Hmm... I can't find any code that's using it. All my incantations
ended up causing recursion with the Alias service.
Here is something that works by being lazy:
@Contribute(SymbolSource.class)
public void
addTestResourceSymbols(OrderedConfiguration<SymbolProvider>
configuration,
@InjectService("ApplicationGlobals")
final ApplicationGlobals
applicationGlobals
) {
configuration.add("testResources", new SymbolProvider() {
private volatile ContextResourceSymbolProvider provider = null;
public String valueForSymbol(String symbolName) {
if (provider == null) {
synchronized (this) {
if (provider == null)
provider = new
ContextResourceSymbolProvider(applicationGlobals.getContext(),
"test.properties");
}
}
return provider.valueForSymbol(symbolName);
}
});
}
On Thu, Jul 21, 2011 at 8:27 AM, Erik Fäßler <erik.faess...@uni-jena.de> wrote:
> Hey all,
>
> I've been struggling for a while with what seems to be a simple task at
> first:
>
> "On WebApp startup, load a configuration file - located in the app's
> context, i.e. in the WEB-INF directory - and contribute its contents to
> Tapestry's SymbolSource service."
>
> I always get in trouble by the (servlet)context being null when
> contributing. I get the ApplicationGlobals service and get the context from
> it.
> I have a solution were the context is _sometimes_ null and sometimes not -
> so I just have to restart the servlet container as often enough as it will
> eventually work. Of course, this is nothing to keep it this way. In fact,
> it's quite annoying ;-)
> In the end I thought that it would just not be possible to access the
> ServletContext for contributing a SymbolSource depending on it. But then I
> came about the "ContextResourceSymbolProvider" class. I would have thought
> you would use it that way:
>
> public static void contributeSymbolSource(final
> OrderedConfiguration<SymbolProvider> configuration,
> @InjectService("ApplicationGlobals")ApplicationGlobals applicationGlobals) {
> configuration.add("SemedicoToolsSymbols", new
> ContextResourceSymbolProvider(applicationGlobals.getContext(),
> "configuration.properties"), "before:ApplicationDefaults");
> }
>
> but this does not work as described above: At this point of application
> startup, the context (gotten by applicationGlobals.getContext() as shown
> above) is null.
>
> So I have two questions:
> 1) How to use ContextResourceSymbolProvider? I currently can't imagine a
> useful employment of this class without being able to contribute it to
> Tapestry's SymbolSource.
> 2) Is it at all possible to read a file from the context and contribute it
> to the SymbolSource service? Goal: Being able to configure my WebApp from
> file rather than being forced to edit the code every time I change
> deployment (from test to productive for instance; I would have to change my
> local paths to the correct paths in the productive environment; other
> developers have their own local resources, etc).
>
> Thanks for your time!
>
> Best,
>
> Erik
>
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