Explicit discussion about generics and ioc eludes me on that page - but I'll
keep looking around.
Thanks.
-Luther
On Wed, Mar 4, 2009 at 7:01 PM, Thiago H. de Paula Figueiredo <
thiag...@gmail.com> wrote:
> Em Wed, 04 Mar 2009 21:47:31 -0300, Luther Baker <lutherba...@gmail.com>
> escreveu:
>
> Can I safely @Inject this encoder into multiple/different pages?
>> class MoviePage
>> {
>> @Inject
>> private ValueEncoder<Movie> encoder;
>>
>
> Java does not let you do that because of the way it implemented generics.
> Anyway, Select (and maybe some other components) use ValueEncoderSource to
> get a ValueEncoder for a given type. Take a look at
> TapestryModule.contributeValueEncoderSource().
>
> If this is safe, although I only bound one instance, does it create a new
>> instance of the service for each Generic<Parameter> type?
>>
>
> It wouldn't work like you want.
>
> What should happen with something like this:
>> binder.bind(AbstractSelectModel.class, GenericSelectModel.class);
>> when there is no "left-hand" Generic to infer the Generic Parameter from:
>> class VideoPage
>> {
>> @Inject
>> private AbstractSelectModel model;
>>
>
> I guess this would work. But I suggest you to use
> binder.bind(GenericSelectModel.class) (without the "left-hand") and then
> @Inject it like any other service.
>
> This is a purely Tapestry-IoC thing, not exactly a Tapestry-Core (web
> framework) issue. You can read more about injection and services at
> http://tapestry.apache.org/tapestry5/tapestry-ioc/service.html. I'm just
> parroting what's written there. :)
>
> --
> Thiago H. de Paula Figueiredo
> Independent Java consultant, developer, and instructor
> http://www.arsmachina.com.br/thiago
>
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