Re: exception handling

The classification of errors is a good idea. In MRROC++ we distinguish 3
types of errors:
- non-fatal errors (computational errors, e.g. associated with kinematic
computations - violation of joint limits)
- fatal errors (malfunction of a robot, e.g. someone cuts off power)
- system errors (degradation of distributed control system capabilities,
e.g. someone turns off one of the nodes of the computer network)
Perhaps a finer granularity is needed.
Cezary


----- Original Message -----
From: "Jorge Cabrera Gámez" <[email protected]>
To: "Herman Bruyninckx" <[email protected]>
Sent: Tuesday, March 05, 2002 6:11 PM
Subject: Re: [Orocos] exception handling


> Hi,
>
> Herman Bruyninckx wrote:
>
> > On Tue, 5 Mar 2002, Cezary Zielinski wrote:
> >
> > > Exception handling should be synonymous to handling error situations.
We
> > > should not try to use that in situations that are not disastrous to
the
> > > system. If a disaster occurs the time restrictions are not valid any
more,
> > > so the indeterminism that you are speaking about is no longer an
issue. I
> > > use exception handling extensively in MRROC++ and don't have problems
with
> > > that.
> >
> > There are different levels of error situations! Some are indeed a
> > `disaster', but others reflect nothing more than a change in the
> > currently valid assumptions in the robot control. The latter ones can
> > and should be dealt with in real-time, in some cases.
> >
> > The terminology `exception' is indeed a bit overloaded :-) I think
> > Anders used it in the C++ interpretation of the word, which is the one
> > I also use in the previous paragraph.
>
> I agree with Herman. I think we need to define a taxonomy or typology of
> "errors", ranging from catastrophic failures to simple "warnings". I think
we
> don't need to specify all possible errors, but the general clases. Then, I
will
> try to enforce the adoption of an uniform handling method for each error
> typology that should be part of the Orocos' component specification.
>
> Regards.
>
> Jorge
>
> ===========================================================
> Jorge Cabrera Gamez
> Facultad de Informatica
> Universidad de Las Palmas de Gran Canaria
> Campus Universitario de Tafira
> 35017 Las Palmas de Gran Canaria.
> SPAIN
> Tel: +34 928 458758
> Fax: +34 928 458711
> E-mail: [email protected]
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