exc/rollback

class Rollback < Object

A helper class for rolling back changes made when an exception occurs.

Public Methods

debug

debug=

initialize(a=Array.new)

Create a new Rollback object. You should generally not have to do this directly; use Rollback::rollback() instead.

undo(x)

Specify that the passed proc or method should be called when an exception occurs. All undo actions will be called in the reverse order in which they were created.

self.rollback(*args, &block)

Run the passed block, and call the given undo() actions in reverse order if an exception occurs. The exception will be properly propogated to the caller.

E.g.:

  Rollback::rollback do |rb, *args|
    rb.undo(Proc.new { puts "1" })
    rb.undo(Proc.new { puts "2" })
    rb.undo(Proc.new { puts "3" })
    raise RuntimeError
  end

Requires