New candidate JEP: 506: Scoped Values

[David Alayachew]

Folks, saying that you tried the feature in earnest on a non-trivial
project, and everything went as expected is VALUABLE feedback. Therefore,
don't hesitate to share your experience!


Only thing I'd change is that you give a brief overview of your project,
and an example of how specifically you used the JEP. That is the ideal form
of feedback, even if the feedback boils down to "went as expected".

On Tue, Apr 15, 2025, 11:10 AM Davor Hrg <hrgdavor at gmail.com> wrote:

> That is exactly the use-case I was going for in my tests, but have not
> been able to test it in a high traffic environment.
>
> Api itself is fine, nothing to report.
>
>
>
>
> On Tue, Apr 15, 2025 at 4:51 PM Josiah Noel <josiahnoel at gmail.com> wrote:
>
>> I suppose I'm just not sure what feedback to give beyond it works like I
>> thought it would. I've been using it in one of our high traffic APIs since
>> java 21. Currently the service is on JDK 24 and I haven't noticed any
>> problems with the preceding java versions either.
>>
>> I use it to store request data that would otherwise be put in an MDC
>> context. I then have a custom logback encoder which extracts the values and
>> put them into the json log statement.
>>
>> On Tue, Apr 15, 2025, 10:16 AM David Alayachew <davidalayachew at gmail.com>
>> wrote:
>>
>>> Correct
>>>
>>> On Tue, Apr 15, 2025, 8:59 AM Davor Hrg <hrgdavor at gmail.com> wrote:
>>>
>>>> Am I reading this correctly?
>>>>
>>>> Does this mean Scoped Values will be fully available (not hidden behind
>>>> the preview flag) in Java 25 ?
>>>>
>>>>
>>>>
>>>> On Mon, Apr 14, 2025 at 9:43 PM Mark Reinhold <mark.reinhold at oracle.com>
>>>> wrote:
>>>>
>>>>> https://openjdk.org/jeps/506
>>>>>
>>>>>   Summary: Introduce scoped values, which enable a method to share
>>>>>   immutable data both with its callees within a thread, and with child
>>>>>   threads.  Scoped values are easier to reason about than thread-local
>>>>>   variables.  They also have lower space and time costs, especially
>>>>> when
>>>>>   used together with virtual threads (JEP 444) and structured
>>>>> concurrency
>>>>>   (JEP 505).
>>>>>
>>>>> - Mark
>>>>
>>>>
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