services, take 1

[Julien Ponge]

> I think it would be really good to add a mechanism to ServiceLoader
> that could inform a consumer that a service is now removed. This would
> mean that in more dynamic environments, such as OSGi, where modules
> can be removed during the lifetime of the VM, it would be possible to
> create clients such that they won't hold on to handed out services
> forever...
> 
> 

+1