youngoli commented on issue #11257: [BEAM-9642] Create runtime invokers for SDF methods. URL: https://github.com/apache/beam/pull/11257#issuecomment-606366621 R: @lostluck Ready for an actual review. It should be much more optimized now. I have a call function so the code won't repeatedly hit the switch statements, and I have a cache for input elements (which is skipped altogether if the user generated code anyway). I did consider ways I could use the existing invoker code, but there were so many places that assumed a normal DoFn was being used that it would be very difficult to use it without doing a good amount of refactoring. I think if the regular DoFn methods and the SDF methods ever get a standardized format for their signatures that covers both of them, then we can easily combine it, but until then I think this is preferable. Only other part I was debating was whether it was worth trying to find a way to have one single sdfInvoker instead of a separate invoker for each method. Ultimately I felt like it was a lot of extra work to avoid a little bit of duplication (only the Invoke and Reset methods could be deduplicated, the initCallFn methods would still be 4 different methods).
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