retryする

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def ret(num=0)
  raise StandardError.new("#{num+=1}回目")
rescue
  puts $!.message
  retry if num < 5

  raise "#{num}度は許さん"
end

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def retry_once
  raise StandardError.new("許して")
rescue
  puts $!.message
  retry if @retry.nil?.tap { @retry = false }

  raise "許さん"
end

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> retry_once
許して
許して
Traceback (most recent call last):
....
RuntimeError (許さん)

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module Retryable
  def retries_call(num=3)
    count = 0
    begin
      count += 1
      yield
    rescue
      retry if count < num

      raise $!
    end
  end
end

class Foo
  def foo(ary)
    ary.each do |i|
      puts i
      raise 'abo-n' if i % 2 == 0
    end
    ary.sum
  end
end

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> bar = foo.retries_call do
>   foo.foo([2])
> end
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2
Traceback (most recent call last):
....
RuntimeError (abo-n)

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> bar = foo.retries_call do
>   foo.foo([1,3,5])
> end
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5
=> 9
> bar
=> 9