gistfile1.rb

#tweet

$ irb
irb(main):001:0> require 'drb/drb'
=> true
irb(main):002:0> DRb.start_service
=> #<DRb::DRbServer:...>
irb(main):003:0> ro = DRbObject.new_with_uri('druby://localhost:54321')
=> #<DRb::DRbObject:0...>
irb(main):004:0> ro.notify('tweet')
=> 1
irb(main):005:0> ro.notify('Hello, World')
=> 2

notify.rb

require 'rinda/tuplespace'
require 'drb/drb'

class Notifier
  def initialize
    @ts = Rinda::TupleSpace.new
    @ts.write([:tail, 0])
  end

  def notify(it)
    tuple = @ts.take([:tail, nil])
    tail = tuple[1] + 1
    @ts.write([tail, it])
    @ts.write([:tail, tail])
    tail
  end

  def receive(key)
    @ts.read([key, nil])
  end
end

DRb.start_service('druby://localhost:54321', Notifier.new)
while true
  sleep 1
end

receive.rb

require 'drb/drb'

DRb.start_service
ro = DRbObject.new_with_uri('druby://localhost:54321')

key = 0
while true
  key, obj = ro.receive(key + 1)
  p [key, obj]
  sleep(3)
end