                                             ExprEvaluatorContext context)

getCollectionScalar

public java.util.Collection<java.lang.Object> getCollectionScalar(int column,
                                                                  EventBean[] eventsPerStream,
                                                                  boolean isNewData,
                                                                  ExprEvaluatorContext context)

getEventBean

public EventBean getEventBean(int column,
                              EventBean[] eventsPerStream,
                              boolean isNewData,
                              ExprEvaluatorContext context)

setRemovedCallback

public void setRemovedCallback(AggregationRowRemovedCallback callback)

internalHandleGroupUpdate

public void internalHandleGroupUpdate(java.lang.Object groupByKey,
                                      AggregationMethodPairRow row)

internalHandleGroupRemove

public void internalHandleGroupRemove(java.lang.Object groupByKey)

accept

public void accept(AggregationServiceVisitor visitor)

acceptGroupDetail

public void acceptGroupDetail(AggregationServiceVisitorWGroupDetail visitor)

isGrouped

public boolean isGrouped()

handleRemovedKeys

protected void handleRemovedKeys()

getGroupKey

public java.lang.Object getGroupKey(int agentInstanceId)

getGroupKeys

public java.util.Collection<java.lang.Object> getGroupKeys(ExprEvaluatorContext exprEvaluatorContext)