Hello Bokie,
On Nov 10, 2012, at 14:18 PM, bokie <[email protected]> wrote:
> There must be something about the ResourceDependency which I don't
> understand because nothing happens in the class that depends on a specific
> resource.
>
> I have embedded a text file with my bundle (/res/file.txt).
> In my bundle Activator, which extends DependencyActivatorBase I have added
> the dependency with the DependencyManager in the init method:
>
> public void init(final BundleContext context, final DependencyManager
> dependencyManager) throws Exception {
> dependencyManager.add(
> createComponent()
> .setImplementation(ResDependent.instance())
> .add(createResourceDependency()
> .setResource(context.getBundle().getEntry("/res/file.txt"))
> .setRequired(true)
> )
> );
> }
>
> If I set required = true, ResDependent.start does not get called.
> If I set required = false, ResDependent.start gets called but nothing else
> happens.
>
> What am I missing here?
A resource in the context of the dependency manager is an abstract thing that
is identified by a URL. So a resource can be anything that can be represented
by a URL. That means resources can come from (a folder in) a bundle, the
filesystem, some remote location or anywhere else you can point a URL.
What you are missing is that the dependency manager currently does not come
with any implementation of a resource provider. Therefore, whenever you define
a resource dependency (like in your example) you will find it's not there.
What you need to provide yourself, is a resource provider that "serves" all
resources in your bundle. Now you're not completely on your own here, as there
are tests that you can use as examples. Take a look at:
in: test/src/main/java
org.apache.felix.dm.impl.ResourceAdapterTest
It contains a nested static class called ResourceProvider. It is not exactly
what you want, because this implementation serves resources from a static list
(with one item for this test) but it should be enough to get you going.
Hope this helps.
Greetings, Marcel
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