[jira] [Created] (FLINK-19176) Support ScalaPB as a message payload serializer in Stateful Functions

[Shang Yuanchun (Jira)]

Galen Warren created FLINK-19176:
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             Summary: Support ScalaPB as a message payload serializer in Stateful Functions
                 Key: FLINK-19176
                 URL: https://issues.apache.org/jira/browse/FLINK-19176
             Project: Flink
          Issue Type: Improvement
          Components: Stateful Functions
    Affects Versions: 2.0.0
            Reporter: Galen Warren
             Fix For: statefun-2.1.0


Currently, Stateful Functions supports four options for serialization of message payloads:
 * Protobuf (based on code generated for Java)
 * Kryo
 * Multilanguage 
 * Raw

This proposal is to add a fifth option to this list, to support serialization of message payloads based on [ScalaPB|[https://scalapb.github.io/docs/]]. This would allow Scala developers to use ScalaPB-generated classes as message types in Stateful Functions directly as message types, without having to convert to/from code generated for Java and/or raw byte[] messages.

This would be a simple implementation, as there is already a [MessagePayloadSerializer |[https://github.com/apache/flink-statefun/blob/8ffe619a94917d676cf1054c8a0e60de544663db/statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/message/MessagePayloadSerializer.java]] interface that is implemented for each of the existing serialization methods; supporting ScalaPB would require a new class implementing MessagePayloadSerializer in terms of ScalaPB-generated code, and a means to select it, by adding a new value to the [MessageFactoryType |[https://github.com/apache/flink-statefun/blob/8ffe619a94917d676cf1054c8a0e60de544663db/statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/message/MessageFactoryType.java]]enumeration. Plus testing :)

I've done this already locally, the implementation is very similar to the existing [MessagePayloadSerializerPb |[https://github.com/apache/flink-statefun/blob/8ffe619a94917d676cf1054c8a0e60de544663db/statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/message/MessagePayloadSerializerPb.java]]implementation. It uses a reference to ScalaPB in "provided" scope.

Would you be interested in a pull request to add this? Primary benefit is to make it easy to use Stateful Functions in a Scala environment. Thanks.

 

 

 

 

 



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