<i18n dev> RFR: 8335791: Speed ​​up j.u.Formatter & String.format [v2]

[Shaojin Wen]

On Fri, 5 Jul 2024 18:56:58 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request incrementally with four additional commits since the last revision:
>> 
>>  - use unknownFormatConversion method construct UnknownFormatConversionException
>>  - uppercase static final field name & code format
>>  - add stable annotation
>>  - replace cast to pattern matching
>
> src/java.base/share/classes/java/lang/String.java line 4548:
> 
>> 4546:     }
>> 4547: 
>> 4548:     private static class StringFormat {
> 
> Since we want to avoid new classes on startup, we should change the lazy initialization pattern to:
> 
> 
> private static @Stable JavaUtilFormatterAccess jufa;
> private static JavaUtilFormatterAccess formatterAccess() {
>     var access = jufa;
>     if (access = null) {
>         // We can assert not null on the getJUFA result
>         return jufa = SharedSecrets.getJavaUtilFormatterAccess();
>     }
>     return access;
> }
> 
> using benign race.

I found out through `-verbose:class` that StringFormat is not in the class loaded by startup

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PR Review Comment: https://git.openjdk.org/jdk/pull/20055#discussion_r1667120045