RFR: 8361018: Re-examine buffering and encoding conversion in BufferedWriter [v6]

[Shaojin Wen]

On Tue, 1 Jul 2025 00:41:03 GMT, Xueming Shen <sherman at openjdk.org> wrote:

> While I understand the motivation behind the PR, it's a bit challenging, as a reviewer :-) to review a change that is essentially to 'break' the abstraction layer by surfacing a lower-level implementation to the top API solely for performance gains. Maybe it's easier to add an impl note to suggest "it's no longer always a good idea to put a buffered writer on top of an osw", for example.
> 
> It might be better to separate the 'backdoor UTF-8 path' optimization and the 'skip BufferedWriter' change as a first step to start the discussion?

After the introduction of JEP 254 Compact Strings, many java.io-related codes need to be optimized for Compact Strings. If we plan to remove the option COMPACT_STRING = off, we should do these optimizations before that.

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PR Comment: https://git.openjdk.org/jdk/pull/26022#issuecomment-3021532618