Re: cep code

[aitozi]

Then what is STOP state in NFA, i haven't seen this state in event pattern
match paper ? Does each Not pattern will be transformed to stop state?



--
Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/

Re: cep code

[Dawid Wysakowicz]

Hi,

It is a very low level detail of the CEP library, that should be transparent 
for the end-user.

However, just to clarify it a bit, it is expected. The reason behind this 
function is to create an optional path that bypasses all optional states. 
NOT_FOLLOW is treated as part of optional path, but in contrast to OPTIONAL its 
condition should be taken into account into the combined condition. Hope it 
helps.

Regards,
Dawid

> On 5 Mar 2018, at 10:42, aitozi  wrote:
> 
> Hi,
> 
> i am reading flink-cep source code based on release-1.3.2 . I cant
> understand here , can anyone help me on this in NFACompiler?
> 
> private List, String>>
> getCurrentNotCondition() {
>   List, String>> 
> notConditions = new
> ArrayList<>();
> 
>   Pattern previousPattern = 
> currentPattern;
>   while (previousPattern.getPrevious() != null && (
> 
> previousPattern.getPrevious().getQuantifier().hasProperty(Quantifier.QuantifierProperty.OPTIONAL)
> ||
>   
> previousPattern.getPrevious().getQuantifier().getConsumingStrategy() ==
> Quantifier.ConsumingStrategy.NOT_FOLLOW)) {
> 
>   previousPattern = previousPattern.getPrevious();
> 
>   if 
> (previousPattern.getQuantifier().getConsumingStrategy() ==
> Quantifier.ConsumingStrategy.NOT_FOLLOW) {
>   final IterativeCondition 
> notCondition = (IterativeCondition)
> previousPattern.getCondition();
>   
> notConditions.add(Tuple2.of(notCondition, previousPattern.getName()));
>   }
>   }
>   return notConditions;
>   }
> 
> it choose the pattern "hasProperty(Quantifier.QuantifierProperty.OPTIONAL)"
> or "Quantifier.ConsumingStrategy.NOT_FOLLOW" but it just add it to
> notConditions when it is "Quantifier.ConsumingStrategy.NOT_FOLLOW" is there
> something wrong
> 
> 
> 
> 
> --
> Sent from: 
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/



signature.asc
Description: Message signed with OpenPGP

cep code

[aitozi]

Hi,

i am reading flink-cep source code based on release-1.3.2 . I cant
understand here , can anyone help me on this in NFACompiler?

private List, String>>
getCurrentNotCondition() {
List, String>> 
notConditions = new
ArrayList<>();

Pattern previousPattern = 
currentPattern;
while (previousPattern.getPrevious() != null && (

previousPattern.getPrevious().getQuantifier().hasProperty(Quantifier.QuantifierProperty.OPTIONAL)
||

previousPattern.getPrevious().getQuantifier().getConsumingStrategy() ==
Quantifier.ConsumingStrategy.NOT_FOLLOW)) {

previousPattern = previousPattern.getPrevious();

if 
(previousPattern.getQuantifier().getConsumingStrategy() ==
Quantifier.ConsumingStrategy.NOT_FOLLOW) {
final IterativeCondition 
notCondition = (IterativeCondition)
previousPattern.getCondition();

notConditions.add(Tuple2.of(notCondition, previousPattern.getName()));
}
}
return notConditions;
}

it choose the pattern "hasProperty(Quantifier.QuantifierProperty.OPTIONAL)"
or "Quantifier.ConsumingStrategy.NOT_FOLLOW" but it just add it to
notConditions when it is "Quantifier.ConsumingStrategy.NOT_FOLLOW" is there
something wrong 




--
Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/