[jira] [Reopened] (FLINK-3414) Add Scala DSL for CEP's pattern definition

["Konstantin Knauf (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Knauf reopened FLINK-3414:
-------------------------------------

Re-opening in accordance with https://issues.apache.org/jira/browse/FLINK-23206.

> Add Scala DSL for CEP's pattern definition
> ------------------------------------------
>
>                 Key: FLINK-3414
>                 URL: https://issues.apache.org/jira/browse/FLINK-3414
>             Project: Flink
>          Issue Type: Improvement
>          Components: Library / CEP
>    Affects Versions: 1.0.0
>            Reporter: Till Rohrmann
>            Priority: Minor
>              Labels: auto-closed
>
> Currently, the CEP library only supports a Java API to specify complex event patterns. In order to make it a bit less verbose for Scala users, it would be nice to also add a Scala API for the CEP library. 
> A Scala API would also allow to pass Scala's anonymous functions as filter conditions or as a select function, for example, or to use partial functions to distinguish between different events.
> Furthermore, the Scala API could be designed to feel a bit more like a DSL:
> {code}
> begin "start" where _.id >= 42 -> "middle_1" as classOf[Subclass] || "middle_2" where _.name equals "foobar" -> "end" where x => x.id <= x.volume
> {code}



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