osgi-dev-boun...@mail.osgi.org wrote on 2015/03/18 09:04:08:
> From: Frank Langel <fr...@frankjlangel.com>
> Hi,
>
> I did some research, but didn¹t find a way to register a generic
service.
> I would like to do sth like this
>
> context.registerService(Map<K,V>.class, service, properties), I.e.
> context.registerService(Map<Integer,String>.class, new
> HashMap<Integer,String>(), null)
'Map<Integer,String>.class' does not exist at runtime. Only 'Map.class'
exists at runtime due to generics erasure. So there is no way to look up a
class using generics since they are erased at runtime.
>
> The injection should then only work if the registered and the injected K
> and V are the same. Assuming I only have one service of type Map
> registered,
>
> @Reference
> public void setMapService(Map<Integer,String> mymap) {
> This.map = my map;
> }
>
> Would succeed.
>
> The following would fail as V (registered) != V(referenced service)
>
> @Reference
> public void setMapService(Map<Integer,Integer> mymap) {
> this.map = mymap;
> }
>
> As a workaround, I could define K and V as service properties and filter
> for them, but that¹s not very elegant and very error prone
>
> Any feedback would be appreciated
> Frank
--
BJ Hargrave
Senior Technical Staff Member, IBM
OSGi Fellow and CTO of the OSGi Alliance
hargr...@us.ibm.com
office: +1 386 848 1781
mobile: +1 386 848 3788
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