On 04/01/2014 05:43 PM, Peter Levart wrote:
On 04/01/2014 03:49 PM, roger riggs wrote:
Hi Peter,
The design using enum for the os dependencies does not make it possible
to include only the support needed for a particular platform at build
time.
Every implementation will be carrying around the support for all the
other platforms.
A build time binding would be more efficient.
Roger
That's true. A trade-off between maintainability and efficiency. The
efficiency has two categories here. One is the size of the
distributable and the other is run-time efficiency. I've been thinking
to improve both efficiencies (the run-time in particular) with a
little re-design. Since nearly each OS platform requires a sub-class
of UNIXProcess to implement the differences, I can move the
implementations of various methods now in Os enum to the UNIXProcess
subclasses and get rid of Os enum per-instance subclasses.
Let me try this and see what comes out.
Hi Roger,
Well, it turns out the methods would like to stay in Os (renamed to
Platform), but there is no need for per-enum-instance subclasses. Using
enum constructor parameters and switch statements makes code even more
compact and easy to follow...
http://cr.openjdk.java.net/~plevart/jdk9-dev/UNIXProcess/webrev.04/
I belive there is still room for consolidating logic in various
Input/OutputStream wrappers used in UNIXProcess variants. But in the
first round I tried to preserve the exact behaviour. If the wrapping of
streams could be made more-or-less equal in all UNIX platforms, then the
need for UNIXProcess subclasses and/or overhead of support classes
included but not used goes away...
Regards, Peter
On 4/1/2014 9:16 AM, Peter Levart wrote:
Hi Alan, Volker,
Thanks for sharing the info and for testing on AIX. Here's the
updated webrev that hopefully includes the correct "dispatch on
os.name" logic. I included "Solaris" as an alternative to "SunOS"
since I saw this in some documents on Internet. If this is
superfluous, I can remove it:
http://cr.openjdk.java.net/~plevart/jdk9-dev/UNIXProcess/webrev.03/
I tested this on Linux and Solaris and the java/lang/ProcessBuilder
jtreg tests pass. So with Volker's test on AIX, the only OS platform
left for testing is Mac OS X. Would someone volunteer?
Regards, Peter
On 03/27/2014 11:18 AM, Volker Simonis wrote:
Hi Peter,
thanks for applying these changes to the AIX files as well.
With the additional line:
if (osName.equals("AIX")) { return AIX; }
in Os.get() your change compiles cleanly on AIX and runs the
java/lang/ProcessBuilder tests without any errors.
So from an AIX perspective, thumbs up.
Regards,
Volker
On Wed, Mar 26, 2014 at 5:18 PM, Alan Bateman
<alan.bate...@oracle.com> wrote:
On 26/03/2014 15:19, Peter Levart wrote:
I couldn't find any official document about possible os.name
values for
different supported OSes. Does anyone have a pointer?
I don't know if there is a definite list but I assume we don't
need to be
concerned with anything beyond the 4 that we have in OpenJDK,
which is
"Linux", "SunOS", "AIX" and contains("OS X").
If we get to the point in JDK 9 where src/solaris is renamed to
src/unix (or
something equivalent) then it could mean that the Os enum can be
replaced
with an OS specific class in src/linux, src/solaris, ... and this
would
avoid the need for an os.name check at runtime.
-Alan.
