On Fri, 25 Mar 2022 15:17:02 GMT, Stephen Colebourne <scolebou...@openjdk.org>
wrote:
>> Claes Redestad has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> Add nanoOfSecond parameter, make micro less reliant on constants
>
> src/java.base/share/classes/java/time/ZoneOffset.java line 512:
>
>> 510: @Override
>> 511: /* package-private */ ZoneOffset getOffset(long epochSecond, int
>> nanoOfSecond) {
>> 512: return this;
>
> An alternate approach would be for `ZoneOffset` to cache the instance of
> `ZoneRules` either on construction or first use (racy idiom would be OK).
> That way this issue is solved for the many different places that call
> `zoneId.getRules()`.
Why not both? I measured an improvement using that alone, but specifically
avoiding going via getRules is faster still (without adversely affecting
`ZoneRegion` paths). I've added the cache in `ZoneOffset`, along with an
override of `ZoneId::normalized` in `ZoneOffset` to shortcut the `getRules`.
-------------
PR: https://git.openjdk.java.net/jdk/pull/7957
