Why not just use the whiteboard pattern? You said: "whiteboard ... does not
make sure that all of the servlets are available at the time the server is
started." Why is that important?
Regards
Neil
--
Neil Bartlett
Sent from a phone
On Wednesday, 26 February 2014 at 09:47, Balázs Zsoldos wrote:
> 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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