Re: [cdi-dev] adding generic producers to CDI 2.0?
I think that would need a multi-pass ‚coercion‘ like it’s done in the jvm.
Currently it’s a getBeans(type) (+ resolve).
And after that only a single candidate must be left.
To support your desired case we would need to do a ’nearest’ search means if you have the
following producers
@Produces List<String> ..
@Produces List<?> ..
@Produces Object ..
@Inject List<String> x; // first producer would be taken
@Inject List<Integer> x; // second producer would be taken
@Inject BlaBla x; // third producer would be taken;
We’ve discussed similar things back then in CDI-304 I think.
Of course that would only work if the producer has a chance to inspect the injection
point. Means those producers would need to be @Dependent I guess?
Do we go down this route? Or is this an overkill? No idea yet… Might be very powerful but
maybe also very fragile?
LieGrue,
strub
Am 12.02.2016 um 17:56 schrieb Romain Manni-Bucau
<rmannibucau(a)gmail.com>:
Hi guys,
could CDI 2 do step forward for generic producers?
The need is to produce any type (with a particular qualifier) without the need of an
extension:
@Produces
@MyQualifier
Object create(InjectionPoint ip) { ... }
This is actually a common pattern (for configuration, or to integrate with 3rd party
libs) and today the only hope to do so is to write an extension which is a bit technical
and verbose for the result IMO.
I guess for compatibility reason we would need to do something like:
@Produces
@MyQualifier
@Generic
Object create(InjectionPoint ip) { ... }
and say that if there is a unique resolved bean thanks to qualifiers which is annotated
@Generic then use this producer.
wdyt?
Romain Manni-Bucau
@rmannibucau | Blog | Github | LinkedIn | Tomitriber
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