On 22/02/2017 14:06, Vitaly Davidovich wrote:
:
Yes, I know it's never been supported. That's been fine and it has
worked well ... until jigsaw came into the picture. So my real
question is really whether there can be a proper/supported API, with
good performance characteristics, that would give access to the base
address of a direct bytebuffer. In other words, can we make the
notion of a direct bytebuffer first class? That notion would carry the
base address with it (amongst whatever else is deemed worthwhile).
NewDirectByteBuffer is used on the JNI side already, but I need
something at the Java level to get the base address so that field
offsets can be calculated for reading data using Unsafe (yes, another
performance hack because officially supported Java variants currently
don't JIT well enough). The use case is a "view" of native memory,
attached to a DBB, used for IPC.
If you are using NewDirectByteBuffer already then couldn't you use a map
of ByteBuffer -> address?
-Alan
