com.espertech.esper.epl.agg.service

Class AggregationServiceTable

java.lang.Object

com.espertech.esper.epl.agg.service.AggregationServiceTable

All Implemented Interfaces:

AggregationResultFuture, AggregationService, StopCallback

public class AggregationServiceTable
extends Object
implements AggregationService

Constructor Summary

Constructors

Constructor and Description
AggregationServiceTable(TableStateInstance tableState)

Method Summary

Modifier and Type	Method and Description
void	accept(AggregationServiceVisitor visitor)
void	acceptGroupDetail(AggregationServiceVisitorWGroupDetail visitor)
void	applyEnter(EventBean[] eventsPerStream, Object optionalGroupKeyPerRow, ExprEvaluatorContext exprEvaluatorContext) Apply events as entering a window (new events).
void	applyLeave(EventBean[] eventsPerStream, Object optionalGroupKeyPerRow, ExprEvaluatorContext exprEvaluatorContext) Apply events as leaving a window (old events).
void	clearResults(ExprEvaluatorContext exprEvaluatorContext) Clear current aggregation state.
Collection<EventBean>	getCollectionOfEvents(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
Collection<Object>	getCollectionScalar(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
AggregationService	getContextPartitionAggregationService(int agentInstanceId)
EventBean	getEventBean(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
Object	getGroupKey(int agentInstanceId)
Collection<Object>	getGroupKeys(ExprEvaluatorContext exprEvaluatorContext)
TableStateInstance	getTableState()
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.
boolean	isGrouped()
void	setCurrentAccess(Object groupKey, int agentInstanceId, AggregationGroupByRollupLevel rollupLevel) Set the current aggregation state row - for use when evaluation nodes are asked to evaluate.
void	setRemovedCallback(AggregationRowRemovedCallback callback)
void	stop() Stops the underlying resources.

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregationServiceTable

public AggregationServiceTable(TableStateInstance tableState)

Method Detail

getTableState

public TableStateInstance getTableState()

applyEnter

public void applyEnter(EventBean[] eventsPerStream,
                       Object optionalGroupKeyPerRow,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Apply events as entering a window (new events).

Specified by:

applyEnter in interface AggregationService

Parameters:

eventsPerStream - - events for each stream entering window

optionalGroupKeyPerRow - - 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,
                       Object optionalGroupKeyPerRow,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Apply events as leaving a window (old events).

Specified by:

applyLeave in interface AggregationService

Parameters:

eventsPerStream - - events for each stream entering window

optionalGroupKeyPerRow - - 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(Object groupKey,
                             int agentInstanceId,
                             AggregationGroupByRollupLevel rollupLevel)

Description copied from interface: AggregationService

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

Specified by:

setCurrentAccess in interface AggregationService

Parameters:

groupKey - - single key identifying the row of aggregation states

agentInstanceId - context partition id

rollupLevel - rollup level

clearResults

public void clearResults(ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: AggregationService

Clear current aggregation state.

Specified by:

clearResults in interface AggregationService

Parameters:

exprEvaluatorContext - context

setRemovedCallback

public void setRemovedCallback(AggregationRowRemovedCallback callback)

Specified by:

setRemovedCallback in interface AggregationService

accept

public void accept(AggregationServiceVisitor visitor)

Specified by:

accept in interface AggregationService

acceptGroupDetail

public void acceptGroupDetail(AggregationServiceVisitorWGroupDetail visitor)

Specified by:

acceptGroupDetail in interface AggregationService

isGrouped

public boolean isGrouped()

Specified by:

isGrouped in interface AggregationService

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.

Specified by:

getValue in interface AggregationResultFuture

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

getCollectionOfEvents

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

Specified by:

getCollectionOfEvents in interface AggregationResultFuture

getEventBean

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

Specified by:

getEventBean in interface AggregationResultFuture

getGroupKey

public Object getGroupKey(int agentInstanceId)

Specified by:

getGroupKey in interface AggregationResultFuture

getGroupKeys

public Collection<Object> getGroupKeys(ExprEvaluatorContext exprEvaluatorContext)

Specified by:

getGroupKeys in interface AggregationResultFuture

getCollectionScalar

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

Specified by:

getCollectionScalar in interface AggregationResultFuture

stop

public void stop()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

getContextPartitionAggregationService

public AggregationService getContextPartitionAggregationService(int agentInstanceId)

Specified by:

getContextPartitionAggregationService in interface AggregationService