RFR: 8331189: Implementation of Scoped Values (Third Preview)

[ExE Boss]

On Wed, 8 May 2024 09:40:38 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> JEP 481 proposes Scoped Values to continue to preview in JDK 23 with one change. The type of the operation parameter of the callWhere method is changed to a new functional interface to avoid having the API throw Exception. With that change, the getWhere (and the corresponding method on Carrier) are no longer needed. The functional interface is not proposed for j.u.function at this time.

src/java.base/share/classes/java/lang/ScopedValue.java line 500:

> 498:     @PreviewFeature(feature = PreviewFeature.Feature.SCOPED_VALUES)
> 499:     @FunctionalInterface
> 500:     public interface CallableOp<T, X extends Throwable> {

I feel like that a functional interface such as this one should be promoted to a top‑level type in some common package by the time this feature exits preview.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19136#discussion_r1596041552