Ruby 调用远程对象

require 'drb'
class Counter
attr_reader:count
  def initialize
    @count = 0

  end
  def increment
    @count += 1
  end
end
counter = Counter.new
DRb.start_service("druby://localhost:8888", counter)
DRb.thread.join

# accesses the Counter object that has been exported by the server:

require 'drb'
DRb.start_service
counter = DRbObject.new(nil, "druby://localhost:8888")
5.times do
  counter.increment
  puts counter.count
end