Kenneth Knowles created BEAM-1786:
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Summary: AutoService registration of coders, like we do with
PipelineRunners
Key: BEAM-1786
URL: https://issues.apache.org/jira/browse/BEAM-1786
Project: Beam
Issue Type: Improvement
Components: sdk-java-core
Reporter: Kenneth Knowles
Today, registering coders for auxiliary data types for a library transform is
not very convenient. It the appears in an output/covariant position then it
might be possible to use {{getDefaultOutputCoder}} to solve things. But for
writes/contravariant positions this is not applicable and the library transform
must contort itself to avoid requiring the user to come up with a coder for a
type they don't own.
Probably the best case today is an explicit call to
{{LibraryTransform.registerCoders(Pipeline)}} which is far too manual.
This could likely be solved quite easily with {{@AutoService}} and a static
global coder registry, as we do with pipeline runners.
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