Re: [Resteasy-developers] Revisiting custom content type negotiation

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I came to the conclusion earlier we needed a few different types of 
interceptors.

1. wrapping the resource method
2. wrapping the request (like Filters)
3. and maybe wrapping response marshalling

I only implemented #1 in a private API.

Solomon Duskis wrote:
> There's a set/getMediaTypeMappings in SynchronousDispatcher.  That's 
> used to transform an extention (.xml) into an accept header 
> ("application/xml").  There's a similar notion for languageMappings.  It 
> shouldn't be too difficult to add in a HttpRequestInterceptor that could 
> be registered with the Dispatcher.
> 
> That would reduce some clutter in SynchronousDispatcher, and also allow 
> some other clever processing to occur, like a queryParam affecting the 
> accept-header.
> 
> What do you think?
> 
> -Solomon
> 
> On Fri, Dec 5, 2008 at 7:51 PM, Ryan J. McDonough <ry...@da... 
> <mailto:ry...@da...>> wrote:
> 
>     What I sent is indeed ugly, but that's one way you'd do custom content
>     negotiation in JAX-RS. However, my point was that code like could be
>     leveraged/refactored into some type of SPI. My issue with how JAX-RS
>     does it that feels like boiler plate code that really could be
>     refactored into something more cohesive.
> 
>     However, if your existing service only takes a query parameter to
>     distinguish media types, I'm not sure this is something that belongs
>     in JAX-RS or RESTEasy. If we expose a query parameter as a means to
>     perform content negotiation, we're now placing some limits on what
>     query parameter names can be used by applications. On the surface,
>     this sounds like more an application design challenge than an issue
>     with content negotiation. You could build an internal map of format
>     value which map to mime types. From there, you can a
>     MessageBodyWorkers to look up the appropriate provider.
> 
>     But again, if we can come up with an SPI that can you can plug this
>     into, you'd be free to plug this in and I am in favor of the idea of
>     such an SPI post 1.0.
> 
> 
> 
>     Ryan-
> 
> 
> 
>     On Dec 5, 2008, at 4:54 PM, Edelson, Justin wrote:
> 
>      > There's an existing service that uses ?format=XXX as a query string
>      > that
>      > would be nice to port to JAX-RS. The format values are NOT straight
>      > mime-types, more like the way you have the ability to alias mime
>     types
>      > to names in the existing resteasy.media.type.mappings functionality:
>      > atom : application/xml+atom
>      > mrss : text/xml
>      > html : text/html
>      >
>      > etc. etc. etc.
>      >
>      > I'll have to look into the Variant stuff that Ryan mentioned, but
>     that
>      > looked pretty ugly to me.
>      >
>      > Justin
>      >
>      > -----Original Message-----
>      > From: Bill Burke [mailto:bb...@re...
>     <mailto:bb...@re...>]
>      > Sent: Friday, December 05, 2008 4:33 PM
>      > To: Edelson, Justin
>      > Cc: res...@li...
>     <mailto:res...@li...>
>      > Subject: Re: [Resteasy-developers] Revisiting custom content type
>      > negotiation
>      >
>      > No there is not a way to plug in custom negotiation.  Can you explain
>      > your need for it?  Your use case?  It would help to formulate an SPI.
>      >
>      > Edelson, Justin wrote:
>      >> There was a brief thread at the end of October about allowing for
>      >> custom content type negotiation. The outcome was that the
>      >> extension-based content-type selection feature would be documented.
>      >> This is great, but I wonder if we can revisit the initial question -
>      >> is there a way to allow for custom content type negotiation
>      >> strategies
>      > to be plugged into Resteasy?
>      >>
>      >> Justin Edelson
>      >> VP, Platform Engineering
>      >> MTV Networks Digital
>      >>
>      >>
>      >>
>      >>
>      >>
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