Hi,
an issue came up a couple of times that I could not solve with Declarative
Services. First, I thought I had a very special use-case but it came up
more and more times so I think it is time to share my thoughts.
Imagine you have a servlet container as a component. The component will be
instantiated if there is configuration and it will listen on the configured
port. You want to specify the servlets that are available on that server
instance. If you use whiteboard pattern, that does not make sure that all
of the servlets are available at the time the server is started.
What I was imagine is to create in the ServerComponent an array references:
@Property(name="servlet.target", cardinality = 1)
@Reference(cardinality = ReferenceCardinality.MANDATORY_BY_CONFIGURATION)
Servlet[] servlet
Now if the property servlet.target has the following value
servlet.target = {"(servletName=myServlet1)", "(servletName=myServlet2)"}
than the component will be active when the two servlet OSGi services are
available that match the OSGi filters defined in the property.
The logic comes up very often. Every time, when we want to allow extension
points in our components in the way that our component should start only
when all the configured extension points are available, this feature would
be really helpful.
What do you think?
Regards,
Balazs Zsoldos
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