An update on this. We have not found any widespread use of this API
The expectation (nascent plan) is that this package will not be carried
forward into the modular JDK. I suppose it is possible some new JEP may
revive it as a standard API for in JDK 10 but there is no plan for that.
-phil.
On 05/19/2015 09:28 PM, Andrew Thompson wrote:
A few years ago I had a brief email exchange with Doug Lea I the idea of providing an SPI
so platforms could plug in implementations for a "default" ExecutorService. The
idea was this could be a regular fixed thread pool or something more exotic like
libdispatch, which is, after all OS managed and supposedly plays nicely with power
management etc.
I didn't take the idea any further, but something similar cropped up when
lamdas were added in Java 8, the idea of a default mechanism for parallel
lambda execution.
I still think there's a good idea in there. The notion of a default thread pool
that could be backed by more native code on various platforms. But that whole
infrastructure would need to be created. It's more like a JEP. If that were to
exist then the Dispatch class would be a natural way to implement on OS X.
Andrew
On May 19, 2015, at 8:01 PM, Phil Race <philip.r...@oracle.com> wrote:
Apple's JDK 6 provided the non-standard "com.apple.concurrent.Dispatch" class
which was a means for Java code to access Apple's "libdispatch".
To quote the documentation at
http://www.coderanch.com/how-to/javadoc/appledoc/api/com/apple/concurrent/Dispatch.html
" Factory for |Executor|s and |ExecutorService|s backed by libdispatch.
Access is controlled through the Dispatch.getInstance() method,
because performed tasks occur on threads owned by libdispatch"
The class carried over into Oracle JDK for OS X and is there all the way up
to current JDk 9 dev builds.
The question is what to do with this class in the 'modular JDK' where
we need to decide on the 'supportedness' of many APIs and what
to do with them as a result.
There is one Eclipse bug from 2010 where one of the methods was
added to support embedding SWT in AWT applets in the browser :
https://bugs.eclipse.org/bugs/show_bug.cgi?id=303869
but that was for JDK 6 and SWT can't be embedded in the current JDK 7/8/9
Java Plugin for OS X which runs out of process .. so that usage is moot.
So the current thinking is that since we do not know of anyone who
uses this class that it should be unsupported in JDK 9 and not
visible in the modular JDK image.
So .. any comments ?
-phil.
