On Mon, 21 Nov 2022 20:06:20 GMT, Alan Bateman <al...@openjdk.org> wrote:
>>> > Although this looks much simpler and concise, it means "a new object is >>> > created for each invocation" >>> >>> My comment was actually to see if DirectBuffer could extend AutoCloseable >>> so that the acquire returns "this" for the non-session case. Doing the >>> equivalent for the session case might leak into MemorySessionImpl >>> implementing DirectBuffer which you probably don't want to do. If >>> NOP_CLOSE.close can do the Reference.reachabilityFence(this) then it would >>> at least improve some of the use-sites. >> >> Not sure that is simpler. ByteBuffer <: AutoCloseable doesn't seem to make >> sense to me. I'm also not sure how much object allocation (all this stuff >> will become value types) should be the driving factor in these code paths. > > Right, I didn't mean BB <: AC but to see if we avoid needing to wrap it > because this PR is touching several low level and performance critical code > paths. For the faraway places then having the close do a > Reference.reachabilityFence(this) should avoid the surprise that the buffer > has to kept alive even though it appears that the try-with-resources is doing > it already. I have reworked Acquisition. I think we could merge the old and new way in a separate PR. ------------- PR: https://git.openjdk.org/jdk/pull/11260
