[jira] [Created] (FLINK-3216) Define pattern specification

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-3216:
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             Summary: Define pattern specification
                 Key: FLINK-3216
                 URL: https://issues.apache.org/jira/browse/FLINK-3216
             Project: Flink
          Issue Type: Sub-task
            Reporter: Till Rohrmann


In order to detect event patterns we first have to define the pattern. This issue tracks the progress of implementing a user facing API to define event patterns. 

Patterns should support the following operations

* next(): The given event has to follow directly after the preceding event
followedBy(): The given event has to follow the preceding event. There might occur other events in-between
* every(): In a follow-by relationship a starting event can be matched with multiple successive events. Consider the pattern a → b where → denotes the follow-by relationship. The event sequence a, b, b can be matched as a, b or a, (b), b where the first b is left out. The essential question is whether a is allowed to match multiple times or only the first time. The method every specifies exactly that. Every events in a pattern can match with multiple successive events. This makes only sense in a follow-by relationship, though.
* followedByEvery(): Similar to followedBy just that the specified element can be matched with multiple successive events
* or(): Alternative event which can be matched instead of the original event: every(“e1”).where().or(“e2”).where()
* within(): Defines a time interval in which the pattern has to be completed, otherwise an incomplete pattern can be emitted (timeout case)



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