retry.rb

LIMIT = {}
def limit n
  key = [caller,Thread.current]
  LIMIT[key] ||= n
  LIMIT[key] -= 1
  n = LIMIT[key]
  if n > 0
    n
  else
    LIMIT.delete key
    nil
  end
end

class CustomError < StandardError;end
begin
  raise CustomError, "nyan" if rand() < 0.95
  p "wan!"
rescue CustomError => e
  p e
  retry if limit 10
end

使えません