com.espertech.esper.pattern.guard
Class ExpressionGuard

java.lang.Object
  com.espertech.esper.pattern.guard.ExpressionGuard

All Implemented Interfaces:

Guard

public class ExpressionGuard
extends java.lang.Object
implements Guard

Guard implementation that keeps a timer instance and quits when the timer expired, and also keeps a count of the number of matches so far, checking both count and timer, letting all MatchedEventMap instances pass until then.

Constructor Summary

ExpressionGuard(MatchedEventConvertor convertor, ExprEvaluator expression, Quitable quitable)
Ctor.

Method Summary

void	accept(EventGuardVisitor visitor)
boolean	inspect(MatchedEventMap matchEvent) Returns true if inspection shows that the match events can pass, or false to not pass.
void	startGuard() Start the guard operation.
void	stopGuard() Called when sub-expression quits, or when the pattern stopped.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionGuard

public ExpressionGuard(MatchedEventConvertor convertor,
                       ExprEvaluator expression,
                       Quitable quitable)

Ctor.

Parameters:

quitable - - to use to indicate that the gaurd quitted

Method Detail

startGuard

public void startGuard()

Description copied from interface: Guard

Start the guard operation.

Specified by:

startGuard in interface Guard

inspect

public boolean inspect(MatchedEventMap matchEvent)

Description copied from interface: Guard

Returns true if inspection shows that the match events can pass, or false to not pass.

Specified by:

inspect in interface Guard

Parameters:

matchEvent - is the map of matching events

Returns:

true to pass, false to not pass

stopGuard

public void stopGuard()

Description copied from interface: Guard

Called when sub-expression quits, or when the pattern stopped.

Specified by:

stopGuard in interface Guard

accept

public void accept(EventGuardVisitor visitor)

Specified by:

accept in interface Guard