On 15 November 2010 14:18, Kit Plummer <
[hidden email]> wrote:
>
> I'm just thinking out loud here...I need to be able to rapidly build and deploy simple RESTful interfaces to models stored in Derby (within a Karaf-based setup). I'm wondering what the potential for using Scalatra is to do this, considering database access and general Scala support within OSGi.
That should be fine really. Ross is a fine chap & hangs out on the
Scalate IRC room :). It might be that Scalatra might need a little
tweak or two to make it proper OSGi bundles - not sure if its OSGi
ready yet.
As an aside I'm personally a big fan of JAXRS/Jersey for writing
RESTful resources; I particularly like being able to use dependency
injection into the resource bean so its easy to share state and code
across different kinds of resources & methods - plus being able to
create very modular web applications as the template-URI space for a
web application is figured out by combining all the resource beans on
the classpath; rather than a single chunk of DSL. Though Scalatra is
very cool too & can be a little simpler to get started I think due to
its DSL nature.
I guess an ideal for JAXRS 2.0 for me would be something in between
Scalatra and Jersey; so its nice and DRY and you can choose to either
write DSL methods inline like in Scalatra or write injected resource
beans like JAXRS (though maybe a little more DRY).
> I believe SMX4 supports Scala bundles...but not positive.I'd considered using Groovy, but don't know of a Sinatra-like DSL there - and am currently working with Restlets.Any thoughts? TIA.Kit
Any Scala code just compiles down to regular bytecode, so it should
work fine inside OSGi providing you use the OSGi-ified scala-library
bundle.
Where there is more of a challenge is when you dynamically compile
Scala code on the fly though (e.g. using Scalate as a template engine
then changing the templates on the fly rather than precompiling them
as part of your build process). Though I think Gert's got Scalate
working nicely in OSGi these days. I'm totally biased, but I really
like Scalate as an alternative to
JSP/Velocity/FreeMarker/StringTemplate for creating views when you are
not just using JAXB/Jackson to render XML/JSON from DTOs. In
particular Jade is awesome for markup & HTML and SSP for arbitrary
text.
BTW the various Scala DSLs for database access are looking great. e.g.
http://squeryl.org/selects.htmlScalaModules also looks cool for working with OSGi...
https://github.com/weiglewilczek/scalamodules--
James
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