Sounds reasonable to me. At a minimum, all of these very specific state exception should inherit from a more general exception in languages that support it.
A mandatory exception hierarchy was declined a long time ago, the argumentation became even part of the DRMAA IDL 1.0 spec: "Language bindings MAY decide to introduce a hierarchical ordering of the DRMAA exceptions through class derivation. In this case it MAY also happen that new exceptions are introduced for behavior aggregation. In this case, those exceptions SHALL be marked as abstract, to prevent them from being thrown."
1. Can we merge JobAlreadySuspendedException, JobNotSuspendedException, JobTerminatedException into one something like CantApplyToCurrentStateExecption (OGSA-BES approach) and state that the error message should bears current job state ?
I might have missed something, but where did you got these exceptions from ? Another point is that your proposal is already reality. The decision was made at the F2F meeting in July 2009: "The former HoldInconsistentStateException, ReleaseInconsistentStateException, ResumeInconsistentStateException, andSuspendInconsistentStateException from DRMAA v1.0 are now expressed as single InconsistentStateException with different meaning per function" I would like to ask everybody to reason ONLY about the DRMAAv2 spec in the wiki. Every other document is (very likely) outdated. Thanks and best regards, Peter.
2. Guaranteeing atomicity (concerning operation that comes from outside) in DRMAA is almost impossible for the DRMS i know, as usually there is no "lock on job" operation available in public API.
Cheers,
On 1 March 2010 15:27, Andre Merzky<andre@merzky.net> wrote:
Hi Dan,
Quoting [Daniel Templeton] (Mar 01 2010):
There is, however, no need to make the exception explicitly optional. Exceptions are by definition optional.
This may be true in this case, but in general I expect exceptions to be guaranteed on specific circumstances. For example, I would expect that a suspend() on an invalid jobid will *always* cause an exception (mandatory), not only sometimes (optional).
Best, Andre.
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