exc/exception_intercept

Here's a neat way to intercept exceptions without rescuing them and rethrowing them (which doesn't work properly on Ruby 1.6).

E.g.:

  class MyException < Exception
    def initialize
      super "Foo!"
    end
  end
  exception_intercept(
    proc {
      raise MyException
    },
    proc { |exc|
      case exc
      when MyException
        puts "Got the exception!"
      else
        puts "UH OH!"
        kill_exception # don't let this exception propogate further
      end
    }
  )

Public Methods

exception_intercept(main_block, rescue_block)

Call main_block. If an exception is thrown, then call rescue_block. The exception will propogate automatically unless kill_exception is called.

Note that the rescue_block will be called when there is any type of exception. Using "rescue Exception" does not catch exceptions that do not inherit from class Exception.

The rescue_block will not be called when throw is used. It will not be called when continuations are used.

kill_exception

class KillException < Exception