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

java.lang.Object
  extended by com.espertech.esper.epl.agg.service.AggregationServiceBaseGrouped
      extended by com.espertech.esper.epl.agg.service.AggSvcGroupByNoAccessImpl
All Implemented Interfaces:
AggregationResultFuture, AggregationService

public class AggSvcGroupByNoAccessImpl
extends AggregationServiceBaseGrouped

Implementation for handling aggregation with grouping by group-keys.


Field Summary
 
Fields inherited from class com.espertech.esper.epl.agg.service.AggregationServiceBaseGrouped
aggregators, evaluators, groupKeyBinding
 
Constructor Summary
AggSvcGroupByNoAccessImpl(ExprEvaluator[] evaluators, AggregationMethodFactory[] prototypes, java.lang.Object groupKeyBinding, MethodResolutionService methodResolutionService)
          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> getCollection(int column, ExprEvaluatorContext context)
           
 EventBean getEventBean(int column, 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)
          Returns current aggregation state, for use by expression node representing an aggregation function.
 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
 

Constructor Detail

AggSvcGroupByNoAccessImpl

public AggSvcGroupByNoAccessImpl(ExprEvaluator[] evaluators,
                                 AggregationMethodFactory[] prototypes,
                                 java.lang.Object groupKeyBinding,
                                 MethodResolutionService methodResolutionService)
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
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)
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

getCollection

public java.util.Collection<EventBean> getCollection(int column,
                                                     ExprEvaluatorContext context)

getEventBean

public EventBean getEventBean(int column,
                              ExprEvaluatorContext context)

setRemovedCallback

public void setRemovedCallback(AggregationRowRemovedCallback callback)

accept

public void accept(AggregationServiceVisitor visitor)

acceptGroupDetail

public void acceptGroupDetail(AggregationServiceVisitorWGroupDetail visitor)

isGrouped

public boolean isGrouped()

getGroupKey

public java.lang.Object getGroupKey(int agentInstanceId)

getGroupKeys

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

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