RFR JDK-8185582, Update Zip implementation to use Cleaner, not finalizers

[mandy chung]

On 10/30/17 1:49 PM, Peter Levart wrote:
>
> ...above example lends itself as a use case for the following 
> equivalent alternative using internal low-level API where ZStreamRef 
> becomes the Cleanable itself:
>
> class ZStreamRef extends PhantomCleanable<Object> {
>
>     private final LongConsumer end;
>     private volatile long address;
>
>     ZStreamRef (Object referent, LongSupplier init, LongConsumer end) {
>         // here the registration MUST happen as 1st thing - enforced 
> by javac
>         super(referent, CleanerFactory.cleaner());
>         this.end = end;
>         this.address = init.getAsLong();
>     }
>
>     long address() {
>         return address;
>     }
>
>     @Override
>     protected void performCleanup() {
>         long addr = address;
>         address = 0;
>         if (addr != 0) {
>             end.accept(addr);
>         }
>     }
> }
>

I was thinking something along this line what could ensure the 
"cleanable" object is allocated before allocating the resources that the 
cleanable is responsible for clean up.   I think it'd be a good RFE to 
improve the Cleaner API to address the OOM case.

Mandy