David,
Have you checked whether the OSGi Service Layer can meet your high-
level requirements?
True, it does not fit exactly with the kind of framework you're
describing, but it does aim to solve the same broad category of
problems. Why invent a new framework?
Regards,
Neil
On 26 Dec 2007, at 12:06, David Leangen wrote:
tricks aren't always good ;) if you take a
step back and explain 'why' you want to
import a single, not-known-before-hand,
unversioned class into your application
then it would help others suggest solutions
He he... yeah, tricks...
Well, essentially I have a framework that accepts classes abstracted
to a
certain type. For simplicity, let's just use a concrete example:
Vehicle.
I don't want the framework to know anything about the domain
specifications
of Vehicles (like Automobile, Bicycle, Skateboard [hey, why not?],
etc.).
The framework just does some really generic stuff on the Vehicles,
like
managing lifecycles and such.
However, to actually be useful to consumers (ex: UI dev and such), I
need to
cast each Vehicle to its particular domain.
Currently, I see two ways of doing this, each one requiring the
client to do
the casting:
First old-school way:
Vehicle vehicle = service.getVehicle( "1234" );
Automobile auto = (Automobile)vehicle;
Second way using generics:
Automobile auto = <Automobile>service.getVehicle( "1234" );
Third way using dynamic proxies:
VehicleInvocationHandler = service.getHandler( "1234" );
Automobile auto = (Automobile)Proxy.newProxyInstance( ... );
I don't like the first way or the third way, since I want to hide
this kind
of cruft from the client.
I don't like the second way because in my implementation, generics are
already getting out of hand with calls like (no exaggeration):
Vehicle<T extends B<V>, V extends X, W, Y extends Date>
I really like generics, but this is getting bloody ugly, not to
mention
brain racking...
So, my idea was to work with the third way (dynamic proxies), since
this is
the cleanest, but move the creation of the proxy to the host framework
bundle. Only problem is that I get my CNFE.
So, I need to be able to load the interface into my bundle so I can
cast the
dynamic proxy.
Cheers,
David
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