Sorting out Exceptions at Runtime

different_versions.rb

#! /usr/bin/env ruby

module Stomp
  class Error < StandardError
  end
end

module Jeff
  def self.unknown_error
    if Stomp.const_defined? "Error"
      Stomp::Error
    else
      StandardError
    end
  end
end

def with_stomp
  begin
    yield
  rescue Jeff.unknown_error => e
    puts "Caught Connection Error: #{e}"
  end
end

def raise_standard_error
  raise StandardError, "Stomp 1.1"
end

def raise_stomp_error
  raise Stomp::Error, "Stomp 1.2"
end

begin
  with_stomp do
    raise_stomp_error
  end
rescue => e
  puts "Uncaught Error: #{e.class}"
end
begin
  with_stomp do
    raise_standard_error
  end
rescue => e
  puts "Uncaught Error: #{e.class}"
end