notes from the Java binding meeting at OGF22
Andre's notes pretty much speak for themselves ;-) Thilo ----- Forwarded message from Andre Merzky <andre@merzky.net> -----
From: Andre Merzky <andre@merzky.net> To: Thilo Kielmann <kielmann@cs.vu.nl> Subject: notes
:-)
OGF.22 SAGA-SESSION I: Java Language Bindings
When: 9:30 - 11:00 What:
- IPR - sessions during this OGF - agenda accepted
- SAGA spec landscape
- design choices
Q: Malcolm: on what level should concurrency be? Every call? A: yes. But not enforcing execution order
Q: why IOException, not SAGA_IO_Exception? A: lets check... - yep, should do
Q: where are infos encoded in ERRNO? A: inside the exception. Extra field?
Q: no permissions? really? A: yes, really. ;-)
Note: Java-7 will have permissions.
- interfaces & factories
Q: Malcolm: with boostrap loader, you can't mix two implementations in one VM A: right. We discussed this, but cuold not find a sensible use case... A: Daniel: Actually, does not prevent that, as you can use multiple class loaders
Q: Hidemoto: Which ways to set that property? A: usual Java ways...
Q: Why not have session.createFile (URL) 'Solves' the default session problem (missing) looks simple gives same signature for both versions A: Hmm, why not...
- SAGAObject
Q: do you need getType A: could use isInstanceOf
- saga.error
Q: SagaError? What is the supposed action? Q: Daniel: do NOT call it an Error A: Hmmm... Yep, could use NoSuccess If not, discuss again on mailing list.
Q: Hidemoto: add 'Exception' to names. Q: Exception -> SAGAException Q: move exceptions to org.ogf.saga? A: possibly yes to all of them
- tasks:
Q: task container: possibly get_task_type (cookie)? A: not possible
- job
Q: Daniel: Task<Object> -> Task<?extendsObject> A: aha
- buffer
Q: can you have impl managed buffers? A: yes
Q: Thilo: should we use java.nio.ByteBuffer A: Hmm, dunno.
Q: buffer should have long for size? A: yes
- summary
Q: open points? A: address all 'binding issue' tags in the core spec
Q: intro sections? A: remove intros if semantics is the same A: Daniel: keep it so user does not need to jump so often
-> tough call, probably should keep it.
Q: Shantenu: how many people intent to use that spec? A: not many....
-- "We've got too much time to waste to stand around here doing things." - Tigger
----- End forwarded message ----- -- Thilo Kielmann http://www.cs.vu.nl/~kielmann/
Thilo Kielmann wrote:
Andre's notes pretty much speak for themselves ;-)
Thilo ----- Forwarded message from Andre Merzky <andre@merzky.net> -----
From: Andre Merzky <andre@merzky.net> To: Thilo Kielmann <kielmann@cs.vu.nl> Subject: notes
- job
Q: Daniel: Task<Object> -> Task<?extendsObject> A: aha
Well, I wanted that, but unfortunately: [javac] /home/ceriel/workspace/Saga/src/org/ogf/saga/job/Job.java:21: unexpected type [javac] found : ? extends java.lang.Object [javac] required: class or interface without bounds [javac] public interface Job extends Task<? extends Object>, Async, AsyncAttributes, Permissions { [javac] ^ [javac] 1 error Ceriel
Ceriel, What means 'without bounds'? Thanks, Andre. Quoting [Ceriel Jacobs] (Feb 27 2008):
From: Ceriel Jacobs <ceriel@cs.vu.nl> To: Thilo Kielmann <kielmann@cs.vu.nl> Cc: saga-rg@ogf.org Subject: Re: [SAGA-RG] notes from the Java binding meeting at OGF22
Thilo Kielmann wrote:
Andre's notes pretty much speak for themselves ;-)
Thilo ----- Forwarded message from Andre Merzky <andre@merzky.net> -----
From: Andre Merzky <andre@merzky.net> To: Thilo Kielmann <kielmann@cs.vu.nl> Subject: notes
- job
Q: Daniel: Task<Object> -> Task<?extendsObject> A: aha
Well, I wanted that, but unfortunately:
[javac] /home/ceriel/workspace/Saga/src/org/ogf/saga/job/Job.java:21: unexpected type [javac] found : ? extends java.lang.Object [javac] required: class or interface without bounds [javac] public interface Job extends Task<? extends Object>, Async, AsyncAttributes, Permissions { [javac] ^ [javac] 1 error
Ceriel -- "We've got too much time to waste to stand around here doing things." - Tigger
Andre, The bound in this case is a lowerbound on what the generic is supposed to extend: in this case: java.lang.Object. Andre Merzky wrote:
Ceriel,
What means 'without bounds'?
Thanks, Andre.
Quoting [Ceriel Jacobs] (Feb 27 2008):
From: Ceriel Jacobs <ceriel@cs.vu.nl> To: Thilo Kielmann <kielmann@cs.vu.nl> Cc: saga-rg@ogf.org Subject: Re: [SAGA-RG] notes from the Java binding meeting at OGF22
Thilo Kielmann wrote:
Andre's notes pretty much speak for themselves ;-)
Thilo ----- Forwarded message from Andre Merzky <andre@merzky.net> -----
From: Andre Merzky <andre@merzky.net> To: Thilo Kielmann <kielmann@cs.vu.nl> Subject: notes - job
Q: Daniel: Task<Object> -> Task<?extendsObject> A: aha Well, I wanted that, but unfortunately:
[javac] /home/ceriel/workspace/Saga/src/org/ogf/saga/job/Job.java:21: unexpected type [javac] found : ? extends java.lang.Object [javac] required: class or interface without bounds [javac] public interface Job extends Task<? extends Object>, Async, AsyncAttributes, Permissions { [javac] ^ [javac] 1 error
Ceriel
participants (3)
-
Andre Merzky -
Ceriel Jacobs -
Thilo Kielmann