#!/usr/bin/env ruby -w

require "open3"
require "drb/drb"
require "thread"

class CommandRunner
  def initialize(command)
    @stdin, @stdout, @stderr = Open3.popen3(command)
  end

  def send_input(input)
    @stdin.puts(input)
  end

  def get_output
    @stdout.gets
  end

  def get_errors
    @stderr.gets
  end
end

DRb.start_service "druby://:2001", CommandRunner.new('/usr/local/bin/R --no-save --slave')
puts DRb.uri
DRb.thread.join

#!/usr/bin/env ruby -w

require 'drb/drb'

DRb.start_service
ro = DRbObject.new(nil, "druby://#{`uname -n`.chomp}:2001")
ro.send_input("x=5")
ro.send_input("print(x)")
puts ro.get_output

##

Run the test_server.rb, then run test_client.rb in another terminal