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https://issues.apache.org/jira/browse/FLINK-3703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428296#comment-15428296
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ASF GitHub Bot commented on FLINK-3703:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2367#discussion_r75495772
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/State.java ---
@@ -38,10 +40,16 @@
private final String name;
private final StateType stateType;
private final Collection<StateTransition<T>> stateTransitions;
+ private final MatchingBehaviour matchingBehaviour;
--- End diff --
The `State` shouldn't have to know the `MatchingBehaviour`. They should be
agnostic to the matching behaviour.
> Add sequence matching semantics to discard matched events
> ---------------------------------------------------------
>
> Key: FLINK-3703
> URL: https://issues.apache.org/jira/browse/FLINK-3703
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.0.0, 1.1.0
> Reporter: Till Rohrmann
> Assignee: Ivan Mushketyk
> Priority: Minor
>
> There is no easy way to decide whether events can be part of multiple
> matching sequences or not. Currently, the default is that an event can
> participate in multiple matching sequences. E.g. if you have the pattern
> {{Pattern.<Event>begin("a").followedBy("b")}} and the input event stream
> {{Event("A"), Event("B"), Event("C")}}, then you will generate the following
> matching sequences: {{Event("A"), Event("B")}}, {{Event("A"), Event("C")}}
> and {{Event("B"), Event("C")}}.
> It would be useful to allow the user to define where the matching algorithm
> should continue after a matching sequence has been found. Possible option
> values could be
> * {{from first}} - continue keeping all events for future matches (that is
> the current behaviour)
> * {{after first}} - continue after the first element (remove first matching
> event and continue with the second event)
> * {{after last}} - continue after the last element (effectively discarding
> all elements of the matching sequence)
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