enable 'deduplicateObjects' via Annotation?

[Mark Struberg <st...@yahoo.de.INVALID>]

Hi folks!

First of all, what does 'deduplicateObjects' do?

When switched on, it will effectively serialise any Object (other than a native or a JsonValue) only once.
Any further occurence in the Object-graph will be serialised as JsonPointer.

Person sarah = new Person("Sarah");
Person clemens = new Person("Clemens");
clemens.setMother(sarah);
Person[] family = new Person[]{sarah, clemens};

Transformed to JSON this will now look like the following:
[{"name":"Sarah"},{"name":"Clemens","mother":"/0"}]

Notice the "/0" which is a JsonPointer to Sarah.


Sometimes it's not feasible to enable the 'deduplicateObjects' feature on a general base.
E.g. when used with JsonB in JAX-RS we probably only want to use it when serialising a few specific objects.

Should we somehow support toggling this feature via an Annotation?
And how does this look like?

I think we don't need to ship this for 1.1.4, but we should take a bit time and look at it from a broader perspective.

This feature can now be enabled via 
MapperBuilder#setDeduplicateObjects(true);
ConfigurableJohnzonProvider for JAX-RS and
JsonbConfig.setProperty("johnzon.deduplicateObjects", true);

I think we're good to go for 1.1.4 and then improve with the annotation driven idea later on.

LieGrue,
strub

Re: enable 'deduplicateObjects' via Annotation?

[Romain Manni-Bucau <rm...@gmail.com>]

+0


Romain Manni-Bucau
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2017-09-26 14:25 GMT+02:00 Mark Struberg <st...@yahoo.de.invalid>:

> Hi folks!
>
> First of all, what does 'deduplicateObjects' do?
>
> When switched on, it will effectively serialise any Object (other than a
> native or a JsonValue) only once.
> Any further occurence in the Object-graph will be serialised as
> JsonPointer.
>
> Person sarah = new Person("Sarah");
> Person clemens = new Person("Clemens");
> clemens.setMother(sarah);
> Person[] family = new Person[]{sarah, clemens};
>
> Transformed to JSON this will now look like the following:
> [{"name":"Sarah"},{"name":"Clemens","mother":"/0"}]
>
> Notice the "/0" which is a JsonPointer to Sarah.
>
>
> Sometimes it's not feasible to enable the 'deduplicateObjects' feature on
> a general base.
> E.g. when used with JsonB in JAX-RS we probably only want to use it when
> serialising a few specific objects.
>
> Should we somehow support toggling this feature via an Annotation?
> And how does this look like?
>
> I think we don't need to ship this for 1.1.4, but we should take a bit
> time and look at it from a broader perspective.
>
> This feature can now be enabled via
> MapperBuilder#setDeduplicateObjects(true);
> ConfigurableJohnzonProvider for JAX-RS and
> JsonbConfig.setProperty("johnzon.deduplicateObjects", true);
>
> I think we're good to go for 1.1.4 and then improve with the annotation
> driven idea later on.
>
> LieGrue,
> strub
>
>