com.espertech.esper.pattern.observer

Interface ObserverFactory

All Known Implementing Classes:

ObserverFactorySupport, TimerAtObserverFactory, TimerIntervalObserverFactory, TimerScheduleObserverFactory

public interface ObserverFactory

Interface for factories for making observer instances.

Method Summary

Modifier and Type	Method and Description
boolean	isNonRestarting()
EventObserver	makeObserver(PatternAgentInstanceContext context, MatchedEventMap beginState, ObserverEventEvaluator observerEventEvaluator, EvalStateNodeNumber stateNodeId, Object observerState, boolean isFilterChildNonQuitting) Make an observer instance.
void	setObserverParameters(List<ExprNode> observerParameters, MatchedEventConvertor convertor, ExprValidationContext validationContext) Sets the observer object parameters.

Method Detail

setObserverParameters

void setObserverParameters(List<ExprNode> observerParameters,
                           MatchedEventConvertor convertor,
                           ExprValidationContext validationContext)
                    throws ObserverParameterException

Sets the observer object parameters.

Parameters:

observerParameters - is a list of parameters

convertor - for converting partial pattern matches to event-per-stream for expressions

validationContext - context

Throws:

ObserverParameterException - thrown to indicate a parameter problem

makeObserver

EventObserver makeObserver(PatternAgentInstanceContext context,
                           MatchedEventMap beginState,
                           ObserverEventEvaluator observerEventEvaluator,
                           EvalStateNodeNumber stateNodeId,
                           Object observerState,
                           boolean isFilterChildNonQuitting)

Make an observer instance.

Parameters:

context - - services that may be required by observer implementation

beginState - - start state for observer

observerEventEvaluator - - receiver for events observed

stateNodeId - - optional id for the associated pattern state node

observerState - - state node for observer

isFilterChildNonQuitting - true for non-quitting filter

Returns:

observer instance

isNonRestarting

boolean isNonRestarting()