RFR: 8266846: Add java.time.InstantSource

[Stephen Colebourne]

On Thu, 13 May 2021 20:52:33 GMT, Stephen Colebourne <scolebourne at openjdk.org> wrote:

> 8266846: Add java.time.InstantSource

It would good to get confirmation in the review from @dholmes-ora or Mark Kralj-Taylor that my changes to the precise system clock are correct. Specifically, I moved the code from instance to static. I don't believe this changes the thread-safety, but it does need double checking (there was no discussion in the original thread concerning instance vs static).

Original thread: http://mail.openjdk.java.net/pipermail/core-libs-dev/2020-May/066670.html

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PR: https://git.openjdk.java.net/jdk/pull/4016