Re: What about GrlMedia resolving?

[Guilhem Bonnefille <guilhem bonnefille gmail com>]

2014-11-13 10:11 GMT+01:00 Juan A. Suarez Romero <jasuarez igalia com>:
> On Wed, 2014-11-12 at 22:15 +0100, Guilhem Bonnefille wrote:
> > If someone can point me a good documentation on the role of the grilo
> > resolve function... it will help me to decide if I have to provide
> > such function in my plugin, or if I don't.
>
> resolve() function is used to provide information about metadata keys
> that weren't asked before in a browse/search operation.
>
> For example, a client could request in a search operation about "title"
> and "author". So source would be returning only that information.
>
> If later the client wants to show a new field, like "thumbnail", for a
> specific media, it would use resolve() and ask for "thumbnail".
>
> Let's show a different but real example. You want to show in a grid the
> results from searching all Videos in YouTube. Specifically, you want to
> show a thumbnail and a title below.
>
> So you ask Grilo for both fields, plus URL for further playing. But, in
> order to be as faster as possible, you use the GRL_RESOLVE_FAST_ONLY
> flag, which makes the Grilo to drop those fields that could make the
> query too much slow.
>
> In the case of YouTube, asking for URL makes the search/browse slow, so
> Grilo will drop that key: the results you ask for only contain thumbnail
> and title. No problem. You show the content, and user clicks on video to
> play it. Well, you realize you don't have URL, so you use resolve() to
> ask for URL in that case.
>
>
> So in summary, if you don't provide resolve() it means the clients only
> can get the required fields in the browse or search operations. They
> can't ask later for the fields that weren't asked before.

Thanks for these informations. I totally missed the GrlKeyId list. I
have significant change to do on my plugin before proposing it for
inclusion.

Thanks again.
-- 
Guilhem BONNEFILLE
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