<i18n dev> RFR: 8261254: Initialize charset mapping data lazily

[Claes Redestad]

On Mon, 8 Feb 2021 17:40:00 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This patch refactor JDK internal charsets to initialize charset mapping data lazily when needed via holder classes. This means both a startup improvement in some cases, and possible throughput improvements for all DoubleByte-based Charsets.
>> 
>> Testing: tier1-3
>
> Looks good to me. I initially thought of the same impression as Alan's, i.e., enumerating all charsets is not that common (in fact, same applies to Locale, and I once explored usages and it ended all up in test cases), but if real apps are using it, this is the right way to do so.

Thanks for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/2449