晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby27/share/ruby/drb/
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Current File : //opt/alt/ruby27/share/ruby/drb/extservm.rb
# frozen_string_literal: false
=begin
 external service manager
        Copyright (c) 2000 Masatoshi SEKI
=end

require_relative 'drb'
require 'monitor'

module DRb
  class ExtServManager
    include DRbUndumped
    include MonitorMixin

    @@command = {}

    def self.command
      @@command
    end

    def self.command=(cmd)
      @@command = cmd
    end

    def initialize
      super()
      @cond = new_cond
      @servers = {}
      @waiting = []
      @queue = Thread::Queue.new
      @thread = invoke_thread
      @uri = nil
    end
    attr_accessor :uri

    def service(name)
      synchronize do
        while true
          server = @servers[name]
          return server if server && server.alive? # server may be `false'
          invoke_service(name)
          @cond.wait
        end
      end
    end

    def regist(name, ro)
      synchronize do
        @servers[name] = ro
        @cond.signal
      end
      self
    end

    def unregist(name)
      synchronize do
        @servers.delete(name)
      end
    end

    private
    def invoke_thread
      Thread.new do
        while name = @queue.pop
          invoke_service_command(name, @@command[name])
        end
      end
    end

    def invoke_service(name)
      @queue.push(name)
    end

    def invoke_service_command(name, command)
      raise "invalid command. name: #{name}" unless command
      synchronize do
        return if @servers.include?(name)
        @servers[name] = false
      end
      uri = @uri || DRb.uri
      if command.respond_to? :to_ary
        command = command.to_ary + [uri, name]
        pid = spawn(*command)
      else
        pid = spawn("#{command} #{uri} #{name}")
      end
      th = Process.detach(pid)
      th[:drb_service] = name
      th
    end
  end
end