[10] RFR: 8193507: [REDO] Startup regression due to JDK-8185582

[Claes Redestad]

On 2017-12-14 13:29, Alan Bateman wrote:
> On 14/12/2017 12:25, Claes Redestad wrote:
>>
>> We need the cleanable = null case for the FinalizableZStreamRef case, 
>> otherwise we'd go into spin. The cleanable is implicitly checked for 
>> null in the ZStreamRef.get method, which is the only one
>> used outside of these classes.
> Okay but can the clean method at least check if cleanable is null to 
> avoid needing to wonder if it's possible. 

It isn't possible: cleanable can be null only when we're a 
FinalizableZStreamRef, which overrides clean and ignores cleanable. This 
awkwardness stems from the fact that we *don't* want ZStreamRef to have 
a finalizer,
so we need to inherit in the "unnatural" direction. We could possibly 
model this more cleanly with an interface and two disjoint 
implementations, but I don't want to attempt such a refactoring now.

> Also can the constructors be grouped as it's very confusing to not 
> have them grouped together (dropping the space in "ZStreamRef (" would 
> help too. Otherwise I think the approach is okay.

I've dropped the ZStreamRef(long) constructors and fixed a few 
whitespace issues in the latest webrev.

/Claes