Where does this array come from ?

[Mateusz Romanowski]

Hi,
Could we allow record classes to extend abstract stateless classes (same as
in valhalla) that also extend java.lang.Record.

I think that such functionality is needed (at least in JVM view) for inline
records.

Should it also be made available to non-inline records?

Thanks,
Mateusz



On Tuesday, April 7, 2020, Remi Forax <forax at univ-mlv.fr> wrote:
> Create an an interface with a default method toJSON().
>
> interface DeriveJSON {
>   public default String toJSON() {
>     // use an object mapper or whatever you want here
>   }
> }
>
> so when you want a Point with a method toJSON(), you can write
>   record Point(x, y) implements DeriveJSON { }
>
> With a little work, you can make toJSON to use a polymorphic inlining
cache (good for benchmark) and with the upcoming hidden classes have a
constant cost if it becomes megamorphic without generating bytecode.
>
> Rémi
>
> ----- Mail original -----
>> De: "Stephen Colebourne" <scolebourne at joda.org>
>> À: "amber-dev" <amber-dev at openjdk.java.net>
>> Envoyé: Lundi 6 Avril 2020 15:45:48
>> Objet: Re: Where does this array come from ?
>
>> FWIW, a colleague has previously argued that the toString of a bean
>> should be JSON. At a company he worked at, all their beans were JSON
>> and it apparently allowed them to build tooling on top of the
>> toString. I'm not sure I'm convinced about JSON, but I do think a
>> record is closer to a map than a list. And yes, Joda-Beans uses {} not
>> [].
>> Stephen
>>
>>
>> On Mon, 6 Apr 2020 at 14:01, Brian Goetz <brian.goetz at oracle.com> wrote:
>>>
>>> Perhaps we should rotate the punctuation every version just to
discourage
>>> parsing :)
>>>
>>> > On Apr 6, 2020, at 7:34 AM, Remi Forax <forax at univ-mlv.fr> wrote:
>>> >
>>> > I've was debugging a code yesterday that was printing
>>> >  Empty[]
>>> >
>>> > After some head scratching, trying to find an array of Empty, i found
that it
>>> > was just an empty record
>>> >  record Empty() { }
>>> >
>>> > This is another clue that using square brackets for toString() is a
bad idea !
>>> >
>>> > regards,
>>> > Rémi
>