exec.rb

# Author:  Emanuele Tozzato (mailto:etozzato@gmail.com)
# 
# = Description
# Execute given block until true for given attempts.
# = Usage
# exec! { gateway.perform_handshake('2897-XSANI-19827') }
module Exec
  
  CONFIG = { 
    :default_attempts => 3, 
    :max_attempts => 10, 
    :err => "attempts number is too high", 
    :sleep => 0.5
  }

  def exec!(attempts=CONFIG[:default_attempts])
    attempts = attempts.to_i
    raise StandardError.new(CONFIG[:err]) if attempts > CONFIG[:max_attempts]
    begin
      1.upto(attempts) do |i|
        result = yield
        return true if result
        sleep(CONFIG[:sleep])
      end
      false
    rescue
      false
    end
  end

end