[Engine-devel] Dynamic resource loading in GWT

[Einav Cohen]

Hi Roy,

a couple of notes (I could be totally wrong here, GWT experts - please review/comment):

- from [1]:
"Provides dynamic string lookup of key/value string pairs defined in a module's host HTML page" - 
there is a chance that a gwt dictionary is limited to reading key/value string pairs that reside 
within the *gwt module host HTML page* (i.e., within the context of the GWT application - 
"http://[server]/webadmin/webadmin/...") and not outside - need to find that out.

- again, from [1]:
"a variety of error conditions (particularly those involving key mismatches) cannot be caught until 
runtime. Similarly, the GWT compiler is unable discard unused dictionary values since the structure 
cannot be statically analyzed".
(this is expected, as the suggested loading here is dynamic, rather than static)

- not sure exactly how this would work with localization; there is "A Caveat Regarding Locale" 
mentioned in [1] - IIUC, we will lose the automatic locale-mapping that we have today, and we would 
need to do it ourselves somehow (not a big deal, I suppose, just some extra work that needs to be 
done here).

----
Thanks,
Einav

[1] http://www.gwtproject.org/javadoc/latest/com/google/gwt/i18n/client/Dictionary.html

----- Original Message -----
> From: "Roy Golan" <rgolan at redhat.com>
> To: "engine-devel" <engine-devel at ovirt.org>
> Sent: Wednesday, August 7, 2013 2:59:07 AM
> Subject: [Engine-devel] Dynamic resource loading in GWT
> 
> Painful issue here - we all know the regular drill of maintaining
> messages in many places, I18N files and so on.
> Also there's a patch to make all available timezone an java enum and by
> that share it for free with the UI. its a way better than a backend Query.
> 
> But this is all hard-coded, not flexible, hard to maintain, we all know.
> 
> Why won't we make GWT load a javascript dictionary/dictionaries from a
> servlet or our host page html[1] using GWT Dictionary[3]?
> 
> that way the configuration is shared with the engine, it relies on the
> disk, customers and GSS can change it on-site and so on.
> 
> 
> | index.html | -> | file servlet | -> |read /etc/ovirt-engine/conf/...|
> 
>      ^
>       |
> 
> | GWT loads Dictionary |
> 
> 
> candidates for dynamic resources
> * I18N resources AppErrors...
> * config ( just the UI subset )
> * osinfo ?
> 
> 
> 
> [1] host page html -
> http://www.gwtproject.org/doc/latest/DevGuideOrganizingProjects.html#DevGuideHostPage
> [2] Dynamic string internationalisation -
> http://www.gwtproject.org/doc/latest/DevGuideI18n.html#DevGuideDynamicStringInternationalization
> [3]
> http://www.gwtproject.org/javadoc/latest/com/google/gwt/i18n/client/Dictionary.html
> 
> Thanks,
> Roy
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