8236925: (dc) Upgrade DatagramChannel socket adaptor to extend MulticastSocket

[Alan Bateman]

On 14/01/2020 17:49, Daniel Fuchs wrote:
> Hi Alan,
>
> Globally this looks good to me. One small nit is that the `oldImpl`
> field could now also become final (by applying the same trick you
> did with createImpl - that is - have oldImpl() return a boolean
> rather than set the field and assign the result in the constructor.
Thanks for going through this. I tried to keep the changes to 
DatagramSocket to a minimum but I don't mind making an exception for 
oldImpl. It's a slippery slope as there is a lot of technical debt in 
this area. Also oldImpl is the the support for DatagramSocketImpl that 
were compiled for JDK 1.3 or older and I really hope we can drop that 
code soon.

Here's the updated webrev that changes oldImpl to be final.
    http://cr.openjdk.java.net/~alanb/8236925/2/webrev/

-Alan