users@jax-rs-spec.java.net

[jax-rs-spec users] [jsr339-experts] Re: Re: Re: Why is Reader/WriterInterceptor generic?

From: Sergey Beryozkin <sberyozkin_at_talend.com>
Date: Thu, 2 Feb 2012 21:54:43 +0000

On 02/02/12 21:44, Santiago Pericas-Geertsen wrote:
>
> On Feb 2, 2012, at 4:34 PM, Sergey Beryozkin wrote:
>
>> Hi
>> On 02/02/12 21:16, Santiago Pericas-Geertsen wrote:
>>>
>>> On Feb 2, 2012, at 12:56 PM, Marek Potociar wrote:
>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 2/1/12 12:17 PM, Marek Potociar wrote:
>>>>>>>>>> I would prefer to make it not generic. (Alas we can't do the same for MBR/MBW...)
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> well, it makes sense on MBR/MBW cuz the generic type could be used to break ties when matching.
>>>>>>>>>
>>>>> There definitely has to be a step there that for ensure for example that if both MyMessageBodyReader<A> and
>>>>> MyMessageBodyReader<B> are selected where B extends A then it's MyMessageBodyReader<B> that gets selected
>>>>>
>>>>
>>>> Don't tell me it is there - send me a pointer to the spec text. :)
>>>>
>>>> FWIW, my understanding is that the precedence of entity providers is *CURRENTLY* based only on 2 aspects:
>>>>
>>>> - custom providers (i.e. the ones returned by Application.getClasses/Singletons) take precedence over the default ones
>>>> - compatibility of entity media type with the media type(s) declared in @Produces/_at_Consumes on the provider
>>>>
>>>> Once the providers are ordered based on the above, first provider that returns true from isReadable/isWritable is selected.
>>>
>>> According to the spec: MBRs are sorted on media type (Section 4.2.1) and MBWs are sorted on media type _and_ generic type (Section 4.2.2). Note sure why the lack of symmetry here
>>>
>> I can see it too in http://jcp.org/aboutJava/communityprocess/maintenance/jsr311/311changelog.1.1.html
>>
>> It's simply a minor spec bug.
>
> You mean that the search mechanism for MBRs does not use generic types?

I meant the spec should've clearly specified that MBRs should be sorted
the same way MBWs are. So yes, the fact the search mechanism for MBRs
does not use generic types is a minor spec issue

Cheers, Sergey

>
> -- Santiago
>


-- 
Sergey Beryozkin
Talend Community Coders
http://coders.talend.com/
Blog: http://sberyozkin.blogspot.com