[jira] [Reopened] (BEAM-2021) Fix Java's Coder class hierarchy

["Thomas Groh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Groh reopened BEAM-2021:
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There's a bit more work I'd like to get done, mainly splitting the class hierarchy out away from "everything in the SDK is a structured coder". 

> Fix Java's Coder class hierarchy
> --------------------------------
>
>                 Key: BEAM-2021
>                 URL: https://issues.apache.org/jira/browse/BEAM-2021
>             Project: Beam
>          Issue Type: Improvement
>          Components: beam-model-runner-api, sdk-java-core
>    Affects Versions: First stable release
>            Reporter: Kenneth Knowles
>            Assignee: Thomas Groh
>             Fix For: First stable release
>
>
> This is thoroughly out of hand. In the runner API world, there are two paths:
> 1. URN plus component coders plus custom payload (in the form of component coders alongside an SdkFunctionSpec)
> 2. Custom coder (a single URN) and payload is serialized Java. I think this never has component coders.
> The other base classes have now been shown to be extraneous: they favor saving ~3 lines of boilerplate for rarely written code at the cost of readability. Instead they should just be dropped.
> The custom payload is an Any proto in the runner API. But tying the Coder interface to proto would be unfortunate from a design perspective and cannot be done anyhow due to dependency hell.



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