Re: Configuration initialization per web request issue

You get me rethinking again.

So if i understand correctly, i can still use a properties file to hold
multiple templates for a single locale.
My current idea is that multiple locales means multiple properties file.
And this means that my custom template loader will have to do these :
- be able to load the correct properties file based on the locale
- get the correct template based on the passed template name
- somehow be able to tell what template has changed within a single
property file.

For the template name, i can just use the property key as the name, and
return the name again as the template source, and return the property value
as the template string (as a reader instance)
For the modification date, i can just add another
<template-name>.last-modified property key.
So both are fine.

But i am still confused on how to get the correct localized properties file
from template loader.
The locale will be varied depending on my webapp's user location, so i
imagine i can call :
cfg.getTemplate(templateName, userLocale);
I am still wondering on how to access this locale reference in the custom
template loader in order to get the correct properties file.

On Sun, Feb 10, 2013 at 6:14 PM, Daniel Dekany <[email protected]> wrote:

> Sunday, February 10, 2013, 12:07:35 PM, Albert Kam wrote:
>
> > Your reply is very helpful. I think i understand the important
> > points about caching and whether it's cachable or not. This clears
> > up about the expensiveness without caching, having to reparse everything
> per request.
> >
> > I just realized we can get the localized template by passing the
> > locale in the config.getTemplate(),
> > so with this, i dont need to use properties anymore.
> >
> > I will just use cfg.setDirectoryForTemplateLoading() and use
> > multiple ftl files instead of merging all into one properties file,
> > therefore having the caching feature and no need for custom
> > template loader anymore (which in my previous idea wont work well,
> > because all caches will be purged if the properties file was
> > changed, even if for just one property)
> >
> > The convinience that i will lose is everything is not inside 1 file
> > anymore like the properties file, but i think i can cope with it with
> some tools.
>
> I suppose this is clear, but with a custom TemplateLoader you can
> still put all the templates into the same file.
>
> --
> Best regards,
>  Daniel Dekany
>
>
> > Thank you !
> >
> > Regards from Jakarta,
> > Albert
> >
> >
> > On Sun, Feb 10, 2013 at 5:18 PM, Daniel Dekany <[email protected]>
> wrote:
> > Sunday, February 10, 2013, 5:58:54 AM, Albert Kam wrote:
> >
> >> I want to use freemarker's multiple StringTemplateLoader-s per each
> >> request. This means that i will have to new Configuration() per each
> >> request, right ? I wonder if this is the right way to do it, since
> >> i've read somewhere that Configuration should be initialized once
> >> per webapp because it's expensive ?
> >
> > The the biggest expense of not using a long-lived/shared Configuration
> > instance (and perhaps the only significant expense) is that you trash
> > the previously built template-cache each time you create a new
> > configuration. The template-cache stores the templates pre-parsed, so
> > when you request a template with Configuration.getTemplate(someName,
> > someLocale) for the 2nd time, FreeMarker will not load and parse it
> > again.
> >
> >> Why do i need this approach is because i want to get locale
> >> specific templates per request, which i put inside a properties
> >> file, and then fill up the templates.
> >>
> >> Example of the entry in the properties file :
> >> my.template.key1=my.freemarker.template1.here
> >> my.template.key2=my.freemarker.template2.here
> >>
> >> So the logic what i have in mind is :
> >> - i have the keys in the UI (dynamiclly obtained)
> >> - i load templates with resourcebundle depending of current user's
> locale
> >> - initialize configuration object
> >> - setup multiple string template loaders with those i load from
> >> resourcebundle and set them to configuration object via
> MultiTemplateLoader
> >> - setup the models n get the template outputs
> >> - print them onto UI response
> >>
> >> All of these can happen per web request.
> >>
> >> Is this approach appropriate ? Thank you !
> >
> > The template cache uses name+locale as the key to look up entries, so
> > just because you have different locales per request, you don't have to
> > give up caching. The problematic case is when the templates have no
> > "name" with which you can identify them, or they have but you don't
> > have a last modification time for them yet they are changing. In that
> > case you can't use the cache for *those* templates. But you can still
> > use the a common configuration, you just use `new Template(...)` to
> > create ad-hoc Template instances, instead `config.getTemplate(...)`.
> > The caveat with `new Template(...)` is that templates that are not
> > available with `config.getTemplate(...)` can't be
> > #include-ed/#import-ed in other templates.
> >
> > Of course, to use the template-cache, you need a TemplateLoader that
> > stays during the whole life-cycle of the Configuration. A
> > StringTemplateLoader that's recreated for each request won't do. So if
> > you have some custom template storage, instead of filling a
> > StringTemplateLoader each time, maybe you can implement the
> > TemplateLoader interface and then do `config.setTemplateLoader(new
> > MyResourceBundleTemplateLoader(...))` once.
> >
> > --
> > Best regards,
> >  Daniel Dekany
>
>
>
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