boyuanzz commented on a change in pull request #12016:
URL: https://github.com/apache/beam/pull/12016#discussion_r449734236
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File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/reflect/DoFnInvoker.java
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@@ -95,7 +96,8 @@ void invokeOnTimer(
void invokeSplitRestriction(ArgumentProvider<InputT, OutputT> arguments);
/** Invoke the {@link TruncateRestriction} method on the bound {@link DoFn}.
*/
- void invokeTruncateRestriction(ArgumentProvider<InputT, OutputT> arguments);
+ <RestrictionT> Optional<RestrictionT> invokeTruncateRestriction(
Review comment:
My intent was to use `Optional.empty()` to represent there is no more
work. So we could have 2 options:
1. Use `Optional.empty()` as a notion of no more remaining work and use
`Optional.of(value)` as a notion of bounded remaining work.
2. Change the function signature to `@Nullable RestrictionT
truncateRestriction()`, where `null` means no more work.
I don't have a strong preference over these 2 options. But 2 is more
consistent with python.
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