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Newsgroups: comp.lang.ada
Subject: Re: Structured exception information
From: Georg Bauhaus <bauhaus@arcor.de>
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Date: Tue, 16 Jan 2007 15:45:52 +0100
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Date: 2007-01-16T15:43:46+01:00
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On Tue, 2007-01-16 at 15:33 +0100, Maciej Sobczak wrote:

> Imagine a constructor function that calls a database or a script engine 
> with the query/script provided as a parameter. Some error can result and 
> I want to raise an exception. The handler might benefit (even if for the 
> purpose of presenting a nice error pop-up message) from:
> 
> - error code
> - error message
> - line number
> - character position
> - hint from the engine
> - timestamp from within the engine
> - ...

This looks like a rich and controlled message passing to me.
Maybe an alternative design will handle the DB exceptions
locally, and then have two task rendevouz: a DB_Service
task, and a UI task. The latter will accept
and entry called "throw" with a parameter of a type
that reflects the list above. :-)