Module exports for java.base: NIO stuff
Alan Bateman
Alan.Bateman at oracle.com
Sun Dec 11 11:18:26 UTC 2016
On 10/12/2016 15:21, David M. Lloyd wrote:
> Would it be possible to have all available selector provider
> implementation classes listed in a "provides java.nio.channels.spi
> with ..." section of java.base's module descriptor? My use case is as
> follows:
>
> Our I/O library (XNIO) relies on the ability to detect and use
> different available selector providers for different purposes in
> different circumstances (often to provide alternatives in the event of
> platform-specific behavior problems, or to prefer lighter providers
> over heavier ones in certain situations). Right now we directly use
> reflection to seek out specific named classes. However, it would be
> much better if we could instead use a service loader to discover all
> available implementations, which would free us from having to use
> reflection for this purpose and also avoid lots of pointless probing.
>
> Today you need to have --add-exports=java.base/sun.nio.ch=xxx which is
> definitely not ideal.
>
> Maybe there's another solution to this problem as well; suggestions
> welcome.
>
I don't think we've ever come across alternative implementations of
SelectorProvider, are these complete implementations? Are you attempting
to wrap the default implementation - I ask because there isn't anything
in the service type (SelectorProvider in this example) that is useful
for doing selection.
-Alan.
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