Optimizations and cleanup for the JRuby extension #708
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This improves performance by having fewer dynamic writes.
This eliminates the context field on ParserSession, ByteListTranscoder, and Generator.Session as well as accesses of the runtime through it. These runtime structures should generally be passed on the stack rather than being stored into long-lived objects, even if they may be GCed quickly.
It's more efficient to compare the Encoding object and for the rare cases where we need to transcode to UTF-8 just look it up again.
Rarely used, mostly at boot, and probably just as quick to look up the constant as go through the weak reference.
Previous logic would only pass the string through if its encoding was exactly UTF-8. New logic passes through UTF-8 and US-ASCII and handles other encodings like CRuby.
Using an output stream here is just added overhead compared to writing directly to a ByteList. Instead, we move the OutputStream logic into StringEncoder and restore direct ByteList writing to StringDecoder.
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This is done and ready for review. @byroot let me know if you have any concerns. |
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I don't have much Java expertise, so feel free to merge if you're ready. |
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