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From: "REH" <spamjunk@stny.rr.com>
Newsgroups: comp.lang.ada
Subject: Re: exception propagation for a distributed call
Date: 7 Mar 2006 07:19:35 -0800
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Date: 2006-03-07T07:19:35-08:00
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REH wrote:
> I need to implement something that has probably already been done
> hundreds of times.  I have to implement some distributed calls (i.e.,
> across sockets, arinc ports, separate memory partitions, etc.).  I need
> to trap any exception that may occur, and re-raise it for the caller,
> like CORBA does (though I cannot use CORBA, RPC, etc.).  I also do not
> want to replicate a lot of code in each exception block.  What I have
> so far is to create a procedure that will take an exception occurence
> as a parameter and call it in each exception block at a "when others
> =>" arm.  The function returns an enumeration value for the exception
> which can be marshalled across and re-raised via a case statement.
> What I cannot figure out is how to convert the occurrence in a portable
> way so I do not have to use compiler-specific features.  I know I can
> convert it to an exception_id, but how do I determine which exception
> the id is for?  Is there a way to get the id of an exception without
> raising it?  Or, is there a better way
>
> Thanks,
>
> REH

Ah, I should have dug deeper before asking.  I just discovered I can
do: E'Identity on an exception.

Thanks.

REH