Hi All!
I'm trying to make the Comanche SCA example to work with iPOJO. This example
application is a very simple web server and is used everywhere with SCA. The
problem is that different components of this application implements the same
java interface.
In the SCA + Fractal component model world (Frascatti), this is not a
problem, since the software can be assembled by direct referencing the
desired instance. But this is a problem with OSGi/iPOJO, since, as far as I
know, the bind is done automatically and the key for this mechanism is the
unicity of the interface implemented by the component, which identifies the
component.
When not using composites, I found a workaround for this problem by
specifying a name for a instance and using this name in the component
declaration, in the '<requires from="RequestDispatcher"...' key.
However, I'm facing a problem trying to use composite to assemble the
Comanche application. I'm trying to build a composite who encapsulates 3
components that implement the same interface. This composite has to export
one specific instance to be used by the parent scope. To accomplish this, I
did the following XML:
<composite name="RH">
<instance component="FileRH" name="FileRH-Instance"/>
<instance component="ErrorRH" name="ErrorRH-Instance"/>
<instance
component="org.apache.comanche.requestDispatcher.RequestDispatcher"
name="RequestDispatcher"/>
<provides action="export"
specification="org.apache.comanche.services.RequestHandler"/>
</composite>
The problem is: since all three components implements the same
RequestHandler interface, how can I tell the composite to export the
specific RequestDispatcher instance? I tried to use the "name" workaround,
explained above, but it did not work. How can I do it?
Also, I miss a Reference Card like the one found in
(http://felix.apache.org/site/ipojo-reference-card.html) enlightening the
possibilities with composites. Do anyone plan to create something like that?
Thanks in advance!
Fabio
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