com.espertech.esper.plugin
Interface PlugInAggregationMultiFunctionStateFactory

public interface PlugInAggregationMultiFunctionStateFactory

State factory responsible for allocating a state object for each group when used with group-by.

Method Summary

AggregationState

makeAggregationState(PlugInAggregationMultiFunctionStateContext stateContext) Return a new aggregation state holder for a given group (or ungrouped if there is no group-by).

Method Detail

makeAggregationState

AggregationState makeAggregationState(PlugInAggregationMultiFunctionStateContext stateContext)

Return a new aggregation state holder for a given group (or ungrouped if there is no group-by).

Parameters:

stateContext - context includes group key

Returns:

state holder, cannot be a null value