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Re: Destroying objects [message #38044 is a reply to message #37981]

Mon, 16 February 2004 10:18

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Andy Meigs writes:

> Starting to work on objects as well using Martin Schlutz's mgs_objects base
> class system-- mighty frustrating when 'errors' (probably not of Martin's,
> but of my ignorance in how to use his code) occur several superclasses from
> the class you have written.

Yes, well, one of the things we *have* done right in our
library is implement excellent error handling. The problem
we had originally was cascading error messages. Something
would happen way down deep, and the message would propagate
up the entire object chain. It sounded like one of those
fire alarms you can't turn off. :-(

Very disconcerting to new users of the library.

We figured out a way to indicate that the error was already
"handled" so objects further up the chain could just pass it
silently. Users get one error, and the traceback points to
the right place 99.9% of the time. Note that this is a
different technique from handing the *error* silently, which
is what the iTool library does. Using the latter method, you can
be frustrated for weeks on end, since it takes four or five
times as long to realize you *have* an error than it does
to fix it. :-)

Cheers,

David

P.S. Part of my frustration last week turned out to be--don't
you know--a...uh, programmer error. I've got to get the ol'
Sherlock Holmes manual out again, but I'm pretty sure one of
the first rules is "check your assumptions". :-(

--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Destroying objects By: Michael Wallace on Wed, 11 February 2004 14:26
		Re: Destroying objects By: JD Smith on Tue, 17 February 2004 12:30
		Re: Destroying objects By: David Fanning on Tue, 17 February 2004 13:19
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 14:06
		Re: Destroying objects By: JD Smith on Mon, 16 February 2004 13:11
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 13:22
		Re: Destroying objects By: Michael Wallace on Mon, 16 February 2004 12:46
		Re: Destroying objects By: JD Smith on Mon, 16 February 2004 11:55
		Re: Destroying objects By: David Fanning on Mon, 16 February 2004 10:18
		Re: Destroying objects By: David Fanning on Fri, 18 January 2013 10:23
		Re: Destroying objects By: Helder Marchetto on Fri, 18 January 2013 10:07
		Re: Destroying objects By: David Fanning on Fri, 18 January 2013 09:50
		Re: Destroying objects By: chris_torrence@NOSPAM on Fri, 18 January 2013 09:12

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