Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2367#discussion_r75496232
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/pattern/Pattern.java
---
@@ -129,6 +141,23 @@ public Time getWindowTime() {
}
/**
+ * Set a matching behaviour that defines if the same event can be used
in multiple matching sequences.
+ *
+ * @param matchingBehaviour New matching behaviour
+ * @return The same pattern operator with the specified matching
behaviour
+ */
+ public Pattern<T, F> matchingBehaviour(MatchingBehaviour
matchingBehaviour) {
+
+ Pattern<T, F> pattern = this;
+ while (pattern != null) {
+ pattern.matchingBehaviour = matchingBehaviour;
+ pattern = (Pattern<T, F>) pattern.getPrevious();
+ }
+
+ return this;
--- End diff --
Looking at the necessary implementation to wire the matching behaviour
through all `Pattern` instances, I wonder whether the `MatchingBehaviour`
should rather be given to the `CEP.pattern` call. There it could be given to
the generated `NFA` which is responsible for making sure that the behaviour is
respected. The API would then look like:
`CEP.pattern(input, pattern, matchingBehaviour)`
What do you think?
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