On 31/03/2025 16:51, Engebretson, John wrote:
Alan – is this what you have in mind:
ByteArrayOutputStream.getInstance() // returns existing class
ByteArrayOutputStream.getUnsynchronizedInstance() // returns subclass
of BAOS that overrides the synchronization
ByteArrayOutputStream.get<Scalable|Memory|Fast|Segmented>Instance() //
returns the new class
BAOS has been synchronized since JDK 1.0. While undocumented, it's
possible that existing code depends on this 30 year behavior so I think
we are stuck with it.
The removal of biased locking has spurred on a few complaints that the
class is needlessly synchronized. A static factory to return an
unsynchronized BOAS would help but only if it isn't used with code that
assumes all operations are synchronized. So I think we will have to look
at the API docs for this.
It's not clear that we need to have several implementation with
different performance tradeoffs. So I think part of the exploration will
be to see what usages perform better or worse, and whether having a
parameter to specify the initial size or some hint of the max size would
help the discussion.
-Alan
