Proof of Concept of Erlang-style hot-swapping in Ruby

hotswap.rb

$CALLBACK = nil
$i = 0

class HotCode

  def self.dispatcher(&block)
    while(42)
      sleep(0.25)
      block.call
      if($CALLBACK != block)
        block = $CALLBACK
      end
    end
  end
end

$CALLBACK = Proc.new{ puts "old"}
thr = Thread.new{ HotCode.dispatcher &$CALLBACK}
sleep(2)
$CALLBACK = Proc.new{ puts "new"}

thr.join