Ruby 多次调用远程对象的方法

Question

1. require 'drb'
2. class Counter
3. attr_reader:count
4.   def initialize
5.     @count = 0
6.   end
7.   def increment
8.     @count += 1
9.   end
10. end
11. class TrackedCounter < Counter
12. attr_reader:name
13. attr_reader:createdAt
14. attr_reader:lastAccess
15.   def initialize(name)
16.      super()
17.      @name = name
18.      @createdAt = Time.now
19.      @lastAccess = @createdAt
20.   end
21. end
22. tracked = TrackedCounter.new("Tracked Counter")
23. DRb.start_service("druby://localhost:8888", tracked)
24. DRb.thread.join
26. # accesses the tracked object that has been exported by the server:
28. require 'drb'
29. DRb.start_service
30. tracked = DRbObject.new(nil, "druby://localhost:8888")
31. 5.times do
32.   tracked.increment
33.   puts "The count is #{tracked.count}"
34.   puts "The last access date is #{tracked.lastAccess}"
35. end

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Answer 1

同样没有问题说明？