RFR: 8266846: Add java.time.InstantSource

[Rémi Forax]

On Mon, 17 May 2021 07:31:45 GMT, Stephen Colebourne <scolebourne at openjdk.org> wrote:

>> src/java.base/share/classes/java/time/InstantSource.java line 93:
>> 
>>> 91:  * @since 17
>>> 92:  */
>>> 93: public interface InstantSource {
>> 
>> Should not we add `@FunctionalInterface`? I can easily imagine this interface being used in tests where we can define the `InstantSource` with lambdas.
>
> `@FunctionalInterface` isn't required for use by lambdas. I wasn't initially convinced using it here was the right choice.

Right, it's about signaling that it's safe to be used with a lambda/method-reference, so it's not required but a nice to have, very like @Override.

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