[ScopedValue] best way to conditionally bind a value ?

[Davor Hrg]

I personally would try this variant,

Carrier carrier = ScopedValue.where( USER_ID, uid );
if( acceptLanguage == null ) {
    carrier = carrier.where( ACCEPT_LANGUAGE, acceptLanguage );
}
carrier.call( MyClass::myStaticCallableMethod );

br,
Davor Hrg


On Wed, Jul 30, 2025 at 8:18 PM Benoit LEFEVRE -CAMPUS- <
benoit.lefevre at decathlon.com> wrote:

> Hello
>
> After using the ScopedValue for a few days, I'm wondering if there is a
> better way to conditionally bind a value than doing the following :
>
>
> public static final ScopedValue< Locale > ACCEPT_LANGUAGE =
> ScopedValue.newInstance();
> public static final ScopedValue< String > USER_ID =
> ScopedValue.newInstance();
>
> final Locale acceptLanguage = getAcceptLanguageFromHeader( httpRequest );
>
>
> if( acceptLanguage == null ) {
>     ScopedValue
>         .where( USER_ID, uid )
>         .call( MyClass::myStaticCallableMethod );
> } else {
>     ScopedValue
>         .where( USER_ID, uid )
>         .where( ACCEPT_LANGUAGE, acceptLanguage )
>         .call( MyClass::myStaticCallableMethod );
> }
>
>
> The point for me of doing so, instead of simply setting a null
> acceptLanguage, is to have a more readable code afterward :
>
>
> private String myStaticCallableMethod() {
>     final Local localToUse = ACCEPT_LANGUAGE.orElse( A_DEFAULT_LOCAL );
>
>
>     ...
> }
>
>
> What is your advise about it ?
>
>
> Best regards
>
> --
> Benoit Lefèvre
>
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