On Aug 26, 2009, at 23:07 , Joel Schuster wrote:
Maybe... Actually, that's why I ask the question. What's the
difference then b/t properties of configuration objects and
properties with which services are registered that sounds very
similar to me.
Or, more to the point, in what cases would I use one over the other?
ConfigAdmin is used to centrally/exernally provide configuration for
your components.
Registering properties on services is done so you can query the
service registry based on them.
Sometimes the two are used together to first externally configure a
component and then pass on this configuration to interested parties as
part of the service properties.
An example. Let's assume you have a component that is a servlet, and
you want to be able to configure the endpoint for that servlet
externally. You'd use ConfigAdmin to do that. Let's also assume that
the OSGi HttpService supports the whiteboard pattern (by default it
doesn't but that doesn't matter). By registering your servlet service
with an endpoint property, HttpService could pick that up and register
the servlet at the correct endpoint.
Greetings, Marcel
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