From: Brian Candler <b.candler@...>
Date: 2010-08-06T17:39:42+09:00
Subject: Re: Abstracting exception handling

Martin Hansen wrote:
> Now, I would like error handling to be invoked, if possible from 
> biopieces.rb, in the case some exception is raised (either by raise or 
> ctrl-c, etc)

What do you want the exception handler to do? Will the program still 
terminate afterwards?

If so, why not just add an at_exit handler?

--- prog1.rb ---
at_exit { puts "Last exception was #{$!.inspect}" if $! }
raise "Boom"

--- prog2.rb ---
at_exit { puts "Last exception was #{$!.inspect}" if $! }
puts "Nothing happened"

--- prog3.rb ---
at_exit { puts "Last exception was #{$!.inspect}" if $! }
begin
  raise "Caught it"
rescue RuntimeError
end
puts "Nothing happened"

--- prog4.rb ---
at_exit { puts "Last exception was #{$!.inspect}" if $! }
begin
  raise "Caught it"
rescue RuntimeError
end
sleep 10
puts "Nothing happened"

Note that both prog2 and prog3 terminate successfully and don't report 
any exception. prog4 reports Interrupt if you terminate with ^C.

Your at_exit code can of course sit in a separate source file that you 
require.
-- 
Posted via http://www.ruby-forum.com/.