I think we have think a bit deeper. Assume you have 2 exporters of IFoo that
are both compatible with the proxy you generate. Shouldn't you create a proxy
for both?
I think the only viable solution is to register the proxy with each distinct
exporter of IFoo's package for which you're compatible with to ensure you do
not leave anybody out in the cold.
Logically, 4.3's new registerService(Class<S>,S,Map) method should provide you
with the capability but I am afraid the current definition of the compatibility
is in limbo because it is unfortunately defined in terms of isAssignableTo,
which unfortunately is string based instead of class based. I think we need to
define a Class<?> version of this method that we then use for compatibility
when possible. This will allow you to register objects from the DP that are
compatible with other bundles even though you do not import the service
interfaces. I file an errata so this is looked into.
Oh, how I long for the days of OSGi R3 when we did not have multiple versions
:-(
Kind regards,
Peter Kriens
On 21 feb 2011, at 07:00, Scott Lewis wrote:
> On 2/20/2011 6:14 PM, BJ Hargrave wrote:
>> <stuff deleted>
>>
>> You could use dynamic import package but that has some drawbacks. First you
>> would need to actually load the type(s) to force the framework to establish
>> the wires before you register the service. Second, you could only support
>> one version of the package could be a big limitation.
>
> Yes, I see how supporting only one version of a package could be a big
> limitation.
>
>>
>> This is why I previously suggested dynamically creating, installing and
>> starting a bundle which has the proper import package statement. This bundle
>> does not need any classes in it. You just need an "anchor" to use for its
>> class loader to access the types and for its context to register the
>> service. The actual work can be done by your bundle. Make sure to properly
>> uninstall this bundle when no longer necessary. There can be many of these
>> bundles for different service types.
>
> Forgive me, but this approach seems kind of clumsy and complex to manage to
> me...as it could be necessary to create, install, start and manage/uninstall
> a lot of these dynamic bundles...i.e. one for each distinct imported remote
> service.
>
> Are there any viable approaches other than this? e.g. can the wiring of the
> RSA (or TopologyManager) bundle be dynamically manipulated...to allow the RSA
> or TM itself to register the proxy service factory?
>
> Thanks,
>
> Scott
>
>
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