m-trieu opened a new pull request, #28755:
URL: https://github.com/apache/beam/pull/28755
Cleaning up of StateFetcher
Changes will need to be made to this (or possibly just make a new class that
takes in a WindmillWorkItemClient instead of MetricTrackingWindmillServer to
make GetData calls) to support direct path, so doing some clean up before
introducing further changes in a later CLs.
- Changed to not use `null` as a valid state. Current `null` was being used
to represent the side input not being ready along side with `Optional<T>`, so
the interface was returning a `@Nullable Optional<T>`. Opted to expose the the
`SideInput` instance directly, and checking for `ready` state instead of `null`.
- some autoformatting was applied by the linter and spotless
- move the `StateFetcher` into its own directory under
`/streaming/sideinput` for organization
R: scwhittle
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